JPH05113239A - Air conditioner - Google Patents

Abstract

PURPOSE:To make it possible to maintain the pressure in a room to be air- conditioned at a predetermined value by computing control input of one device to control it based on the control input of the other device which determines either exhaust air quantity or outside air quantity. CONSTITUTION:In an air conditioner which includes a suction fan 1, an exhaust air fan 3, and an outside air fan 4, each of which can be operated at variable speed by an inverter 2, a main filter 5, a low hot water coil 6, and a total heat exchanger 7, an exhaust damper 10, an outside air damper 14, and an outside air total heat exchanger by-pass damper 15 are provided, wherein a damper opening meter and a damper drive motor are provided for each of the dampers. And, for example, when the heat exchanger 7 is used, degree of opening of the damper 10 is computed by a controller 20 based on the degree of opening of the damper 14. Based on the result of the computing, an exhaust damper drive motor 10M is actuated to control the opening of the damper 10, so that the interior of a room R to be air-conditioned is maintained at a desired constant pressure.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an air conditioner, and more particularly to an air conditioner capable of controlling the pressure in an air-conditioned room.

[0002]

2. Description of the Related Art A typical conventional air conditioner having a total heat exchanger will be described with reference to FIGS. FIG. 6 is a diagram showing a schematic configuration of a conventional air conditioner, and FIG. 7 is a flow sheet corresponding to FIG. The air conditioner includes an air supply fan 31 that supplies air to the room, a return air fan 32 that recirculates the room air, and a main filter 33 that filters the air.
And a cold / hot water coil 34 and a total heat exchanger 35.

The operation of the conventional air conditioner is shown in FIGS.
Briefly, the air supply to the room is
After passing through the main filter 33, the cold / hot water coil 34, and the compartment 37 to the air supply fan 31, the pressure is increased, and then the air is supplied to the air-conditioned room (not shown) through the air supply duct connection port 38. On the other hand, the return air from the room is the return air duct connection port 39.
After being sucked into the return air fan 32 and boosted in pressure, it enters the compartment 40 and splits, and one is discharged as exhaust air to the outside through the total heat exchanger 35, the compartment 41 and the exhaust duct connection port 42. , The other one enters the compartment 36 through the damper 43, is mixed with the outside air, and is then supplied to the room through the supply air path again. The outside air supplied as fresh air into the room enters the compartment 36 from the outside air intake 44 through the total heat exchanger 35, is mixed with the return air, and then is supplied into the room through the supply air path.

In the conventional device thus constructed, V
When using the AV (variable air supply) system, the air supply fan 3
1, both the return air fan 32 and the inverter 31
a and 32a are configured to have a variable speed, the rotation speed of the return air fan 32 is controlled based on the rotation speed of the supply air fan 31, and the return air flow rate is adjusted.

[0005]

However, in the conventional air conditioner, in order to change the amount of outside air introduced according to the degree of pollution of the non-air-conditioned space, the opening degree of the damper 43 located downstream of the return air fan 32. Was being adjusted. Therefore, the damper 43
However, as described above, the rotation speed of the return air fan 32 is controlled only based on the rotation speed of the air supply fan 31, and the opening degree of the damper 43 is controlled. Nothing was considered. Therefore, there is a problem in that the amount of return air flow by the return air fan 32 becomes insufficient due to the change in the opening degree of the damper 43, or conversely, the return air flow amount becomes too large, and the pressure balance in the air-conditioned room is disrupted. When the pressure in the air-conditioned room becomes lower than the pressure in the non-air-conditioned space, the air in the non-air-conditioned space may flow into the air-conditioned room. On the contrary, when the pressure in the air-conditioned room becomes higher than the pressure in the non-air-conditioned space, it is difficult to open and close the door, and there is a problem that sound is emitted from the gap of the door.

The present invention has been made in view of the above-mentioned points, and the object thereof is to maintain the pressure in the air-conditioned room at a substantially constant level without being higher or lower than the pressure in the non-air-conditioned space. It is to provide an air conditioner that can be controlled to a value.

