JP2010139164A - Air conditioning system - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To save energy of an air conditioning system equipped with an indirect expansion type air conditioning means and a direct expansion type air conditioning means and performing air-conditioning of the same room. <P>SOLUTION: An interior air conditioning system 5 includes a cooling water coil 22 to which cooling water is supplied in order to perform heat exchange with air, and a hot water coil 23 to which hot water is supplied in order to perform heat exchange with the air. A perimeter air conditioning system 6 includes a refrigerant circuit for performing the vapor compression refrigerating cycle, heat is exchanged between the refrigerant of the refrigerant circuit and the air, and the refrigerant is condensed, and the air is heated. When the interior air conditioning system 5 performs cooling operation and the perimeter air conditioning system 6 performs heating operation, a condensation temperature set value of the refrigerant of the perimeter air conditioning system 6 is reduced compared to the case where both of the air conditioning systems 5 and 6 perform heating operation. <P>COPYRIGHT: (C)2010,JPO&INPIT

Description

    The present invention relates to an air conditioning system that includes an inflating air conditioning unit and a direct expansion air conditioning unit to perform air conditioning in the same room.

Conventionally, an air conditioning system provided with a plurality of air conditioning means for air-conditioning a plurality of areas in the same room is known. For example, the air conditioning system of Patent Document 1 includes a first humidity control device that humidifies an indoor perimeter zone, a second humidity control device that humidifies an indoor interior zone, a first air conditioner that cools and heats an indoor perimeter zone, And a second air conditioner for cooling and heating the interior zone of the room.
JP 2006-329600 A

    By the way, in the air conditioning system as described above, as the first air conditioner on the perimeter side, one in which the refrigerant in the refrigerant circuit performing the vapor compression refrigeration cycle directly exchanges heat with air, that is, a so-called direct expansion type is often used. is there. In such a system, when the first air conditioner simply performs the heating operation and the second air conditioner simply performs the cooling operation, the air in the perimeter zone and the air in the interior zone are mixed to cause heat loss (ie, mixing loss). Will occur. For this reason, there is a problem that the energy efficiency of both air conditioners decreases and the energy saving performance of the entire system decreases.

    The present invention has been made in view of such a point, and an object of the present invention is to cool the first zone with an inflatable first air conditioner and to directly expand the second zone in the same room as the first zone. When heating with an air conditioner, the heat loss caused by mixing the air in both zones is prevented and energy saving is improved.

    In the first aspect of the invention, a cooling liquid is supplied, a cooling means (22) that cools the air by exchanging heat between the cooling liquid and air, a heating liquid is supplied, and the heating liquid and air exchange heat. The first air conditioning means (5) provided with a heating means (23) for heating the air, and the refrigerant in the refrigerant circuit for performing the vapor compression refrigeration cycle and air exchange heat to condense the refrigerant and heat the air. 2 air-conditioning means (6), and the first air-conditioning means (5) and the second air-conditioning means (6) are predicated on an air-conditioning system that performs air-conditioning in the first zone and the second zone in the same room, respectively. And when the said 1st air conditioning means (5) performs the cooling operation which supplies the said cooling air to the said 1st zone, the said 1st air conditioning means (5) uses the said heating air as the said air conditioning system of this invention. Changing means for changing the set value of the refrigerant condensing temperature in the heating operation in which the second air conditioning means (6) supplies the heated air to the second zone lower than when performing the heating operation to supply the first zone ( 50).

    In the first aspect, the first zone is cooled and heated by the first air conditioning means (5), and the second zone is heated by the second air conditioning means (6). When the first air conditioning means (5) performs the cooling operation and the second air conditioning means (6) performs the heating operation, the refrigerant condensing temperature set value in the second air conditioning means (6) is changed to a low value. The When the condensation temperature set value is lowered, the heating capacity of the second air conditioning means (6) is reduced, and the temperature of the air supplied to the second zone is lowered.

    In a second aspect based on the first aspect, the first air conditioning means (5) is configured so that the cooling temperature of the air by the cooling means (22) becomes a predetermined value during the cooling operation. A flow rate adjusting valve (26) for adjusting the amount of the coolant supplied to is provided. And the said change means (50) changes the setting value of the refrigerant | coolant condensing temperature in the heating operation of the said 2nd air conditioning means (6) low according to the opening degree of the said flow regulating valve (26).

