JPH10318593A - Control method for air-conditioning device and air-conditioning device - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide an air-conditioning device to simplify constitution of a device and maintain a comfortable living space at an air-conditioning load and at a low operation cost. SOLUTION: An air-conditioning device comprises an outside air route 19, a supply air route 21 connected to an air-conditioning load 1, a return air route 22, an exhaust route 18, and a return air bypass route 29 and further, the supply air route 21 is provided with a cold and hot water coil 4 connected to a cold and hot water piping 34 having a cold and hot water motor-drive valve 32. Further, a filter 9 and a supply air fan 6 are arranged in the supply air route 21 and an exhaust fan 8 in the exhaust route 18. Moreover, an outside air damper 13 is arrange din an outside air route 19, a reflux damper 26 located in the return air bypass route 29, and a control device 36 is provided to effect cooperation control of the supply air fan 6 and the outside air damper 13. Through constitution of two fans of one being the supply air fan 6 and the other the exhaust fan 8, air balance control through which an outside air input amount is equalized to an exhaust gas amount is executed.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an air conditioner control method and an air conditioner that take in a main part of return air from an air conditioner load and mix it with outside air.

[0002]

2. Description of the Related Art FIG.
FIG. 8 is a conceptual configuration diagram of a conventional air conditioner disclosed in Japanese Patent Publication No. 7-No. In the figure, 1 is an air-conditioning load consisting of a living room,
2 is an air conditioner, 3 is a total heat exchanger, 4 is a cold and hot water coil,
5 is a cold / hot water valve, 6 is an air supply fan, 7 is an outside air fan, 8 is an exhaust fan, 9 is a filter, 10 is an air conditioner control panel,
11 is a control panel of the total heat exchanger 3.

[0003] 12 is an exhaust damper, 13 is an outside air damper, 1
4 is a total heat exchange bypass damper, 15 is a return air temperature sensor,
16 is an outside air temperature sensor, and 17 is an indoor temperature setting device.
Also, 18 is an exhaust path, 19 is an outside air path, 20 is a total heat exchange bypass path, 21 is an air supply path, 22 is a return air path, 2
3 is an indoor temperature sensor, 24 is a cold / hot water outgoing pipe, and 25 is a cold / hot water return pipe.

[0004] A conventional air conditioner is configured as described above, and is provided with three blowers, an air supply fan 6, an outside air fan 7 and an exhaust fan 8. In addition, there is an air conditioner in which a return air fan (not shown) is arranged in place of the outside air fan 7 in addition to such a fan arrangement. And the conventional air conditioner is controlled so that the output air volume of the outside air fan 7 and the exhaust fan 8 or the output air volume of the supply air fan 6 and the return air fan becomes the same.

The construction of such an air conditioner increases operating costs, and the same applies to the case where the blower is constituted by three units, namely, an air supply fan 6, an exhaust fan 8 and a return air fan. Also, three dampers are provided: an exhaust damper 12 in an exhaust path 18, an outside air damper 13 in an outside air path 19, and a total heat exchange bypass damper 14 in a total heat exchange bypass path 20. In addition, these dampers play an auxiliary role of adjusting the air volume for the control output of each blower in the air volume control.

FIG. 13 is a conceptual diagram showing another conventional air conditioner using an air path model. In the figure, the same reference numerals as those in FIG. 1 described above denote corresponding parts, 26 is a recirculation damper, 27 is an outside air total heat exchange bypass damper, 28 is an exhaust total heat exchange bypass damper, 29 is a return air bypass path,
Reference numeral 30 denotes an outside air total heat exchange bypass path, reference numeral 31 denotes an exhaust total heat exchange bypass path, reference numeral 32 denotes a chilled / hot water electric valve, reference numeral 33 denotes a supply air temperature sensor, reference numeral 34 denotes a chilled / hot water pipe, and reference numeral 35 denotes a return air humidity sensor.

In a conventional air conditioner configured as shown in FIG. 13, humidity control is performed. That is, an air conditioner provided with the air supply path 21, the outside air path 19, the return air path 22, the exhaust path 18, and the return air bypass path 29 is formed. An outside air total heat exchange bypass path 30 and an exhaust total heat exchange bypass path 31 are provided.
2, outside air damper 13, recirculation damper 26, outside air total heat exchange bypass damper 27, and exhaust total heat exchange bypass damper 28
Is provided.

Then, as described below, the air-conditioning load 1
Humidity is controlled. That is, when the humidity of the return air humidity sensor 35 is equal to or higher than the set value, the opening of the electric motor 32 is adjusted according to the determined operation range. As a result, the amount of dehumidification of the air flow passing through the cold / hot water coil 4 is controlled.

[0009]

In the conventional air conditioner as described above, the conventional air conditioner shown in FIG. 12 is provided with three blowers of an air supply fan 6, an outside air fan 7 and an exhaust fan 8, Also, the exhaust damper 12 and the outside air damper 1
3 and a total heat exchange bypass damper 14 are provided. For this reason, there was a problem that energy saving was difficult and the operating cost of the air conditioner increased. FIG.
When humidity control is performed as in other conventional air conditioners, the supply air temperature may decrease more than necessary,
Further, due to humidity control, the load on the heat source device supplying cold water increases.

The present invention has been made in order to solve such a problem, and has a simple device configuration, and can maintain a comfortable living space under an air-conditioning load at a low operating cost. It is an object to obtain a control method of an air conditioner and an air conditioner.

[0011]

In an air conditioner according to the present invention, an outside air path, an air supply path communicating with the outside air path and connected to an air conditioning load, and a return air connected to the air conditioning load are provided. A return path, an exhaust path communicating with the return path, a connection section between the outside air path and the supply path, and a return air bypass path connecting the connection sections of the return path and the exhaust path, and a supply path. A hot / cold water coil to which a hot / cold water pipe having a hot / cold hot water electric valve is connected; a filter provided in the air supply path and arranged between the return air bypass path and the cold / hot water coil; and a filter provided in the air supply path An air supply fan arranged between the chilled / hot water coil and the air conditioning load, one of both an exhaust fan provided in the exhaust path and a return air fan provided in the return air path, and an outside air provided in the outside air path. Damper and return air bypass And reflux damper provided for mixing the return air from the outside air and return air bypass path from outside air path, the air supply fan, one of the two, control unit and is provided for coordinated control of the outside air damper and reflux damper.

Further, in the air conditioner according to the present invention, a total heat exchanger connected to the outside air path and the exhaust path, and an outside air total heat exchange bypass path provided in the outside air path and bypassing the total heat exchanger are provided. An exhaust total heat exchange bypass path provided in the exhaust path and bypassing the total heat exchanger, an exhaust damper provided in the exhaust path, and an external air total heat exchange bypass damper provided in the external air total heat exchange bypass path, An exhaust total heat exchange bypass damper provided in the exhaust total heat exchange bypass path is provided.

Further, in the air conditioner according to the present invention, an outside air wind speed sensor provided on the outside air passage and an exhaust wind speed sensor provided on the exhaust passage are provided.

In the method for controlling an air conditioner according to the present invention, an outside air path, an air supply path communicating with the outside air path and connected to an air conditioning load, and a return air path connected to the air conditioning load are provided. And an exhaust path communicating with the return air path,
A return air bypass path connecting the connection sections of the outside air path and the air supply path and a connection section of the return air path and the exhaust path, and a cold / hot water pipe provided in the air supply path and having a cold / hot water electric valve were connected. A chilled / hot water coil, a filter provided in the air supply path and arranged between the return air bypass path and the chilled / hot water coil, and a supply air supply provided in the air supply path and arranged between the chilled / hot water coil and the air conditioning load. Air fan, one of both an exhaust fan provided in the exhaust path and a return air fan provided in the return air path, an outside air damper provided in the outside air path, and an outside air path provided in the return air bypass path. A recirculation damper that mixes the outside air with the return air from the return air bypass path, and controls the supply air flow rate by controlling the rotation speed of the supply fan and the cooling / heating water amount control by controlling the opening / closing proportion of the cooling / heating water electric valve to control the air conditioning load. Internal temperature Is maintained at a set value, and one of the above two is rotationally controlled by a control operation to make the outside air intake amount and the exhaust amount the same amount, and the exhaust amount by the output of one of the two is set to a predetermined value, and provided in the path. The opening degree of the damper is proportionally controlled to make the outside air intake amount equal to the exhaust amount.If the outside air intake amount and the exhaust amount do not become the same amount, the opening degree of the recirculation damper is proportionally controlled in the direction to be reduced. You.

In the method for controlling an air conditioner according to the present invention, an outside air path, an air supply path communicating with the outside air path and connected to an air conditioning load, and a return air path connected to the air conditioning load are provided. And an exhaust path communicating with the return air path,
A return air bypass path connecting the connection sections of the outside air path and the air supply path and a connection section of the return air path and the exhaust path, and a cold / hot water pipe provided in the air supply path and having a cold / hot water electric valve were connected. A chilled / hot water coil, a filter provided in the air supply path and arranged between the return air bypass path and the chilled / hot water coil, and a supply air supply provided in the air supply path and arranged between the chilled / hot water coil and the air conditioning load. Air fan, one of both an exhaust fan provided in the exhaust path and a return air fan provided in the return air path, an outside air damper provided in the outside air path, and an outside air path provided in the return air bypass path. A reflux damper that mixes the outside air with the return air from the return air bypass path, a total heat exchanger connected to the external air path and the exhaust path, and a total heat exchange that is provided in the external air path and bypasses the total heat exchanger. Bypass path and exhaust path An exhaust total heat exchange bypass path provided in the exhaust path, bypassing the total heat exchanger, an exhaust damper provided in the exhaust path, an external air total heat exchange bypass damper provided in the external air total heat exchange bypass path, and an exhaust total heat An exhaust total heat exchange bypass damper provided in the exchange bypass path,
The exhaust fan is rotated at a predetermined exhaust volume by controlling the rotation speed of the exhaust fan by controlling the air intake volume and the exhaust volume to be equal, and the external air intake volume is exhausted by proportionally controlling the degree of opening of the damper provided in the path. If the outside air intake amount and the exhaust amount do not become the same amount, the proportional control is performed in the direction in which the opening degree of the recirculation damper is reduced.

