JP2007132537A - Air conditioning control system - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide an air conditioning control system capable of immediately responding to the change of outside air such as outside air temperature and humidity, and saving energy by controlling outside air introduction cooling without time delay. <P>SOLUTION: Air volumes for outside air introduction VAV1 and atmospheric exhaust VAV2 are controlled on the basis of temperature difference Δt(out) between a target temperature (controlled room target temperature) t(sp) determined to a controlled room 1 and the outside air temperature t(out). Thus a mixing ratio of the outside air included in the mixed air MIX1 is changed by immediately responding to the change of outside air temperature, and energy can be saved by controlling the outside air introduction cooling without time delay. The air volumes of outside air introduction VAV1 and atmospheric exhaust VAV2 may be controlled on the basis of enthalpy difference between a target enthalpy (controlled room target enthalpy) and outside air enthalpy. <P>COPYRIGHT: (C)2007,JPO&INPIT

Description

  The present invention relates to an air conditioning control system that performs air conditioning control by taking outside air into return air from a controlled room.

  Conventionally, in a clean room or the like, in order to ensure indoor air quality, part of the return air from the controlled room is returned to the air conditioner, and outside air is taken into the return air to be returned to the air conditioner. The mixed air is mixed with outside air, and the mixed air is cooled or heated by an air conditioner as necessary, or is humidified, and is supplied as conditioned air into the controlled room (for example, see Patent Document 1).

  FIG. 3 shows an outline of a conventional air conditioning control system that controls the air conditioning by taking outside air into the return air. In the figure, 1 is a controlled room (clean room), 2 is an air conditioner that supplies conditioned air to the controlled room 1, and T2 is the temperature of conditioned air blown out from the air conditioner 2 (air conditioner blowing temperature) tSA. Air supply temperature sensor for detecting the temperature, T3 is a room temperature sensor for detecting the temperature (controlled room temperature) tpv in the controlled room 1, and H3 is the humidity (controlled room humidity) Hpv in the controlled room 1 It is an indoor humidity sensor to detect.

  The air conditioner 2 includes a cooling coil 2-1, a heating coil 2-2, a humidifier 2-3, and an air supply fan 2-4. The cooling coil 2-1 is connected to a cooling water valve CV1. Cold water is supplied, warm water is supplied to the heating coil 2-2 via the hot water valve CV2, and steam is supplied to the humidifier 2-3 via the steam valve CV3.

  For the air conditioner 2, an outside air fan F1, an exhaust fan F2, an outside air intake damper CAV1, an exhaust damper CAV2, an outside air introduction damper DP1, an air discharge damper DP2, a total heat exchanger 3, and an air conditioner A machine control device 4 is provided.

The total heat exchanger 3 is provided between the communication path L1 between the outside air fan F1 and the outside air intake damper CAV1, and the communication path L2 between the exhaust damper CAV2 and the exhaust fan F2, and the outside air taken in through the communication path L1. Total heat exchange is performed between OA _IN and exhaust EA _IN discharged through the communication path L2. The operation / stop of the total heat exchanger 3 is self-starting / stopping based on the temperature of the outside air OA _IN .

  The air conditioner control device 4 includes a humidity controller HIC and a temperature controller TIC. The air conditioner outlet temperature tSA detected by the supply air temperature sensor T2, the controlled room temperature tpv detected by the indoor temperature sensor T3, and the indoor humidity sensor H3 Based on the controlled room humidity Hpv to be detected, the amount of cold water to the cooling coil 2-1 via the cold water valve CV1, the amount of hot water to the hot water coil 2-2 via the hot water valve CV2, and a humidifier via the steam valve CV3 The amount of steam to 2-3 and the opening degree of the outside air introduction damper DP1 and the atmospheric discharge damper DP2 are controlled.

[Ensuring air quality and energy saving control using outside air]
Securing air quality and energy saving control using outside air in this air conditioning control system will be described using the time chart shown in FIG.