    In the second aspect of the invention, as the cooling load in the first zone increases, the opening degree of the flow rate adjustment valve (26) increases and the cooling capacity in the cooling means (22) increases. Then, as the opening degree of the flow rate adjustment valve (26) increases, that is, as the cooling load in the first zone increases, the refrigerant condensation temperature set value in the heating operation of the second air conditioning means (6) decreases.

    According to the present invention, when the so-called intermediate expansion type first air conditioning means (5) performs the cooling operation and the so-called direct expansion type second air conditioning means (6) performs the heating operation, the second air conditioning means (6) The condensing temperature set value is reduced below the condensing temperature set when both air-conditioning means (5, 6) perform heating operation. Accordingly, the supply air temperature is low in the second zone, and the difference between the temperature of the perimeter zone and the temperature of the interior zone is relatively small. Therefore, the heat loss (namely, mixing loss) which arises when the air of the 1st zone and the air of the 2nd zone are mixed can be reduced. As a result, the energy efficiency of both air-conditioning means (5, 6) can be prevented from being lowered and the energy saving performance of the system can be improved.

    Hereinafter, embodiments of the present invention will be described in detail with reference to the drawings. The following embodiments are essentially preferable examples, and are not intended to limit the scope of the present invention, its application, or its use.

    The air conditioning system (1) of the present embodiment is for air conditioning an office room, for example. The air conditioning system (1) includes an interior air conditioning system (5), a perimeter air conditioning system (6), and a controller (50). The interior air conditioning system (5) and the perimeter air conditioning system (6) perform air conditioning of the interior zone and the perimeter zone, respectively. That is, the air conditioning system (1) of the present embodiment includes a plurality of air conditioning systems that air-condition different areas in the same space. The interior air conditioning system (5) and the perimeter air conditioning system (6) constitute a first air conditioning unit and a second air conditioning unit according to the present invention, respectively.

    The interior air conditioning system (5) includes an air supply system (10) for supplying conditioned air to the interior zone and a return air system (30) for circulating indoor air in the interior zone.

    The air supply system (10) includes an air supply channel (11) and an air conditioner (20). The air supply channel (11) receives outdoor air from one end that is an inflow end, and is supplied to the interior zone from the other end that is an outflow end. The other end of the air supply channel (11) is branched into a plurality (two in this embodiment) and connected to the room.

    An external air damper (12) is provided on one end side of the air supply channel (11). In addition, each air supply flow path (11) branched on the other end side is provided with a variable air volume device (14) as an air volume adjusting means according to the present invention. Although not shown, the variable air volume device (14) is an air supply amount adjusting means including a damper and a wind speed sensor. That is, in the variable air volume device (14), the opening degree of the damper is adjusted based on the measured value of the wind speed sensor so that the air flow rate (air volume) of each air supply channel (11) becomes a set value.

    The air conditioner (20) is provided downstream of the outside air damper (12) in the air supply channel (11). In the air conditioner (20), a filter (21), a cold water coil (22), a hot water coil (23), a humidifier (24), and an air supply fan (25) are arranged in this order from the upstream side. The filter (21) removes dust and the like in the passing air. The cold water coil (22) is supplied with cold water and exchanges heat with air to cool the air, and constitutes a cooling means according to the present invention. The hot water coil (23) is supplied with hot water, exchanges heat with air, and heats the air. The humidifier (24) is supplied with humidifying water and humidifies the air to a set humidity. In the cold water coil (22), the hot water coil (23), and the humidifier (24), the amount of water supplied is adjusted by changing the opening degree of the flow rate adjusting valves (26, 27, 28). The air supply fan (25) is configured to have a variable air volume by inverter control.

    The air supply system (10) includes a temperature / humidity sensor (13) and a room temperature sensor (15). The temperature / humidity sensor (13) is for detecting the temperature and humidity of air, and is provided on the downstream side of the air conditioner (20) in the air supply passage (11). The room temperature sensor (15) is for detecting the air temperature in the indoor perimeter zone.

