JP7350503B2 - air conditioning system - Google Patents

Description

The present invention relates to an air conditioning system that air-conditions a space to be air-conditioned.

The above air conditioning system calculates the target evaporation temperature in the refrigeration cycle by performing various calculations in order to process the sensible heat load and latent heat load in the air-conditioned space, and the evaporation temperature in the evaporator is the calculated target evaporation temperature. The refrigeration cycle is controlled (compressor rotational speed control, expansion valve opening degree control, blower control, etc.) so that (see, for example, Patent Document 1).

In the system described in Patent Document 1, various calculations for determining the target evaporation temperature are first performed using the outside air total heat load, the outside air sensible heat load, the indoor total heat load, the throughflow load, the indoor total heat load, and the indoor total heat load. Find the sensible heat ratio of the air-conditioned space using the sensible heat load, etc. Next, the maximum evaporation temperature that is the maximum value of the evaporation temperature range is determined based on the determined sensible heat ratio, target indoor temperature, and target indoor humidity. Finally, the target evaporation temperature is determined using the determined maximum evaporation temperature and the temperature difference between the actual indoor temperature and the target indoor temperature.

The latent heat load in the air-conditioned space may decrease due to changes in outside temperature and humidity, the number of people in the room, etc. If the latent heat load decreases in this way, the latent heat load will be processed excessively, and the actual indoor humidity will drop too much.

Therefore, in the system described in Patent Document 1, when the latent heat load decreases, the sensible heat ratio is corrected to approach the actual sensible heat ratio based on the difference between the actual indoor humidity and the target indoor humidity. This prevents the latent heat load from being handled excessively.

Patent No. 5355649

However, in the system described in Patent Document 1, when the sensible heat ratio is corrected, the maximum evaporation temperature is not only determined again based on the corrected sensible heat ratio, target indoor temperature, and target indoor humidity, but also , the target evaporation temperature must be determined using the determined maximum evaporation temperature and the temperature difference between the actual indoor temperature and the target indoor temperature. Therefore, in controlling the refrigeration cycle when the latent heat load decreases, many calculations must be performed before the target evaporation temperature, which is the control target, is determined, resulting in a complicated configuration.

In view of this situation, the main object of the present invention is to prevent processing of excessive latent heat load while simplifying the configuration using a simple configuration when the latent heat load in the air-conditioned space decreases. The point is to provide air conditioning systems.

A first characteristic configuration of the present invention includes a supply air temperature adjustment section that adjusts the supply air temperature of air supplied to the air-conditioned space;
an air volume adjustment unit that adjusts the amount of air temperature-controlled by the supply air temperature adjustment unit supplied to the air-conditioned space;
a partial load target supply air temperature calculation unit that directly calculates a partial load target supply air temperature from a change in the sensible heat ratio according to the degree of decrease in the latent heat load when the latent heat load in the air-conditioned space decreases;
The operating state of the supply air temperature adjustment unit is controlled so that the supply air temperature of the air supplied to the air conditioned space becomes the target supply air temperature for the partial load when the latent heat load in the air conditioned space decreases. and an air conditioning control unit that performs partial load air conditioning control to control the operating state of the air volume adjustment unit according to the load state of the air-conditioned space ,
A normal target supply air temperature setting unit is provided that sets a normal target supply air temperature based on a sensible heat ratio corresponding to a normal latent heat load normally assumed in the air-conditioned space,
The air conditioning control section includes:
Controlling the operating state of the supply air temperature adjustment unit so that the supply air temperature of the air supplied to the air conditioned space becomes the normal target supply air temperature, and according to the load state of the air conditioned space, Performing normal air conditioning control to control the operating state of the air volume adjustment section,
When the latent heat load in the air-conditioned space decreases during execution of the normal air conditioning control, switching from the normal air conditioning control to the partial load air conditioning control,
The normal target supply air temperature setting section determines a state indicating a state change due to temperature control processing by the temperature control section of the supply air temperature adjustment section from the indoor state point of the air-conditioned space with respect to the relationship between absolute humidity and dry bulb temperature. The change relationship is compared with the sensible heat ratio correspondence relationship that corresponds to the sensible heat ratio under the normal latent heat load from the indoor state point of the air-conditioned space, and the dry bulb temperature at which the relationships match is determined as the target supply for normal use. Set the temperature to
A partial load relationship is set in advance in which an increase width for increasing the normal target supply air temperature is set relative to a decrease width of indoor humidity in the air-conditioned space,
The partial load target supply air temperature calculation unit calculates the partial load target supply air temperature based on the range of decrease in indoor humidity in the air-conditioned space using a preset partial load relationship. At the point.

