JP7002918B2 - Ventilation system, air conditioning system, ventilation method and program - Google Patents

Description

The present invention relates to ventilation systems, air conditioning systems, ventilation methods and programs.

In recent years, it has become a problem that the refrigerant used for air conditioning equipment is directly released into the atmosphere, which gives a warming effect several thousand times that of carbon dioxide having the same mass. Due to the high GWP (global warming potential) of the refrigerant, regulations on the amount of refrigerant used in air conditioning equipment are being promoted. Along with this, with respect to the air conditioning system called the direct expansion system, since the amount of the refrigerant used is large, there are various techniques for reducing the amount of the refrigerant. Here, the direct expansion system is a system in which the refrigerant is directly expanded by the indoor unit to obtain cold heat. On the other hand, the replacement with an indirect system that is not a direct expansion system is also progressing.

An air-cooled chiller is a typical indirect air conditioning system. The air-cooled chiller uses a refrigerant to generate cold water, and the cold water is directly supplied to the room through a water pipe, or the air cooled by the cold water is conveyed to the room through a duct to air-condition the room.

In non-residential facilities such as offices, hospitals, and schools, ventilation is as important as air conditioning in the air conditioning system. When ventilating, the equipment and air conditioning system that is introduced into the room after cooling, dehumidifying, heating, or humidifying once, instead of introducing the outside air into the room as it is, is called an external air conditioner. In addition, the air conditioner and air conditioning system for indoor air may be referred to as an internal conditioner.

In the past, both the internal adjustment machine and the external adjustment machine were often composed of a direct expansion system, but due to the promotion of replacement with an indirect system due to the above-mentioned refrigerant amount regulation, the internal adjustment machine is composed of a direct expansion system. However, there are many cases where the external air conditioner is composed of an indirect system.

However, since the internal adjustment machine and the external adjustment machine are controlled independently, the total energy efficiency of the entire system including the internal adjustment machine and the external adjustment machine is not always high. Therefore, the air conditioning system that combines the internal and external adjustment machines is regarded as one system, and the system is pre-modeled and controlled at the optimum operation point so that the energy efficiency of the system is maximized under various conditions. There is a technique to apply (see, for example, Non-Patent Document 1). Further, a technique for saving energy by having a direct expansion type internal adjustment machine process only a sensible heat load has been proposed (see, for example, Patent Document 1).

Japanese Patent Application Laid-Open No. 2003-247741

Toshiba Review Vol. 68 No. 12 (2013) p. 26-29

However, in the technique of Non-Patent Document 1, since it is necessary to model the characteristics of each of the internal and external air conditioners, the preliminary preparation work is complicated, and the air conditioning system having various configurations can be flexibly supported. That is difficult. As a result, sufficient energy saving may not be ensured. Further, in the technique of Patent Document 1, it cannot be said that the energy saving when treating the latent heat load is sufficiently considered, and there is room for improving the energy saving property.

The present invention has been made in view of the above circumstances, and an object of the present invention is to improve the energy saving of an air conditioning system.

In order to achieve the above object, the ventilation system of the present invention takes in a first heat exchanger that exchanges heat between the refrigerant flowing in the refrigerant circuit and the fluid, a pump that sends out the fluid, and the fluid and the outside of the indoor space. Humidity information indicating the measured value of either the humidity in the indoor space or the humidity in the outside, the fluid circuit that circulates the fluid through the second heat exchanger that exchanges heat with the air. When the index value obtained from the first acquisition means for acquiring the above, the ventilation means for blowing the air heat exchanged by the second heat exchanger into the indoor space, and the measured value of the humidity indicated by the humidity information becomes smaller than the reference value, A first control means for controlling the temperature of the air blown into the indoor space by the blower means to raise the temperature from the air temperature when the index value is equal to the reference value, and a setting means for setting a target value of humidity in the indoor space. The index value is the difference between the measured value of the humidity indicated by the humidity information and the target value of the humidity set by the setting means .

According to the present invention, the energy saving property of the air conditioning system can be improved.