[0007]

In order to achieve the above-mentioned object, one aspect of the air conditioner of the present invention is an air supply fan for supplying air to a room, and an exhaust fan for discharging air in the room to the outside. An outside air introduction fan for introducing outdoor air, a main filter for filtering air, a cold / hot water coil, an exhaust system damper means provided in the exhaust system passage, and an outside air system damper means provided in the outside air introduction system passage And a controller, and a part of the return air from the air-conditioned room is exhausted to the outside by the exhaust fan through the exhaust system damper means,
The outside air introduced by the outside air introducing fan passes through the outside air system damper means, is mixed with the ambient air, and is cooled by the cold / hot water coil during cooling, and heated during heating,
An air conditioner that supplies air into an air-conditioned room by the air supply fan, and inputs an operation amount of one device that determines one of an exhaust air flow rate and an outside air flow rate to the controller, and the controller controls the other. The operation amount of the other device that determines the outside air flow rate or the exhaust air flow rate is calculated, and the other device is controlled so that the pressure in the air-conditioned room is maintained at a predetermined value. is there.

Another aspect of the air conditioner of the present invention is
An air supply fan that supplies air to the room, an exhaust fan that discharges the indoor air to the outside, an outside air introduction fan that introduces the outdoor air, a main filter that filters the air, a hot and cold water coil, and an exhaust system passage. An exhaust system damper means provided in the outside air system, an outside air system damper means provided in an outside air introduction system path, and a controller, and a part of the return air from the room to be conditioned is passed through the exhaust system damper means to produce the exhaust gas. While exhausting to the outside by a fan, the outside air introduced by the outside air introduction fan passes through the outside air system damper means and is mixed with the return air,
An air conditioner that cools during cooling, heats during heating by the cold / hot water coil, and supplies air into the air-conditioned room by the air supply fan, which is either an exhaust air volume or an outside air volume. Is provided with an air volume measuring means for measuring the air flow rate measuring means, the measured value of the air volume measuring means is input to the controller, and the controller calculates the operation amount of the device for determining the outside air air volume or the exhaust air volume, and the pressure in the air-conditioned room. Is controlled so that is maintained at a predetermined value.

[0009]

According to one aspect of the present invention having the above-described configuration, the operation amount of one device that determines either the exhaust air flow rate or the external air flow rate is input to the controller, and the other external air flow rate or the exhaust gas is output by the controller. It is possible to calculate the operation amount of the other device that determines the air volume, control the other device based on the calculation result, and control so that the pressure in the air-conditioned room is maintained at a predetermined value.

According to another aspect of the present invention, one of the exhaust air volume and the outside air volume is measured, the measured value is input to the controller, and the other exhaust air volume or the outside air volume is controlled by the controller. It is possible to calculate the manipulated variable of the device for determining, and to control the device based on the result of the calculation so that the pressure in the air-conditioned room is maintained at a predetermined value as described above.

[0011]

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

FIG. 1 is a diagram showing a basic configuration of an air conditioner according to the present invention. The air conditioner has an air supply fan 1 for supplying air into a room with a variable air flow rate for variable speed operation by an inverter 2. An exhaust fan 3 for discharging indoor air to the outside, an outside air fan 4 for introducing outdoor air, a main filter 5 for filtering the air, a cold / hot water coil 6, and a total heat exchanger 7. There is. Then, the return air path for returning the air in the air-conditioned room R is configured to be guided to the main filter 5 via the return air pre-filter 8 without passing through the return air fan,
The exhaust gas is branched and taken out from the return air path, the exhaust path passes through the partition 9, the exhaust damper 10 and the total heat exchanger 7 and is introduced into the exhaust fan 3, and the exhaust fan 3 causes the exhaust duct 11 to move outdoors. The exhaust air is introduced into the outside air fan 4 from the outside air intake 12 through the outside air pre-filter 13 and the outside air introduction path is branched downstream of the outside air fan 4 to pass through the total heat exchanger 7. It is configured to be introduced into the main filter 5 from the section 9 by passing through the outside air damper 14 and the path from the section 9 to the main filter 5, and bypassing the total heat exchanger 7 and passing through the outside air total heat exchanger bypass circuit damper 15. It was done.

