JP4036719B2 - Air supply temperature control device for air conditioner - Google Patents

Description

[0001]
BACKGROUND OF THE INVENTION
The present invention belongs to the technical field of an air supply temperature control device for an air conditioner. More specifically, the present invention belongs to the technical field of a load resetting device that resets a set value of a supply air temperature in accordance with a heat load in a controlled area.
[Prior art]
Conventionally, in order to perform air conditioning in buildings such as buildings, the controlled area to be air-conditioned is divided into a plurality of rooms (or blocks), and an air supply outlet is provided in each room, and a variable air supply amount adjustment unit The air-conditioning control in each room is performed by blowing air-conditioned supply air (hereinafter referred to as a VAV unit). The air supply to each room is provided in each room because the temperature of the air supply is controlled by an air conditioner installed in one place without controlling the temperature of the air supply for each room. In some cases, the temperature of all rooms cannot be controlled to the set temperature regardless of how the VAV unit is operated. In order to eliminate such an inconvenient situation, it is necessary to reset the set value of the supply air temperature in the air conditioner to increase the supply air temperature capability. Such an operation is usually called a load reset. Hereinafter, load reset in the conventional apparatus will be described.
[0003]
FIG. 4 shows a configuration diagram of a conventional air conditioning system (a system composed of an air conditioner and a controlled area), and FIG. 5 shows a block diagram of a conventional control device. The prior art will be described below based on these drawings. In FIG. 4, the controlled area 50 is composed of a plurality of rooms R-1, R-2,. The air outlet 51 of each room is connected to the VAV unit 52 directly or by a duct, and the VAV unit 52 is further connected to the air blowing side of the air supply fan 56 of the air conditioner 55 by an air supply duct 53. The VAV unit 52 is provided with a local controller 52a. The local controller 52a controls the air flow rate of the supply air based on the deviation between the temperature sensor 58 provided in each room and the set temperature, and adjusts the temperature of the room. It is carried out. The local controller 52 a is connected to the zone controller 60.
[0004]
The return air suction port 61 of each room communicates with the ventilation fan 56 of the air conditioner 55 through a return air duct 62, and indoor air is sucked by the ventilation fan 56. The interior of the air conditioner 55 is divided into three zones, that is, an air conditioning zone 55A, an exhaust zone 55B, and an outside air intake zone 55C. A cooling coil 63, an overheating coil 64, a humidifier 65, and an air supply fan 56 are arranged in this order in the air conditioning zone 55A. The cold water valve 63a and the heating steam valve 64a are controlled by a control signal sent from the main controller 70. Part of the air returned to the exhaust zone 55B passes through the exhaust duct 67 and is discharged to the outside, and the rest passes through the passage 66 provided in the partition plate between the zones 55A and 55B and enters the zone 55C. The air passes through the filter 69 together with the outside air taken in from the outside air intake duct 68 and enters the air conditioning zone 55A.
[0005]
The air supply duct 53 is provided with a temperature sensor 71 for measuring the temperature of the air supply. The return air duct 62 is provided with a temperature sensor 72 that measures the temperature of the return air and a carbon dioxide concentration sensor 73 that measures the concentration of carbon dioxide. Outputs of these sensors 71 to 73 are all connected to the input side of the main controller 70.
[0006]
FIG. 5 is a block diagram showing a functional relationship between the local controller 52a, the zone controller 60, and the main controller 70 of the conventional air conditioner. The local controller 52a calculates the required air volume ratios γ1... Γn based on the deviation Et between the room temperature measurement value PV and the room temperature set value SP and the operation mode (cooling mode, heating mode). The required air volume ratio γ1... Γn is a value representing the air volume required by each VAV unit as a percentage of the maximum design air volume (rated air volume) of the VAV unit. FIGS. 6A to 6C show examples of the relationship between the temperature deviation Et and the required air volume ratio by different VAV unit manufacturers. As can be seen from this example, the required air volume ratio differs depending on the manufacturer, or even the same manufacturer, depending on the model. Further, even in the case of VAV units of the same manufacturer, the required air volume ratio varies depending on use conditions or control conditions and has a certain range. For example, if it is desired to increase the sensitivity even with the same temperature deviation Et, the required air volume ratio is increased. Alternatively, when the same temperature deviation Et continues for a long time, the required air volume ratio may be increased.
[0007]
Further, the required air volume ratio and the required air volume have the relationship shown in FIG. That is, as shown in FIG. 7, the required air volume ratio and the required air volume correspond to (1: 1). The maximum air volume of the VAV unit, for example, 300 CMH (cubic meter / hour) is set to 100%, and the minimum air volume, for example, 60 CMH is set to 20%. Therefore, the required air volume of 180 CMH is 60% in the required air volume ratio. As is clear from this, the fact that the required air volume ratio γ has a width with respect to a certain temperature deviation Et means that the required air volume also has a width and cannot be uniquely determined.