  4A shows a change in the temperature tMIX of the mixed air MIX1 between the return air (RA) returned to the air conditioner 2 and the outside air (OA) taken into the air conditioner 2, and FIG. 4 (c) shows the change in the mixing ratio of the outside air (OA) contained in the mixed air MIX1, and FIG. 4 (d) shows the operating condition of the total heat exchanger 3. Show.

  In FIGS. 4A, 4B, 4C, and 4D, the horizontal axis indicates the outside air temperature. Further, in this air conditioning control system, an air conditioner blow target temperature tSAsp (for example, tSAsp = 16 ° C.) is determined as a target value of the temperature of the conditioned air blown out from the air conditioner 2, and the temperature in the controlled target room 1 ( A controlled room target temperature tsp (for example, tsp = 23 ° C.) is determined as a target value of the room temperature.

  4, the outside air temperature is low, the outside air introduction damper DP1 and the atmosphere exhaust damper DP2 are fully closed, and the outside air intake damper CAV1 and the exhaust damper CAV2 have the predetermined opening (the same opening). It shall be said that. Further, it is assumed that the outside air fan F1 and the exhaust fan F2 are operated at a specified rotation speed (same rotation speed).

In this case, the return air RA0 from the controlled room 1 reaches the exhaust damper CAV2 as RA1, a part thereof is sent to the total heat exchanger 3 as exhaust EA _IN , and the rest is returned to the air conditioner 2 as return air RA3. It is. Further, the outside air OA _IN via the outside air fan F1 reaches the outside air intake damper CAV1 via the total heat exchanger 3, and all of it is sent to the air conditioner 2 as the outside air OA1.

Here, since the temperature of the exhaust EA _IN is higher than the temperature of the outside air OA _IN , the total heat exchanger 3 supplies the outside air OA _IN with the heat from the exhaust EA _IN , and the outside air OA _OUT to the outside air intake damper CAV1. Increase the temperature. Thereby, the effective use of exhaust heat is achieved.

  In the air conditioner 2, the return air RA3 returned from the controlled room 1 and the outside air OA1 from the outside air intake damper CAV1 are mixed, that is, the outside air OA1 is taken into the return air RA3 to be mixed air MIX1. Here, the mixing ratio of the outside air contained in the mixed air MIX1 is set to a predetermined value (20% in this example) by setting the outside air intake damper CAV1 and the exhaust damper CAV2 to the prescribed opening degrees.

  The mixed air MIX1 passes through the cooling coil 2-1, the heating coil 2-2, and the humidifier 2-3 in the air conditioner 2, and is blown out from the supply fan 2-4 to the controlled target chamber 1 as conditioned air. . In this case, since the outside air temperature is low, the temperature of the conditioned air blown out from the air conditioner 2 (air conditioner blow temperature) tSA is lower than the air conditioner blow target temperature tSAsp. Therefore, the air conditioner control device 4 does not supply cold water to the cooling coil 2-1. Moreover, since the mixing ratio of the outside air contained in the mixed air MIX1 is 20%, the air quality of the controlled chamber 1 is ensured.

When the outside air temperature rises and the air conditioner outlet temperature tSA becomes higher than the air conditioner outlet target temperature tSAsp, that is, the temperature tMIX of the mixed air MIX1. Becomes higher than the air conditioner blow target temperature tSAsp (point t1 shown in FIG. 4 (a)), the air conditioner control device 4 sets the cooling coil so that the air conditioner blow temperature tSA matches the air conditioner blow target temperature tSAsp. Supply of cold water to 2-1 is started. Further, the air conditioner control device 4 starts opening control (same opening control) of the outside air introduction damper DP1 and the air discharge damper DP2 according to the temperature difference Δtpv between the controlled room target temperature tsp and the controlled room temperature tpv. . Thereby, the introduction of the outside air OA2 into the mixed air MIX1 of the return air RA3 and the outside air OA1 is started, and the mixing ratio of the outside air contained in the mixed air MIX1 is increased.

  The outside air OA2 is sent directly to the air conditioner 2 via the outside air introduction damper DP1. Therefore, the temperature of the outside air OA2 is lower than the temperature of the outside air OA1 taken in via the outside air intake damper CAV1, and contributes to a decrease in the temperature tMIX of the mixed air MIX1. Thereby, the amount of cold water supplied to the cooling coil 2-1 can be reduced, and energy saving can be achieved accordingly. This control is called outside air introduction cooling control.

