JP7564456B2 - Method for selecting additional ventilation device, method for selecting additional ventilation device and air conditioning device, and air conditioning ventilation system - Google Patents

Description

This relates to a method for selecting an additional ventilation device, a method for selecting an additional ventilation device and an air conditioning device, and an air conditioning and ventilation system.

Conventionally, ventilation devices that exhaust indoor air to the outside and supply outdoor air to the inside of a room have been widely used (see, for example, Patent Document 1 (JP Patent Publication No. 2005-300112)).

Many existing buildings have ventilation systems installed and provide a certain degree of ventilation.

Recently, however, there has been a demand to increase ventilation volume as one of the measures to prevent infections caused by pathogens such as viruses and bacteria (hereafter referred to as pathogen infections).

However, if you replace an existing ventilation system, the cost of the equipment and installation will be high.

The first aspect of the method for selecting an additional ventilation device is a method for selecting an additional ventilation device when a different ventilation device is newly installed as an additional ventilation device for an indoor space in which an existing first ventilation device is installed. The existing first ventilation device has a ventilation volume per hour as the first ventilation volume. The first aspect of the method for selecting an additional ventilation device includes a first step, a second step, and a third step. In the first step, the second ventilation volume is calculated based on the size of the indoor space. The size of the indoor space can be, for example, the floor area of the indoor space, the volume of the indoor space, or the number of people accommodated in the indoor space. The second ventilation volume is the ventilation volume per hour required as a measure against pathogen infection. In the second step, the difference between the second ventilation volume and the first ventilation volume is calculated as the additional ventilation volume. In the third step, a ventilation device capable of ventilating the additional ventilation volume is selected as the additional ventilation device.

Here, the additional ventilation equipment is selected based on the unprecedented and excellent idea of using the first ventilation volume of the existing first ventilation equipment as is, and supplementing the insufficient ventilation volume (additional ventilation volume) with the additional ventilation equipment. This realizes the second ventilation volume required as a measure against pathogen infection, while keeping costs down.

The second aspect of the selection method of an additional ventilation device and an air conditioning device is a method of selecting an additional ventilation device and an air conditioning device, which selects an additional ventilation device by the selection method of the first aspect, and further selects an air conditioning device. The air conditioning device is a device that conditions an indoor space. The second aspect of the selection method of an additional ventilation device and an air conditioning device includes a fourth step and a fifth step in addition to the first step, the second step, and the third step. In the fourth step, the sum of the first air conditioning load, the second air conditioning load, and the third air conditioning load is calculated as a total air conditioning load. The first air conditioning load is determined based on the size of the indoor space. The second air conditioning load is an air conditioning load caused by ventilation by the existing first ventilation device. The third air conditioning load is an air conditioning load caused by ventilation by the additional ventilation device selected in the third step. In the fifth step, an air conditioning device having an air conditioning capacity capable of processing the total air conditioning load is selected from a plurality of candidate air conditioning devices having different air conditioning capacities.

When an additional ventilation device is installed in an indoor space in addition to an existing first ventilation device, it is expected that the ventilation by the additional ventilation device will increase the air conditioning load in the indoor space. If this is not taken into consideration, the thermal environment of the indoor space may deteriorate. In light of this, the second aspect of the selection method for an additional ventilation device and an air conditioning device makes it possible to select an air conditioning device that is capable of handling the total air conditioning load, including the air conditioning load generated by the ventilation by the additional ventilation device.

The selection method for an additional ventilation device and an air conditioner from a third perspective is the selection method from the second perspective, and in the third step, a ventilation device having a heat exchange unit is selected as the additional ventilation device. The heat exchange unit exchanges heat between the outside air that is supplied to the indoor space and the return air that is exhausted from the indoor space. In addition, in the fourth step, a third air conditioning load is calculated taking into account the amount of heat exchange in the heat exchange unit of the selected additional ventilation device.

Here, a ventilation device having a heat exchange section that exchanges heat between the supply air and the exhaust air is selected as the additional ventilation device. This makes it possible to minimize the deterioration of the thermal environment in the indoor space caused by ventilation by the additional ventilation device. Furthermore, because the third air conditioning load is calculated taking into account the amount of heat exchanged in the heat exchange section, the total air conditioning load is not overcalculated. This makes it possible to correctly recognize the required air conditioning capacity of the air conditioner and select an air conditioner that is neither excessive nor insufficient.

The selection method of the additional ventilation device and the air conditioning device of the fourth aspect is the selection method of the second or third aspect, and further includes a sixth step and a seventh step. In the sixth step, it is determined whether the air volume at maximum ventilation of the additional ventilation device selected in the third step is 30% or less of the rated air volume of the air conditioning device selected in the fifth step. In the seventh step, if it is determined in the sixth step that the air volume at maximum ventilation of the additional ventilation device exceeds 30% of the rated air volume of the air conditioning device, the selection of the additional ventilation device and the air conditioning device is reviewed.

If the air volume at maximum ventilation of the additional ventilation device exceeds 30% of the rated air volume of the air conditioner, even if the total air conditioning load can be handled by the air conditioning capacity of the air conditioner, the operating efficiency of the air conditioner may deteriorate and running costs may become high. In view of this, the selection method of the additional ventilation device and air conditioner of the fourth aspect further includes the sixth and seventh steps, and the selection of the additional ventilation device and air conditioner is reviewed. This makes it possible, for example, to select an air conditioner with a higher rated air volume or air conditioning capacity, thereby reducing the running costs of air conditioning and ventilation.

The selection method of the additional ventilation device and the air conditioning device of the fifth aspect is any of the selection methods of the second aspect to the fourth aspect, in which in the third step, the additional ventilation device is selected from among a plurality of candidate ventilation devices having different maximum ventilation volumes. Also, the number of the candidate air conditioning devices in the fifth step is greater than the number of the candidate ventilation devices in the third step.

