JPH0812010B2 - Air conditioner - Google Patents

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an air conditioner, and more particularly to an air conditioner having a total heat exchanger.

[0002]

2. Description of the Related Art A typical conventional air conditioner equipped with a total heat exchanger will be described with reference to FIGS. FIG. 2 is a diagram showing a schematic configuration of a conventional air conditioner, and FIG. 3 is a flow sheet corresponding to FIG. The air conditioner includes an air supply fan 31 that supplies air to the room, a return air fan 32 that recirculates the room air, and a main filter 33 that filters the air.
And a cold / hot water coil 34 and a total heat exchanger 35.

The operation of the conventional air conditioner 40 will be briefly described with reference to FIG. 2 and FIG.
6, the main filter 33, the cold / hot water coil 34, and the compartment 37 are sucked into the air supply fan 31, the pressure is increased, and then the air is supplied to the air-conditioned room (not shown) through the air supply duct connection port 38. On the other hand, the return air from the room is the return air duct connection port 3
After being sucked into the return air fan 32 and boosted in pressure, it enters the compartment 40 and splits, and one is discharged as exhaust air to the outside through the total heat exchanger 35, the compartment 41 and the exhaust duct connection port 42. , The other one enters the compartment 36 through the damper 43, is mixed with the outside air, and is then supplied to the room through the supply air path again. The outside air supplied as fresh air into the room enters the compartment 36 through the outside air intake 44 through the total heat exchanger 35, is mixed with the return air, and then is supplied into the room through the supply air path.

In the conventional air conditioner shown in FIG. 2,
The return air path is provided with a temperature sensor 45 and a relative humidity sensor 46, and the outside air introduction system path is provided with a temperature sensor 47 and a relative humidity sensor 48, respectively. Then, the enthalpy in the room is calculated by the temperature sensor 45 and the relative humidity sensor 46,
Further, the enthalpy of the outside air is calculated by the temperature sensor 47 and the relative humidity sensor 48, the enthalpy of the outside air is compared with the enthalpy of the room, and if the enthalpy of the outside air is high, the outside air is introduced into the room through the total heat exchanger 35, On the other hand, when the enthalpy of the outside air is lower than the enthalpy of the room, the outside air bypasses the total heat exchanger 35 and is supplied to the room.

[0005]

As described above, in the conventional air conditioner, the enthalpy of the outside air and the indoor air are different when the total heat exchanger is used and when the total heat exchanger is bypassed and not used. This was done by measuring the enthalpy and comparing these enthalpies. Therefore, as is clear from FIG. 2, the temperature sensor and the relative humidity sensor are provided in the return air path, and the temperature sensor and the relative humidity sensor are similarly installed in the outside air introduction path. Therefore, there is a problem in that there are two types of sensors. In addition, since the enthalpy must be calculated by processing the information obtained from these two types of sensors, there is a problem that the calculation processing method is complicated.

The present invention has been made in view of the above-mentioned points, and its object is to measure a wet-bulb temperature by using a wet-bulb temperature line which is a straight line substantially parallel to an isenthalpic line. An object of the present invention is to provide an air conditioner provided with a bulb temperature sensor and capable of controlling the total heat exchanger only by the wet bulb temperature sensor.

[0007]

In order to achieve the above-mentioned object, an air conditioner of the present invention is provided with an air supply fan for supplying air into the room and a fan for exhausting indoor air to the outside. An outdoor air introduction fan for introducing outdoor air, a main filter for filtering air, a hot and cold water coil, a total heat exchanger, an exhaust damper provided in the exhaust system passage, and an outdoor air introduction system passage. An outside air damper and a bypass for total heat exchanger bypass, and a part of the return air from the air-conditioned room is exhausted to the exhaust fan through the exhaust damper and the total heat exchanger, and When using a total heat exchanger, the outside air introduced by the outside air fan is mixed with the return air through the outside air damper via the total heat exchanger, and when the total heat exchanger is not used, the introduction is performed. Bypassing the generated outside air to the total heat exchanger An air conditioner that passes through a bypass damper, is mixed with the return air, is cooled by the cold / hot water coil during cooling, is heated during heating, and supplies air to the air-conditioned room by the air supply fan. It has an outside air wet-bulb temperature sensor that measures the wet-bulb temperature of the outside air and an indoor return-air wet-bulb temperature sensor that measures the wet-bulb temperature of the return air from the room. While opening the damper and closing the damper for the outside air total heat exchanger bypass circuit, during cooling, the outside air wet bulb temperature measured by the outside air wet bulb temperature sensor is the indoor return air measured by the indoor return air wet bulb temperature sensor. When the temperature is lower than the wet bulb temperature, the outside air damper is closed and the outside air total heat exchanger bypass circuit damper is opened.