    In the interior air conditioning system (5) of the present embodiment, water having a predetermined temperature cooled or heated by a heat source device such as a chiller is supplied to the cold water coil (22) and the hot water coil (23). And the cooling capability and heating capability in a chilled water coil (22) etc. are adjusted by the opening degree change of the flow regulating valve (26, 27) mentioned above. The humidifier (24) is supplied with steam for humidification.

    Thus, the interior air conditioning system (5) of this embodiment cools or heats a heat medium (water) cooled or heated by a heat source machine to exchange heat with air. That is, the interior air conditioning system (5) is constituted by a so-called interstitial air conditioner.

    The return air system (30) includes a return air channel (31). The return air flow path (31) has one end that is an inflow end connected to an interior zone in the room and the other end that is an outflow end connected to the upstream side of the air conditioner (20). That is, in the return air system (30) of the present embodiment, the exhausted air in the interior zone is conditioned by the air conditioner (20) and then supplied to the interior zone again.

    The return air flow path (31) is provided with a variable air volume device (33) and a temperature sensor (32). As with the air supply system (10), the variable air volume device (33) opens the valve based on the measured value of the wind speed sensor so that the air flow rate (air volume) in the return air passage (31) is constant. Is adjusted. The temperature sensor (32) is for detecting the air temperature, and is provided on the upstream side of the variable air volume device (33).

    On the other hand, the perimeter air conditioning system (6) includes an outdoor unit (41) and an indoor unit (42). The outdoor unit (41) and the indoor unit (42) constitute a so-called direct expansion refrigeration apparatus.

    Although not shown, the outdoor unit (41) is provided with a compressor, an expansion mechanism, an outdoor heat exchanger, and an outdoor fan, and the indoor unit (42) is provided with an indoor heat exchanger and an indoor fan. The compressor, the outdoor heat exchanger, the expansion mechanism, and the indoor heat exchanger are connected by piping to form a refrigerant circuit. In the refrigerant circuit, the refrigerant is reversibly circulated to perform a vapor compression refrigeration cycle.

    In the outdoor heat exchanger, outdoor air taken in by the outdoor fan exchanges heat with the refrigerant, and in the indoor heat exchanger, indoor air in the perimeter zone taken in by the indoor fan exchanges heat with the refrigerant. In the perimeter air conditioning system (6), the cooling operation and the heating operation are switched by switching the refrigerant circulation direction of the refrigerant circuit. In the cooling operation, the outdoor heat exchanger functions as a condenser and the indoor heat exchanger functions as an evaporator, and air cooled by the indoor heat exchanger is supplied to the perimeter zone. In the heating operation, the outdoor heat exchanger functions as an evaporator and the indoor heat exchanger functions as a condenser, and air heated by the indoor heat exchanger is supplied to the perimeter zone.

    The controller (50) controls the interior air conditioning system (5) and the perimeter air conditioning system (6), and is a changing means according to the present invention. The controller (50) receives detection signals from the temperature / humidity sensor (13) and the temperature sensor (32) and an opening signal of the flow rate adjustment valve (26, 27, 28). The controller (50) controls the air supply fan (25) and outputs a signal of the set air volume to the variable air volume device (14, 33). The controller (50) is configured to change the evaporating temperature set value or the condensing temperature set value of the refrigerant in the indoor heat exchanger based on the operating state. Detailed control operation of the controller (50) will be described later.

-Driving action-
Next, the operation of the air conditioning system (1) will be described. The interior air conditioning system (5) is configured to be able to switch between a cooling operation, a heating operation, and a humidifying operation. The perimeter air conditioning system (6) is configured to be switchable between a cooling operation and a heating operation. Here, representatively, the “first operation pattern” in which both the interior air conditioning system (5) and the perimeter air conditioning system (6) perform the cooling operation, and the interior air conditioning system (5) performs the humidifying operation and the perimeter air conditioning system. Three operation patterns, “second operation pattern” in which (6) performs cooling operation and “third operation pattern” in which the interior air conditioning system (5) performs cooling operation and the perimeter air conditioning system (6) performs heating operation. The control operation of the controller (50) in FIG.

<Control of the first operation pattern>
In the first operation pattern, the cooling operation is performed in both the interior air conditioning system (5) and the perimeter air conditioning system (6). This driving pattern is performed especially in summer.