Also, in the air conditioner according to the present invention, a cold / hot water coil bypass path provided in the air supply path and bypassing the cold / hot water coil, and a cold / hot water coil bypass damper provided in the cold / hot water coil bypass path Are provided.

In the air conditioner according to the present invention, an air supply temperature sensor provided in the air supply path and a return temperature / humidity sensor provided in the return air path are provided.

Further, in the air conditioner according to the present invention, an outside air path, an air supply path communicating with the outside air path and connected to the air conditioning load, a return air path connected to the air conditioning load, and a return path are provided. An exhaust path communicating with the air path, a return air bypass path connecting the connection section between the outside air path and the air supply path, and a connection section between the return air path and the exhaust path, and a cold / hot water electric valve provided in the air supply path A chilled / hot water coil connected to a chilled / hot water pipe having a filter, a filter provided in the air supply path and arranged between the return air bypass path and the chilled / hot water coil, and a chilled / hot water coil and air provided in the air supply path A supply fan disposed between the harmony loads, one of an exhaust fan provided in the exhaust path and a return air fan provided in the return path, an outside air damper provided in the outside air path, and a return air Provided in the bypass path A return damper that mixes the outside air from the air path and the return air from the return air bypass path, a cold / hot water coil bypass path that is provided in the air supply path and bypasses the cold / hot water coil, and is provided in the cold / hot water coil bypass path. A cold / hot water coil bypass damper is installed, and the opening of the cold / hot water coil bypass damper is proportionally controlled by the return air humidity from the air-conditioning load to adjust the bypass air volume of the cold / hot water coil bypass path, and the air volume passing through the cold / hot water coil Is adjusted to control the dehumidification amount to a predetermined value.

[0019]

BEST MODE FOR CARRYING OUT THE INVENTION

Embodiment 1 FIG. 1 and 2 are views showing an example of an embodiment of the present invention. FIG. 1 is a conceptual configuration diagram shown by an air path model, and FIG. 2 explains control of an air conditioner by an air path model of FIG. FIG. In the figure,
1 is an air conditioning load consisting of a room, 19 is an outside air path, 21
Is an air supply path connected to the air-conditioning load 1 in communication with the outside air path 19, 22 is a return air path connected to the air-conditioning load 1,
Reference numeral 18 denotes an exhaust passage communicating with the return air passage 22.

Reference numeral 29 denotes a return air bypass path,
And the connection of the supply path 21 and the connection of the return path 22 and the exhaust path 18 are connected to each other. Reference numeral 4 denotes a cold / hot water coil, which is connected to a cold / hot water pipe 34 provided in the air supply path 21 and having a cold / hot water electric valve 32. 9 is a filter,
The air supply path 21 is provided between the return air bypass path 29 and the cold / hot water coil 4.

Reference numeral 6 denotes an air supply fan, which is provided in the air supply path 21 and disposed between the cold / hot water coil 4 and the air conditioning load 1. Reference numeral 8 denotes an exhaust fan provided in an exhaust path 18;
Reference numeral 3 denotes an outside air damper provided in the outside air path 18, and reference numeral 26 denotes a recirculation damper, which is provided in the return air bypass path 29 and mixes outside air from the outside air path 19 and return air from the return air bypass path 29. A control device 36 is connected to air conditioning equipment such as the air supply fan 6, the exhaust fan 8, the outside air damper 13, and the recirculation damper 26.

In the air conditioner configured as described above, two fans, an air supply fan 6 and an exhaust fan 8, are provided as blowers. Further, two dampers, an outside air damper 13 and a recirculation damper 26, are provided. Then, the return air from the air-conditioning load 1 passes through the return air path 22, and a part of the return air passes through the return damper 26 of the return air bypass path 29, and is mixed with the outside air introduced from the outside air path 19.

After passing through the filter 9 and the cold / hot water coil 4, the air is supplied to the air conditioning load 1 by the air supply fan 6, and the air conditioning load 1 is air-conditioned. The other part of the return air from the air-conditioning load 1 is exhausted outside by the exhaust fan 8 through the exhaust path 18. The outside air is taken in from the outside air path 19 through the outside air damper 13 and mixed with the return air from the return air bypass path 29.

Then, the controller 36 controls the air balance of the air conditioner as shown in the flowchart of FIG. That is, in step 101, the outside air intake amount is set based on the return air temperature and the CO2 concentration, and the routine proceeds to step 102, where the exhaust amount is set, and the exhaust fan is rotated at a rotational speed so that the exhaust amount becomes the outside air intake set amount. Controlled.

Next, the routine proceeds to step 103, where the exhaust amount is not the external air intake amount, the process returns to step 102, and if the exhaust amount is the external air intake amount, the process proceeds to step 104, where the first external air amount is set and the exhaust air volume is set. The proportional control of the outside air damper opening angle is performed so that the air volume becomes the same as the above. Then, Step 105
The process proceeds to step 110 if the outside air amount = displacement amount, and proceeds to step 106 if the outside air amount = displacement amount. If the outside air damper is not fully opened in step 106, the process returns to step 104, and if it is fully open, the process proceeds to step 107.

In step 107, the second outside air amount is set, and proportional control of the opening angle is performed from the fully opened recirculation damper so that the amount of air becomes the same as the exhaust air amount. And step 1
In step 08, if the displacement is outside the set value, the process returns to step 102 to reset the displacement. If the displacement does not deviate from the set value, the process proceeds to step 109. If the outside air amount is not the exhaust amount in step 109, the process returns to step 107. If the outside air amount is the exhaust amount, step 1 is performed.
Proceeding to 10, the air balance control ends.

In short, in order to keep the room temperature at the set temperature, the supply air temperature by the supply fan 6 and the flow rate of the cold / hot water to the cold / hot water coil 4 by the cold / hot water electric valve 32 are controlled to control the supply air temperature. Also, the outside air intake amount is set according to the return air temperature, the CO ₂ concentration, etc., the rotation speed of the exhaust fan 8 is controlled to exhaust the same amount as the outside air intake set amount, and the opening angle of the outside air damper 13 is adjusted. The same amount of outside air as the displacement is taken in by proportional control.
If the outside air intake amount and the exhaust amount are not the same even when the outside air damper 13 is fully opened, the opening angle is proportionally controlled in the direction to close the recirculation damper 26.

If, after the recirculation damper 26 is controlled, the amount of exhaust gas, which is the same as the set amount of outside air intake, changes, the rotation speed of the exhaust fan 8 is controlled by feeding back to the setting of the amount of exhaust gas. The above is the operation according to the control flow shown in FIG. 2, and is the air balance control flow when it is assumed that the return air temperature and the CO ₂ concentration are constant.

The return air temperature changes depending on the supply air temperature and the indoor load of the air conditioning load 1. Therefore, the control is performed by utilizing the fact that the outside air intake amount set by the return air temperature can be freely changed within an allowable range. That is, even if the outside air damper 13 is fully opened during the air balance control,
If the intake amount of outside air and the exhaust amount do not become the same amount, the supply air temperature is lowered before controlling the recirculation damper 26 in the closing direction.

As a result, the set amount of outside air intake is reduced by lowering the return air temperature, and the amount of outside air intake can be made equal to the amount of exhaust air only by controlling the outside air damper 13. That is, the reflux damper 26 is kept fully open, and the state where the pressure loss in the air conditioner is kept low can be maintained. As described above, the configuration uses two blowers, the air supply fan 6 and the exhaust fan 8, and performs the air balance control to make the amount of outside air intake and the amount of exhaust air equal according to the flowchart shown in FIG. .

As a result, it is possible to obtain an air conditioner and a method of controlling the air conditioner, which can save energy and reduce operating costs. Further, since the number of blowers is reduced by one compared with the conventional configuration, the space can be saved correspondingly and the equipment cost can be reduced. It should be noted that even if the air conditioner is not an air path model shown in FIG. 1 but an actual air conditioner, or an air conditioner in which an air supply path and a return air path are integrally formed, FIGS.
The operation in the embodiment can be obtained.

Embodiment 2 FIG. FIG. 3 is a view showing an example of another embodiment of the present invention, and is a conceptual configuration diagram shown by an air path model. An air conditioner other than that of FIG. 3 is configured similarly to the embodiment of FIGS. 1 and 2 described above. In the figure, the same reference numerals as those in FIGS. 1 and 2 denote corresponding parts, and reference numeral 37 denotes a return air fan provided in the return air passage 22.

In the air conditioner configured as described above, two air supply fans 6 and a return air fan 37 are provided as blowers. Further, two dampers, an outside air damper 13 and a recirculation damper 26, are provided. Then, the return air from the air-conditioning load 1 drawn by the return air fan 37 passes through the return air path 22, and a part thereof is returned to the return air bypass path 29.
, And is mixed with the outside air introduced from the outside air path 19.