[0008]
A conventional method for calculating the supply air temperature setting value using the required air volume ratio will be described below. The zone controller 60 obtains the maximum required air volume ratio (γmax) from the required air volume ratios γ1... Γn of VAV-1. In the main controller 70, the supply air temperature setting unit 74 calculates and sets the supply air temperature setting value based on the maximum required air volume ratio γmax. This is called a load reset. Further, the control deviation calculation unit 75 obtains a deviation between the set value after the load reset and the supply air temperature measured by the sensor 71. The valve control unit 75 calculates the control amount (cold water flow rate) of the chilled water valve and the control amount (steam flow rate) of the heating steam valve in consideration of the operation mode, and calculates the chilled water valve opening calculation unit 78 and the heating from these control amounts. The steam valve opening calculation unit 79 calculates the valve opening and outputs it to the valves 63a and 64a to control the supply air temperature.
[0009]
[Problems to be solved by the invention]
As described above, in the conventional apparatus, the load reset value is determined based on the maximum required air volume ratio (γmax) of the required air volume ratios (γ1... Γn). However, the required air volume ratio varies depending on the manufacturer and operating conditions of the VAV unit (there is a range), so even if the supply air temperature can be controlled by the air conditioner controller, the air conditioning control performance is different and the indoor temperature deviation is almost zero. Even in the vicinity, there is a disadvantage that the control function does not work well by raising or lowering the supply air temperature setting value. The present invention has been made to solve such problems, and a new parameter uniquely determined with respect to the deviation Et is introduced instead of the required air volume ratio (γ1... Γn).
[0010]
[Means for Solving the Problems]
In order to solve the above problems, the present invention employs the following means. That is,
The invention according to claim 1 is a variable air supply adjustment unit including a supply air outlet provided in each room of a controlled area, a local controller for controlling an outlet provided upstream thereof, An air conditioner provided with a controller, an air supply air duct for blowing air conditioned from the air conditioner to each of the air supply outlets, a zone controller provided between lines of the local controller and the main controller; In the air conditioning system equipped with
The local controller adjusts the air volume of the variable air supply amount adjustment unit based on a deviation between the set indoor temperature and the measured value of the indoor thermometer, and based on the operation mode, the indoor temperature set value, and the measured value of the indoor thermometer. Calculating the parameter value of the LR parameter based on the magnitude of the request for enhancement or weakening of heating or cooling, and transmitting the parameter value to the zone controller,
The zone controller calculates the maximum value of the LR parameter value transmitted from each local controller, transmits the maximum value of the LR parameter to the main controller,
The supply air temperature control device provided in the main controller obtains a change for correcting the set temperature according to a predetermined program based on the received maximum value of the LR parameter, and adds the obtained correction to the set temperature. An air supply temperature control device for an air conditioner, wherein the load is reset based on the corrected set temperature .
[0011]
According to a second aspect of the present invention, in the first aspect of the invention, the LR parameter is:
Taking the deviation range between the room temperature measurement value and the room temperature setting value on the horizontal axis as (−Centigrade PB degree to + Centigrade PB degree) and taking the parameter taking the numerical value between (0% to 100%) on the vertical axis, Relation between the value on the vertical axis and the value on the horizontal axis by a linear function passing through the origin,
And the deviation between the room temperature measurement value and the room temperature setting value is defined as (room temperature measurement value-room temperature setting value) in the cooling mode, and in the heating mode (room temperature setting value-room temperature measurement value),
It is characterized in that it is a parameter that takes a numerical value between (0% to 100%) uniquely determined from the deviation between the room temperature measurement value calculated by the local controller and the room temperature set value .
[0012]
The invention of claim 3 is the invention of claim 2,
An upper limit threshold and a lower limit threshold are set between the deviation ranges, the lower limit to the lower limit threshold of the deviation range is set as the “overcapacity zone”, the lower limit threshold to the upper limit threshold is set as the “dead zone”, and the upper limit threshold to the deviation range is set. Are divided into the above-mentioned deviation ranges,
For each band indicated by the LR parameter with the deviation range replaced by the linear function,
When the maximum value of the LR parameter calculated by the zone controller is a value included in the “overcapacity zone”, a change in the preset temperature is added to calculate the supply air temperature set value and change the setting. In the case of a value included in the “dead zone”, the setting value of the supply air temperature is not changed. In the case of a value included in the “insufficient zone”, the change in the preset temperature is subtracted. It is characterized by calculating the value and changing the setting.