Here, by preparing many candidate air conditioning devices, it becomes possible to select a more appropriate air conditioning device according to the selected additional ventilation device. This makes it possible to reduce the cost of the device and the cost of installing the device.

The air conditioning and ventilation system of the sixth aspect is an air conditioning and ventilation system to be installed in an indoor space having a floor area of 70 m2 ^{or more} and 95 ^m2 or less and having an existing first ventilation device with a first ventilation volume per hour, and comprising an air conditioner with a rated cooling capacity of approximately 12.5 kW and a ventilation device with a maximum ventilation volume of 250 ^m3 /h.

If this air conditioning and ventilation system is installed in an indoor space in an existing building, with the above-mentioned floor area where the first ventilation volume is ensured, it is possible to obtain the ventilation volume required to prevent pathogen infection, and the total air conditioning load of the indoor space, including the air conditioning load due to the increased ventilation volume, can be handled by the air conditioner.

The air conditioning and ventilation system of the seventh aspect is an air conditioning and ventilation system to be installed in an indoor space having a floor area of 40 m2 ^{or more} and 60 ^m2 or less, and having an existing first ventilation device with a first ventilation volume per hour, and comprising an air conditioner with a rated cooling capacity of approximately 7.1 kW, and a ventilation device with a maximum ventilation volume of 150 ^m3 /h.

If this air conditioning and ventilation system is installed in an indoor space in an existing building, with the above-mentioned floor area where the first ventilation volume is ensured, it is possible to obtain the ventilation volume required to prevent pathogen infection, and the total air conditioning load of the indoor space, including the air conditioning load due to the increased ventilation volume, can be handled by the air conditioner.

The air conditioning and ventilation system of the eighth aspect is the air conditioning and ventilation system of the sixth or seventh aspect, in which the air conditioner has an air intake port. The air intake port receives supply air from outside the indoor space. The ventilation device has an air intake fan. The air intake fan is a fan for sending outside air to the air conditioner as supply air. The air conditioning and ventilation system of the eighth aspect further includes an air intake path forming member. The air intake path forming member is connected to the ventilation device and the air conditioner to form an air intake path. The air intake path is an air flow path that guides the supply air from the ventilation device to the air intake port of the air conditioner.

This air conditioning ventilation system packages the ventilation device, air conditioner, and air supply path forming components, so introduction costs, including installation costs, are lower than when connecting the ventilation device and air conditioner using ducts and other parts procured locally. In addition, because the air supply from the ventilation device is received by the air conditioner, it is possible to change the temperature of the supply air in the air conditioner before supplying it to the indoor space.

The air conditioning and ventilation system of a ninth aspect is the air conditioning and ventilation system of the eighth aspect, wherein the ventilation device further has a casing, an exhaust fan, and a heat exchanger. The casing houses the supply air fan and the exhaust fan. The exhaust fan is a fan for sending air in the indoor space outside the indoor space as exhaust air. The heat exchanger exchanges heat between the outside air and the exhaust air. The casing is formed with a first opening, a second opening, a third opening, and a fourth opening. The third opening is an opening for taking in outside air. An air supply path forming member is connected to the fourth opening. The first opening is an opening for taking in air in the indoor space as return air. The second opening is an opening for sending the return air outside the indoor space as exhaust air. The air conditioning and ventilation system of the ninth aspect further includes a pressure adjustment unit. The pressure adjustment unit adjusts the air pressure so that the difference between the pressure of the return air flowing from the first opening to the second opening in the ventilation device and the pressure of the outside air flowing from the third opening to the fourth opening in the ventilation device is small.

When the exhaust fan operates, air from the indoor space is taken into the casing through the first opening as return air, and is sent out of the indoor space through the second opening as exhaust air. When the supply fan operates, outside air is taken into the casing through the third opening, flows from the third opening to the fourth opening, and supply air is sent from the fourth opening through the air supply passage to the air conditioner. The return air taken into the casing through the first opening and the outside air taken into the casing through the third opening are heat exchanged in the heat exchanger. This makes it possible to suppress an increase in the air conditioning load in the indoor space due to ventilation.

In addition, in the air conditioning and ventilation system of the ninth aspect, a pressure adjustment unit is provided so that the difference in pressure between the outside air and the return air that are exchanged with each other is reduced. This prevents problems such as the outside air and the return air mixing in a heat exchanger, etc.

The air conditioning and ventilation system of the tenth aspect is the air conditioning and ventilation system according to any one of the sixth aspect to the ninth aspect, further comprising a remote controller that controls the air conditioning device and the ventilation device.

Here, for example, it will be possible to use a remote controller to link the operation and stopping of the air conditioning device and the ventilation device, and to control the ventilation device so that it does not ventilate when the air conditioning device is not operating.

FIG. 1 is a state diagram of a building in which a first ventilation device and an air conditioning ventilation system are installed. FIG. 2 is a diagram showing the state of the building before the second ventilation device is added. 2 is an oblique view of an air conditioning indoor unit, an air supply intake member attached to the air conditioning indoor unit, and an air supply duct for assembly. FIG. FIG. 2 is a control block diagram of the air conditioning and ventilation system. FIG. 11 is a diagram showing the ventilation state of a room by a first ventilation device before a second ventilation device is installed. FIG. 11 is a diagram showing the ventilation state in a room when a second ventilation device is not installed and the ventilation volume is increased by opening a window. FIG. 11 is a diagram showing the ventilation state in a room when a second ventilation device is additionally installed. 13 is a table showing various numerical values for combinations of candidates for second ventilation devices and candidates for air conditioning indoor units.

1A shows the installation state of a first ventilator 10 and an air conditioning ventilation system 100 in a building H. The first ventilator 10 and the air conditioning ventilation system 100 are installed for one predetermined indoor space SI in the building H. The air conditioning ventilation system 100 mainly comprises a second ventilator 20, an air conditioning indoor unit 30, ducts 21-24, and a remote control 90.

The first ventilation device 10 is a ventilation device that was already installed in the indoor space SI before the second ventilation device 20 was installed.