As the outside air temperature rises, the amount of outside air OA2 introduced through the outside air introduction damper DP1 increases, and the mixing ratio of outside air contained in the mixed air MIX1 increases accordingly. When the outside air introduction damper DP1 is fully opened, the amount of outside air OA2 introduced does not increase any more, and the outside air mixing ratio stops increasing (point t2 shown in FIG. 4C). In this example, the mixing ratio of the outside air stops at 50%, and the subsequent increase in the outside air temperature is dealt with only by supplying cold water to the cooling coil 2-1. The total heat exchanger 3 stops its operation when the temperature of the outside air OA _IN becomes high and reaches an intermediate period (point t3 shown in FIG. 4 (d)).

  Further, when the outside air temperature rises and a difference of a predetermined value or more starts to occur between the controlled room target temperature tsp and the controlled room temperature tpv, the air conditioner control device 4 becomes impossible to cool by introducing the outside air. It is determined that it has started, and the opening of the outside air introduction damper DP1 and the air discharge damper DP2 starts to be throttled (point t4 shown in FIG. 4C). Thereby, the introduction amount of the outside air OA2 is reduced, and the mixing ratio of the outside air contained in the mixed air MIX1 starts to decrease.

  As the outside air temperature rises, the openings of the outside air introduction damper DP1 and the atmosphere discharge damper DP2 are reduced and finally fully closed (point t5 shown in FIG. 4C). Thereby, the introduction amount of the outside air OA2 becomes 0, and the mixing ratio of the outside air contained in the mixed air MIX1 returns to 20%.

The total heat exchanger 3 starts operation when the temperature of the outside air OA _IN begins to exceed 23 ° C. during the summer (t5 point shown in FIG. 4 (d)). In this case, since the temperature of the exhaust EA _IN is lower than the temperature of the outside air OA _IN, is cold heat supply from the exhaust EA _IN to the outside air OA _IN, the temperature of the outside air OA _OUT to the outside air intake damper CAV1 is lowered. Thereby, the effective use of exhaust heat is achieved.

Japanese Patent Application Laid-Open No. 11-211190

However, in the conventional air conditioning control system described above, the outside air introduction cooling control is performed by changing the mixing ratio of the outside air contained in the mixed air MIX1, but the controlled room target temperature tsp and the controlled room temperature tpv Since the opening control of the outside air introduction damper DP1 and the air discharge damper DP2 is performed based on the temperature difference Δtpv of the air, the reaction to the outside air changes such as the temperature and humidity of the outside air is slow and a time delay has occurred. .
Also, despite an outside air introduction cooling control during the hyperthermia from the exhaust EA _IN to the outside air OA _IN is supplied by the total heat exchanger 3, since the temperature of the outside air OA1 is raised, that energy saving effect wanes There was also a problem.

The present invention has been made to solve such problems, and the object of the present invention is to react immediately to changes in the outside air, such as the temperature and humidity of the outside air, and to control the outside air introduction and cooling without time delay. The object is to provide an air conditioning control system capable of saving energy.
In addition, it responds immediately to changes in the outside air such as the temperature and humidity of the outside air, can save energy through outside air introduction cooling control without time delay, and stops the heat exchanger operation during outside air introduction cooling control. Thus, an object is to provide an air conditioning control system capable of further energy saving.

In order to achieve such an object, the first invention (the invention according to claim 1) is provided with predetermined air conditioners that supply conditioned air to the controlled room and return air that is returned from the controlled room to the air conditioner. In an air-conditioning control system comprising outside air intake means for taking in outside air at a mixing ratio of outside air based on the temperature difference between the target temperature (controlled room target temperature) determined for the room to be controlled and the temperature of the outside air Outside air introduction means for introducing outside air into the mixed air of return air and outside air created by the intake means is provided.
According to the present invention, new outside air is introduced into the mixed air of the return air and the outside air created by the outside air intake means based on the temperature difference between the controlled room target temperature and the outside air temperature, and is included in the mixed air. The mixing ratio of outside air changes. As a result, the mixing ratio of the outside air contained in the mixed air changes immediately in response to a change in the temperature of the outside air, and energy can be saved by the outside air introduction cooling control without time delay.