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

Return air from the air-conditioned room R passes through the return air pre-filter 8 and is diverted from the compartment 9. One passes through the exhaust damper 10 as exhaust air and passes through the total heat exchanger 7. ,
The exhaust fan 3 discharges the air to the outside, and the other one is mixed with the outside air in the compartment 9 and then supplied again into the air-conditioned room R through the air supply route. On the other hand, the outside air supplied as fresh air into the air-conditioned room R is sucked by the outside air fan 4 from the outside air intake 12, and when the total heat exchanger 7 is used,
The outside air passes through the total heat exchanger 7 and the outside air damper 14,
After being mixed with the return air in the compartment 9, the air is supplied again into the air-conditioned room R via the air supply path. On the other hand, when the total heat exchanger 7 is not used, the outside air bypasses the total heat exchanger 7, passes through the outside air total heat exchanger bypass bypass damper 15, and is mixed with the return air in the section 9, Air-conditioned room R again via the air supply route
Supplied within.

Next, the structure of the control device for controlling the pressure in the air-conditioned room R to be constant will be described with reference to FIG. In this control device, the exhaust damper 10 and the outside air damper 1
4, the damper 15 for the outside air total heat exchanger detour is a damper opening degree meter 10a, 14a, 1 for detecting the opening degree of the damper, respectively.
The damper drive motors 10M, 14M, and 15M are provided for driving the damper as well as 5a. And each damper opening degree meter 10a, 14a, 15a is the controller 2
0, and each of the damper driving motors 10M, 1
4M and 15M are also connected to the controller 20. The exhaust damper 10 constitutes an exhaust system damper means, and includes an outside air damper 14 and an outside air total heat exchanger bypass circuit damper 15.
Respectively constitute an outside air system damper means.

Further, the exhaust fan 3 and the outside air fan 4 are
The inverters 21 and 22 are configured to allow variable speed operation. The inverters 21 and 22 are connected to the controller 20. Next, the control mode in the control device configured as described above will be described.
In each of the following control modes, not all of the control components that make up the control device are required, but for simplification of the drawing, FIG. 2 discloses all target control components. ing.

(A) When the opening degree of the exhaust damper 10 is controlled by the opening degree of the outside air damper 14 or the outside air total heat exchanger detour damper 15 When the total heat exchanger 7 is used, the outside air is Entrance 1
2 is sucked by the outside air fan 4, passes through the outside air damper 14 via the total heat exchanger 7, and is mixed with the return air,
It is supplied into the air-conditioned room R via the air supply path. At this time, the opening degree of the outside air damper 14 is input to the controller 20 by the opening degree meter 14a. The controller 20 calculates the opening degree of the exhaust damper 10 based on the opening degree of the outside air damper 14, inputs the calculation result to the drive motor 10M of the exhaust damper 10, and opens the exhaust damper 10 by a predetermined opening degree. As a result, the exhaust air volume is controlled, and the inside of the air-conditioned room R is maintained at a desired constant pressure.

On the other hand, when the total heat exchanger 7 is not used,
Since the outside air passes through the outside air total heat exchanger detour damper 15, the opening degree of the exhaust damper 10 is controlled by the controller 20 based on the opening degree of the damper 15 to control the exhaust air volume, and the inside of the air-conditioned room R is controlled. Is maintained at a predetermined pressure.

In this control mode, the inverters 21 and 22 of the exhaust fan 3 and the outside air fan 4 are unnecessary,
The exhaust fan 3 and the outside air fan 4 are operated at a constant speed.