[0008]

According to the present invention having the above-described structure, the outside air damper is opened and the outside air total heat exchange is performed at all times during cooling and heating by using the wet bulb temperature line which is a straight line substantially parallel to the isenthalpic line. While using the total heat exchanger with the bypass valve damper closed, the outside air wet bulb temperature measured by the outside air wet bulb temperature sensor during cooling is lower than the indoor return air wet bulb temperature measured by the indoor return air wet bulb temperature sensor. In this case, by closing the outside air damper and opening the outside air total heat exchanger bypass circuit damper, it is possible to bypass the total heat exchanger and introduce the outside air into the room. As a result, the sensor only needs to install the wet-bulb temperature sensor only in the return air path and the outside air path, eliminating the need for multiple types of sensors, and reducing the cost of the device as well as the sensor. The processing method for processing the above information becomes extremely simple.

[0009]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENT An embodiment of an air conditioner according to the present invention will be described below with reference to FIG.

FIG. 1 is a diagram showing a basic structure of an air conditioner according to the present invention. The air conditioner is an air supply fan 1 for supplying air into a room with a variable air flow rate for variable speed operation by an inverter 2. An exhaust fan 3 for discharging indoor air to the outside, an outside air fan 4 for introducing outdoor air, a main filter 5 for filtering the air, a cold / hot water coil 6, and a total heat exchanger 7. There is. Then, the return air path for returning the air in the air-conditioned room is configured to be guided to the main filter 5 via the return air pre-filter 8 without passing through the return air fan, and the exhaust gas is branched from the return air path. The exhaust path passes through the partition 9, the exhaust damper 10, the total heat exchanger 7 and the exhaust fan 3, and the exhaust fan 3 exhausts the outside air to the outside. The air is introduced from the intake 12 to the outside air fan 4 through the outside air pre-filter 13, the outside air introduction path is branched downstream of the outside air fan 4, and passes through the outside air damper 14 via the total heat exchanger 7,
Path from compartment 9 to main filter 5 and total heat exchanger 7
To bypass the outside air total heat exchanger bypass circuit damper 15,
It is configured to be introduced into the main filter 5 from the section 9.

The operation of the air conditioner of this embodiment shown in FIG. 1 will be briefly described. The air supply to the air-conditioned room is from the compartment 9 through the main filter 5, the hot / cold water coil 6, and the compartment 16 to the air supply fan. After being sucked into the unit 1 and boosted in pressure, it is supplied into the air-conditioned room through the air supply duct 17.

The return air from the air-conditioned room is diverted from the compartment 9 through the return air pre-filter 8 and, on the other hand, the return air is passed through the exhaust damper 10 as exhaust gas and the total heat exchanger 7 to be exhausted. The fan 3 discharges the air to the outside of the room, and the other one is mixed with the outside air in the compartment 9 and then supplied to the air-conditioned room through the air supply path again. On the other hand, the outside air supplied as fresh air into the air-conditioned room is sucked from the outside air inlet 12 by the outside air fan 4, and when the total heat exchanger 7 is used, the outside air passes through the total heat exchanger 7 to reach the outside air. After passing through the damper 14 and being mixed with the return air, it is supplied again into the air-conditioned room through the supply air path. On the other hand, when the total heat exchanger 7 is not used, the outside air bypasses the total heat exchanger 7, passes through the outside air total heat exchanger bypass bypass damper 15, is mixed with the return air, and then is supplied again. It is supplied to the air-conditioned room via the route.

Further, the air conditioner of the present invention is provided with a return air passage,
That is, the indoor return air wet bulb temperature sensor 21 is provided on the downstream side of the return air pre-filter 8 and on the upstream side of the mixing portion where the outside air and the return air are mixed, while the outside air introduction path, that is, the downstream side of the outside air pre-filter. In addition, the outside air wet bulb temperature sensor 22 is installed on the upstream side of the outside air fan 4. The indoor return air wet bulb temperature sensor 21 and the outside air wet bulb temperature sensor 22 are connected to the controller 20. The both wet-bulb temperature sensors 21 and 22 include gauze 2 in the temperature sensors 21s and 22s.
1a, 22a and the like are attached, and containers 21b, 22b in which gauze and the like are immersed are provided. And these gauze 21a, 22a etc. and container 21b, 2
In order to supply water to 2b, a water supply conduit 26 branched from before the humidifier 25 is provided.