After passing through the filter 9 and the cold / hot water coil 4, the air is supplied into the air conditioning load 1 by the air supply fan 6, whereby the air conditioning load 1 is air-conditioned. The other part of the return air from the air-conditioning load 1 drawn by the return air fan 37 is exhausted to the outside through the exhaust path 18 as it is. The outside air is taken in from the outside air path 19 through the outside air damper 13 and mixed with the return air from the return air bypass path 29.

Then, the control device 36 controls the air balance of the air conditioner. That is, the amount of air supplied by the air supply fan 6 to set the room temperature to the set temperature,
The supply air temperature is controlled by adjusting the flow rate of the cold / hot water to the cold / hot water coil 4 by the cold / hot water electric valve 32. Air conditioning load 1
The rotation speed of the return air fan 37 is controlled so that the amount of air supplied to the fan and the amount of return air are equal.

This is to maintain the inside of the air conditioning load 1 at about atmospheric pressure, and it is necessary to return the same amount of air supplied by the air supply fan 6 to the air conditioner by the return air fan 37. . Therefore, the air supply fan 6 and the return air fan 37 are operated with the same output using fans of substantially the same capacity. It should be noted that the actual control of the amount of outside air and the amount of exhaust is performed.

When the recirculation damper 26 is fully opened, the amount of outside air and the amount of exhaust are the minimum required. When the damper 26 is fully closed, the amount of air is maximized in the full outside air operation, and the air inside the air-conditioning load 1 is all fresh. That is, by controlling the opening angle of the recirculation damper 26 proportionally, it is possible to control from the required minimum amount to the maximum air volume. However, the outside air damper 13 at this time remains fully open.

Here, when the set flow rate of the outside air amount and the exhaust air amount is set to be smaller than the required minimum amount when the recirculation damper 26 is fully opened, the opening angle is proportionally controlled in the direction to close the outside air damper 13. . However, the return air damper 26 at this time is fully opened. In order to maintain the inside of the air conditioning load 1 at about atmospheric pressure, the supply air fan 6 and the return air fan 3
7 are controlled so that the respective air volumes are equal.

However, at this time, there is a case where there is always leaked air from the air-conditioning load 1 and forced exhaust is performed by a ventilation fan (not shown) or the like. At this time, it is necessary to adjust the air volume so that the inside of the air conditioning load 1 does not have an unpleasant indoor pressure. For this reason, the air supply fan 6
And the return air fan 37 does not perform the same output operation.

The opening angle of the outside air damper 13 is proportionally controlled so that the outside air amount and the exhaust amount are equal, and the opening angle of the return air damper 26 is proportionally controlled by the outside air amount and the exhaust amount. Adjust by. As a result, the internal pressure in the air-conditioning load 1 can be maintained at about the atmospheric pressure while securing the required outside air intake amount.

As described above, in the configuration using two blowers, the air supply fan 6 and the return air fan 37,
The air balance control, particularly the recirculation damper 26, is performed mainly from the necessity of making the intake amount of the outside air and the exhaust amount the same when the air leakage from the air conditioning load 1 is considered. As a result, it is possible to obtain an air conditioner and a method for controlling the air conditioner, which can save energy and reduce operating costs. Further, since the number of blowers is reduced by one compared with the conventional configuration, the space can be saved correspondingly and the equipment cost can be reduced.

Embodiment 3 4 to 6 also show an example of another embodiment of the present invention. FIG. 4 is a conceptual configuration diagram shown by an air path model, and FIG. 5 is a control of an air conditioner using the air path model of FIG. Flowchart for explaining FIG.
5 is a flowchart illustrating another control of the air conditioner using the air path model in FIG. 4. The air conditioner is configured similarly to the above-described embodiment of FIGS. 1 and 2 except for FIGS.

In the figure, the same reference numerals as those in FIGS. 1 and 2 denote corresponding parts. 3 is a total heat exchanger, 27 is an outside air total heat exchange bypass damper, 28 is an exhaust total heat exchange bypass damper, 30
Is an outside air total heat exchange bypass route that bypasses the total heat exchanger 3,
Reference numeral 31 denotes an exhaust total heat exchange bypass route that bypasses the total heat exchanger 3.

In the air conditioner configured as described above, two air supply fans 6 and an exhaust fan 8 are provided as blowers. Also, five dampers are provided: an exhaust damper 12, an outside air damper 13, a recirculation damper 26, an outside air total heat exchange bypass damper 27, and an exhaust total heat exchange bypass damper 28. Then, the return air from the air-conditioning load 1 passes through the return air path 22, and a part of the return air passes through the return damper 26 of the return air bypass path 29, and is mixed with the outside air introduced from the outside air path 19.

Then, the air passes through the filter 9 and the cold / hot water coil 4, and is supplied into the air conditioning load 1 by the air supply fan 6, whereby the air conditioning in the air conditioning load 1 is performed. In the other part of the return air from the air-conditioning load 1, when the exhaust damper 12 is open and the exhaust total heat exchange bypass damper 28 is closed, the exhaust heat is exhausted by the total heat exchanger 3 and the exhaust damper 12 is removed. After that, the air is exhausted to the outside through the exhaust path 18 by the exhaust fan 8.

When the exhaust damper 12 is closed and the exhaust total heat exchange bypass damper 28 is open, the exhaust heat is not exhausted by the total heat exchanger 3 and the exhaust total heat exchange bypass path 31 causes the exhaust total heat exchange. The air is exhausted outside through the exhaust path 18 by the exhaust fan 8 via the bypass damper 28.

When the outside air is taken in from the outside air path 19 and the outside air damper 13 is opened and the outside air total heat exchange bypass damper 27 is closed, the exhaust heat is recovered by the total heat exchanger 3 and the return air is returned. It is mixed with a part of the return air from the bypass path 29. When the outside air damper 13 is closed and the outside air total heat exchange bypass damper 27 is open, the total heat exchanger 3
The exhaust gas is not recovered, and is mixed with a part of the return air from the return air bypass passage 29 through the outside air total heat exchange bypass passage 30 through the outside air total heat exchange bypass damper 27.

In response to the above blast, the controller 36
As a result, the control of the air conditioner is performed as shown in the flowchart of FIG. That is, the air supply amount is set in step 201, and the rotation speed of the air supply fan is controlled so that the required (set) air amount is obtained. And step 202
If the air supply amount is not satisfied, the process returns to step 201. If the air supply amount is satisfied, the process proceeds to step 203, where the exhaust amount is set, and the rotation speed of the exhaust fan is controlled so as to attain the required (set) air volume.

Next, the routine proceeds to step 204. If the displacement is not satisfied, the routine returns to step 203. If satisfied, the routine proceeds to step 205. If not, the process proceeds to step 209. And step 20
In 6, the second outside air amount is set, and proportional control of the opening angle is performed from the fully opened recirculation damper so that the air amount becomes the same as the exhaust air amount.

Then, the routine proceeds to step 207, where the outside air amount =
If it is the exhaust amount, the process proceeds to step 211, and if the external air amount is not the exhaust amount, the process proceeds to step 208. If the supply amount or the exhaust amount does not deviate from the set value in step 208, the process returns to step 206.
Then, the air supply amount is reset and the flow returns to step 203 to reset the exhaust amount.

In step 209, the first outside air amount is set, and the proportional control of the opening angle of the outside air damper or the outside air total heat exchange bypass damper is performed so that the air amount becomes the same as the exhaust air amount. Next, the process proceeds to step 210, where the outside air amount is not the exhaust amount, the process returns to step 205, and if the outside air amount is the exhaust amount, the process proceeds to step 211, and the air volume of each room, that is, the air conditioning load is determined. In short, the air supply fan 6 is controlled so that the air supply amount is set according to the air supply temperature and the room temperature.
Is controlled. Further, the rotation speed of the exhaust fan 8 is controlled such that the intake amount of outside air and the exhaust amount set by the return air CO ₂ concentration are equal.

When the exhaust heat recovery is performed by the total heat exchanger 3, the outside air damper 13 is determined. When the exhaust heat recovery is not performed, it is determined whether the opening degree of the external air total heat exchange bypass damper 27 is fully opened. Otherwise, the outside air damper 13 or the outside air total heat exchange bypass damper 27 is set so that the outside air amount becomes equal to the exhaust amount.
Is proportionally controlled.

When the outside air damper 13 or the outside air total heat exchange bypass damper 27 is fully opened, the opening angle is proportionally controlled from the fully opened to the closed state so that the recirculation damper 26 is closed so that the amount of outside air becomes equal to the exhaust amount. After the recirculation damper 26 is operated, when the supply amount or the exhaust amount is out of the allowable range of the set value, the supply amount and the exhaust amount are reset.

In addition, other control of the air conditioner is performed by the control device 36 as shown in the flowchart of FIG. That is, step 30
In 1, the rotation speed of the air supply fan is controlled so as to achieve the air supply temperature setting request (set) air volume, and the opening of the cold / hot water motor-operated valve is controlled so as to reach the air supply set temperature. And
Proceed to step 302.

In step 302, if the supply air temperature is not satisfactory, the flow returns to step 301, and if it is satisfied, the flow proceeds to step 303, in which the rotation speed of the exhaust fan is controlled so as to attain the air volume setting request (setting) air volume. You. Next, proceeding to step 304, if the displacement is not satisfactory, step 3
Returning to step 03, if it is satisfied, the process proceeds to step 305, where the proportional control of the opening angle of the outside air damper or the outside air total heat exchange bypass damper is performed so as to be the same as the first outside air amount set exhaust air amount.