Next, a concrete method for calculating the opening degree of the exhaust damper 10 by the opening degree of the outside air damper 14 will be described with reference to FIGS.
Will be described. Depending on the opening degree of the outside air damper 14,
Considering the case of controlling the opening degree of the exhaust damper 10, FIG.
From the mass balance of the air-conditioned room R and the air conditioner as shown in Fig. 2, the air-conditioned room: Q _SA = Q _E + Q _D + Q _RA …… (1) Air conditioner: Q _SA + Q _EA = Q _RA + Q _OA …… (2 ) Where: Q _SA : Amount of air supplied from the air conditioner to the air-conditioned room Q _RA : Amount of return air from the air-conditioned room to the air conditioner Q _OA : Amount of outside air introduced into the air conditioner Q _EA : Exhaust air amount of the air conditioner Q _E : Ventilation volume of the air-conditioned room Q _D : The amount of air leaking from the air-conditioned room. From Eqs. (1) and (2), Q _EA = Q _OA − (Q _E + Q _D ) ... (3). Further, description will be given using a graph showing the relationship between the damper opening degree X and the air volume Q in FIG. Here, the function of the opening degree X and the air flow rate Q peculiar to the outside air damper 14 is Q = f _OA (X) (4) Similarly, the function of the opening degree X and the air flow rate Q peculiar to the exhaust damper 10 is Q = f _{When EA} (X) (5), the outside air introduction amount Q _OA is determined by the CO ₂ concentration in the air-conditioned room, so the opening X ₁₄ of the outside air damper in FIG. 4 is determined from the CO ₂ concentration, and (4 From the equation), Q _OA = f _OA (X ₁₄ ) and the outside air flow rate Q _OA in FIG. 4 can be obtained. Further, since Q _E and Q _D are determined by the design of the air-conditioned room, the exhaust air flow Q _{EA in} FIG. 4 is Q _EA = f _OA (X ₁₄ ) − (Q _E + Q _D ) according to the equation (3). .. Here, _assuming that the inverse function of the equation (5) is X = f _EA ^-1 (Q) (6), the opening X ₁₀ of the exhaust damper in FIG. 4 is X ₁₀ = f _EA ^-1 (Q _EA ) ... (7) can be calculated. Further, in the same manner, the opening degree of the exhaust damper can be calculated from the opening degree of the outside air total heat exchanger bypass circuit damper 15.

(B) When the opening degree of the outside air damper 14 or the outside air total heat exchanger detour damper 15 is controlled by the opening degree of the exhaust damper 10, which is the reverse of the control mode of (a) above, The opening degree is input to the controller 20 from the opening degree meter 10a,
The controller 20 controls the opening degree of the outside air damper 14 (when the total heat exchanger 7 is used) or the outside air total heat exchanger bypass damper 15 (when the total heat exchanger 7 is not used) to control the amount of outside air flow. To control. In this control mode, the inverters 21 and 22 are unnecessary. In addition, the above (a)
The opening degree of the outside air damper 14 or the outside air total heat exchanger detour damper 15 can be calculated from the opening degree of the exhaust damper 10 by the reverse method of the calculation for obtaining the opening degree of the exhaust damper 10. Similarly, in the other modes below, the opening of the damper or the rotation speed of the fan can be calculated, and therefore the description thereof will be omitted.

(C) When the exhaust fan 3 is controlled by the opening degree of the outside air damper 14 or the outside air total heat exchanger detour damper 15: The outside air damper 14 (when the total heat exchanger 7 is used) or the outside air total heat exchange The opening degree of the damper 15 for the bypass circuit (when the total heat exchanger 7 is not used) is input to the controller 20 from the opening meter 14a or 15a, and the inverter 21 of the exhaust fan 3 is controlled by the controller 20 to exhaust the exhaust gas. The rotation speed of the fan 3 is controlled. At this time, the exhaust damper 10 is fully open. In this control mode, the amount of exhaust air discharged from the air-conditioned room R is controlled, and the inside of the air-conditioned room R is maintained at a predetermined pressure. In this control mode, other control components such as the inverter 22 are unnecessary.