According to this configuration, when the latent heat load in the air-conditioned space decreases, the target supply air temperature calculation unit for partial load calculates the target supply air temperature for partial load based on the change in the sensible heat ratio according to the degree of decrease in the latent heat load. Since the air temperature is directly determined, the target supply air temperature for partial load can be easily determined using a simple calculation configuration. When the latent heat load in the air conditioned space decreases, the air conditioning control unit performs partial load air conditioning control, so that air at the target supply air temperature for partial load corresponding to the decreased latent heat load is supplied to the air conditioned space. While supplying the air, the amount of air supplied can be adjusted, and the load on the air-conditioned space can be appropriately handled while preventing excessive latent heat load from being handled.

Further, according to this configuration, the normal target supply air temperature setting section sets the normal target supply air temperature based on the sensible heat ratio according to the normal latent heat load (for example, maximum latent heat load) in the air-conditioned space. Therefore, it is possible to appropriately set the normal target supply air temperature corresponding to the normal latent heat load in the air-conditioned space. By the air conditioning control unit performing normal air conditioning control, it is possible to appropriately process the load in the air conditioned space while processing the normal latent heat load in the air conditioned space.

Moreover, even if the latent heat load decreases due to a decrease in the number of people in the room while the air conditioning control unit is performing normal air conditioning control, the air conditioning control unit switches from normal air conditioning control to partial load air conditioning control, so that excess latent heat It is possible to appropriately process the load in the air-conditioned space while preventing the load from being processed.

A second characteristic configuration of the present invention is that, when the latent heat load in the air-conditioned space increases during execution of the partial load air conditioning control, the air conditioning control section switches from the partial load air conditioning control to the normal air conditioning control. be.

According to this configuration, even if the latent heat load increases due to an increase in the number of people in the room while the air conditioning control unit is executing partial load air conditioning control, the air conditioning control unit switches from partial load air conditioning control to normal air conditioning control. Since the switching is performed, it is possible to appropriately process the load in the air-conditioned space while preventing insufficient treatment of the latent heat load.

Diagram showing the schematic configuration of the air conditioning system Humid-air diagram showing the state points when setting the target supply air temperature for normal use Hygropsychrometric diagram showing the state points when the latent heat load decreases Flowchart showing the operation of the air conditioning control unit

Embodiments of an air conditioning system according to the present invention will be described based on the drawings.
As shown in Fig. 1, this air conditioning system includes an air conditioner 2 (corresponding to a supply air temperature adjustment section) that adjusts the supply air temperature of air supplied to an air conditioned space 1, and a temperature control unit that uses the air conditioner 2. A variable air volume unit 3 that adjusts the supply amount of conditioned air SA (supply air) to the air conditioned space 1, and an air conditioner that controls the operation of the air conditioning system by controlling the operating state of the air conditioner 2 and variable air volume unit 3. A control section 4 is also provided.

The air conditioning system has an air supply path 5 that serves as a flow path for air to flow through, and supplies conditioned air SA whose temperature has been adjusted by an air conditioner 2 to an air-conditioned space 1, and a return air RA from the air-conditioned space 1. A return air passage 6 for returning air to the air conditioner 2 and an outside air introduction passage 7 for supplying outside air OA to the air conditioner 2 are provided.

The air supply path 5 has an upstream end connected to the air conditioner 2, and a downstream portion branched into a first branch air supply path 5a and a second branch air supply path 5b. A variable air volume unit 3 is arranged in each of the first branch air supply path 5a and the second branch air supply path 5b. The number of flow paths into which the downstream portion of the air supply path 5 is branched can be changed as appropriate. For example, the number of flow paths can be changed depending on the size of the air-conditioned space 1.