Then, the routine proceeds to step 306, where the outside air amount =
If it is the exhaust amount, the process proceeds to step 307, and the air volume of each room, that is, the air conditioning load is determined. Step 306
If not, the flow proceeds to step 308.
If the outside air damper or the outside air total heat exchange bypass damper is not fully opened in step 308, the process returns to step 305,
If it is fully opened, the process proceeds to step 309, where air volume adjustment or temperature adjustment is performed. Then, the flow proceeds to step 310 for adjusting the air volume.

In step 310, proportional control of the opening angle is performed from the fully opened recirculation damper so that the air flow becomes equal to the second external air flow set exhaust air flow. Next, the process proceeds to step 311, and if the outside air amount = the exhaust amount, the process proceeds to step 307. If the outside air amount = the exhaust amount, the process proceeds to step 312.
If the supply air temperature or the exhaust air amount does not deviate from the set value in step 312, the flow returns to step 309. If the air supply temperature or the exhaust air amount does not deviate from the set value, the flow returns to step 301 to reset the air supply amount and return to step 303 to exhaust air. The quantity is reset.

In step 309, the process proceeds to step 313 for temperature adjustment. The supply air temperature is reset. The supply air temperature is reset to a lower value, and the required outside air amount for lowering the return air temperature is reduced to an allowable range and balanced. . Next, the flow returns to step 301 to reset the supply amount, and returns to step 303 to reset the exhaust amount. In short, the rotation speed of the air supply fan 6 is controlled such that the air supply amount and the air supply set temperature are set based on the air supply temperature and the room temperature. In order to control the amount of cold and hot water, a cold and hot water electric valve 32 is provided.
Is proportionally controlled.

Further, the rotation speed of the exhaust fan 8 is controlled such that the intake amount of outside air and the exhaust amount set by the return air temperature become equal. The opening angle of the outside air damper 13 when exhaust heat recovery is performed by the total heat exchanger 3 and the opening angle of the outside air total heat exchange bypass damper 27 when exhaust heat recovery is not performed so that the external air amount becomes equal to the exhaust amount. Is proportionally controlled. At this time, if the outside air amount does not become the required value even if the outside air amount does not become the same amount as the exhaust amount and the outside air damper 13 or the outside air total heat exchange bypass damper 27 is fully opened, the following two adjustment methods are available. .

That is, when adjusting the air flow, the opening angle is proportionally controlled from the fully opened state to the closed state so that the outside air amount becomes equal to the exhaust amount. In the case of temperature control, the return air temperature is lowered by resetting the supply air temperature to a lower value, the required outside air amount is reduced to within an allowable range, and the air temperature is reset based on the exhaust air amount.

As described above, the configuration using the two fans of the air supply fan 6 and the exhaust fan 8 includes the total heat exchanger 3, the outside air total heat exchange bypass path 30, the outside air total heat exchange bypass damper 27, An exhaust total heat exchange bypass path 31 and an exhaust total heat exchange bypass damper 28 are provided.

The external air total heat exchange bypass damper 27 including air balance control for the air conditioner having the above-described configuration to make the intake amount of the outside air and the exhaust amount equal to each other according to the flowcharts shown in FIGS. By performing the control by the exhaust total heat exchange bypass damper 28, the exhaust heat action is promoted, and the cooling operation by the outside air when the air conditioning load is small is performed. Accordingly, an air conditioner and a control method of the air conditioner that can reduce the power of the blower, can save energy, and can reduce the operating cost can be obtained.

Embodiment 4 FIG. 7 is also a diagram showing an example of another embodiment of the present invention, and is a conceptual configuration diagram shown by an air path model. In addition, FIG. 4 to FIG.
An air conditioner is configured similarly to the embodiment.
In the figure, the same reference numerals as those in FIGS.
Reference numeral 8 denotes an outside air speed sensor provided in the outside air path 19, and reference numeral 39 denotes an exhaust air speed sensor provided in the exhaust path.

In the air conditioner constructed as described above, except that the outside air speed sensor 38 and the exhaust air speed sensor 39 for controlling the air volume are arranged, FIGS.
In the same manner as in the embodiment, an air path is formed and similar air is blown. Then, the controller 36 controls the air conditioner as shown in the flowchart of FIG.

That is, the rotation speed of the air supply fan 6 is controlled so that the air supply amount is set according to the air supply temperature and the room temperature. Further, the rotation speed of the exhaust fan 8 is controlled such that the intake amount of outside air and the exhaust amount set by the return air CO ₂ concentration become the same amount, and the feedback control based on the value of the exhaust wind speed sensor 39 is performed.

When the exhaust heat recovery is performed by the total heat exchanger 3, the outside air damper 13 is determined. When the exhaust heat recovery is not performed, it is determined whether the opening degree of the external air total heat exchange bypass damper 27 is fully opened. Otherwise, the outside air damper 13 or the outside air total heat exchange bypass damper 27 is set so that the outside air amount becomes equal to the exhaust amount.
Is proportionally controlled. Then, the outside air wind speed sensor 38
Feedback control based on the value is performed.

When the outside air damper 13 or the outside air total heat exchange bypass damper 27 is fully opened, the opening angle is proportionally controlled in the direction from the fully opened to the closed state of the recirculation damper 26 so that the amount of outside air becomes equal to the exhaust amount. Feedback control based on the value of the outside air wind speed sensor 38 is performed. Next, after the recirculation damper 26 is operated, when the supply amount or the exhaust amount is out of the allowable range of the set value, the supply amount and the exhaust amount are reset.

Further, other control of the air conditioner is performed by the control device 36 as shown in the flowchart of FIG. That is, the rotation speed of the air supply fan 6 is controlled so that the air supply amount and the air supply set temperature are set based on the air supply temperature and the room temperature. Further, in order to control the amount of cold and hot water, the valve opening of the cold and hot water electric valve 32 is proportionally controlled.

Further, the rotation speed of the exhaust fan 8 is controlled so that the intake amount of outside air and the exhaust amount set by the return air temperature become equal, and the feedback control is performed by the value of the exhaust wind speed sensor 39. The opening angle of the outside air damper 13 when exhaust heat recovery is performed by the total heat exchanger 3 and the opening angle of the outside air total heat exchange bypass damper 27 when exhaust heat recovery is not performed so that the external air amount becomes equal to the exhaust amount. Is proportionally controlled. Further, feedback control based on the value of the outside air wind speed sensor 38 is performed.

At this time, the amount of outside air does not become the same as the amount of exhaust, and the outside air damper 13 or the outside air total heat exchange bypass damper 27
If the outside air volume does not reach the required value even if
There are the following two adjustment methods. That is, when adjusting the air flow, the opening angle is proportionally controlled in the direction from the fully opened to the closed state so that the recirculation damper 26 is closed so that the outside air amount becomes equal to the exhaust amount. Further, feedback control based on the value of the outside air wind speed sensor 38 is performed.

When the temperature is to be adjusted, the return air temperature is lowered by resetting the supply air temperature to a lower value, and the required outside air amount is reduced to within an allowable range, and reset based on the exhaust air amount. As described above, the total heat exchanger 3, the outside air total heat exchange bypass path 30, the outside air total heat exchange bypass damper 27, the exhaust total heat An exchange bypass path 31 and an exhaust total heat exchange bypass damper 28 are provided.

With respect to the air conditioner thus configured, an outside air wind speed sensor 38 and an exhaust wind speed sensor including air balance control for equalizing the amount of intake of outside air and the amount of exhaust according to the flowcharts shown in FIGS. By performing the control by 39, the exhaust heat action is promoted, and the cooling operation by the outside air when the air conditioning load is small is performed. Accordingly, an air conditioner and a control method of the air conditioner that can reduce the power of the blower, can realize energy saving, and can reduce the operation cost can be obtained.

Embodiment 5 FIG. 8 is also a diagram showing an example of another embodiment of the present invention, and is a conceptual configuration diagram shown by an air path model. In the figure, 1 is an air conditioning load consisting of a living room, 2 is an air conditioner, 3 is a total heat exchanger, 4 is a cold / hot water coil, 5 is a cold / hot water valve, 6 is an air supply fan, 8 is an exhaust fan, and 9 is an exhaust fan. The filter 10 is an air conditioner control panel, 12 is an exhaust damper, 13 is an outside air damper, 27 is an outside air total heat exchange bypass damper, and 28 is an exhaust total heat exchange bypass damper.

26 is a reflux damper, 40 is a cold / hot water coil bypass damper, 35 is a return temperature / humidity sensor, 41 is CO ₂
Concentration sensor, 33 is an air supply temperature sensor, 23 is an indoor temperature sensor, 17 is an indoor temperature setter, 16 is an outside air temperature sensor,
38 is an outside air wind speed sensor, 39 is an exhaust air speed sensor, 21 is an air supply route, 19 is an outside air route, 22 is a return air route, 18 is an exhaust route, 30 is an external air total heat exchange bypass route, and 31 is an exhaust total heat exchange bypass route. The path 34 is a cold / hot water pipe.

In the air conditioner configured as described above, the air conditioner load 1 is air-conditioned to the temperature set by the room temperature setter 17. The air conditioner 2 is provided with a cold / hot water coil 4 connected to a cold / hot water pipe 34 having a cold / hot water valve 5.
6 and a cold / hot water coil bypass damper 40 are provided. Further, the supply air temperature sensor 33 and the indoor temperature sensor 2
3. A return temperature / humidity sensor 35 and a CO ₂ concentration sensor 41 are provided.

Further, a total heat exchanger 3 for utilizing exhaust heat from the return air path 22 is provided, and an exhaust damper 12 and an exhaust path 18 are provided. The exhaust total heat exchange bypass path 31 includes an exhaust total heat exchange bypass damper 2.
8, an exhaust fan 8 is provided. In addition, outside air route 1
An external air damper 13 is provided at 9, and the exhaust heat exchange is performed by the total heat exchanger 3 to reach an air supply path 21.