    In the cooling operation of the interior air conditioning system (5), outdoor air flows into the air conditioner (20). In the air conditioner (20), outdoor air passes through the filter (21) and is then cooled by the cold water coil (22). The cooled air sequentially passes through the hot water coil (23) and the humidifier (24) and flows out of the air conditioner (20), and is supplied to the indoor interior zone. Thereby, the interior zone is cooled. The room air in the interior zone flows into the air conditioner (20) through the return air flow path (31) and merges with the outdoor air. The combined air is cooled by the cold water coil (22) as described above, and then supplied to the interior zone. Note that the flow rate adjustment valves (27, 28) of the hot water coil (23) and the humidifier (24) are fully closed.

    On the other hand, in the cooling operation of the perimeter air conditioning system (6), the indoor air in the perimeter zone is taken into the indoor unit (42), is cooled by exchanging heat with the refrigerant in the indoor heat exchanger, and then supplied to the perimeter zone. Thereby, the perimeter zone is cooled. In the indoor heat exchanger, the refrigerant exchanges heat with room air and evaporates at the evaporation temperature set value. In the outdoor unit (41), the taken outdoor air exchanges heat with the refrigerant in the outdoor heat exchanger, and the refrigerant condenses.

    In this first operation pattern, the controller (50) performs a control operation as shown in FIG. The controller (50) controls the variable air volume device (14) of the air supply system (10) (step ST1). Specifically, in the variable air volume device (14), the damper opening degree is controlled so that the air volume is predetermined according to the temperature difference between the room temperature set value of the interior zone and the detected temperature of the room temperature sensor (15). . The air volume of the variable air volume device (14) is determined to increase as the temperature difference increases.

    Next, the controller (50) performs air volume control of the air supply fan (25) (step ST2). Specifically, the air supply fan (25) is air volume controlled based on the air volume of the variable air volume device (14). The air volume of the air supply fan (25) increases as the air volume of the variable air volume device (14) increases.

    Next, the controller (50) controls the opening degree of the flow rate adjustment valve (26) for the cold water coil (22) (step ST3). Specifically, the opening degree of the flow rate adjusting valve (26) is controlled so that the temperature detected by the temperature / humidity sensor (13) becomes a predetermined value. That is, the opening degree of the flow rate adjusting valve (26) is adjusted so that the temperature of the supply air fan (25) is a predetermined value. For example, when the temperature detected by the temperature / humidity sensor (13) is lower than a predetermined value, the opening degree of the flow rate adjustment valve (26) is reduced, and the amount of cold water supplied to the cold water coil (22) is reduced. Conversely, when the temperature detected by the temperature / humidity sensor (13) is higher than a predetermined value, the opening degree of the flow rate adjustment valve (26) is increased, and the amount of cold water supplied to the cold water coil (22) is increased.

    Here, consider a case where the cooling load of the interior zone is reduced. When the cooling load in the interior zone decreases, the temperature difference between the room temperature set value and the temperature detected by the room temperature sensor (15) decreases. Then, the air volume of the variable air volume device (14) is reduced, and accordingly, the air volume of the air supply fan (25) is also reduced. When the air volume of the supply fan (25) decreases, the temperature detected by the temperature / humidity sensor (13) decreases. That is, when the air volume of the air supply fan (25) decreases, the air volume decreases in the cold water coil (22), and the degree of cooling with respect to the air increases by the decreased amount. When the temperature detected by the temperature / humidity sensor (13) decreases, the opening degree of the flow rate adjustment valve (26) is decreased so that the detected temperature increases to a predetermined value. Then, the controller (50) changes the refrigerant evaporation temperature set value of the perimeter air conditioning system (6) based on the decreased opening of the flow rate adjustment valve (26) (step ST4). Specifically, the evaporation temperature set value is increased by a predetermined amount corresponding to the opening degree of the flow rate adjusting valve (26) after the decrease. When the evaporation temperature set value increases, the supply temperature of air from the indoor unit (42) increases. That is, the cooling capacity of the perimeter air conditioning system (6) decreases.