The return air passage 6 is open to the ceiling space 8 of the air-conditioned space 1 and is configured to supply return air RA from the air-conditioned space 1 to the air conditioner 2 through the ceiling space 8. In addition to the return air path 6, an outside air introduction path 7 is connected to the air conditioner 2, and outside air OA can be supplied to the air conditioner 2 through the outside air introduction path 7.

The air conditioner 2 is arranged, for example, in a space adjacent to the air-conditioned space 1. The air conditioner 2 includes an air conditioning fan 21 and a temperature control section 22 that controls the temperature of air supplied by the operation of the air conditioning fan 21. By operating the air conditioning fan 21, return air RA is supplied to the air conditioner 2 through the return air passage 6, and outside air OA is supplied through the outside air introduction passage 7. However, the present invention is not limited to this, and only the return air RA may be supplied to the air conditioner 2 through the return air path 6 without introducing the outside air OA through the outside air introduction path 7.

The temperature control unit 22 is configured to control the temperature of a mixture of return air RA and outside air OA (or only return air RA). The temperature control unit 22 is configured with a cold/hot water coil that exchanges heat between a heat medium (for example, cold water or hot water) that is circulated and supplied from a heat source device (not shown) and supplied air, and performs cooling processing on the supplied air. Or heat treated. Incidentally, the temperature control section 22 can also be configured with a cooling coil that cools the supplied air.

The air conditioning control section 4 controls the temperature control section 22 by controlling the amount of heat medium supplied to the temperature control section 22 . The air conditioning control unit 4 controls the operating status of the air conditioner 2 by controlling the operating status of the air conditioning fan 21 and controlling the temperature adjusting unit 22 so that the temperature of the conditioned air SA becomes the target supply air temperature. are doing.

The variable air volume unit 3 includes, for example, a damper that can freely adjust the flow area of the air supply path 5, and by adjusting the flow area of the air supply path 5, the conditioned air SA is directed to the air-conditioned space 1. The air supply volume can be adjusted freely. The air conditioning control unit 4 controls the air flow rate of the conditioned air SA to the air conditioned space 1 based on the air conditioning state (load state) of the air conditioned space 1 so that the indoor temperature of the air conditioned space 1 reaches the set temperature. It is controlled by a variable air volume unit 3. Here, the indoor temperature of the air-conditioned space 1 can be the temperature detected by the temperature sensor T arranged in the air-conditioned space 1, and the set temperature can be the temperature set by the user's remote control operation etc. can.

In addition to the variable air volume unit 3, the air conditioning control unit 4 controls the operating state of the air conditioning fan 21 to direct the conditioned air SA to the air conditioned space 1 so that the indoor temperature of the air conditioned space 1 reaches the set temperature. The supply air volume is adjusted. The variable air volume unit 3 sets a target opening degree of the damper so that the indoor temperature of the air-conditioned space 1 reaches a set temperature, and controls the opening degree of the damper to the set target opening degree. The air conditioning control unit 4 acquires information regarding the target opening degree set in the variable air volume unit 3 through communication or the like, and determines the required air volume in the variable air volume unit 3 based on the target opening degree. The air conditioning control unit 4 determines the required air volume for each of the plurality of variable air volume units 3, and controls the rotational speed of the air conditioning fan 21 so that the total air volume of these required air volumes is supplied from the air conditioner 2. . In this way, the air conditioning control unit 4 controls the operating state of the variable air volume unit 3 and the air conditioning fan 21, thereby controlling the air flow rate of the conditioned air SA to the air conditioned space 1. The indoor temperature is kept at a set temperature, and the variable air volume unit 3 and air conditioning fan 21 correspond to an air volume adjustment section.