In the outside air total heat exchange bypass path 30, an outside air total heat exchange bypass damper 27 is provided to reach the air supply path 21. Then, air blowing as described below is performed. That is, the return air from the air conditioning load 1 passes through the filter 9 and the return damper 26 and is cooled or heated by the cold / hot water coil 4 by the air conditioner 2. Then, the air is sent to the air conditioning load 1 by the air supply fan 6 to perform air conditioning.

A cold / hot water pipe 4 connected via a cold / hot water valve 5 is connected to a cold / hot water coil 4 for cooling or heating the air supply.
4 is supplied with cold and hot water from a heat source device (not shown). Further, the air conditioner 2 is provided with a return air path 22 for discharging a part of the return air to the outside of the air-conditioning load 1 after passing the filter 9, and the discharged return air uses exhaust heat. After passing through the total heat exchanger 3, the exhaust gas passes through the exhaust heat damper 12 and is discharged out of the air conditioning load 1 by the exhaust fan 8.

The introduced outside air is supplied to the outside air damper 13.
, Flows into the total heat exchanger 3 for exhaust heat recovery, and reaches the air supply path 21. In the cooling / heating operation in the normal period, the outside air damper 13 and the exhaust damper 12 are opened, and the outside air and the exhaust gas respectively pass through the total heat exchanger 3,
Exhaust heat is used between the outside air and the exhaust air. However, in the case of a cooling operation under conditions such as an intermediate period, an operation is performed in which the total heat exchanger 3 is bypassed without using waste heat.

In such a case, the outside air damper 13 and the exhaust damper 12 are fully closed, and the outside air total heat exchange bypass damper 27 and the exhaust total heat exchange bypass damper 28 are opened. Accordingly, the introduced outside air passes from the outside air path 19 to the outside air total heat exchange bypass path 30, and reaches the air supply path 21 via the outside air total heat exchange bypass damper 27. A part of the return air is discharged from the return air path 22 to the outside of the air conditioning load 1 by the exhaust fan 8 through the exhaust total heat exchange bypass path 31 via the exhaust total heat exchange bypass damper 28 and the exhaust fan 8.

The control of the air conditioner 2 is performed by an operation command from the air conditioner control panel 10. That is,
Supply air temperature sensor 33 in the air conditioner control panel 10, the indoor temperature setter 17, the indoor temperature sensor 23, air temperature and humidity sensor 35, CO ₂ concentration sensor 41 instead, the outside air temperature sensor 16, outside air wind velocity sensor 38 and the exhaust wind speed sensor 39 are connected. Then, the following control is performed by a control signal from the air conditioner control panel 10.

That is, the supply fan 6 and the exhaust fan 8
Is controlled to a rotation speed corresponding to the air conditioning load. And about the outside air damper 13 and the exhaust damper 12, the air flow balance control by the damper opening according to the outside air intake amount in the normal period is performed. Also, the outside air total heat exchange bypass damper 2
7. Regarding the exhaust total heat exchange bypass damper 28, the air flow balance control is performed by the damper opening according to the outside air intake amount in the middle period.

Further, the recirculation damper 26 performs an auxiliary operation of air volume balance control according to the opening angle, and the cold / hot water coil bypass damper 40 performs humidity control during cooling operation. The cold / hot water valve 5 proportionally controls the bubble opening in accordance with the load in the air-conditioning load 1. The air conditioner configured as described above is operated by such control.

Further, another control described below is performed on the air conditioner. That is, the frequency of the air supply fan 6 is controlled via the inverter by the required airflow signal according to the load from the air conditioner control panel 10. Also,
The frequency of the exhaust fan 8 is controlled via the inverter by the required exhaust signal from the air conditioner control panel 10 in accordance with the difference between the return air CO ₂ concentration and the return air temperature and the set temperature, that is, the outside air intake signal. Feedback control based on the exhaust wind speed sensor 39 value is performed.

The outside air damper 13 and the outside air total heat exchange bypass damper 27 have different operating conditions, but have the same control contents, and both are subjected to feedback control by an outside air wind speed sensor 38. In the normal period, the opening angle of the outside air damper 13 in accordance with the outside air intake signal from the air conditioner control panel 10, that is, the exhaust signal, is proportionally controlled via a mod roll motor. At this time, the outside air total heat exchange bypass damper 27 is fully opened.

Further, under conditions such as the intermediate period, the outside air total heat exchange bypass damper 27 is similarly proportionally controlled, and the outside air damper 13 is fully opened. Further, the operation conditions of the exhaust damper 12 and the exhaust total heat exchange bypass damper 28 are different, but the control contents are the same. In the normal period, the exhaust damper 12 is fully opened by the open signal from the air conditioner control panel 10, and the exhaust The heat exchange bypass damper 28 is fully closed by the close signal.

Then, under conditions such as the interim period, the exhaust total heat exchange bypass damper 28 is fully opened by the open signal, and the exhaust damper 12 is fully closed by the close signal. Although the recirculation damper 26 remains fully open in the basic operation, the outside air damper 1
3 or when the outside air total heat exchange bypass damper 27 is fully opened but the required outside air intake from the air conditioner control panel 10 is not reached, the recirculation damper 26 is transmitted from the air conditioner control panel 10 via a mod roll motor. Is proportionally controlled in the direction of decreasing the opening of the.

The cooling / heating water coil bypass damper 40 is operated by the dehumidification signal from the air conditioner control panel 10 during the cooling operation.
The damper opening angle corresponding to the dehumidification amount is proportionally controlled via a mod roll motor. However, since the temperature control is prioritized, the dehumidification control is forcibly terminated when the difference between the supply air temperature and the set temperature exceeds a certain value. At this time, the air conditioner control panel 10 outputs a fully closed signal to the cold / hot water coil bypass damper 40. The opening / closing of the bubble of the cold / hot water valve 5 is proportional to the temperature of the air supply load, the temperature in the air-conditioning load 1, that is, the return air temperature, via an open / close signal from the air conditioner control panel 10 via a mod roll motor. Controlled.

For the above control, in the air conditioner configured as shown in FIG. 8, control is performed by the control device 36 as in the flowchart shown in FIG. That is, the rotation speed of the air supply fan 6 is controlled via the inverter so that the air supply amount requested from the air conditioner control panel 10 is obtained, and the required air volume is secured. Next, return air C
The rotation speed of the exhaust fan 8 is controlled via an inverter so that the exhaust air amount is determined by the O ₂ concentration, the required air flow is secured by feedback control using the exhaust air speed sensor 39 value, and then the external air amount is controlled. .

At this time, the air conditioner control panel 10 first checks whether the opening degree of the outside air damper 13 or the outside air total heat exchange bypass damper 27 is fully open, and if the opening degree is not full, the outside air amount is equal to the exhaust amount. The opening angles of the outside air damper 13 and the outside air total heat exchange bypass damper 27 are proportionally controlled via the mod-roll motor so that

However, when the opening degree of the outside air damper 13 or the outside air total heat exchange bypass damper 27 is fully opened and the outside air amount does not become the same as the exhaust amount, especially when the outside air amount does not satisfy the required air amount. , The opening degree of the recirculation damper 26 is proportionally controlled in the direction in which the opening degree of the reflux damper 26 is reduced via the mod-roll motor. In addition, the exhaust amount fluctuates at the same time as the opening degree of the recirculation damper 26 is adjusted.
Sometimes the air supply also fluctuates. Therefore, returning to the control operation of the supply air amount or the exhaust air amount, the air supply fan 6 or the exhaust fan 8
The displacement is corrected by the rotation speed control and the feedback control of.

Then, the outside air amount is again changed to the outside air damper 13,
The proportional control is performed based on the opening angles of the outside air total heat exchange bypass damper 27 and the recirculation damper 26, and the control is repeatedly performed until the outside air amount becomes equal to the exhaust amount. In the flowchart of FIG. 5 described above, the control of the air conditioner is performed based on only the air volume. However, the control in which a temperature element is added to this control is as shown in the flowchart of FIG. 6 described above.

As described above, instead of the model as shown in FIG. 8, as an actual air conditioner, a configuration using two blowers of the air supply fan 6 and the exhaust fan 8 as in the model of FIG. I do. Further, the total heat exchanger 3, the outside air total heat exchange bypass path 30, the outside air total heat exchange bypass damper 2
7. An exhaust total heat exchange bypass path 31, an exhaust total heat exchange bypass damper 28, and the like are provided, and an air supply path 21, an air supply temperature sensor 33, and the like are provided.

The air conditioner thus configured can be controlled, including the air balance control according to the flowcharts shown in FIGS. 5 and 6 to make the intake amount of outside air and the exhaust amount the same. . Such control promotes the exhaust heat action, and performs the cooling operation by the outside air when the air conditioning load is small. Accordingly, an air conditioner and a control method of the air conditioner that can reduce the power of the blower, can realize energy saving, and can reduce the operation cost can be obtained.

Embodiment 6 FIG. 9 is also a conceptual configuration diagram showing an example of another embodiment of the present invention. FIG. 9 (a) is a plan view, and FIG. 9 (b) is a front view of FIG. 9 (a). In the figure, 3 is a total heat exchanger, 4 is a cold / hot water coil, 6 is an air supply fan, 8 is an exhaust fan, 9 is a filter, 12 is an exhaust damper, 13 is an outside air damper, 26 is a recirculation damper, and 27 is a whole outside air. A heat exchange bypass damper, 28 is an exhaust total heat exchange bypass damper, 40 is a cold / hot water coil bypass damper, 42 is a humidifier, 43 is an air supply port, 44 is an outside air port, 45 is a return air port, 4
6 is an exhaust port.