(D) When the outside air fan 4 is controlled by the opening degree of the exhaust damper 10 The opening degree of the exhaust damper 10 is input to the controller 20 from the opening degree meter 10a, and the inverter 22 of the outside air fan 4 is controlled by this controller 20. The rotation speed of the outside air fan 4 is controlled. In this control mode, the amount of outside air introduced into the air-conditioned room R is controlled, and the inside of the air-conditioned room R is maintained at a predetermined pressure.

(E) When the rotation speed of the exhaust fan 3 is controlled by the rotation speed of the outside air fan 4, a signal corresponding to the rotation speed of the outside air fan 4 is input from the inverter 22 of the outside air fan 4 to the controller 20. By exhaust fan 3 inverter 2
1 to control the rotation speed of the exhaust fan 3. In this control mode, the amount of exhaust air discharged from the air-conditioned room R is controlled, and the inside of the air-conditioned room R is maintained at a predetermined pressure. In this case, each damper 10, 14, 15 is fully opened.
It is regarded as a fully closed control.

(F) When the rotation speed of the outside air fan 4 is controlled by the rotation speed of the exhaust fan 3 A signal corresponding to the rotation speed of the exhaust fan 3 is input from the inverter 21 of the exhaust fan 3 to the controller 20. By the inverter 2 of the outside air fan 4
2 is controlled, the rotation speed of the outside air fan 4 is controlled, and the inside of the air-conditioned room R is maintained at a predetermined pressure. In this case, the dampers 10, 14 and 15 are considered to be fully open / closed.

(G) In addition, a control mode in which the opening degree of the exhaust damper 10 is controlled by the rotation speed of the outside air fan 4, and the outside air damper 14 or the damper 15 for the outside air total heat exchanger bypass circuit is opened depending on the rotation speed of the exhaust fan 3. A control mode for controlling the degree can be adopted.

Next, another configuration of the control device for controlling the pressure in the air-conditioned room R will be described with reference to FIG.

In the present control device, in addition to the control configuration of FIG. 2, an exhaust air flow meter 24 for measuring the exhaust air flow rate in the exhaust system passage.
And an outside air flow meter 25 for measuring the amount of outside air introduced into the outside air system path, and these air flow meters 24, 25 are connected to the controller 20.

Next, the control mode in the control device configured as described above will be described. In each of the following control modes, not all of the control components that make up the control device are required, but for simplification of the drawing, FIG. 5 discloses all target control components. There is.

(A) When controlling the outside air fan 4 based on the exhaust air flow meter 24: The exhaust air flow rate is directly detected by the exhaust air flow meter 24 provided in the exhaust system path, and the detected value is input to the controller 20, The controller 20 controls the inverter 22 of the outside air fan 4 to control the rotation speed of the outside air fan 4. Thereby, the amount of outside air introduced into the air-conditioned room R is controlled, and the inside of the air-conditioned room R is maintained at a desired constant pressure.

(B) Controlling the degree of opening of the outside air damper 14 or the outside air total heat exchanger detour damper 15 based on the exhaust air flow meter 24. The exhaust air flow rate detected by the exhaust air flow meter 24 is input to the controller 20. The controller 20 controls the opening degree of the outside air damper 14 (when the total heat exchanger 7 is used) or the damper 15 for the outside air total heat exchanger bypass circuit (when the total heat exchanger 7 is not used) to control the outside air flow rate. To control. In this control mode, the inverters 21 and 22 are unnecessary.

(C) When the exhaust fan 3 is controlled based on the outside air flow meter 25: The outside air introduction amount is directly detected by the outside air flow meter 24 provided in the outside air passage, and this detected value is input to the controller 20. The controller 20 controls the inverter 21 of the exhaust fan 3 to control the rotation speed of the exhaust fan 3. As a result, the amount of exhaust air discharged from the air-conditioned room R is controlled, and the inside of the air-conditioned room R is maintained at a desired constant pressure.

(D) When the exhaust damper 10 is controlled based on the outside air flow meter 25 The outside air introduction amount detected by the outside air flow meter 25 is input to the controller 20, and the controller 20 controls the opening degree of the exhaust damper 10. The exhaust air volume. In this control mode, the inverters 21 and 22 are unnecessary.