When the air conditioning control unit 4 controls the rotational speed of the air conditioning fan 21, if the target opening degree of the variable air volume unit 3 is within the low opening side range, the air conditioning control unit 4 controls the rotational speed of the air conditioning fan 21 to a low rotational speed. Decreasing side correction is performed to reduce the speed by a predetermined correction amount. In this case, if there is even one variable air volume unit 3 whose target opening degree is on the high opening side, the air conditioning control section 4 does not perform the lowering side correction. Further, when the target opening degree of the variable air volume unit 3 is within the high opening degree range, the air conditioning control unit 4 performs an increasing correction to increase the rotational speed of the air conditioning fan 21 toward the high rotational speed side by a predetermined correction amount. Is going. In this way, even if the target opening degree of the variable air volume unit 3 is outside the predetermined range, the air conditioning control unit 4 can control the rotational speed of the air conditioning fan 21 while performing the downward correction or the upward correction. , the amount of air supplied to the air-conditioned space 1 of the conditioned air SA can be appropriately controlled.

The air conditioning control unit 4 controls the operating state of the air conditioner 2 so that the supply air temperature of the air supplied to the air conditioned space 1 becomes the normal target supply air temperature, and also controls the load state of the air conditioned space 1. It is configured to perform normal air conditioning control that controls the operating states of the variable air volume unit 3 and the air conditioning fan 21 of the air conditioner 2 in accordance with the above.

The air conditioning control unit 4 includes a normal target supply air temperature setting unit 9 that sets a normal target supply air temperature in normal air conditioning control. The normal target supply air temperature setting unit 9 sets the normal target supply air temperature based on the sensible heat ratio according to the normal latent heat load normally assumed in the air-conditioned space 1. As a result, in normal air conditioning control, while supplying air at the normal target supply air temperature to the air conditioned space 1, the indoor temperature of the air conditioned space 1 becomes the set temperature according to the load state of the air conditioned space 1. Thus, the amount of air supplied to the air-conditioned space 1 is controlled.

The air-conditioned space 1 is assumed to be, for example, a conference room or an office that can be used by a large number of people, and the latent heat load when the air-conditioned space 1 is used by the maximum number of people is the normal latent heat load. The maximum latent heat load of space 1 is the normal latent heat load. Therefore, the normal target supply air temperature setting unit 9 sets the normal target supply air temperature based on the sensible heat ratio according to the normal latent heat load (for example, maximum latent heat load) in the air-conditioned space 1. The normal target supply air temperature corresponding to the normal latent heat load in the air-conditioned space 1 can be appropriately set.

How to set the target supply air temperature for normal use will be explained based on FIG. 2 which is a psychrometric diagram. In Figure 2, the vertical axis is absolute humidity (kg/kg (DA)), the horizontal axis is dry bulb temperature (℃), and the sensible heat ratio K1 (=sensible heat/(sensible heat + latent heat)) and the saturation curve H etc. Although FIG. 2 shows the case where the air-conditioned space 1 is cooled, the normal target supply air temperature can be similarly set when the air-conditioned space 1 is heated.

In FIG. 2, the indoor state point in summer is designated as A1, and the outside air state point is designated as A2. In this embodiment, since return air RA and outside air OA are mixed, the state point of this mixture is set to A3. Since the air-fuel mixture is cooled by the cooling process performed by the temperature control section 22, a solid line B indicates a change in the state of the air-fuel mixture at the temperature control section 22. Further, since the air-fuel mixture is heated by heat generated by the air conditioning fan 21 and the like, a solid line C indicates a state change due to this heating. As a result, the conditioned air SA supplied from the air conditioner 2 changes state from A3 to A4 along the solid line B, and reaches a state point where the state changes along the solid line C.

Assuming that the latent heat load in the air-conditioned space 1 is a normal latent heat load (maximum latent heat load), the slope of the sensible heat ratio at that time is K1 (for example, 0.75), as shown on the left side of FIG. . Therefore, the normal target supply air temperature setting unit 9 sets a dotted line D1 having the same slope as the sensible heat ratio K1 so as to pass through the indoor state point A1, and finds the intersection E1 of the dotted line D1 and the solid line C. The dry bulb temperature F1 (for example, 14° C.) corresponding to the intersection E1 is set as the normal target supply air temperature. In this way, the normal target supply air temperature setting section 9 sets the normal target supply air temperature based on the sensible heat ratio according to the normal latent heat load.