The second invention (the invention according to claim 2) is an air conditioner that supplies conditioned air to a controlled room and an outside air intake that takes in outside air at a predetermined mixing ratio to return air that is returned from the controlled room to the air conditioner. The return air and the outside air created by the outside air intake means based on the enthalpy difference between the target enthalpy (controlled room target enthalpy) determined for the controlled room and the enthalpy of the outside air. Outside air introduction means for introducing outside air into the mixed air is provided.
According to this invention, new outside air is introduced into the mixed air of the return air and the outside air created by the outside air intake means based on the enthalpy difference between the controlled room target enthalpy and the enthalpy of the outside air, and is included in the mixed air. The mixing ratio of outside air changes. As a result, the mixing ratio of the outside air contained in the mixed air changes immediately in response to the change in the enthalpy of the outside air, and it becomes possible to save energy by the outside air introduction cooling control without time delay. In the present invention, by taking the enthalpy difference instead of the temperature difference, it is possible to perform control in consideration of energy due to humidity.

According to a third invention (invention according to claim 3), in the first invention, a heat exchanger is provided for performing heat exchange between the outside air taken in by the outside air intake means and the return air discharged to take in the outside air. The operation / stop of the heat exchanger is controlled based on the temperature difference between the target temperature of the controlled room and the temperature of the outside air.
According to this invention, the operation / stop of the heat exchanger is controlled based on the temperature difference between the controlled room target temperature and the temperature of the outside air. Thus, the operation of the heat exchanger is stopped in synchronization with the start of the outside air introduction cooling control, and the operation of the heat exchanger is started in synchronization with the end of the outside air introduction cooling control. It is possible to further save energy by stopping the operation of the heat exchanger.

According to a fourth invention (invention according to claim 4), in the second invention, there is provided a heat exchanger for performing heat exchange between the outside air taken in by the outside air intake means and the return air discharged to take in the outside air. The operation / stop of the heat exchanger is controlled based on the enthalpy difference between the control room target enthalpy and the enthalpy of the outside air.
According to this invention, the operation / stop of the heat exchanger is controlled based on the enthalpy difference between the controlled room target enthalpy and the enthalpy of the outside air. Thus, the operation of the heat exchanger is stopped in synchronization with the start of the outside air introduction cooling control, and the operation of the heat exchanger is started in synchronization with the end of the outside air introduction cooling control. It is possible to further save energy by stopping the operation of the heat exchanger.

  According to the first invention, by providing the outside air introduction means for introducing the outside air into the mixed air of the return air and the outside air created by the outside air intake means based on the temperature difference between the controlled room target temperature and the temperature of the outside air, The mixing ratio of the outside air contained in the mixed air changes immediately in response to a change in the temperature of the outside air, and energy can be saved by the outside air introduction cooling control without time delay.

  According to the second invention, by providing the outside air introduction means for introducing the outside air into the mixed air of the return air and the outside air created by the outside air intake means based on the enthalpy difference between the controlled room target enthalpy and the enthalpy of the outside air, The mixing ratio of the outside air contained in the mixed air changes immediately in response to changes in the enthalpy of the outside air (changes in temperature and humidity), making it possible to save energy by controlling the outside air introduction and cooling without time delay.

According to the third aspect of the present invention, the operation of the heat exchanger during the outside air introduction cooling control is stopped by controlling the operation / stop of the heat exchanger based on the temperature difference between the controlled room target temperature and the temperature of the outside air. In this way, further energy saving can be achieved.
According to the fourth invention, the operation of the heat exchanger is controlled based on the enthalpy difference between the control room target enthalpy and the enthalpy of the outside air, thereby stopping the operation of the heat exchanger during the outside air introduction cooling control. Thus, further energy saving can be achieved.