In the air conditioner configured as described above, two fans, an air supply fan 6 and an exhaust fan 8, are provided as blowers. Also, six dampers are provided: an exhaust damper 12, an outside air damper 13, a recirculation damper 26, an outside air total heat exchange bypass damper 27, an exhaust total heat exchange bypass damper 28, and a cold / hot water coil bypass damper 40.

The return air from the air-conditioning load 1 passes through the return air port 45, and a part of the return air passes through the recirculation damper 26 and is mixed with the introduced outside air. Then, the air passes through the filter 9 and the cold / hot water coil 4. However, during the heating operation, the air passes through the humidifier 42 and is supplied into the air-conditioning load 1 by the air-supplying fan 6 so that the air-conditioning in the air-conditioning load 1 is performed. Will be

[0098] When the exhaust damper 12 is open and the exhaust total heat exchange bypass damper 28 is closed, the other part of the return air from the air-conditioning load 1 performs exhaust heat in the total heat exchanger 3,
The air is exhausted outside through the exhaust port 46 by the exhaust fan 8 via the exhaust damper 12. When the exhaust damper 12 is closed and the exhaust total heat exchange bypass damper 28 is open, the exhaust heat is not performed in the total heat exchanger 3 and the exhaust fan 8 exhausts the exhaust heat through the exhaust total heat exchange bypass damper 28. Mouth 46
Exhausted to the outside through.

When the outside air is taken in from the outside air port 44 and the outside air damper 13 is opened and the outside air total heat exchange bypass damper 27 is closed, the exhaust heat is recovered by the total heat exchanger 3 after passing through the filter 9. Then, it is mixed with a part of the return air from the reflux damper 26. When the outside air damper 13 is closed and the outside air total heat exchange bypass damper 27 is open, the exhaust heat recovery is not performed in the total heat exchanger 3 and the return air bypass passage 29 passes through the outside air total heat exchange bypass damper 27. Mixed with some of the return air from

In the air conditioner configured as shown in FIG. 9, control is performed by the control device 36 in accordance with the above-described flow charts shown in FIGS. Then, control including air balance control for making the amount of outside air intake equal to the amount of exhaust air is performed to promote the exhaust heat action, and to perform the cooling operation by the outside air when the air conditioning load is small. Thus, an air conditioner and a control method of the air conditioner that can reduce the power of the blower, can realize energy saving, and can reduce the operating cost can be obtained.

Embodiment 7 FIG. FIGS. 10 and 11 also show an example of another embodiment of the present invention. FIG. 10 is a conceptual configuration diagram shown by an air path model, and FIG. 11 is control of an air conditioner by an air path model of FIG. It is a flowchart explaining. In addition, other than 10 and FIG.
An air conditioner is configured similarly to the embodiment of FIG. In the figure, 3 is a total heat exchanger, 4 is a cold / hot water coil, 6 is an air supply fan, 8 is an exhaust fan, 10 is an air conditioner control panel, 12 is an exhaust damper, and 13 is an outside air damper.

Also, 18 is an exhaust path, 19 is an outside air path,
21 is an air supply path, 22 is a return air path, 26 is a recirculation damper,
27 is an outside air total heat exchange bypass damper, 28 is an exhaust total heat exchange bypass damper, 29 is a return air bypass path, 30 is an external air total heat exchange bypass path, 31 is an exhaust total heat exchange bypass path, 32 is a cold / hot water electric valve, 33 is an air supply temperature sensor, 3
4 is a cold / hot water pipe, 35 is a return temperature / humidity sensor, 40 is a cold / hot water coil bypass damper, and 47 is a cold / hot water coil bypass route bypassing the cold / hot water coil.

In the air conditioner configured as described above, two fans, an air supply fan 6 and an exhaust fan 8, are provided as blowers. Also, six dampers are provided: an exhaust damper 12, an outside air damper 13, a recirculation damper 26, an outside air total heat exchange bypass damper 27, an exhaust total heat exchange bypass damper 28, and a cold / hot water coil bypass damper 40. Also,
A return air temperature / humidity sensor 35 is provided in the return air path 22
1 is provided with an air supply temperature sensor 33 and is connected to the air conditioner control panel 10. The supply air supplied from the supply path 21 is managed by the supply air temperature sensor 33.

The return air from the air-conditioning load 1 passes through the recirculation damper 26 and is cooled or heated by the cold / hot water coil 4, and is supplied into the air-conditioning load 1 by the air supply fan 6. The air conditioning inside is performed. In addition, the cold / hot water is supplied to the cold / hot water coil 4 for cooling or heating the supply air from a heat source device through a cold / hot water pipe 34 connected via a cold / hot water electric valve 32.

Further, a return air bypass path 29 for returning a part of the return air into the air-conditioning load 1 is provided, and the return air discharged to the outside of the air-conditioning load 1 is completely heated to use the exhaust heat. After passing through the exchanger 3, the air is discharged by the exhaust fan 8 through the exhaust damper 12. After passing through the outside air damper 13, the introduced outside air passes through the total heat exchanger 3 for exhaust heat recovery, is mixed with a part of the return air, and reaches the cold / hot water coil 4.

In the ordinary cooling / heating operation, the exhaust heat is utilized between the outside air and the exhaust by opening the exhaust damper 12 and the outside air damper 13 and passing the total heat exchanger 3 respectively. However, in the case of the cooling operation under the condition of the intermediate period or the like, an operation of bypassing the total heat exchanger 3 without using the exhaust heat is performed. That is, the exhaust damper 12 and the outside air damper 13
Is completely closed, the outside air total heat exchange bypass damper 27 and the exhaust total heat exchange bypass damper 28 are opened.

Then, the introduced outside air passes through the outside air total heat exchange bypass path 17 from the outside air path 19 and reaches the cold / hot water coil 4 via the outside air total heat exchange bypass damper 27. Also,
A part of the return air passes through the exhaust total heat exchange bypass path 31 and is exhausted to the outside of the air conditioning load 1 through the exhaust path 18 by the exhaust fan 8. In addition, the valve opening degree of the cold / hot water electric valve 32 is proportionally controlled according to the load of the air-conditioning load 1.

Further, humidity control is performed as described below. That is, the air conditioner control panel 10 is connected with the supply air temperature sensor 33 and the return temperature / humidity sensor 35, and the humidity is controlled by a control signal from the air conditioner control panel 10.
During the cooling operation, the cold / hot water coil bypass damper 40 is controlled by the return air humidity. The temperature control is prioritized in the entire air conditioner. If the supply air temperature is excessively reduced during the dehumidifying operation, the cold / hot water coil bypass damper 4 is used.
0 operations are restricted.

In contrast to the above control, in the air conditioner configured as shown in FIG. 10, control is performed by the control device 36 as shown in the flowchart of FIG.
That is, the cooling operation mode is set in step 401, and the process proceeds to step 402, in which the supply air temperature is set, and the opening of the electric motor valve is controlled so as to reach a target (set) temperature. Next, the process proceeds to step 403, and if the supply air temperature is not satisfied, the process proceeds to step 404. If the supply air temperature is satisfied, the process proceeds to step 406.

If the chilled / hot water electric valve is fully closed in step 404, the process proceeds to step 405, where the temperature control priority dehumidification control is stopped. If the chilled / hot water electric valve is not fully closed, the process returns to step 402. If it is not within the return air humidity setting range in step 406, the process proceeds to step 407, and the opening angle of the cold / hot water coil bypass bumper is proportionally controlled so that the return air humidity is below the set range. You.

Next, the routine proceeds to step 408, and if it is not stable within the supply air temperature setting range, the routine returns to step 402,
If stable, the process proceeds to step 409, and if the return air humidity has not fallen within the set range, the process returns to step 407,
If the return air humidity falls within the set range, step 41
The process proceeds to 0, and the dehumidification control ends.

In short, the dehumidification control is performed only during the cooling operation, and the temperature control is prioritized. Therefore, the hot and cold water is controlled by the temperature control signal from the air conditioner control panel 10 so that the supply air temperature is within the set range of the target temperature. The electric valve 32 is controlled. In addition,
At this time, if the supply air temperature does not reach the set value even if the chilled / hot water electric valve 32 is fully closed, the dehumidification control is not performed.

Further, in response to the dehumidification signal from the air conditioner control panel 10 by the return temperature / humidity sensor 35, the cold / hot water coil bypass damper 40 is proportionally controlled via the mod roll motor by an opening angle corresponding to the dehumidification amount. In this way, the flow rate of the cold / hot water coil bypass path 47 is controlled to adjust the flow rate of the cold / hot water coil 4. Specifically, when the return air temperature is higher than the set range, proportional control is performed in a direction in which the cold / hot water coil bypass damper 40 is opened. That is, it is normally closed at the time of normal, and approaches fully open as the return air humidity becomes larger than the set range.

When the difference between the supply air temperature and the set temperature becomes greater than or equal to a certain value during the dehumidification control, the temperature control is prioritized, and the dehumidification control is forcibly terminated. At this time, the air conditioner control panel 10 outputs a fully closed signal to the cold / hot water coil bypass damper 40. Further, the opening / closing of the chilled / hot water motor-operated valve 32 is proportionally controlled via a mod-roll motor according to an open / close signal from the air conditioner control panel 10 in accordance with the supply air temperature.

As described above, since the dehumidification amount control is performed by the air volume control by the cold / hot water coil bypass damper 40, the following operation can be obtained. That is, when the humidity control is being performed, the opening degree of the cold / hot water electric valve 32 is not directly controlled by the humidity, so that the supply air temperature does not decrease more than necessary.