The air conditioning indoor unit 30 of the air conditioning ventilation system 100 is also equipment that was already installed in the indoor space SI before the second ventilation device 20 was installed.

Figure 1B shows the state of building H before the second ventilation device 20 is installed.

The second ventilation device 20 and ducts 21 to 24 of the air conditioning ventilation system 100 are installed after the first ventilation device 10 and the air conditioning indoor unit 30 are already installed in the indoor space SI.

In this embodiment, the first ventilation device 10 and the air conditioning indoor unit 30 shown in Figures 1A and 1B are assumed to have already been installed, while the second ventilation device 20 and ducts 21 to 24 shown in Figure 1A are assumed to be in the design stage for installation.

(2) Details of the First Ventilator The first ventilation device 10 is a ventilation fan having a propeller fan or a ventilation device having a sirocco fan. The first ventilation device 10 shown in Fig. 1A and Fig. 1B draws in indoor air from the indoor space SI and exhausts it to the outside of the building H (outdoor space SO). The intake port of the first ventilation device 10 is connected to a first return air vent 16 provided on the ceiling of the indoor space SI. The blower port of the first ventilation device 10 is connected to a first exhaust vent 18 opened in the outer wall of the building H. The first ventilation device 10 has a ventilation volume of, for example, 500 ^m3 /h.

(3) Details of the air conditioning indoor unit The air conditioning indoor unit 30 is a device that constitutes an air conditioner together with an air conditioning outdoor unit (not shown) installed on the roof or outside of the building H. The air conditioner is a device that cools and heats an indoor space SI by a vapor compression refrigeration cycle. As shown in FIG. 1A or FIG. 1B, the air conditioning indoor unit 30 has a heat exchanger 37 that constitutes a refrigeration cycle, an indoor fan 35 for sending indoor air to the heat exchanger 37 and returning it to the indoor space SI, and the like. The casing of the air conditioning indoor unit 30 is rectangular in plan view, with an intake port 31 formed in the center of the bottom surface, and an outlet port 32 formed along each of the four sides of the bottom surface. Indoor air is sucked in from the intake port 31 (see arrow Ain in FIG. 1A), and conditioned air is returned to the indoor space SI from the outlet port 32 (see arrow Aout in FIG. 1A).

The air conditioning indoor unit 30 shown in FIG. 1A is equipped with an air intake member 30a shown in FIG. 2 as an optional device. The air intake member 30a is a member that forms a flow path through which air flows. Air that enters through the inlet 33 of the air intake member 30a flows out near the suction port 31 of the casing of the air conditioning indoor unit 30.

(4) Details of the second ventilation device and duct which, together with the air conditioning indoor unit, constitute the air conditioning ventilation system The second ventilation device 20 is placed in the space SC above the ceiling of the indoor space SI of the building H, and while ventilating the indoor space SI, heat exchange is performed between the outside air OA, which becomes the supply air SA, and the return air RA, which becomes the exhaust air EA.

Ducts 21 to 24 are return air duct 21, exhaust air duct 22, outside air intake duct 23, and supply air duct 24.

The second ventilation device 20 has a casing 50, an intake fan 26, an exhaust fan 28, a heat exchange element 40 having a substantially rectangular prism shape, and a ventilation control unit 70.

The casing 50 houses the heat exchange element 40, the intake fan 26, the exhaust fan 28, etc. The casing 50 also has a first opening 51 to which the return air duct 21 is connected, a second opening 52 to which the exhaust duct 22 is connected, a third opening 53 to which the outside air intake duct 23 is connected, and a fourth opening 54 to which the intake duct 24 is connected.

Inside the casing 50, there are a first space 51a between the first opening 51 and the heat exchange element 40, a second space 52a between the second opening 52 and the heat exchange element 40, a third space 53a between the third opening 53 and the heat exchange element 40, and a fourth space 54a between the fourth opening 54 and the heat exchange element 40.

The supply air fan 26 is disposed in the fourth space 54a and has a supply air fan motor 26m. The exhaust fan 28 is disposed in the second space 52a and has an exhaust fan motor 28m.

The return air duct 21 connects the first opening 51 of the second ventilation device 20 to a second return air port 81 provided in the ceiling of the indoor space SI, forming a return air passage 21a through which the return air RA flows.

The exhaust duct 22 connects the second opening 52 of the second ventilation device 20 to a second exhaust port 82 opened in the exterior wall of the building H, forming an exhaust path 22a through which the exhaust air EA flows.

The outside air intake duct 23 connects the third opening 53 of the second ventilation device 20 to an outside air intake port 83 opened in the exterior wall of the building H, forming an outside air intake path 23a through which the outside air OA flows.

The supply air duct 24 connects the fourth opening 54 of the second ventilation device 20 to the inlet 33 of the supply air intake member 30a that is additionally installed in the air conditioning indoor unit 30, forming an air supply passage 24a through which the supply air SA flows. The supply air duct 24 branches into two and connects to the two inlets 33. By branching into two, the air passage area can be increased and the pressure loss in the supply air duct can be reduced.

As shown in FIG. 3, the ventilation control unit 70 is connected to the supply fan motor 26m, the exhaust fan motor 28m, the remote control 90, and the like. The ventilation control unit 70 is realized by a computer. The ventilation control unit 70 includes a control and arithmetic device and a storage device. The control and arithmetic device can be a processor such as a CPU or a GPU. The control and arithmetic device reads out a program stored in the storage device and performs predetermined image processing and arithmetic processing according to the program. Furthermore, the control and arithmetic device can write the results of calculations to the storage device and read out information stored in the storage device according to the program. In response to commands from the remote control 90, which will be described later, the ventilation control unit 70 turns the supply fan 26 and the exhaust fan 28 on and off.

Although not shown or explained here, an outside air temperature sensor and an indoor temperature sensor can be connected to the ventilation control unit 70, and the sensor values can be used for control.