[Embodiment 1]
Hereinafter, the present invention will be described in detail with reference to the drawings. FIG. 1 is a diagram showing an outline of an embodiment of an air conditioning control system according to the present invention. 3, the same reference numerals as those in FIG. 3 denote the same or equivalent components as those described with reference to FIG. 3, and the description thereof will be omitted. The total heat exchanger and the air conditioner control device in the present embodiment are partly different from the conventional one shown in FIG. 3 and are therefore shown as the total heat exchanger 3 ′ and the air conditioning control device 4 ′. ing.

  In this air conditioning control system, an outside air temperature sensor T1 for detecting the temperature tout of the outside air and a dew point meter H1 for detecting the dew point temperature of the outside air are provided in the outside air introduction path to the outside air fan F1, and this outside temperature sensor. The outside air temperature tout detected by T1 and the outside air dew point temperature dout detected by the dew point meter H1 are supplied to the outside air introduction cooling control device 5.

  Further, in this air conditioning control system, a variable air volume device VAV1 (outside air introduction VAV1) is provided instead of the outside air introduction damper DP1 shown in FIG. 3, and a variable air volume device VAV2 (atmosphere) instead of the air discharge damper DP2 shown in FIG. Exhaust VAV2) is provided, and the opening degree (passage air volume) of the outside air introduction VAV1 and the atmosphere emission VAV2 is controlled by the outside air introduction cooling control device 5.

  Further, in this air conditioning control system, an electric valve MD is provided in the introduction path of the return air RA3 to the air conditioner 2, and the opening degree of the electric valve MD is controlled by the outside air introduction cooling control device 5. The motor-operated valve MD is provided to facilitate the release of the return air RA2 from the atmospheric discharge VAV2 during the outside air introduction cooling control, and the opening degree control is opposite to that of the atmospheric discharge VAV2.

  In this air conditioning control system, a total heat exchanger 3 ′ capable of controlling the operation / stop from the outside is used, and the operation / stop of the total heat exchanger 3 ′ is controlled by the outside air introduction cooling control device 5. Like to do. In this embodiment, the outside air introduction cooling control device 5 is provided separately from the air conditioner control device 4 ′. However, the function of the outside air introduction cooling control device 5 may be added to the air conditioner control device 4 ′. Good. The function of the outside air introduction cooling control device 5 will be described later.

  The outside air introduction cooling control device 5 is realized by hardware including a processor and a storage device, and a program that realizes various functions as a control device in cooperation with these hardware, and has functions unique to the present embodiment. It is equipped with an outside air introduction cooling control function. Hereinafter, the outside air introduction cooling control function of the outside air introduction cooling control device 5 will be described according to the time chart shown in FIG.

FIG. 2A shows the temperature tMIX of the mixed air MIX1 of the return air (RA) returned to the air conditioner 2 and the outside air (OA) taken into the air conditioner 2. 2 (b) shows a state of supplying cold water to the cooling coil 2-1, FIG. 2 (c) shows a change in the mixing ratio of outside air (OA) contained in the mixed air MIX1, and FIG. 2 (d) shows the operating status of the total heat exchanger 3 ′. In FIG. 2A, tSAsp is an air conditioner blow target temperature, and tsp is a controlled room target temperature. 2 (a), (b), (c), and (d), the horizontal axis represents the outside air temperature. In this example, it is assumed that tSAsp = 16 ° C. and tsp = 23 ° C.

  Now, at the point t0 in FIG. 2, the outside air temperature is low, the outside air introduction VAV1 and the atmosphere discharge VAV2 are fully closed (passing air volume is 0), and the outside air intake damper CAV1 and the exhaust damper CAV2 have the specified opening degree (same as above). Opening degree). Further, it is assumed that the outside air fan F1 and the exhaust fan F2 are operated at a specified rotation speed (same rotation speed).

In this case, the return air RA0 from the controlled room 1 reaches the exhaust damper CAV2 as RA1, a part thereof is sent as exhaust EA _IN to the total heat exchanger 3 ′, and the rest as return air RA3 to the air conditioner 2. Returned. Further, the outside air OA _IN via the outside air fan F1 reaches the outside air intake damper CAV1 via the total heat exchanger 3 ′, and all of it is sent to the air conditioner 2 as the outside air OA1.