At the same time, as long as there is no large change in the air-conditioning load 1, the load on the heat source unit supplying the cold water does not increase. Although the embodiment has been specifically described with reference to FIGS. 10 and 11, the configuration of FIGS. 10 and 11 can be easily applied to a similar configuration. The same operation as in the embodiment can be obtained.

[0117]

As described above, the present invention provides an outside air path, an air supply path communicating with the outside air path and connected to an air conditioning load, a return air path connected to the air conditioning load, and a return air path. An exhaust path that communicates with the path, a return air bypass path that connects the connection between the outside air path and the air supply path, and a connection between the return air path and the connection of the exhaust path, and a cold / hot water electric valve that is provided in the air supply path. A hot / cold water coil having a cold / hot water pipe connected thereto, a filter provided in the air supply path and disposed between the return air bypass path and the cold / hot water coil, and a cold / hot water coil and air conditioning provided in the air supply path A supply fan disposed between the loads, one of an exhaust fan provided in the exhaust path and a return air fan provided in the return path, an outside air damper provided in the outside air path, and a return air bypass. Provided in the route from the outside air route And reflux damper for mixing return air from the outside air and return air bypass passage, the air supply fan, one of the two, is provided with a control device for cooperatively controlling the outside air damper and reflux damper.

With this configuration, the air balance control is performed in which the two air blowers of the air supply fan, the return air fan, and the exhaust fan are used, and the intake amount of the outside air and the exhaust amount are the same. This has the effect of realizing energy saving and reducing operating costs. In addition, the number of blowers is reduced by one compared with the conventional configuration, and the space can be saved correspondingly, which has the effect of reducing equipment costs.

Further, as described above, the present invention provides a total heat exchanger connected to the outside air path and the exhaust path, an outside air total heat exchange bypass path provided in the outside air path and bypassing the total heat exchanger. An exhaust total heat exchange bypass path provided in the exhaust path and bypassing the total heat exchanger; an exhaust damper provided in the exhaust path; an external air total heat exchange bypass damper provided in the external air total heat exchange bypass path; An exhaust total heat exchange bypass damper provided in the total heat exchange bypass path is provided.

[0120] Thus, the configuration using the two air blowers, the supply air fan, the return air fan and the exhaust fan, and including the air balance control to make the intake amount of the outside air and the exhaust amount the same is provided. By performing the control using the total heat exchange bypass damper and the exhaust total heat exchange bypass damper, the exhaust heat action is promoted, and the cooling operation using the outside air when the air conditioning load is small is performed. This has the effect of realizing energy saving and reducing operating costs. Further, the number of blowers is reduced by one as compared with the conventional configuration, and the space is saved correspondingly, which has the effect of reducing equipment costs.

Further, as described above, the present invention is provided with the outside air velocity sensor provided on the outside air path and the exhaust air velocity sensor provided on the exhaust path.

With this configuration, the two air blowers, the air supply fan, the return air fan, and the exhaust fan, are used, and the outside air including the air balance control that makes the intake amount of the outside air and the exhaust amount the same is included. By performing control using a wind speed sensor and an exhaust wind speed sensor, an exhaust heat action is promoted. This has the effect of realizing energy saving and reducing operating costs. Also,
The number of blowers is reduced by one as compared with the conventional configuration, and the space is saved correspondingly, which has the effect of reducing equipment costs.

Further, as described above, the present invention provides an outside air path, an air supply path communicating with the outside air path and connected to an air conditioning load, a return air path connected to the air conditioning load, and a return air path. An exhaust path that communicates with the path, a return air bypass path that connects the connection between the outside air path and the air supply path, and a connection between the return air path and the connection of the exhaust path, and a cold / hot water electric valve that is provided in the air supply path. A hot / cold water coil having a cold / hot water pipe connected thereto, a filter provided in the air supply path and disposed between the return air bypass path and the cold / hot water coil, and a cold / hot water coil and air conditioning provided in the air supply path A supply fan disposed between the loads, one of an exhaust fan provided in the exhaust path and a return air fan provided in the return path, an outside air damper provided in the outside air path, and a return air bypass. Provided on the route, open air route A recirculation damper that mixes the outside air with the return air from the return air bypass path is provided, and air conditioning is performed by controlling the supply air flow rate by controlling the rotation speed of the supply fan and controlling the cooling / heating water quantity by controlling the opening of the cooling / heating water electric valve proportionally. The temperature in the load is maintained at a set value, the rotational speed of one of the two is controlled by a control operation for making the amount of outside air intake and the amount of exhaust the same, and the amount of exhaust from one of the two is set to a predetermined value, Proportionally controls the degree of opening of the damper provided in the system to make the amount of outside air intake equal to the amount of exhaust. To control.

With this arrangement, two air blowers, ie, the supply fan, the return air fan, and the exhaust fan are used, and the rotational speed of either the return air fan or the exhaust fan is controlled. By proportionally controlling the degree of opening of a damper provided in the path, air balance control is performed to make the amount of intake of outside air and the amount of exhaust equal. As a result, the effect of exhausting heat is promoted, energy saving can be realized, and there is an effect of reducing operating costs.

Further, as described above, the present invention provides an outside air path, an air supply path communicating with the outside air path and connected to the air conditioning load, a return air path connected to the air conditioning load and a return air path. An exhaust path that communicates with the path, a return air bypass path that connects the connection between the outside air path and the air supply path, and a connection between the return air path and the connection of the exhaust path, and a cold / hot water electric valve that is provided in the air supply path. A hot / cold water coil having a cold / hot water pipe connected thereto, a filter provided in the air supply path and disposed between the return air bypass path and the cold / hot water coil, and a cold / hot water coil and air conditioning provided in the air supply path A supply fan disposed between the loads, one of an exhaust fan provided in the exhaust path and a return air fan provided in the return path, an outside air damper provided in the outside air path, and a return air bypass. Provided on the route, open air route A reflux damper that mixes the outside air with the return air from the return air bypass path, a total heat exchanger connected to the external air path and the exhaust path, and a total heat of the external air that is provided in the external air path and bypasses the total heat exchanger. An exchange bypass path, an exhaust total heat exchange bypass path provided in the exhaust path to bypass the total heat exchanger, an exhaust damper provided in the exhaust path, and an outside air total heat exchange provided in the outside air total heat exchange bypass path. A bypass damper and an exhaust total heat exchange bypass damper provided in the exhaust total heat exchange bypass path are provided, and the output speed is controlled by controlling the exhaust fan rotation speed by a control operation that makes the amount of intake of outside air and the amount of exhaust equal. The amount of exhaust air, the opening degree of the damper provided in the path is proportionally controlled to make the amount of outside air intake equal to the amount of exhaust gas,
If the amount of outside air intake and the amount of exhaust do not become the same, the proportional control is performed in the direction of reducing the opening degree of the recirculation damper.

With this arrangement, two air blowers, ie, the supply fan, the return air fan, and the exhaust fan, are used, and the rotational speed of either the return air fan or the exhaust fan is controlled. An air balance control is performed in which the opening degree of the damper provided in the path is proportionally controlled to make the intake amount of outside air equal to the exhaust amount. As a result, the effect of exhausting heat is promoted, energy saving can be realized, and there is an effect of reducing operating costs.

Further, as described above, the present invention relates to a cold / hot water coil bypass path provided in the air supply path and bypassing the cold / hot water coil, and a cold / hot water coil bypass damper provided in the cold / hot water coil bypass path. Is provided.

With this configuration, the air supply fan, the return air fan, and any one of the exhaust fans are used, and the dehumidification amount is controlled by the air volume control by the cold / hot water coil bypass damper. The supply air temperature does not decrease. In addition, by performing air balance control in which the amount of intake of outside air and the amount of exhaust are the same, energy saving can be realized, and there is an effect of reducing operating costs. Further, the number of blowers is reduced by one as compared with the conventional configuration, and the space is saved correspondingly, which has the effect of reducing equipment costs.

Further, as described above, the present invention is provided with the supply air temperature sensor provided on the supply air path and the return air temperature / humidity sensor provided on the return air path.

[0030] With this configuration, two blowers, the supply fan, the return air fan, and the exhaust fan, are used, and the rotational speed of either the return air fan or the exhaust fan is controlled. An air balance control is performed in which the opening degree of the damper provided in the path is proportionally controlled to make the intake amount of outside air equal to the exhaust amount. As a result, the effect of exhausting heat is promoted, energy saving can be realized, and there is an effect of reducing operating costs.

Further, as described above, the present invention relates to an outside air path, an air supply path communicating with the outside air path and connected to an air conditioning load, a return air path connected to the air conditioning load, and a return air path. An exhaust path that communicates with the path, a return air bypass path that connects the connection of the outside air path and the supply path, and a connection of the return air path and the connection of the exhaust path, A hot / cold water coil having a cold / hot water pipe connected thereto, a filter provided in the air supply path and disposed between the return air bypass path and the cold / hot water coil, and a cold / hot water coil and air conditioning provided in the air supply path A supply fan disposed between the loads, one of an exhaust fan provided in the exhaust path and a return air fan provided in the return path, an outside air damper provided in the outside air path, and a return air bypass. Provided on the route, open air route And reflux damper for mixing return air from the outside air and return air bypass path et al., And the hot and cold water coil bypass path provided to supply path to bypass the cold water coil,
A cooling / heating water coil bypass damper provided in the cooling / heating water coil bypass path, and proportionally controlling the opening degree of the cooling / heating water coil bypass damper based on the return air humidity from the air conditioning load to reduce the bypass airflow of the cooling / heating water coil bypass path. The dehumidification amount is controlled to a predetermined value by adjusting the amount of air passing through the cold / hot water coil.