(5) Details of the Remote Control The remote control 90 is used by a user in the indoor space SI to operate various settings for the air conditioning indoor unit 30 and the second ventilation device 20. Like the ventilation control unit 70, the remote control 90 is also realized by a computer.

The remote control 90, ventilation control unit 70, and the control unit of the air conditioning indoor unit 30 (not shown) are connected via communication lines.

(6) Details of ventilation by the air conditioning ventilation system The remote control 90 operates the second ventilation device 20 when the indoor fan 35 of the air conditioning indoor unit 30 is operating. In other words, when it is necessary to operate the second ventilation device 20, the remote control 90 also operates the air conditioning indoor unit 30. When the supply air fan 26 and the exhaust fan 28 of the second ventilation device 20 are operated, the outside air OA of the outdoor space SO reaches the heat exchange element 40 from the outside air introduction path 23a, and the air that has passed through the heat exchange element 40 passes through the supply air fan 26 and is supplied to the indoor space SI as fresh supply air SA. The indoor air of the indoor space SI reaches the heat exchange element 40 as return air RA through the return air path 21a, and the air that has passed through the heat exchange element 40 passes through the exhaust fan 28 and is discharged to the outdoor space SO as exhaust air EA.

In the heat exchange element 40, heat is exchanged between the outside air OA and the return air RA, suppressing an increase in the air conditioning load due to ventilation by the second ventilation device 20.

(7) Method for selecting a second ventilation device to be additionally installed to increase the ventilation volume of an indoor space, and method for selecting an air conditioning indoor unit As shown in FIG. 1B, it is assumed that it is required to increase the ventilation volume as one of the measures against infection by pathogens such as viruses and bacteria for an indoor space SI of a building H in which a first ventilation device 10 and an air conditioning indoor unit 30 are already installed. For example, it is assumed that the ventilation volume is designed to be 20 m ³ /h per person and the ventilation volume of the first ventilation device 10 is determined, but a ventilation volume of 10 m ³ /h is required in total, for a total of 30 m ³ /h. In other words, it is required to increase the current ventilation volume by 1.5 times. In that case, the second ventilation device 20 to be additionally installed is selected by the following steps.

(7-1) Method for selecting the second ventilation device First, in the first step, the second ventilation volume required for the second ventilation device 20 to be additionally installed is calculated based on the size of the indoor space SI. In this embodiment, the first step includes a step of calculating the maximum number of people entering the indoor space SI, and a step of calculating the ventilation volume required in the indoor space SI from the maximum number of people. Specifically, the ventilation volume required in the indoor space SI is a value obtained by dividing the floor area (m ² ) of the indoor space SI by the exclusive area (m ² ) per person determined by the use of the indoor space SI (room) (general store, office, etc.), and multiplying the value by the ventilation volume per hour (m ³ /h) required per person. The exclusive area (m ² ) per person determined by the use of the indoor space SI is determined to be, for example, 3 m ² , 5 m ² , etc. depending on the use. The required ventilation volume may be calculated using the volume (m ³ ) of the indoor space SI or the required ventilation frequency of the room.

The first ventilation rate (m ³ /h) is the ventilation rate required for the indoor space SI based on, for example, the amount of carbon dioxide emitted by a person. The second ventilation rate (m ³ /h) is the ventilation rate per hour required for the indoor space SI as a measure against pathogen infection. Pathogens against which infection measures are taken include, for example, viruses or bacteria such as influenza virus, norovirus, coronavirus, and tuberculosis bacillus. The second ventilation rate (m ³ /h) is a value greater than the first ventilation rate (m ³ /h).

Next, in the second step, the difference between the second ventilation rate and the first ventilation rate is calculated as the additional ventilation rate ( ^m3 /h). The first ventilation rate ( ^m3 /h) is the ventilation rate of the first ventilation device 10 already installed in the indoor space SI.

Next, in the third step, a ventilation device capable of providing the additional ventilation volume is selected as the second ventilation device 20 to be added. In the third step, the second ventilation device 20 is selected from the candidate ventilation devices V1 to V6 shown in (7-2) below.

(7-2) Ventilation device candidates V1 to V6
Candidates for ventilation equipment are:
Ventilation device V1 with a ventilation volume of 150 ^m3 /h;
Ventilation device V2 with a ventilation volume of 250 ^m3 /h;
Ventilation device V3 with a ventilation volume of 350 ^m3 /h;
Ventilation device V4 with a ventilation volume of 500 ^m3 /h;
A ventilation device V5 with a ventilation volume of 650 ^m3 /h, and
Ventilation device V6 with a ventilation volume of 800 ^m3 /h;
It is.

(7-3) Method for selecting an air conditioning indoor unit After the selection of the second ventilation device 20 in the third step is completed, the process proceeds to the fourth step. In the fourth step, the sum of the first air conditioning load, the second air conditioning load, and the third air conditioning load is calculated as the total air conditioning load. The first air conditioning load is an air conditioning load determined based on the size of the indoor space SI, and is calculated by summing the heat load of the people and equipment in the room, the solar heat entering through the windows and walls, the heat load based on the inside and outside temperature difference, etc. Depending on the purpose (general store, office, etc.) of the indoor space SI (room) of the building H, the air conditioning load (first air conditioning load) for cooling and heating per unit floor area is known. The second air conditioning load is an air conditioning load generated by ventilation by the existing first ventilation device 10. When ventilation is performed, outside air is taken into the indoor space SI through ducts and gaps in the doors, and a load is generated to keep the outside air at the temperature and humidity of the room. This outside air load is the second air conditioning load caused by ventilation. The third air conditioning load is the air conditioning load caused by ventilation of the second ventilation device 20 selected in the third step.

In addition, in the fourth step, the third air conditioning load is calculated taking into account the amount of heat exchanged between the outside air OA and the return air RA in the heat exchange element 40 of the second ventilation device 20. The heat exchange element 40 is provided to recover all the heat (sensible heat and latent heat) of the air conditioning energy lost through ventilation, and in the fourth step, the amount of heat recovered is taken into account.