In this way, the normal target supply air temperature setting section 9 uses the psychrometric diagram shown in FIG. The target supply air temperature for normal use is set in consideration of the above, but how to set the target supply air temperature for normal use can be changed as appropriate.

For example, the relationship between the sensible heat ratio and the target supply air temperature for normal use is set in advance through experiments, etc., and the target supply air temperature setting unit 9 for normal use sets the sensible heat ratio in advance according to the normal latent heat load. Using this relationship, the target supply air temperature for normal use can be set.

In addition, in FIG. 2, in addition to state changes due to cooling processing by the temperature control section 22, state changes due to heat generation of the air conditioning fan 21 etc. are considered, but only state changes due to cooling processing by the temperature control section 22 are considered. It is also possible to set the target supply air temperature for normal use.

In normal air conditioning control, air at a normal target supply air temperature is supplied to the air-conditioned space 1 . However, in the air-conditioned space 1, due to a change in the number of users, etc., the latent heat load may become a partial latent heat load that is smaller than the normal latent heat load. In this case, as shown in FIG. 3, which is a psychrometric diagram, excessive latent heat load processing is performed.

In Figure 3, the vertical axis is absolute humidity (kg/kg (DA)), the horizontal axis is dry bulb temperature (℃), and the sensible heat ratio K2 (=sensible heat/(sensible heat + latent heat)) and the saturation curve H etc. Assuming that the latent heat load in the air-conditioned space 1 is a partial latent heat load, the slope of the sensible heat ratio at that time is K2 (for example, 0.92), as shown on the left side of FIG. When a dotted line D2 having the same slope as the sensible heat ratio K2 is set to pass through the indoor state point A1, the intersection of the dotted line D2 and the saturation curve H becomes G1. Therefore, when normal air conditioning control is performed when the latent heat load of the air-conditioned space 1 is a partial latent heat load, the part corresponding to the intersection E1 and the intersection G1 (the part indicated by the arrow) processes excessive latent heat. That means you are doing it.

Therefore, when the latent heat load in the air-conditioned space 1 decreases, the air conditioning control unit 4 has a partial load that directly calculates the target supply air temperature for the partial load from a change in the sensible heat ratio according to the degree of decrease in the latent heat load. A target supply air temperature calculation section 10 is provided.

How to determine the target supply air temperature for partial load will be explained.
The relationship between the change in the sensible heat ratio according to the degree of reduction in the latent heat load and the target supply air temperature for partial load can be set in advance through experiments or the like. Therefore, the target supply air temperature for partial load calculation section 10 uses the amount of decrease in latent heat load and the relationship between the preset degree of decrease in latent heat load and the target supply air temperature for partial load. The target supply air temperature is directly determined. The sensible heat ratio (=sensible heat/(sensible heat + latent heat)) is the ratio of the sensible heat load to the total heat load, so if the latent heat load changes, the sensible heat ratio will also change according to the degree of change in the latent heat load. I will do it. Therefore, since the sensible heat ratio changes depending on the degree of decrease in latent heat load, by determining the target supply air temperature for partial load according to the amount of decrease in latent heat load, sensible heat ratio can be adjusted according to the degree of decrease in latent heat load. The target supply air temperature for partial load can be determined from the change in heat ratio.

The relationship between the preset degree of reduction in latent heat load and the target supply air temperature for partial load is, for example, when the indoor humidity decreases by 10%, the target supply air temperature for normal use is increased by 1°C. If the target supply air temperature for the load is set, and the indoor temperature decreases by 20%, the target supply air temperature for the partial load can be set to a temperature obtained by increasing the normal target supply air temperature by 2°C. In this way, if the range of decrease in indoor humidity is X%, the target supply air temperature for partial load can be set as the target supply air temperature for normal use by increasing it by Y°C, and % and Y°C can be changed and set according to various conditions such as the situation of the air-conditioned space 1.

In this way, the partial load target supply air temperature calculation unit 10 uses the amount of decrease in latent heat load and the relationship between the preset degree of decrease in latent heat load and the target supply air temperature for partial load. However, the target supply air temperature for partial loads can be directly determined from changes in the sensible heat ratio according to the degree of reduction in latent heat load, and various calculation methods can be applied. be able to.