Next, the operation of the control device constructed as described above will be described. This control device, which used to determine whether to use the total heat exchanger according to the enthalpy, conventionally focused on the fact that the isenthalpic line and the wet bulb temperature line are substantially parallel lines. The total heat exchanger 7 is controlled using the wet bulb temperature line. That is, the indoor return air wet-bulb temperature sensor 21 provided in the return air path measures the indoor wet-bulb temperature, and the measured value is input to the controller 20. On the other hand, the wet-bulb temperature of the outside air is similarly input to the controller 20 by the outside-air wet-bulb temperature sensor 22. Then, the controller 20 compares the wet-bulb temperature of the outside air with the wet-bulb temperature of the room, and when the wet-bulb temperature of the outside air is higher than the wet-bulb temperature of the room, controls the passage of the outside air through the total heat exchanger 7. To do. That is, the outside air damper 14 is opened and the outside air total heat exchanger bypass circuit damper 15 is closed at all times during both cooling and heating, and the outside air is introduced into the room via the total heat exchanger 7. On the other hand, the wet-bulb temperature of the outside air measured by the outside-air wet-bulb temperature sensor 22 during cooling is the indoor return-air wet-bulb temperature sensor 21.
When the temperature is lower than the wet-bulb temperature of the indoor return air measured by
The outside air damper 14 is closed and the outside air total heat exchanger bypass circuit damper 15 is opened, whereby the outside air is bypassed without passing through the total heat exchanger 7 and introduced into the room.

As described above, according to the air conditioner of the present embodiment, only the wet bulb temperature sensors 21 and 22 need to be installed,
No other temperature sensor or relative humidity sensor is required.

[0016]

According to the present invention having the above-mentioned structure,
Use the wet bulb temperature line that is almost parallel to the isenthalpic line, and always use the total heat exchanger by opening the outside air damper and closing the outside air total heat exchanger detour damper during both cooling and heating. At the same time, when the outside-air wet-bulb temperature measured by the outside-air wet-bulb temperature sensor during cooling is lower than the indoor return-air wet-bulb temperature measured by the indoor return-air wet-bulb temperature sensor, the outside-air damper is closed and the outside-air total heat exchanger bypass circuit is connected. By opening the damper for air, it is possible to bypass the total heat exchanger and introduce the outside air into the room. As a result, the sensor only needs to install the wet-bulb temperature sensor only in the return air path and the outside air path, eliminating the need for multiple types of sensors, and reducing the cost of the device as well as the sensor. The processing method for processing the above information becomes extremely simple.

[Brief description of drawings]

FIG. 1 is an explanatory diagram showing a basic configuration of an embodiment of an air conditioner according to the present invention.

FIG. 2 is an explanatory diagram showing a basic configuration of a conventional air conditioner.

FIG. 3 is a flow sheet showing a conventional air conditioner.

[Explanation of symbols]

 1 Air Supply Fan 2 Inverter 3 Exhaust Fan 4 Outside Air Fan 5 Main Filter 6 Cold / Hot Water Coil 7 Total Heat Exchanger 10 Exhaust Damper 11 Exhaust Duct 12 Outside Air Intake 14 Outside Air Damper 15 Outside Air Total Heat Exchanger Bypass Damper 20 Controller 21 Indoor return air wet-bulb temperature sensor 22 Outdoor air wet-bulb temperature sensor

Claims (1)

[Claims] 1. An air supply fan for supplying air into a room, the air blowing amount of which is variable, and an exhaust fan which exhausts indoor air to the outside.
An outside air introduction fan that introduces outdoor air, a main filter that filters air, a hot and cold water coil, a total heat exchanger, an exhaust damper provided in the exhaust system passage, and an outside air provided in the outside air introduction system passage. With a damper and a damper for the total heat exchanger bypass,
A part of the return air from the air-conditioned room is passed through the exhaust damper, exhausted to the exhaust fan via the total heat exchanger, and the outside air introduced by the outside air fan is used in the total heat exchanger. In the case, it passes through the outside air damper through the total heat exchanger and mixes with the return air, and when the total heat exchanger is not used, the introduced outside air bypasses the total heat exchanger and bypasses the total heat exchanger. An air conditioner that passes through a road damper, is mixed with the return air, is cooled by the cold / hot water coil during cooling, is heated during heating, and supplies the air to the air-conditioned room by the air supply fan. Equipped with an outdoor air wet-bulb temperature sensor that measures the outdoor wet-bulb temperature and an indoor return-air wet-bulb temperature sensor that measures the indoor return-air wet-bulb temperature. Open and close the damper for the bypass circuit of the outside air total heat exchanger At the time of cooling, when the outside air wet-bulb temperature measured by the outside-air wet-bulb temperature sensor is lower than the indoor return-air wet-bulb temperature measured by the indoor return-air wet-bulb temperature sensor, the outside-air damper is closed and the outside air is closed. An air conditioner characterized by opening a damper for the bypass of the total heat exchanger.