The figure which shows the structure of the air-conditioning system which concerns on Embodiment 1 of this invention. The figure which shows the refrigerant circuit of a temperature control system Diagram showing the fluid circuit of a ventilation system The figure which shows the functional configuration of a control unit Flow diagram showing the air conditioning process performed by the controller The figure which shows the relationship between the temperature difference and the refrigerant evaporation temperature. The figure which shows the relationship between the humidity difference and the blowing temperature The figure which shows the structure of the ventilation system which concerns on Embodiment 2 of this invention. The figure which shows the relationship between the measured value of humidity and the blowing temperature which concerns on Embodiment 2. The figure which shows the deformation example of the ventilation system Diagram showing a modified example of a fluid circuit The figure which shows the deformation example of the relation between the humidity difference and the blowing temperature.

Hereinafter, embodiments of the present invention will be described in detail with reference to the drawings.

Embodiment 1.
FIG. 1 shows the configuration of the air conditioning system 100 according to the first embodiment. The air conditioning system 100 is a system that harmonizes the air in the indoor space 102 to be air-conditioned to make the indoor space 102 a comfortable state for the user. The interior space 102 is, for example, a room provided in a building represented by a factory, an office, a hospital, a school, other public facilities, and a house. However, the interior space 102 is not limited to this, and may be a space provided inside a vehicle represented by a vehicle, a ship, or an aircraft, or may be an underground space. Further, the indoor space 102 is not limited to a closed space, and a part of the indoor space 102 may communicate with the outside air.

As shown in FIG. 1, the air conditioning system 100 has a temperature adjusting system 110 that adjusts the temperature of the air in the indoor space 102, and has a ventilation system 120 that ventilates the air in the indoor space 102. In FIG. 1, the direction of the airflow formed by the temperature control system 110 and the ventilation system 120 is schematically shown by a white arrow.

The temperature adjustment system 110 corresponds to a so-called internal regulator, and is a direct expansion system that takes in air from the interior space 102, adjusts the temperature of the air, and then blows air to the interior space 102. The temperature control system 110 mainly processes the sensible heat load among the air conditioning loads processed by the air conditioning system 100. In other words, the temperature adjustment system 110 realizes energy saving by controlling the evaporation temperature of the refrigerant according to the sensible heat load, using the difference between the target temperature value and the measured value as the sensible heat load.

The ventilation system 120 corresponds to a so-called external air conditioner, and takes in air from the outside of the indoor space 102, dehumidifies the air, and then blows the air into the indoor space 102. The ventilation system 120 mainly processes the latent heat load among the air conditioning loads processed by the air conditioning system 100. In other words, the ventilation system 120 easily improves energy saving with a simple configuration by controlling the supply air temperature according to the latent heat load by using the difference between the target value of humidity and the measured value as the latent heat load. The ventilation system 120 according to the present embodiment does not have a configuration for positively exhausting the air in the indoor space 102. The interior space 102 is appropriately exhausted through a doorway, a window, or a ventilation port.

More specifically, the air conditioning system 100 includes an outdoor unit 20 for exchanging heat with the outside air, indoor units 30 and 31 that blow air-conditioned air into the indoor space 102, and a heat source unit 40 that functions as a heat source for the ventilation system 120. It has a ventilation device 50 that dehumidifies the outside air and supplies it to the indoor space 102, a control device 60 that controls the components of the air conditioning system 100, and a temperature / humidity measuring device 61 that measures the temperature / humidity of the indoor space 102. ing.

The outdoor unit 20 and the indoor units 30 and 31 are connected to each other via a refrigerant pipe 20a. The indoor units 30 and 31 are ceiling-embedded air-conditioning devices installed behind the ceiling 101. The heat source machine 40 and the ventilation device 50 are connected to each other via a water pipe 40a. The ventilation device 50 supplies air to the indoor space 102 through the air supply duct 50a arranged in the attic 101. The outdoor unit 20, the heat source unit 40, and the ventilation device 50 are installed outdoors represented by the wall surface or the roof of a building having an indoor space 102 inside.

FIG. 2 shows a refrigerant circuit 71 formed by the outdoor unit 20 and the indoor units 30 and 31.