With this configuration, the air supply fan, the return air fan, and the exhaust fan are used, and the dehumidification amount is controlled by the air volume control by the cold / hot water coil bypass damper. The supply air temperature does not decrease. In addition, air balance control is performed to proportionally control the degree of opening of dampers provided in various paths to make the amount of intake of outside air and the amount of exhaust equal. As a result, the effect of exhausting heat is promoted, energy saving can be realized, and there is an effect of reducing operating costs.

[Brief description of the drawings]

FIG. 1 is a view showing a first embodiment of the present invention, and is a conceptual configuration diagram shown by an air path model;

FIG. 2 is a flowchart illustrating control of the air-conditioning apparatus based on the wind path model of FIG.

FIG. 3 is a view showing a second embodiment of the present invention, and is a conceptual configuration diagram shown by an air path model;

FIG. 4 is a view showing a third embodiment of the present invention, and is a conceptual configuration diagram shown by an air path model.

FIG. 5 is a flowchart illustrating control of the air-conditioning apparatus based on the air path model of FIG. 4;

FIG. 6 is a flowchart illustrating another control of the air conditioner based on the wind path model of FIG. 4;

FIG. 7 is a view showing a fourth embodiment of the present invention, and is a conceptual configuration diagram shown by an air path model.

FIG. 8 is a view showing a fifth embodiment of the present invention, and is a conceptual configuration diagram shown by an air path model.

9 (a) is a plan view, and FIG. 9 (b) is a front view of FIG. 9 (a).

FIG. 10 is a view showing a seventh embodiment of the present invention, and is a conceptual configuration diagram shown by an air path model.

FIG. 11 is a flowchart illustrating control of the air-conditioning apparatus using the air path model in FIG. 10;

FIG. 12 is a conceptual configuration diagram of a conventional air conditioner.

FIG. 13 is a conceptual configuration diagram showing another conventional air conditioner using an air path model.

[Description of Signs] 1 air conditioning load, 3 total heat exchanger, 4 cold / hot water coil, 6 air supply fan, 8 exhaust fan, 9 filter, 1
2 exhaust damper, 13 outside air damper, 18 exhaust path,
19 outside air route, 21 air supply route, 22 return air route, 2
6 reflux damper, 27 outside air total heat exchange bypass damper,
28 Exhaust total heat exchange bypass damper, 29 Return air bypass path, 30 Outside air total heat exchange bypass path, 31 Exhaust total heat exchange bypass path, 32 Cooling / hot water electric valve, 33 Supply air temperature sensor, 34 Cold / hot water piping, 35 Return air Humidity sensor, 36 control device, 37 return air fan, 38 outside air speed sensor, 39 exhaust air speed sensor, 40 cold / hot water coil bypass damper, 47 cold / hot water coil bypass path.

 ──────────────────────────────────────────────────続 き Continuing on the front page (72) Inventor Junichi Ichikawa 2-3-2 Marunouchi, Chiyoda-ku, Tokyo Mitsui Electric Co., Ltd. (72) Inventor Hiroki Masui 2-3-2 Marunouchi, Chiyoda-ku, Tokyo Rishi Electric Co., Ltd. (72) Inventor Yuichi Nishi 2-6-1, Otemachi, Chiyoda-ku, Tokyo Sanishi Electric Co., Ltd. (72) Inventor Shizuo Fuchida 2-3-2, Marunouchi, Chiyoda-ku, Tokyo No. Mitsubishi Electric Corporation

Claims (8)

[Claims] 1. An outside air path, an air supply path communicating with the outside air path and connected to an air conditioning load, a return air path connected to the air conditioning load, and an exhaust path communicating with the return air path. A return / air bypass path connecting the outside air path and the supply path connection part and the return air path / exhaust path connection part; , A filter provided in the air supply path and disposed between the return air bypass path and the cold / hot water coil, and a cold / hot water coil and air conditioning provided in the air supply path An air supply fan disposed between the loads, one of both an exhaust fan provided in the exhaust path and a return air fan provided in the return path, and an external air damper provided in the external air path; Installed in the return air bypass A return damper that mixes outside air from the outside air path and return air from the return air bypass path; and a control device that cooperatively controls one of the supply fan and the outside air damper and the return damper. Air conditioner. 2. A total heat exchanger connected to the outside air path and the exhaust path, an outside air total heat exchange bypass path provided in the outside air path and bypassing the total heat exchanger, and provided in the exhaust path. An exhaust heat exchange bypass path that bypasses the total heat exchanger, an exhaust damper provided in the exhaust path,
2. The exhaust gas total heat exchange bypass damper provided in the outside air total heat exchange bypass path provided in the outside air total heat exchange bypass path and the exhaust total heat exchange bypass damper provided in the exhaust total heat exchange bypass path. Air conditioner. 3. The air according to claim 1, further comprising an outside air speed sensor provided in the outside air path, and an exhaust air speed sensor provided in the exhaust path. Harmony equipment. 4. An external air path, an air supply path communicating with the external air path and connected to an air conditioning load, a return air path connected to the air conditioning load, and an exhaust path communicating with the return air path. A return / air bypass path connecting the outside air path and the supply path connection section and the return air path / exhaust path connection section, and a cold / hot water pipe provided in the supply path and having a hot / cold water electric valve. , A filter provided in the air supply path and disposed between the return air bypass path and the cold / hot water coil, and a cold / hot water coil and air conditioning provided in the air supply path An air supply fan disposed between the loads, one of both an exhaust fan provided in the exhaust path and a return air fan provided in the return path, and an external air damper provided in the external air path; Installed in the return air bypass A return damper that mixes the outside air from the outside air path and the return air from the return air bypass path, controls the supply air flow rate by controlling the rotation speed of the supply fan, and opens the cooling / heating water electric valve. The temperature in the air-conditioning load is maintained at a set value by controlling the amount of cold and hot water by proportional control, and the rotational speed of one of the two is controlled by a control operation in which the amount of intake of outside air and the amount of exhaust are the same, and one of the two is controlled. When the amount of exhaust by the output is a predetermined value, the opening degree of the damper provided in the path is proportionally controlled to make the amount of outside air intake equal to the amount of exhaust gas, and the amount of outside air intake and the amount of exhaust gas are not the same. In addition, a method of controlling an air conditioner that performs proportional control in a direction in which the opening degree of the reflux damper is reduced. 5. An external air path, an air supply path communicating with the external air path and connected to an air conditioning load, a return air path connected to the air conditioning load, and an exhaust path communicating with the return air path. A return / air bypass path connecting the outside air path and the supply path connection section and the return air path / exhaust path connection section, and a cold / hot water pipe provided in the supply path and having a hot / cold water electric valve. , A filter provided in the air supply path and disposed between the return air bypass path and the cold / hot water coil, and a cold / hot water coil and air conditioning provided in the air supply path An air supply fan disposed between the loads, one of both an exhaust fan provided in the exhaust path and a return air fan provided in the return path, and an external air damper provided in the external air path; Installed in the return air bypass A recirculation damper that mixes the outside air from the outside air path and the return air from the return air bypass path; a total heat exchanger connected to the outside air path and the exhaust path; An outside air total heat exchange bypass path bypassing the total heat exchanger, an exhaust total heat exchange bypass path provided in the exhaust path and bypassing the total heat exchanger, an exhaust damper provided in the exhaust path, An external air total heat exchange bypass damper provided in the external air total heat exchange bypass path and an exhaust total heat exchange bypass damper provided in the exhaust total heat exchange bypass path are provided, and the external air intake amount and the exhaust amount are the same. By controlling the rotation speed of the exhaust fan, the output is set to a predetermined exhaust amount, the opening degree of a damper provided in the path is proportionally controlled to make the external air intake amount equal to the exhaust amount, Intake and exhaust There controlling method of an air conditioner for proportional control in a direction to narrow the opening of the reflux damper when not in the same amount. 6. A cold / hot water coil bypass path provided in an air supply path and bypassing a cold / hot water coil, and a cold / hot water coil bypass damper provided in the cold / hot water coil bypass path. The air conditioner according to any one of claims 1 to 3. 7. The air conditioner according to claim 1, further comprising a supply air temperature sensor provided in the supply air path, and a return air temperature and humidity sensor provided in the return air path. An air conditioner according to item 1. 8. An external air path, an air supply path communicating with the external air path and connected to an air conditioning load, a return air path connected to the air conditioning load, and an exhaust path communicating with the return air path. A return / air bypass path connecting the outside air path and the supply path connection section and the return air path / exhaust path connection section, and a cold / hot water pipe provided in the supply path and having a hot / cold water electric valve. , A filter provided in the air supply path and disposed between the return air bypass path and the cold / hot water coil, and a cold / hot water coil and air conditioning provided in the air supply path An air supply fan disposed between the loads, one of both an exhaust fan provided in the exhaust path and a return air fan provided in the return path, and an external air damper provided in the external air path; Installed in the return air bypass A return damper that mixes the outside air from the outside air path and the return air from the return air bypass path; a cold / hot water coil bypass path provided in the air supply path to bypass the cold / hot water coil; A cooling / heating water coil bypass damper provided in the coil bypass path, and proportionally controlling an opening degree of the cooling / heating water coil bypass damper based on a return air humidity from the air-conditioning load to reduce a bypass air volume of the cooling / heating water coil bypass path. A method for controlling an air conditioner, wherein the air conditioner adjusts the amount of air passing through the cold / hot water coil to control the dehumidification amount to a predetermined value.