  The outside air introduction cooling control device 5 obtains a temperature difference Δtout (Δtout = tsp−tout) between the controlled room target temperature tsp and the outside air temperature tout, and when Δtout is larger than 35 ° C. (Δtout> 35 ° C.) or 0 When the temperature is smaller than ° C. (Δtout <0), an operation command is sent to the total heat exchanger 3 ′. On the other hand, when 0 ° C. ≦ Δtout ≦ 35 ° C., a stop command is sent to the total heat exchanger 3 ′.

Since Δtout> 35 ° C. at the point t0 in FIG. 2, the outside air introduction cooling control device 5 sends an operation command to the total heat exchanger 3 ′. By this operation of the total heat exchanger 3 'is supplied with heat from the exhaust EA _IN to the outside air OA _IN, the temperature of the outside air OA _OUT to the outside air intake damper CAV1 is raised. Thereby, the effective use of exhaust heat is achieved.

  In the air conditioner 2, the return air RA3 returned from the controlled room 1 and the outside air OA1 from the outside air intake damper CAV1 are mixed, that is, the outside air OA1 is taken into the return air RA3 to be mixed air MIX1. Here, the mixing ratio of the outside air contained in the mixed air MIX1 is set to a predetermined value (20% in this example) by setting the outside air intake damper CAV1 and the exhaust damper CAV2 to the prescribed opening degrees.

  The mixed air MIX1 passes through the cooling coil 2-1, the heating coil 2-2, and the humidifier 2-3 in the air conditioner 2, and is blown out from the supply fan 2-4 to the controlled target chamber 1 as conditioned air. . In this case, since the outside air temperature is low, the temperature of the conditioned air blown out from the air conditioner 2 (air conditioner blow temperature) tSA is lower than the air conditioner blow target temperature tSAsp. Therefore, the air conditioner control device 4 ′ does not supply cold water to the cooling coil 2-1. Moreover, since the mixing ratio of the outside air contained in the mixed air MIX1 is 20%, the air quality of the controlled chamber 1 is ensured.

  When the outside air temperature rises and the temperature difference Δtout between the controlled room target temperature tsp and the outside air temperature tout reaches 35 ° C. (point t1 shown in FIG. 2A), the outside air introduction cooling control device 5 A stop command is sent to 3 ', and the air volume control (same air volume control) of the outside air introduction VAV1 and the atmosphere discharge VAV2 corresponding to the temperature difference between the controlled room target temperature tsp and the outside air temperature tout is started. As a result, the operation of the total heat exchanger 3 'is stopped and the introduction of the outside air OA2 into the air conditioner 2 is started, and the mixing ratio of the outside air contained in the mixed air MIX1 is increased.

  In the present embodiment, the set air volume for the outside air introduction VAV1 and the atmospheric discharge VAV2 is determined as set air volume = (tsp−tout) × α + β. In this equation, α is a negative coefficient, β is a positive coefficient, and the set air volume is increased as the outside air temperature tout increases.

In this case, since the operation of the total heat exchanger 3 ′ is stopped, the supply of warm heat from the exhaust EA _IN to the outside air OA _IN is not performed, and the temperature of the outside air OA _OUT to the outside air intake damper CAV1 decreases. The outside air OA2 is directly introduced into the air conditioner 2 via the outside air introduction VAV1. As a result, an increase in the temperature tMIX of the mixed air MIX1 is suppressed, and it is not necessary to supply cold water to the cooling coil 2-1, thereby saving energy accordingly.

  As the outside air temperature rises, the amount of outside air OA2 introduced through the outside air introduction VAV1 increases, and the mixing ratio of outside air contained in the mixed air MIX1 increases accordingly. When the outside air introduction VAV1 is fully opened (maximum air volume), the introduction amount of the outside air OA2 does not increase any more, and the increase of the outside air mixing ratio stops (point t2 shown in FIG. 2C). In this example, the mixing ratio of outside air stops at 50%.