In the embodiment, the damper opening degree meter is provided to detect the damper opening degree. However, the controller may calculate the damper opening degree by a signal to the damper driving motor.

[0035]

As described above, according to the air conditioner of the present invention, the amount of outside air introduced into the air-conditioned room or the amount of exhaust air discharged from the air-conditioned room can be controlled, so that the pressure in the air-conditioned room is controlled. Can be controlled to a desired value, and there is no fear that the pressure in the air-conditioned room will be lower than the pressure in the non-air-conditioned space, or conversely the pressure in the air-conditioned room will be higher than the pressure in the non-air-conditioned space.

[Brief description of drawings]

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

FIG. 2 is a flow sheet showing a control configuration of an embodiment of the air conditioner according to the present invention.

FIG. 3 is an explanatory diagram showing a control method of an embodiment of the air conditioner according to the present invention.

FIG. 4 is an explanatory diagram showing a control method of an embodiment of the air conditioner according to the present invention.

FIG. 5 is a flow sheet showing another control configuration of an embodiment of the air conditioner according to the present invention.

FIG. 6 is an explanatory diagram showing the basic configuration of a conventional air conditioner.

FIG. 7 is a flow sheet showing a conventional air conditioner.

[Explanation of symbols]

 1 Air Supply Fan 2 Inverter 3 Exhaust Fan 4 Outside Air Fan 5 Main Filter 6 Cold / Hot Water Coil 7 Total Heat Exchanger 10 Exhaust Damper 11 Exhaust Duct 12 Outside Air Intake 14 Outside Air Damper 15 Outside Air Total Heat Exchanger Detour Damper 10a, 14a , 15a Damper opening meter 10M, 14M, 15M Damper drive motor 20 Controller 21, 22 Inverter 24 Exhaust air flow meter 25 Outside air air flow meter

Claims (2)

[Claims] 1. An air supply fan for supplying air to a room, an exhaust fan for discharging indoor air to the outside, an outside air introducing fan for introducing outdoor air, a main filter for filtering air, and a hot / cold water coil. An exhaust system damper means provided in the exhaust system passage, an outside air system damper means provided in the outside air introduction system passage, and a controller, and a part of the return air from the air-conditioned room is provided in the exhaust system damper means. Through the exhaust fan to the outside, the outside air introduced by the outside air introduction fan is passed through the outside air system damper means, mixed with the ambient air, and cooled by the cold / hot water coil during cooling. , Heating during heating, by the air supply fan,
An air conditioner for supplying air into an air-conditioned room, which inputs the operation amount of one device that determines either the exhaust air amount or the outside air amount to the controller, and the controller causes the other outside air amount or exhaust air amount to be input. The air conditioner is characterized in that the operation amount of the other device that determines is calculated and the other device is controlled so that the pressure in the air-conditioned room is maintained at a predetermined value. 2. An air supply fan for supplying air to the room, an exhaust fan for discharging indoor air to the outside, an outside air introducing fan for introducing the outdoor air, a main filter for filtering the air, and a hot / cold water coil. An exhaust system damper means provided in the exhaust system passage, an outside air system damper means provided in the outside air introduction system passage, and a controller, and a part of the return air from the air-conditioned room is provided in the exhaust system damper means. Through, through the exhaust fan to the outside, the outside air introduced by the outside air introduction fan passes through the outside air system damper means, is mixed with the return air, by the cold and hot water coil, cooled during cooling, An air conditioner which is heated during heating and is supplied into the air-conditioned room by the air supply fan, and is provided with an air volume measuring means for measuring either one of an exhaust air volume and an outside air volume, and the air volume. Measurement The measured value of the controller is input to the controller, and the controller calculates the operation amount of the other device that determines the outside air flow rate or the exhaust air flow rate so that the pressure in the air-conditioned room is maintained at a predetermined value. An air conditioner characterized by being controlled.