In the fifth step, an air conditioning indoor unit 30 with an air conditioning capacity capable of processing the total air conditioning load is selected from multiple air conditioning indoor unit candidates with different air conditioning capacities. Here, the air conditioning indoor unit 30 is selected from the air conditioning indoor unit candidates A1 to A9 shown in (7-4) below.

(7-4) Air conditioning indoor unit candidates A1 to A9
The candidates for the indoor air conditioning unit for the indoor space SI, which is used for a general store, are as follows:
Air conditioning indoor unit A1, 1.5 horsepower (3.6 kW), suitable for floor space of 22-25 ^m2 ;
Air conditioning indoor unit A2, 1.8 horsepower (4.0 kW), suitable for floor space of 25-28 ^m2 ;
A3 2 horsepower (4.5 kW) air conditioning indoor unit, suitable for floor space of 28-31 ^m2 ;
A4 air conditioning indoor unit with 2.3 horsepower (5.0 kW), suitable for floor space of 31-35 ^m2 ;
A5 air conditioning indoor unit with 2.5 horsepower (5.6 kW), suitable for floor space of 35-39 ^m2 ;
A6 3 horsepower (7.1 kW) air conditioning indoor unit, suitable for floor space of 44-50 ^m2 ;
A7 4 horsepower (10.0 kW) air conditioning indoor unit, suitable for floor space of 62-70 ^m2 ;
A8 5 HP (12.5 kW) air conditioning indoor unit, suitable for a floor area of 78-88 ^m2 ; and
A9 6 horsepower (14.0 kW) air conditioning indoor unit, suitable for floor space of 89-100 ^m2 ;
The number of these air conditioning indoor unit candidates A1 to A9 is greater than the number of the above-mentioned ventilation device candidates V1 to V6.

(7-5) Review of Selection of Second Ventilator and Air Conditioning Indoor Unit In the sixth step, it is determined whether the air volume at maximum ventilation volume of the second ventilation device 20 selected in the third step is 30% or less of the rated air volume of the air conditioning indoor unit 30 selected in the fifth step.

Next, in the seventh step, if it is determined in the sixth step that the air volume at the maximum ventilation volume of the second ventilation device 20 exceeds 30% of the rated air volume of the air conditioning indoor unit 30, the selection of the second ventilation device and the air conditioning indoor unit is reviewed. In reviewing the selection, a new air conditioning indoor unit 30 is selected from the candidates for the air conditioning indoor unit with a larger rated air volume, or a new second ventilation device 20 is selected from the candidates for the ventilation device with a smaller maximum ventilation volume.

(7-6) Specific Examples of Selection Next, with reference to Figures 4A to 4C, a specific example of selection of the second ventilation device 20 when additionally installing a second ventilation device 20 to increase the ventilation volume in an indoor space SI of a building H in which a first ventilation device 10 is already installed will be described.

As shown in Fig. 4A, for example, a 5 horsepower (5 HP) air conditioning indoor unit 30 and a first ventilation device 10 with a ventilation volume of 500 ^m3 /h are installed in an indoor space SI of a store. The exclusive area ( ^m2 ) per person determined by the use of the indoor space SI is 3 ^m2 for a general store. If a store with a floor area of the indoor space SI of 75 ^m2 and a capacity of 25 people has previously designed the ventilation volume at 20 ^m3 /h per person, the first ventilation device 10 with a ventilation volume of 500 ^m3 /h is installed. In a general store, the 12.5 kW air conditioning capacity of the 5 HP air conditioning indoor unit 30 can air condition a room with a floor area of 83 ^m3 . On the other hand, in the case of the current ventilation volume of 500 ^m3 /h, the air conditioning capacity required for the indoor space SI of a general store with a floor area of 75 ^m2 is 11.3 kW. Therefore, for the floor area of the current indoor space SI of 75 ^m2 , the 5 horsepower air conditioning indoor unit 30 has a surplus capacity of about 10%.

If the store wants to increase the current ventilation volume (20 ^m3 /h per person) to ensure a total ventilation volume of 30 ^m3 /h (per person) for the indoor space SI as a measure to prevent pathogen infection, opening the windows for ventilation is a simple method that can be suggested.

When ventilation is performed by opening the windows, as shown in FIG. 4B, it is necessary to open the windows and take in an additional 250 m ³ /h of outside air into the indoor space SI. However, opening the windows causes problems such as increased noise, the intrusion of insects into the indoor space SI, and the appearance of temperature unevenness in the indoor space SI, which hinders the comfort of customers in the store. In addition, as an increase in the air conditioning load due to the introduction of outside air, for example, when the outside air temperature is 35° C. and the indoor temperature is 27° C., the outside air load increases by 1.5 kW, and an air conditioning capacity of 12.8 kW (= 11.3 kW + 1.5 kW) is required for the floor area of the indoor space SI of 75 m ^2. In contrast, the air conditioning capacity (12.5 kW) of the existing 5 horsepower air conditioning indoor unit 30 is insufficient, so a store that performs ventilation by opening the windows must remove the 5 horsepower air conditioning indoor unit 30 and install a new 6 horsepower (14.0 kW) air conditioning indoor unit.

In contrast, if the selection methods shown in (7-1) to (7-5) above are adopted as a way to ensure a total ventilation volume of 30 ^m3 /h for the indoor space SI, it is possible to ensure the ventilation volume of the indoor space SI and handle the air conditioning load while keeping initial costs and running costs down.

Using the above selection method, first in step 1, the second ventilation volume required for the indoor space SI as a measure against pathogen infection is calculated based on the size of the indoor space SI (floor area 75 ^m2 and capacity 25 people). Assuming that 30 ^m3 /h per person is required as a measure against pathogen infection, the second ventilation volume is calculated as 750 ^m3 /h (25 x 30 ^m3 /h).