DETAILED DESCRIPTION OF THE INVENTION
Hereinafter, embodiments in which the present invention is implemented will be described. In the present embodiment, only the control contents of the local controller 52a, the zone controller 60, and the main controller 70 of the conventional device described above are different, and the component device itself is the same as the conventional device (FIG. 4). Use this. FIG. 1 is a block diagram showing a functional relationship with the local controller 11a, the zone controller 20, and the main controller 30.
[0015]
The local controller 11a is configured as follows. That is, the room temperature deviation calculation unit 12 obtains a deviation Et between the room temperature measurement value PV and the room temperature set value SP by calculation. The room temperature control unit 13 calculates the required air volume ratio γ1 based on the deviation Et and the operation mode (cooling mode or heating mode). The required air volume ratio γ1 is the same as that in the above-described conventional apparatus. The damper opening calculation unit 16 is the same as that in the conventional device described above, and obtains the required air volume SP from the required air volume ratio γ1 and the damper provided in the VAV unit from the air volume PV provided in the VAV. Control the opening. Therefore, the control of the blast air volume of the VAV unit is performed in the same manner as in the prior art.
[0016]
Similarly, the parameter calculation unit 14 obtains an LR parameter value based on the deviation Et and the operation mode (cooling mode, heating mode). The method for calculating the LR parameter will be described with reference to FIG. In FIG. 2, the deviation Et is defined as Et = room temperature measurement value PV−room temperature set value SP in the cooling mode, and Et = room temperature set value SP−room temperature measurement value PV in the heating mode. Further, the deviation Et is in a range of (−Celsius PB degree to + Centigrade PB degree), and corresponds to a range of (0% to 100%) of the LR parameter. Outside the above range, it is 0% or 100%. For example, when PB = 2 degrees Celsius, the LR parameter is 100% as shown in FIG. Therefore, if the deviation range (−PB to + PB) is a constant value, the LR parameter is a constant value regardless of the type of VAV unit or the manufacturer.
[0017]
Next, an upper limit threshold ta and a lower limit threshold tb are provided for the deviation Et, and the range of the deviation Et is divided into A, B, and C. Similarly, LR parameters Ra and Rb corresponding to the upper limit threshold ta and the lower limit threshold tb are obtained, and the range of the LR parameter is divided into E, F, and G. The deviation range B (or parameter range F) is regarded as a dead zone or a comfortable state, and no adjustment is required. The deviation range C (or parameter range G) is a capacity shortage zone, that is, the cooling capacity or the heating capacity is increased considering that the cooling mode is a hot state or the heating mode is a cold state. The deviation range A (or parameter range E) is an overcapacity zone, that is, the cooling capacity or the heating capacity is reduced by regarding the cooling mode as a cold state or the heating mode as a hot state. In this way, the control can be simplified by classifying the parameters.
[0018]
The zone controller 20 receives the LR parameters LR1 to LRn calculated from the units VAV-1 to VAV-n, and performs an operation for obtaining their maximum value LRmax. The supply air temperature set value calculation unit (load reset unit) 31 of the main controller 30 calculates the load reset value from the maximum value LRmax of the LR parameter calculated by the zone controller 20 and the operation mode according to the procedure shown in FIG. First, in step S1, it is determined whether the mode is the cooling mode or the heating mode. If the mode is the cooling mode, step S2 is executed, and if the mode is the heating mode, step S7 is executed. In step S2, LRmax is compared with an upper threshold Ra (see FIG. 2). If LRmax ≧ upper threshold Ra is true (Yes), the set temperature is decreased by ΔT (step S4), and if not (No), it is further compared with the lower threshold Rb (step S3), and LRmax ≦ lower threshold Rb is true. If so, the set temperature is increased by ΔT (step S5). If not, the set temperature remains unchanged (ΔT = 0) (step S6).
[0019]
The same applies to the heating mode. In step S7, LRmax is compared with the upper threshold Ra. If LRmax ≧ upper limit threshold Ra is true, the set temperature is decreased by ΔT (step S9). If not, it is further compared with the lower limit threshold Rb (step S8). If LRmax ≦ lower limit threshold Rb is true, the set temperature is ΔT. (Step S10). If not, the set temperature remains unchanged (ΔT = 0) (step S11). The magnitude of the change ΔT in the set temperature is determined as appropriate. If the change ΔT is too large, the sensitivity becomes too high and the control becomes oscillating, and if it is too small, the result of the control hardly appears.
[0020]
Further, the main controller 30 continues the following operation. That is, the supply air temperature setting unit 32 obtains the set temperature Tsp by adding or subtracting the change ΔT of the set temperature obtained above to set (or reset) the supply air temperature. The control deviation calculation unit 33, the valve control unit 34, the cold water valve opening calculation unit 35, and the heating steam valve opening calculation unit 36 perform exactly the same operations as those of the conventional apparatus described above.