    Conversely, when the cooling load in the interior zone increases, the temperature difference between the room temperature set value and the temperature detected by the room temperature sensor (15) increases, the air volume of the variable air volume device (14) increases, and the air supply fan ( The air volume of 25) is also increased. When the air volume of the supply fan (25) increases, the temperature detected by the temperature / humidity sensor (13) rises and the opening of the flow rate adjustment valve (26) increases. Then, the evaporating temperature set value is decreased by a predetermined amount corresponding to the opening degree of the increased flow regulating valve (26), the supply temperature of air from the indoor unit (42) is lowered, and the perimeter air conditioning system (6) Increases cooling capacity.

    As described above, the controller (50) determines the decrease or increase of the cooling load in the interior zone based on the opening degree of the flow regulating valve (26), and estimates the cooling load in the perimeter zone based on that, and the perimeter air conditioning system (6) Increase or decrease the evaporating temperature setting value. That is, in the first operation pattern, as the cooling load of the interior air conditioning system (5) increases or decreases, the evaporating temperature set value of the perimeter air conditioning system (6) is increased or decreased to increase or decrease the cooling capacity of the perimeter air conditioning system (6). I made it. Thereby, since the capability of the perimeter air conditioning system (6) can be changed according to the cooling load, energy saving of the entire system can be achieved.

<Control of the second operation pattern>
In the second operation pattern, the humidification operation is performed in the interior air conditioning system (5), and the cooling operation is performed in the perimeter air conditioning system (6). This driving pattern is especially carried out from autumn to winter.

    In humidification operation of the interior air conditioning system (5), outdoor air that has flowed into the air conditioner (20) passes through the filter (21), the cold water coil (22), and the hot water coil (23) in that order, and then the humidifier (24). Humidified. The humidified air flows out of the air conditioner (20) and is supplied to the interior zone. Thereby, humidification of the interior zone is performed. Moreover, the point which the indoor air of an interior zone flows in into an air conditioner (20) through a return air flow path (31), and merges with outdoor air is the same as that of the 1st operation pattern mentioned above. Note that one of the flow rate adjustment valves (26, 27) of the cold water coil (22) and the hot water coil (23) is open according to the indoor load.

    On the other hand, the cooling operation of the perimeter air conditioning system (6) is the same as the first operation pattern described above.

    In this second operation pattern, the controller (50) performs a control operation as shown in FIG. The controller (50) controls the opening degree of the flow rate adjustment valve (28) for the humidifier (24) (step ST21). Specifically, the opening degree of the flow rate adjusting valve (28) is controlled so that the detected humidity of the temperature / humidity sensor (13) becomes a predetermined value. That is, the opening degree of the flow rate adjusting valve (28) is adjusted so that the humidity of the air blown from the air supply fan (25) becomes a predetermined value. For example, when the detected humidity of the temperature / humidity sensor (13) is lower than a predetermined value, the opening degree of the flow rate adjusting valve (28) is increased, and the supply amount of humidifying steam in the humidifier (24) is increased. Conversely, when the detected humidity of the temperature / humidity sensor (13) is higher than a predetermined value, the opening degree of the flow rate adjustment valve (28) is decreased, and the supply amount of humidifying steam in the humidifier (24) is decreased. The air volume of the variable air volume device (14) and the air supply fan (25) is constant.

    Next, the controller (50) changes the evaporating temperature setting value of the perimeter air conditioning system (6) according to the opening degree of the flow rate adjusting valve (28) (step ST22). Specifically, the larger the opening degree of the flow rate adjustment valve (28), the larger the evaporation temperature set value. That is, the larger the humidification load in the interior zone, the greater the evaporation temperature set value. The evaporation temperature set value in the second operation pattern is set to a relatively higher value than the evaporation temperature set value in the first operation pattern described above. When the evaporation temperature set value increases, the blown air temperature of the indoor unit (42) increases. Thereby, the fall of the relative humidity by a cooling operation in a perimeter zone is suppressed. Therefore, the humidification load in the interior zone is reduced, and the interior air conditioning system (5) and the entire system can be saved.

<Control of third operation pattern>
In the third operation pattern, the cooling operation is performed in the interior air conditioning system (5), and the heating operation is performed in the perimeter air conditioning system (6). This driving pattern is performed especially in winter.