Next, in the second step, the difference between the second ventilation rate and the first ventilation rate is calculated as the additional ventilation rate (m ³ /h). The additional ventilation rate is determined to be 250 m ³ /h (second ventilation rate of 750 m ³ /h - first ventilation rate of 500 m ³ /h of the first ventilation device 10).

Next, in the third step, a ventilation device capable of providing additional ventilation is selected from the above-mentioned ventilation device candidates V1 to V6, and this ventilation device is selected as the second ventilation device 20. Here, the ventilation device V2 with a ventilation volume of 250 m ³ /h is selected as the second ventilation device 20.

Next, in the fourth step, the sum of the first air conditioning load, the second air conditioning load, and the third air conditioning load is calculated as the total air conditioning load. The second air conditioning load is the air conditioning load generated by ventilation by the existing first ventilation device 10 as described above. The sum of the second air conditioning load generated by ventilation by the existing first ventilation device 10 (ventilation volume 500 m ³ /h) and the first air conditioning load is 11.3 kW as described above in the case of an indoor space SI with a floor area of 75 m ² in a general store. The third air conditioning load is an additional air conditioning load caused by the additional installation of the second ventilation device 20 and accompanying the ventilation operation of the second ventilation device 20. When the ventilation device selected as the second ventilation device 20 is the ventilation device V2 with a ventilation volume of 250 m ³ /h, the additional air conditioning load (third air conditioning load) is 0.6 kW when the outdoor temperature is 35° C. and the indoor temperature is 27° C. In the case of the above-mentioned open window ventilation, the load is 1.5 kW under the same conditions, but when the second ventilation device 20 is used, the additional air conditioning load is 0.6 kW because total heat exchange is performed in the heat exchange element 40. Therefore, the total air conditioning load is 11.9 kW (11.3 kW + 0.6 kW).

For reference, the additional air conditioning load and other values for each combination of the candidate second ventilation device 20 and candidate air conditioning indoor unit 30 are shown in Figure 5.

Next, in the fifth step, an air conditioning indoor unit 30 with the air conditioning capacity to process the total air conditioning load is selected from the above candidate air conditioning indoor units A1 to A9. Here, the 5 horsepower (12.5 kW) air conditioning indoor unit A8, which has already been installed in the indoor space SI, is selected as the air conditioning indoor unit 30. This is because 5 horsepower (12.5 kW) can process the total air conditioning load (11.9 kW).

Next, in the sixth step, it is determined whether the air volume at maximum ventilation of the second ventilation device 20 selected in the third step is 30% or less of the rated air volume of the air conditioning indoor unit 30 selected in the fifth step. Here, the air volume at maximum ventilation of the second ventilation device 20 is 30% or less of the rated air volume of the air conditioning indoor unit 30. For this reason, the selection of the second ventilation device and the air conditioning indoor unit in the seventh step is not reviewed.

In this way, as shown in FIG. 4C, a second ventilation device 20 having a heat exchange element 40 for performing total heat exchange is additionally installed, and the air conditioning ventilation system 100 is formed by the second ventilation device 20 and the existing 5 horsepower air conditioning indoor unit 30.

As mentioned above, when using open window ventilation as a measure against pathogen infection, the 5 horsepower air conditioning indoor unit 30 must be removed and a new 6 horsepower (14.0 kW) air conditioning indoor unit must be installed. However, when installing an additional second ventilation device 20 having a heat exchange element 40 for total heat exchange, the existing 5 horsepower air conditioning indoor unit 30 can continue to be used as is.

(8) Characteristics of the method for selecting the secondary ventilation system (8-1)
According to the method for selecting the second ventilation device described in (7) above, the second ventilation device 20 is selected in accordance with the unprecedented and excellent idea of utilizing the first ventilation volume of the existing first ventilation device 10 as is and supplementing the insufficient additional ventilation volume with the second ventilation device 20. This realizes ventilation of the second ventilation volume required as a measure against pathogen infection while suppressing costs.

(8-2)
When an additional second ventilation device 20 is installed in the indoor space SI in addition to the existing first ventilation device 10, it is expected that the air conditioning load of the indoor space SI will increase due to ventilation by the second ventilation device 20. If this is not taken into consideration, the thermal environment of the indoor space SI may deteriorate. In view of this, in the above-mentioned method for selecting the second ventilation device 20 and the air conditioning indoor unit 30, an air conditioning indoor unit 30 that can handle the total air conditioning load including the air conditioning load generated by ventilation is selected. This makes it possible to determine whether the air conditioning indoor unit 30 already installed in the indoor space SI can be used as is, or whether it is necessary to replace it with a new air conditioning indoor unit 30 with a higher air conditioning capacity.

(8-3)
In the method for selecting the second ventilation device described in (7) above, the second ventilation device 20 having the heat exchange element 40 that performs heat exchange between the supply air SA and the exhaust air EA is selected as the additional ventilation device. This makes it possible to minimize the deterioration of the thermal environment of the indoor space SI due to ventilation by the second ventilation device 20. Furthermore, since the third air conditioning load (air conditioning load associated with additional ventilation) is calculated taking into account the amount of heat exchanged in the heat exchange element 40, the total air conditioning load is not overcalculated. This allows the required air conditioning capacity to be correctly recognized, and an air conditioning indoor unit 30 that is neither excessive nor insufficient is selected.

(8-4)
When the air volume at the maximum ventilation volume of the second ventilation device 20 added as a measure against pathogen infection exceeds 30% of the rated air volume of the air conditioning indoor unit 30, even if the total air conditioning load can be handled by the air conditioning capacity of the air conditioning indoor unit 30, the operating efficiency of the air conditioner may deteriorate and the running costs may become high. In view of this, in the method for selecting the second ventilation device and the air conditioning indoor unit of this embodiment, the sixth and seventh steps are performed to review the selection of the second ventilation device and the air conditioning indoor unit. This makes it possible to select, for example, an air conditioning indoor unit with a higher rated air volume or air conditioning capacity, thereby reducing the running costs of air conditioning and ventilation.