  When the increase in the outside air mixing ratio stops, the air conditioner outlet temperature tSA tends to become higher than the air conditioner outlet target temperature tSAsp as the outside air temperature rises. This is dealt with when the air conditioning control device 4 ′ supplies cold water to the cooling coil 2-1 so that the air conditioner outlet temperature tSA matches the air conditioner outlet target temperature tSAsp.

  When the outside air temperature further rises and the temperature difference Δtout between the controlled room target temperature tsp and the outside air temperature tout approaches 0, the outside air introduction cooling control device 5 determines that cooling by outside air introduction has started to be impossible, The air volume of the outside air introduction VAV1 and the air discharge VAV2 starts to be reduced (point t3 shown in FIG. 2C). Thereby, the introduction amount of the outside air OA2 to the air conditioner 2 is reduced, and the mixing ratio of the outside air contained in the mixed air MIX1 starts to decrease.

  As the temperature difference Δtout between the controlled room target temperature tsp and the outside air temperature tout approaches 0, the air volume of the outside air introduction VAV1 and the air discharge VAV2 is reduced and finally closed (the passing air volume is 0) ( T4 point shown in FIG. Thereby, the introduction amount of the outside air OA2 to the air conditioner 2 becomes 0, and the mixing ratio of the outside air contained in the mixed air MIX1 returns to 20%.

When the temperature difference Δtout between the controlled room target temperature tsp and the outside air temperature tout becomes smaller than 0 ° C. (Δtout <0), that is, when the outside air temperature tout becomes higher than the controlled room target temperature tsp, the outside air introduction cooling control device 5 Sends an operation command to the total heat exchanger 3 ′ (point t4 shown in FIG. 2 (d)). By the operation of the total heat exchanger 3 ', is cold heat supply from the exhaust EA _IN to the outside air OA _IN, the temperature of the outside air OA _OUT to the outside air intake damper CAV1 is lowered. Thereby, the effective use of exhaust heat is achieved.

  As can be seen from the above description, according to the air conditioning control system of the present embodiment, the air volume control of the outside air introduction VAV1 and the atmosphere discharge VAV2 is performed according to the temperature difference Δtout between the controlled room target temperature tsp and the outside air temperature tout. As a result, the mixing ratio of the outside air contained in the mixed air MIX1 changes immediately in response to a change in the temperature of the outside air, and energy can be saved by the outside air introduction cooling control without time delay.

  Further, according to the air conditioning control system of the present embodiment, when the temperature difference Δtout between the controlled room target temperature tsp and the outside air temperature tout is 0 ° C. ≦ Δtout ≦ 35 ° C., the total heat exchanger 3 ′ is stopped. As a result, the temperature of the outside air OA1 to the air conditioner 2 is not raised by the total heat exchanger 3 'in spite of the outside air introduction / cooling control, and the total heat exchanger 3' Further energy saving can be achieved by stopping the operation and lowering the temperature of the outside air OA1.

  Further, according to the air conditioning control system of the present embodiment, the temperature difference Δtout between the controlled room target temperature tsp and the outside air temperature tout is not the temperature difference Δtpv between the controlled room target temperature tsp and the controlled room temperature tpv. Since the mixing ratio of the outside air contained in the mixed air MIX1 is changed based on this, the air conditioner control device 4 ′ performs only the control to make the air conditioner outlet temperature tSA coincide with the air conditioner outlet target temperature tSAsp. In this case, the indoor temperature sensor T1 for detecting the controlled room temperature tpv can be removed from the controlled room 1.

[Embodiment 2]
In the embodiment described above, the air volume control of the outside air introduction VAV1 and the atmosphere discharge VAV2 is performed according to the temperature difference Δtout between the controlled room target temperature tsp and the outside air temperature tout. The air volume control of the outside air introduction VAV1 and the atmosphere discharge VAV2 is performed in accordance with the enthalpy difference between the target enthalpy (controlled room target enthalpy) and the outside air enthalpy so as to change the mixing ratio of the outside air contained in the mixed air MIX1. May be.