    The cooling operation of the interior air conditioning system (5) is the same as the first operation pattern described above.

    In the heating operation of the perimeter air conditioning system (6), the indoor air in the perimeter zone is taken into the indoor unit (42), heated by exchanging heat with the refrigerant in the indoor heat exchanger, and then supplied to the perimeter zone. Thereby, heating of a perimeter zone is performed. In the indoor heat exchanger, the refrigerant exchanges heat with room air and condenses at the condensation temperature set value. In the outdoor unit (41), the outdoor air taken in exchanges heat with the refrigerant in the outdoor heat exchanger, and the refrigerant evaporates.

    In this third operation pattern, the controller (50) performs a control operation as shown in FIG. The controller (50) performs control (step ST11) of the variable air volume device (14) of the air supply system (10) and air volume control (step ST12) of the air supply fan (25) in the same manner as the first operation pattern described above. Do each.

    Next, the controller (50) controls the opening degree of the flow rate adjustment valve (26) for the cold water coil (22) (step ST13). Specifically, the opening degree of the flow rate adjusting valve (26) is controlled so that the temperature detected by the temperature / humidity sensor (13) becomes a predetermined value. That is, the opening degree of the flow rate adjusting valve (26) is adjusted so that the temperature of the supply air fan (25) is a predetermined value. For example, when the temperature detected by the temperature / humidity sensor (13) is lower than a predetermined value, the opening degree of the flow rate adjustment valve (26) is increased, and the amount of cold water supplied to the cold water coil (22) is increased. Conversely, when the temperature detected by the temperature / humidity sensor (13) is higher than a predetermined value, the opening degree of the flow rate adjustment valve (26) is decreased, and the amount of cold water supplied to the cold water coil (22) is decreased.

    Next, the controller (50) changes the condensing temperature setting value of the perimeter air conditioning system (6) (step ST14). The controller (50) requires that the flow regulating valve (26) for the chilled water coil (22) is open and that the refrigerant circulates in the heating cycle in the refrigerant circuit of the perimeter air conditioning system (6). As described above, the condensation temperature set value of the perimeter air conditioning system (6) is decreased. That is, when the interior air conditioning system (5) performs the cooling operation and the perimeter air conditioning system (6) performs the heating operation, the controller (50) decreases and changes the condensing temperature set value of the perimeter air conditioning system (6). For example, when both the interior air conditioning system (5) and the perimeter air conditioning system (6) perform heating operation, if the condensation temperature set value of the perimeter air conditioning system (6) is set at a constant α ° C, the α ° C To a predetermined β ° C. (<α ° C.).

    When the condensation temperature set value is decreased, the temperature of the air blown from the indoor unit (42) is lowered. Then, while performing the heating operation in the perimeter zone, the difference between the temperature of the perimeter zone and the temperature of the interior zone becomes relatively small. Thereby, the heat loss (namely, mixing loss) which arises by mixing the air of an interior zone and the air of a perimeter zone can be reduced. Therefore, energy saving of the interior air conditioning system (5) and the perimeter air conditioning system (6) can be achieved.

    In addition, although the value of β may be constant, it may be changed according to the opening degree of the flow rate adjustment valve (26) for the cold water coil (22). For example, you may set so that the value of (beta) may become small as the opening degree of a flow regulating valve (26) becomes large. That is, as the cooling capacity (cooling load) of the interior air conditioning system (5) increases, it may be decreased to a lower condensing temperature set value. Thereby, the temperature of the air blown from the indoor unit (42) can be lowered in accordance with the temperature of the interior zone, and the difference between the temperature of the perimeter zone and the temperature of the interior zone can be accurately reduced. As a result, heat loss due to mixing of air in both zones can be effectively reduced.

-Effect of the embodiment-
In this embodiment, when the interior air conditioning system (5) performs the cooling operation and the perimeter air conditioning system (6) performs the heating operation, the condensation temperature set value of the perimeter air conditioning system (6) is set to the both air conditioning systems (5, 6). Is set to be lower than the condensation temperature set when heating operation is performed. Therefore, the supply air temperature is low in the perimeter zone, and the difference between the temperature of the perimeter zone and the temperature of the interior zone is relatively small. Therefore, the heat loss (namely, mixing loss) which arises when the air of an interior zone and the air of a perimeter zone mix can be reduced. Therefore, energy saving of the system can be achieved.