As shown in FIG. 2, the outdoor unit 20 measures the refrigerant evaporation temperature from the compressor 21 that compresses the refrigerant, the frequency adjusting unit 22 that adjusts the frequency of the compressor, and the temperature of the refrigerant passing through the compressor 21. Evaporation temperature measuring unit 23 for this purpose, a four-way valve 24 that switches the flow path of the refrigerant, an outdoor heat exchanger 25 that exchanges heat between the outside air and the refrigerant, and an outdoor that blows air to the outdoor heat exchanger 25. It has a blower 26 and. The compressor 21, the four-way valve 24, and the outdoor heat exchanger 25 are connected by a refrigerant pipe 20a.

The compressor 21 compresses the refrigerant steam that has flowed from the four-way valve 24 into the suction port via the refrigerant pipe 20a, and discharges the high-temperature and high-pressure refrigerant steam from the discharge port. The refrigerant vapor discharged by the compressor 21 is sent to the four-way valve 24 via the refrigerant pipe 20a. The frequency adjusting unit 22 attached to the compressor 21 adjusts the operating frequency of the compressor 21 to the frequency specified by the control signal according to the control signal transmitted from the control device 60.

The evaporation temperature measuring unit 23 includes a pressure sensor attached to the compressor 21. The evaporation temperature measuring unit 23 measures the pressure of the refrigerant in the suction unit (low pressure part) of the compressor 21, converts the measured value into the saturation temperature (= evaporation temperature) of the refrigerant, and indicates the evaporation temperature. Information is transmitted to the control device 60.

The four-way valve 24 is connected to the suction port and the discharge port of the compressor 21 via the refrigerant pipe 20a. Further, the four-way valve 24 is connected to the outdoor heat exchangers 25 and the indoor heat exchangers 301 and 311 of the indoor units 30 and 31 via the refrigerant pipe 20a. The four-way valve 24 switches the flow path of the refrigerant according to the control signal transmitted from the control device 60. That is, the four-way valve 24 sends the refrigerant delivered from the discharge port of the compressor 21 to the outdoor heat exchanger 25 or the indoor heat exchangers 301 and 311. Further, the four-way valve 24 sends the refrigerant sent from the outdoor heat exchanger 25 or the indoor heat exchangers 301 and 311 to the suction port of the compressor 21. By switching the flow path of the four-way valve 24, either the refrigerant circuit 71 for cooling operation or the refrigerant circuit 71 for heating operation is formed. The details of the refrigerant circuit 71 will be described later.

The outdoor heat exchanger 25 is connected to the four-way valve 24 and the expansion valves 302 and 312 of the indoor units 30 and 31 via the refrigerant pipe 20a, and the refrigerant flowing from one of the four-way valve 24 and the expansion valves 302 and 312 is supplied to the other. Send to. The outdoor heat exchanger 25 condenses or evaporates the inflowing refrigerant by exchanging heat between the outside air and the refrigerant, and discharges the liquefied refrigerant or the refrigerant vapor. For example, during the cooling operation, the outdoor heat exchanger 25 functions as a condenser to dissipate heat from the refrigerant. Further, during the heating operation, the outdoor heat exchanger 25 functions as an evaporator, so that the refrigerant absorbs heat.

The outdoor blower 26 includes a fan and an electric motor for rotating the fan, and is arranged in the vicinity of the outdoor heat exchanger 25. The outdoor blower 26 rotates a fan according to a control signal transmitted from the control device 60 to generate an air flow that flows in from the outside of the outdoor unit 20 and passes through the outdoor heat exchanger 25. The air heat exchanged by the outdoor heat exchanger 25 is heated or cooled and discharged to the outside of the outdoor unit 20. The air volume of the outdoor blower 26 is designated by a control signal from the control device 60.

The indoor unit 30 uses the indoor heat exchanger 301 for heat exchange between the air in the indoor space 102 and the refrigerant, the expansion valve 302 having a variable opening degree, and the air heat exchanged by the indoor heat exchanger 301 in the indoor space. It has an indoor blower 303 that blows air to 102, and a temperature measuring unit 304 that measures the temperature of air in the indoor space 102. The indoor heat exchanger 301 and the expansion valve 302 are connected by a refrigerant pipe 20a.