(8-5)
In the above embodiment, by preparing many candidates for the air conditioning indoor unit as shown in (7-4) above, it becomes possible to select a more appropriate air conditioning indoor unit 30 according to the selected second ventilation device 20. This makes it possible to reduce the running costs and installation costs of the air conditioning ventilation system 100.

(9) Variations and Features of Air Conditioning and Ventilation Systems (9-1)
In the above air conditioning ventilation system 100 (1) to (6), the air conditioning indoor unit 30 has already been installed, but the second ventilation device 20, the air conditioning indoor unit 30, and the ducts 21 to 24 such as the supply air duct 24 that form the flow path of the supply air SA may be packaged as the air conditioning ventilation system 100. The ducts 21 to 24 connected to the second ventilation device and the supply air intake member 30a described later are configured to have a certain flow path resistance so that the air volume supplied to the room becomes the target ventilation air volume when the fan of the second ventilation device 20 is operated at a predetermined rotation speed. Being packaged means that the system can supply the target ventilation air volume without having to calculate the flow path resistance on site as a result of the desired flow path resistance being generated simply by connecting the ducts 21 to 24 and the supply air intake member 30 having flow path resistance to the air conditioning indoor unit 30 and the second ventilation device 20. By adopting the packaged air conditioning and ventilation system 100, the introduction costs, including the cost of installation work, can be reduced compared to when connecting the ventilation device and the indoor unit of the air conditioner using parts such as ducts procured locally.

(9-2)
In addition, in the air conditioning ventilation system 100, the supply air SA from the second ventilation device 20 enters the air conditioning indoor unit 30, so that the temperature of the supply air SA can be adjusted or the humidity adjusted by the air conditioning indoor unit 30 before being supplied to the indoor space SI.

(9-3)
The air conditioning ventilation system 100 includes a remote control 90 that controls the air conditioning indoor unit 30 and the second ventilation device 20. This makes it possible to link the operation and stop of the air conditioning indoor unit 30 and the second ventilation device 20, and to control the second ventilation device 20 so that ventilation is not performed when the air conditioning indoor unit 30 is not operating.

In the air conditioning ventilation system 100, if ventilation is performed by the second ventilation device 20 when the air conditioning indoor unit 30 is not operating, a problem may occur in which dust attached to the suction filter of the air conditioning indoor unit 30 falls into the indoor space SI. This problem can be prevented by installing the remote control 90 and controlling the air conditioning indoor unit 30 and the second ventilation device 20 in conjunction with each other.

(10) Specific examples of air conditioning and ventilation systems (10-1)
In the specific example of the selection of the second ventilation device in (7-6) above, it is assumed that a 5 horsepower (5 HP) air conditioning indoor unit 30 and a first ventilation device 10 with a ventilation volume of 500 ^m3 /h are installed in the indoor space SI (floor area 75 ^m2 ) of a store, and a case is described in which, as a measure to prevent pathogen infection, the current ventilation volume (20 ^m3 /h per person) is increased to ensure a total ventilation volume of 30 ^m3 /h per person for the indoor space SI.

If selection is made using the same concept as this specific example, it is preferable that an air conditioning ventilation system to be installed in an indoor space with a floor area of 70 ^m2 or more and 95 ^m2 or less be equipped with an air conditioning indoor unit with a rated cooling capacity of approximately 12.5 kW and a second ventilation device with a maximum ventilation volume of 250 ^m3 /h.

If this air conditioning and ventilation system is installed in an indoor space in an existing building, with the above floor area, where the first ventilation volume (for example, twice the maximum ventilation volume of the second ventilation device) is ensured, it is possible to obtain the ventilation volume required to prevent pathogen infection, and the total air conditioning load of the indoor space, including the air conditioning load due to the increased ventilation volume, can be handled by the air conditioner.

(10-2)
In the specific example of the selection of the second ventilation device in (7-6) above, it is assumed that a 5 horsepower (5 HP) air conditioning indoor unit 30 and a first ventilation device 10 with a ventilation volume of 500 ^m3 /h are installed in the indoor space SI (floor area 75 ^m2 ) of a store, and a case is described in which, as a measure to prevent pathogen infection, the current ventilation volume (20 ^m3 /h per person) is increased to ensure a total ventilation volume of 30 ^m3 /h per person for the indoor space SI.

If selection is made using the same concept as this specific example, it is preferable that an air conditioning ventilation system to be installed in an indoor space with a floor area of 40 ^m2 or more and 60 ^m2 or less be equipped with an air conditioning indoor unit with a rated cooling capacity of approximately 7.1 kW and a second ventilation device with a maximum ventilation volume of 150 ^m3 /h.

If this air conditioning and ventilation system is installed in an indoor space in an existing building, with the above floor area, where the first ventilation volume (for example, twice the maximum ventilation volume of the second ventilation device) is ensured, it is possible to obtain the ventilation volume required to prevent pathogen infection, and the total air conditioning load of the indoor space, including the air conditioning load due to the increased ventilation volume, can be handled by the air conditioner.

(11) Modification (11-1)
In the air conditioning ventilation system 100 of the above embodiment, the indoor air of the indoor space SI reaches the heat exchange element 40 as the return air RA through the return air passage 21a, and the air that has passed through the heat exchange element 40 passes through the exhaust fan 28 and is discharged to the outdoor space SO as the exhaust air EA. On the other hand, the outside air OA of the outdoor space SO reaches the heat exchange element 40 through the outside air introduction passage 23a, and the air that has passed through the heat exchange element 40 passes through the supply air fan 26 and is supplied to the indoor space SI as fresh supply air SA. However, the supply air SA needs a certain degree of static pressure to pass through a narrow flow path in the air conditioning indoor unit 30 to which the supply air intake member 30a is attached. For this reason, there is a risk of a pressure difference occurring between the flow paths of the return air RA and the exhaust air EA, which have a small flow path resistance, and the flow paths of the outside air OA and the supply air SA, which have a large flow path resistance.