[0021]
As described above, in this embodiment, a dedicated LR parameter is defined for load reset, and a parameter that can evaluate the thermal load state in common regardless of the manufacturer, model, etc. of the VAV unit is introduced, and its value As a result, the load reset control of the entire system is performed, so that an effective load reset control is always possible, and a simple and clear control method can be adopted because there is no need to consider the difference between manufacturers.
[0022]
The embodiments and examples of the present invention have been described in detail with reference to the drawings. However, the specific configuration is not limited to the examples, and there are design changes and the like without departing from the gist of the present invention. Are also included in the present invention. For example, the common parameter is not an LR parameter, but may have another name or another numerical range.
[0023]
【The invention's effect】
As described above, according to the configuration of the present invention, a common parameter capable of evaluating the thermal load state is introduced, and the load reset control of the entire system is performed based on the value. Therefore, effective control is always possible, In addition, an effect that a simple and clear control method can be adopted is obtained.
[Brief description of the drawings]
FIG. 1 is a functional block diagram of a controller according to an embodiment of the present invention.
FIG. 2 shows how to determine the LR parameter.
FIG. 3 is a flowchart for obtaining a load reset value in the present embodiment.
FIG. 4 shows a block diagram of an apparatus in a conventional apparatus.
FIG. 5 shows a functional block diagram of a controller in a conventional apparatus.
FIGS. 6A to 6C show the change range of the required air volume ratio in the conventional apparatus.
FIG. 7 shows a relationship between a required air volume ratio and a required air volume in a conventional apparatus.
[Explanation of symbols]
11a Local controller 12 Deviation calculation unit 14 LR parameter calculation unit 20 Zone controller 30 Main controller 31 Supply air temperature set value calculation unit 33 Control deviation calculation unit (ta, tb) Dead zone Ra, Rb Upper limit (lower limit) threshold

Claims (3)

A supply air outlet provided in each room of the controlled area; a variable air supply amount adjustment unit provided with a local controller for controlling the air supply amount provided upstream thereof; an air conditioner provided with a main controller; In an air conditioning system comprising an air supply air duct that blows air supplied from an air conditioner to each of the air supply outlets, and a zone controller provided between lines of the local controller and the main controller,
The local controller adjusts the air volume of the variable air supply amount adjustment unit according to a deviation between a set indoor temperature and a measured value of the indoor thermometer, and a deviation between the operation mode and the set value of the indoor temperature and the measured value of the indoor thermometer. Calculating the parameter value of the LR parameter based on the magnitude of the change to increase or decrease the heating or cooling based on the parameter value, and sending the parameter value to the zone controller,
The zone controller calculates the maximum value of the LR parameter value transmitted from each local controller, transmits the maximum value of the LR parameter to the main controller,
The supply air temperature control device provided in the main controller obtains a change for correcting the set temperature according to a predetermined program based on the received maximum value of the LR parameter, and adds the obtained correction to the set temperature. An air supply temperature control device for an air conditioner that controls a valve of a cooling coil or a valve of a heating boil based on the corrected set temperature . The LR parameter is:
Taking the deviation range between the room temperature measurement value and the room temperature setting value on the horizontal axis as (−Centigrade PB degree to + Centigrade PB degree) and taking the parameter taking the numerical value between (0% to 100%) on the vertical axis, Relation between the value on the vertical axis and the value on the horizontal axis by a linear function passing through the origin,
And the deviation between the room temperature measurement value and the room temperature setting value is defined as (room temperature measurement value-room temperature setting value) in the cooling mode, and in the heating mode (room temperature setting value-room temperature measurement value),
The parameter taking a numerical value between (0% to 100%) uniquely determined from a deviation between a room temperature measurement value calculated by a local controller and a room temperature setting value . Air supply temperature control device for air conditioners. An upper limit threshold and a lower limit threshold are set between the deviation ranges, the lower limit to the lower limit threshold of the deviation range is set as the “overcapacity zone”, the lower limit threshold to the upper limit threshold is set as the “dead zone”, and the upper limit threshold to the deviation range is set. Are divided into the above-mentioned deviation ranges,
For each band indicated by the LR parameter with the deviation range replaced by the linear function,
When the maximum value of the LR parameter calculated by the zone controller is a value included in the “overcapacity zone”, a change in the preset temperature is added to calculate the supply air temperature set value and change the setting. In the case of a value included in the “dead zone”, the setting value of the supply air temperature is not changed. In the case of a value included in the “insufficient zone”, the change in the preset temperature is subtracted. The supply air temperature control device for an air conditioner according to any one of claims 2 to 5, wherein a value is calculated and the setting is changed .

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