Although not shown, for example, in FIG. 3, the intersection of the dotted line D2 set to pass through the indoor state point A1 and the solid line B indicating the change in the state of the air-fuel mixture in the temperature control section 22 is found, and the intersection corresponds to the point of intersection. The dry bulb temperature can be determined as the target supply air temperature for partial load. In addition to the target supply air temperature for normal use, the target supply air temperature for partial load is determined by taking into account the state change due to the cooling process by the temperature control unit 22 and the state change due to heat generation of the air conditioning fan 21, etc. You can also ask for it.

Furthermore, the relationship between the sensible heat ratio and the target supply air temperature for partial load is set in advance through experiments or the like, and the target supply air temperature calculation unit 10 for partial load calculates the sensible heat ratio according to the degree of decrease in the latent heat load. The target supply air temperature for partial load can be determined using the change in and the preset relationship.

When the latent heat load in the air-conditioned space 1 decreases, the air-conditioning control unit 4 sets the supply air temperature of the air supplied to the air-conditioned space 1 to the partial load target supply air temperature calculated by the partial load target supply air temperature calculation unit 10. The operating state of the air conditioner 2 is controlled so that the target supply air temperature is reached, and the operating state of the variable air volume unit 3 and the air conditioning fan 21 of the air conditioner 2 is controlled according to the load state of the air conditioned space 1. Partial load air conditioning control is performed. In partial load air conditioning control, while supplying air at the target supply air temperature for partial load to the air conditioned space 1, the indoor temperature of the air conditioned space 1 becomes the set temperature according to the load state of the air conditioned space 1. Thus, the amount of air supplied to the air-conditioned space 1 is controlled.

The operation of the air conditioning control section 4 will be explained based on the flowchart of FIG. 4.
When the user issues a command to start air conditioning operation by operating a remote control or the like, the air conditioning control section 4 starts air conditioning control. In the air conditioning control, the air conditioning control section 4 first performs normal air conditioning control (step #1). During execution of normal air conditioning control, if the latent heat load of the air conditioned space 1 decreases to a partial latent heat load, the air conditioning control unit 4 switches from normal air conditioning control to partial load air conditioning control (if Yes in step #2) , step #3). The air conditioning control unit 4 determines that the latent heat load of the air conditioned space 1 has decreased when the indoor humidity detected by the humidity sensor S installed in the air conditioned space 1 decreases by more than a set amount during normal air conditioning control. are doing.

When the latent heat load of the air-conditioned space 1 increases during execution of partial load air conditioning control, the air conditioning control unit 4 switches from partial load air conditioning control to normal air conditioning control (if Yes in step #4, step #5 ). The air conditioning control unit 4 determines that the latent heat load in the air conditioned space 1 has increased when the indoor humidity detected by the humidity sensor S increases by a set amount or more during execution of the partial load air conditioning control.

In this way, the air conditioning control unit 4 switches between normal air conditioning control and partial load air conditioning control, depending on the magnitude of the latent heat load in the air conditioning space 1, to appropriately process the load in the air conditioning space 1. I have to. When the user issues a command to stop the air conditioning operation by operating a remote controller or the like, the air conditioning control unit 4 stops the air conditioning control (normal air conditioning control or partial load air conditioning control).

[Another embodiment]
(1) In the above embodiment, when the start of air conditioning operation is commanded, the air conditioning control unit 4 first performs normal air conditioning control. If the latent heat load of the space 1 is a partial latent heat load, the air conditioning control unit 4 can first perform partial load air conditioning control.

(2) In the embodiment described above, it is determined that the latent heat load has decreased and that the latent heat load has increased based on the detection information of the humidity sensor S installed in the air-conditioned space 1. For example, Based on the number of users of the air-conditioned space 1, it can also be determined whether the latent heat load has decreased or whether the latent heat load has increased. By providing a device to identify the number of users such as a camera or a motion sensor that captures images of the air-conditioned space 1, it is possible to determine the number of users of the air-conditioned space 1, and when the number of users determined decreases, the latent heat load decreases. If the number of users increases, it can be determined that the latent heat load has increased.