For this reason, if the pressure loss of the supply air SA becomes significantly large, it is preferable to provide an additional pressure adjustment unit in the air conditioning ventilation system 100.

For example, as a pressure adjustment unit, a pressure reducing member 58 such as a baffle or damper is provided in the first space 51a of the second ventilation device 20 in FIG. 1A to increase the flow resistance of the return air RA and the exhaust air EA. This reduces the pressure difference, and the problem of the outside air and the return air mixing in the heat exchange element 40 almost never occurs.

(11-2)
Although the embodiments of the present disclosure have been described above, it will be understood that various changes in form and details can be made without departing from the spirit and scope of the present disclosure described in the claims.

10 First ventilation device 20 Second ventilation device (ventilation device, additional ventilation device)
24 Air supply passage forming member 24a Air supply passage 26 Air supply fan 28 Exhaust fan 30 Air conditioner indoor unit (air conditioner)
30a Air intake member 33 Inlet of air intake member (air intake port)
40 Heat exchange element 51 First opening 52 Second opening 53 Third opening 54 Fourth opening 58 Pressure reducing member (pressure adjusting section)
90 Remote control (controller)
100 Air conditioning ventilation system EA Exhaust OA Outside air RA Return air SA Supply air SI Indoor space SO Outdoor space (outside the indoor space)

JP 2005-300112 A

Claims (8)

A method for selecting an additional ventilation device and an air conditioning device, when a different ventilation device is newly installed as an additional ventilation device (20) for an indoor space (SI) in which an existing first ventilation device (10) having a first ventilation volume per hour is installed, comprising the steps of selecting an additional ventilation device (20) by a method for selecting an additional ventilation device and further selecting an air conditioning device (30) for air-conditioning the indoor space,
A first step of calculating a second ventilation volume, which is a ventilation volume per hour required as a measure against pathogen infection, based on the size of the indoor space (SI);
A second step of determining a difference between the second ventilation volume and the first ventilation volume as an additional ventilation volume;
a third step of selecting a ventilation device capable of ventilating the additional ventilation volume as an additional ventilation device (20);
A fourth step of calculating a total air conditioning load by adding together a first air conditioning load determined based on the size of the indoor space (SI), a second air conditioning load generated by ventilation using the existing first ventilation device, and a third air conditioning load generated by ventilation using the additional ventilation device selected in the third step; and
a fifth step of selecting an air conditioner (30) having an air conditioning capacity capable of processing the total air conditioning load from among a plurality of air conditioner candidates having different air conditioning capacities;
A method for selecting an additional ventilation device and an air conditioning device , comprising: In the third step, a ventilation device having a heat exchange section (40) that performs heat exchange between outside air (OA) that is supplied air (SA) to the indoor space and return air (RA) that is exhaust air (EA) from the indoor space is selected as an additional ventilation device (20);
In the fourth step, the third air conditioning load is calculated in consideration of a heat exchange amount in the heat exchange section (40) of the selected additional ventilation device.
A method for selecting a supplementary ventilation device and an air-conditioning device according to claim 1 . In the third step, an additional ventilation device is selected from among a plurality of candidate ventilation devices having different maximum ventilation volumes;
the number of the plurality of air conditioning device candidates in the fifth step is greater than the number of the plurality of ventilator candidates in the third step;
A method for selecting a supplementary ventilation device and an air-conditioning device according to claim 1 or 2 . An air conditioning and ventilation system to be installed in an indoor space having a floor area of 70 m2 or ^more and 95 ^m2 or less and an existing first ventilation device having a first ventilation volume per hour,
The additional ventilation device and the air conditioning device are selected by the selection method of the additional ventilation device and the air conditioning device according to any one of claims 1 to 3,
The air conditioner has a cooling rated capacity of about 12.5 kW;
The additional ventilation device has a maximum ventilation volume of 250 ^m3 /h;
An air conditioning and ventilation system. An air conditioning and ventilation system to be installed in an indoor space having a floor area of 40 m2 or ^more and 60 ^m2 or less and an existing first ventilation device having a first ventilation volume per hour,
The additional ventilation device and the air conditioning device are selected by the selection method of the additional ventilation device and the air conditioning device according to any one of claims 1 to 3,
The air conditioner has a cooling rated capacity of about 7.1 kW;
The additional ventilation device has a maximum ventilation volume of 150 ^m3 /h;
An air conditioning and ventilation system. The air conditioning device has an air supply port (33) that receives supply air (SA) from outside the indoor space,
The ventilation device has a supply air fan (26) for sending outside air (OA) to the air conditioning device as the supply air (SA),
an air supply path forming member (24) connected to the ventilation device and the air conditioning device and forming an air supply path (24a) for guiding the supply air (SA) from the ventilation device to the air supply port of the air conditioning device;
The air conditioning and ventilation system according to claim 4 or 5 , further comprising: The ventilation device (20) further includes a casing (50) that houses the supply air fan (26), an exhaust fan (28) that is housed in the casing and sends air in the indoor space (SI) to the outside (SO) of the indoor space as exhaust air (EA), and a heat exchanger (40) that exchanges heat between return air (RA) that becomes the exhaust air (EA) and the outside air (OA),
The casing is formed with a first opening (51) for taking in air from the indoor space as the return air (RA), a second opening (52) for sending the return air (RA) to the outside of the indoor space as the exhaust air (EA), a third opening (53) for taking in the outside air (OA), and a fourth opening (54) to which the air supply path forming member is connected,
a pressure adjusting unit (58) that adjusts the pressure of air so that a difference between a pressure of return air (RA) flowing from the first opening (51) to the second opening (52) in the ventilation device and a pressure of outside air (OA) flowing from the third opening (53) to the fourth opening (54) in the ventilation device becomes small;
The air conditioning and ventilation system of claim 6 , further comprising: A remote controller (90) for controlling the air conditioning device and the ventilation device;
The air conditioning and ventilation system according to claim 4 , further comprising :

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