  In this case, based on the enthalpy difference between the target enthalpy of the controlled room and the enthalpy of the outside air, the operation of the total heat exchanger 3 ′ is stopped in synchronization with the start of the outside air introduction cooling control, and is synchronized with the end of the outside air introduction cooling control. By starting the operation of the total heat exchanger 3 ′, the operation of the total heat exchanger 3 ′ is stopped during the outside air introduction cooling control.

  The set air volume for the outside air introduction VAV1 and the air discharge VAV2 is determined as set air volume = (target controlled room target enthalpy−outdoor enthalpy) × α + β. In this equation, α is a negative coefficient, β is a positive coefficient, and the set air volume is increased as the enthalpy of outside air increases.

Further, the controlled room target enthalpy is obtained from the controlled target room target temperature and the controlled target room target humidity. The enthalpy of the outside air is obtained from the outside air temperature tout and the outside air dew point temperature dout. For reference, the calculation formula for enthalpy h is shown below.
h = (1.00 × t + (2.495 + 1.93 × t) × x) / (1 + t) (1)
Where t: dry bulb temperature [° C.], x: absolute humidity [kg / kg], h: enthalpy [kJ / kg].

It is a figure showing the outline of one embodiment of the air-conditioning control system concerning the present invention. It is a time chart for demonstrating the external air introduction cooling control in this air-conditioning control system. It is a figure which shows the outline of the conventional air conditioning control system. It is a time chart for demonstrating the external air introduction cooling control in the conventional air conditioning control system.

Explanation of symbols

  DESCRIPTION OF SYMBOLS 1 ... Control target room, 2 ... Air conditioner, 2-1 ... Cooling coil, 2-2 ... Heating coil, 2-3 ... Humidifier, 2-4 ... Air supply fan, CV1 ... Cold water valve, CV2 ... Hot water valve , CV3 ... steam valve, 3 '... total heat exchanger, 4' ... air conditioner control device, 5 ... outside air introduction cooling control device, F1 ... outside air fan, F2 ... exhaust fan, CAV1 ... outside air intake damper, CAV2 ... exhaust Damper, VAV1, VAV2 ... Variable air volume device (outside air introduction VAV, atmospheric discharge VAV), MD ... motor valve, T1 ... outside air temperature sensor, T2 ... supply air temperature sensor, T3 ... indoor temperature sensor, H1 ... dew point meter, H3 ... Indoor humidity sensor.

Claims (5)

In an air conditioning control system comprising an air conditioner for supplying conditioned air to a controlled room, and an outside air intake means for taking outside air at a predetermined mixing ratio into the return air returned from the controlled room to the air conditioner,
Outside air introduction means for introducing outside air into the mixed air of return air and outside air created by the outside air intake means based on a temperature difference between a target temperature determined for the controlled room and the temperature of the outside air An air conditioning control system characterized by that. In an air conditioning control system comprising an air conditioner for supplying conditioned air to a controlled room, and an outside air intake means for taking outside air at a predetermined mixing ratio into the return air returned from the controlled room to the air conditioner,
Outside air introduction means for introducing outside air into the mixed air of return air and outside air created by the outside air intake means based on the enthalpy difference between the target enthalpy determined for the controlled room and the enthalpy of the outside air An air conditioning control system characterized by that. In the air-conditioning control system according to claim 1,
A heat exchanger for exchanging heat between the outside air taken in by the outside air intake means and the return air discharged to take in the outside air;
An air-conditioning control system comprising: means for controlling operation / stop of the heat exchanger based on a temperature difference between a target temperature determined for the controlled room and the temperature of the outside air. In the air conditioning control system according to claim 2,
A heat exchanger for exchanging heat between the outside air taken in by the outside air intake means and the return air discharged to take in the outside air;
An air conditioning control system comprising: means for controlling operation / stop of the heat exchanger based on an enthalpy difference between a target enthalpy determined for the controlled room and an enthalpy of the outside air. In the air-conditioning control system described in any one of Claims 1-4,
A first damper provided in a conduction path for return air to be returned to the air conditioner;
A second damper whose opening degree is controlled so as to discharge the same amount of return air as the outside air introduced by the outside air introducing means;
An air conditioning control system comprising: means for controlling the opening degree of the first damper opposite to the opening degree of the second damper.

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