(3) In the above embodiment, the air conditioning control unit 4 can freely adjust the amount of air supplied from the air conditioner 2 to the air conditioned space 1 by controlling the rotational speed of the air conditioning fan 21. Although an example has been shown in which the air volume adjustment unit that adjusts the amount of air supplied to the air conditioner is configured from the variable air volume unit 3 and the air conditioning fan 21, regarding the configuration for adjusting the amount of air supplied to the air conditioned space 1. can be changed as appropriate.

For example, in the above embodiment, the air conditioning control unit 4 can adjust the amount of air supplied to the air-conditioned space 1 by controlling the rotation speed of the air conditioning fan 21, so the variable air volume unit 3 is omitted. You can also do that. In this case, the air volume adjustment section can be configured by the air conditioning fan 21.

Further, unlike the above embodiment, the air conditioning control unit 4 maintains the rotational speed of the air conditioning fan 21 at a constant rotational speed, so that the amount of air supplied from the air conditioner 2 to the air-conditioned space 1 is set as a constant amount. You can leave it there. In this case, since the amount of air supplied to the air-conditioned space 1 can be adjusted by the variable air volume unit 3, the air volume adjustment section can be configured by the variable air volume unit 3.

1 Air conditioned space 2 Air conditioner (supply air temperature adjustment section)
3 Variable air volume unit (air volume adjustment section)
4 Air conditioning control unit 9 Normal target supply air temperature setting unit 10 Partial load target supply air temperature calculation unit 21 Air conditioning fan (air volume adjustment unit)

Claims (2)

a supply air temperature adjustment unit that adjusts the supply air temperature of the air supplied to the air-conditioned space;
an air volume adjustment unit that adjusts the amount of air temperature-controlled by the supply air temperature adjustment unit supplied to the air-conditioned space;
a partial load target supply air temperature calculation unit that directly calculates a partial load target supply air temperature from a change in the sensible heat ratio according to the degree of decrease in the latent heat load when the latent heat load in the air-conditioned space decreases;
The operating state of the supply air temperature adjustment unit is controlled so that the supply air temperature of the air supplied to the air conditioned space becomes the target supply air temperature for the partial load when the latent heat load in the air conditioned space decreases. and an air conditioning control unit that performs partial load air conditioning control to control the operating state of the air volume adjustment unit according to the load state of the air-conditioned space ,
A normal target supply air temperature setting unit is provided that sets a normal target supply air temperature based on a sensible heat ratio corresponding to a normal latent heat load normally assumed in the air-conditioned space,
The air conditioning control section includes:
Controlling the operating state of the supply air temperature adjustment unit so that the supply air temperature of the air supplied to the air conditioned space becomes the normal target supply air temperature, and according to the load state of the air conditioned space, Performing normal air conditioning control to control the operating state of the air volume adjustment section,
When the latent heat load in the air-conditioned space decreases during execution of the normal air conditioning control, switching from the normal air conditioning control to the partial load air conditioning control,
The normal target supply air temperature setting section determines a state indicating a state change due to temperature control processing by the temperature control section of the supply air temperature adjustment section from the indoor state point of the air-conditioned space with respect to the relationship between absolute humidity and dry bulb temperature. The change relationship is compared with the sensible heat ratio correspondence relationship that corresponds to the sensible heat ratio under the normal latent heat load from the indoor state point of the air-conditioned space, and the dry bulb temperature at which the relationships match is determined as the target supply for normal use. Set the temperature to
A partial load relationship is set in advance in which an increase width for increasing the normal target supply air temperature is set relative to a decrease width of indoor humidity in the air-conditioned space,
The partial load target supply air temperature calculation unit calculates the partial load target supply air temperature based on the range of decrease in indoor humidity in the air-conditioned space using a preset partial load relationship. Air conditioning system. The air conditioning system according to claim 1 , wherein the air conditioning control unit switches from the partial load air conditioning control to the normal air conditioning control when a latent heat load in the air conditioning target space increases during execution of the partial load air conditioning control.

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