    In addition, according to the present embodiment, when both the interior air conditioning system (5) and the perimeter air conditioning system (6) perform cooling operation, the perimeter air conditioning system (6) is changed according to the cooling load of the interior air conditioning system (5). The evaporation temperature set value was changed. Therefore, when the cooling load of the interior air conditioning system (5) decreases, the evaporating temperature set value can be increased. When the evaporation temperature increases in the refrigeration cycle of the perimeter air conditioning system (6), the COP (coefficient of performance) improves. Therefore, energy saving of the system can be achieved.

    If the evaporating temperature is not increased and changed, relatively low temperature air is supplied to the perimeter zone. Then, the low-temperature air flows into the interior zone, and comfort is impaired by the draft in the interior zone. However, in this embodiment, since the evaporation temperature is increased and changed, the supply air temperature in the perimeter zone increases. Thereby, the inflow of air from the perimeter zone to the interior zone can be prevented, and comfort can be improved.

    In the present embodiment, when the interior air conditioning system (5) performs a humidifying operation and the perimeter air conditioning system (6) performs a cooling operation, the perimeter air conditioning is performed according to the humidification load (latent heat load) of the interior air conditioning system (5). The evaporating temperature setting value of the system (6) was changed. Therefore, when the humidification load of the interior air conditioning system (5) increases, the evaporating temperature set value can be increased. Thereby, in the perimeter zone, the supply air temperature rises, so that the dehumidifying action is reduced. Therefore, it is possible to prevent the humidification load in the interior zone from increasing due to the cooling operation of the perimeter air conditioning system (6). Furthermore, in the perimeter air conditioning system (6), the evaporation temperature increases, so the COP (coefficient of performance) is improved. As a result, energy saving of the system can be achieved.

<< Other Embodiments >>
About the said embodiment, it is good also as the following structures.

    For example, in the third operation pattern of the above embodiment, the condensing temperature set value β may be changed according to the air volume of the variable air volume device (14), not the opening degree of the flow rate adjustment valve (26). That is, any means may be used as long as it can determine the cooling load in the interior zone.

    As described above, the present invention is useful for an air conditioning system including a plurality of air conditioning units that perform air conditioning in the same room.

FIG. 1 is a piping system diagram illustrating an overall configuration of an air conditioning system according to an embodiment. FIG. 2 is a flowchart showing the control operation of the first operation pattern. FIG. 3 is a flowchart showing the control operation of the second operation pattern. FIG. 4 is a flowchart showing the control operation of the third operation pattern.

Explanation of symbols

1 Air conditioning system
5 Interior air conditioning system (first air conditioning means)
6 Perimeter air conditioning system (second air conditioning means)
22 Chilled water coil (cooling means)
50 Controller (Change means)

Claims (2)

Cooling means (22) that cools the air by supplying a coolant and heat-exchanges the coolant and air; heating that heats the air by supplying heat and heat-exchanges the air and heat First air conditioning means (5) comprising means (23), and second air conditioning means (6) for heat exchange between the refrigerant and the air in the refrigerant circuit for performing the vapor compression refrigeration cycle by heat exchange between the refrigerant and air. An air conditioning system in which the first air conditioning means (5) and the second air conditioning means (6) perform air conditioning in the first zone and the second zone in the same room, respectively.
When the first air conditioning means (5) performs a cooling operation for supplying the cooling air to the first zone, the first air conditioning means (5) performs a heating operation for supplying the heated air to the first zone. The second air conditioning means (6) includes a changing means (50) for changing the set value of the refrigerant condensing temperature in the heating operation for supplying the heated air to the second zone to be lower than that when performing. Air conditioning system. In claim 1,
The first air conditioning means (5) is a flow rate adjusting valve that adjusts the amount of coolant supplied to the cooling means (22) so that the cooling temperature of the air by the cooling means (22) becomes a predetermined value during the cooling operation. (26)
The air conditioner characterized in that the change means (50) changes the set value of the refrigerant condensing temperature in the heating operation of the second air conditioner means (6) to a low value according to the opening of the flow rate adjusting valve (26). system.

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