The indoor heat exchanger 301 is connected to the four-way valve 24 and the expansion valve 302 of the outdoor unit via the refrigerant pipe 20a, and sends out the refrigerant flowing from one of the four-way valve 24 and the expansion valve 302 to the other. The indoor heat exchanger 301 evaporates or condenses the inflowing refrigerant by exchanging heat between the air in the indoor space 102 and the refrigerant, and discharges the refrigerant vapor, the liquefied refrigerant, or the two-phase refrigerant. The two-phase refrigerant means a refrigerant in which a refrigerant vapor and a liquefied refrigerant are mixed. For example, during the cooling operation, the indoor heat exchanger 301 functions as an evaporator, so that the refrigerant absorbs heat and the air in the indoor space 102 is cooled. Further, during the heating operation, the indoor heat exchanger 301 functions as a condenser to dissipate heat from the refrigerant, and the air in the indoor space 102 is heated.

The expansion valve 302 is a decompressor whose opening degree can be continuously changed by a built-in pulse motor. The expansion valve 302 is connected to the outdoor heat exchanger 25 and the indoor heat exchanger 301 of the outdoor unit 20 via the refrigerant pipe 20a, and the refrigerant flowing from one of the outdoor heat exchanger 25 and the indoor heat exchanger 301 is sent to the other. Send out. The expansion valve 302 reduces the pressure applied to the inflowing refrigerant to expand the refrigerant, and discharges the low-temperature low-pressure refrigerant from the inflowing refrigerant. The temperature and pressure of the refrigerant discharged from the expansion valve 302 change according to the opening degree of the expansion valve 302. The opening degree of the expansion valve 302 is specified by a control signal transmitted from the control device 60.

The indoor blower 303 has the same configuration as the outdoor blower 26, and is arranged in the vicinity of the indoor heat exchanger 301. However, the fan of the indoor blower 303 is, for example, a cross flow fan or a propeller fan. The indoor blower 303 rotates the fan according to the control signal transmitted from the control device 60 to generate an air flow that flows from the indoor space 102 into the indoor unit 30 and passes through the indoor heat exchanger 301. The air heat exchanged by the indoor heat exchanger 301 is cooled or heated and blown to the indoor space 102 from the outlet of the indoor unit 30. The wind direction and air volume of the indoor blower 303 are specified by a control signal from the control device 60.

The temperature measuring unit 304 is arranged near the air suction port of the indoor unit 30. The temperature measuring unit 304 measures the temperature of the air sucked into the indoor unit 30 as the temperature of the air in the indoor space 102, and transmits the temperature information indicating the measured value to the control device 60.

The indoor unit 31 has the same configuration as the indoor unit 30. Specifically, the indoor unit 31 includes an indoor heat exchanger 301, an expansion valve 302, an indoor blower 303, an indoor heat exchanger 311 equivalent to the temperature measuring unit 304, an expansion valve 312, an indoor blower 313, and temperature measurement of the indoor unit 30. It has a part 314.

As shown in FIG. 2, the refrigerant circuit 71 when the cooling operation is executed by the outdoor unit 20 and the indoor units 30 and 31 having the above configuration includes the compressor 21, the four-way valve 24, and the outdoor heat exchanger 25. The refrigerant is circulated through the expansion valves 302, 312, the indoor heat exchangers 301, 311 and the four-way valve 24 in this order. In FIG. 2, the direction in which the refrigerant flows in the refrigerant circuit 71 is indicated by a broken line arrow. Further, the refrigerant circuit 71 when the heating operation is executed passes the compressor 21, the four-way valve 24, the indoor heat exchangers 301, 311, the expansion valves 302, 312, the outdoor heat exchanger 25, and the four-way valve 24 in this order. To circulate the refrigerant. In FIG. 2, the direction in which the refrigerant flows in the refrigerant circuit 71 is indicated by a solid arrow. The refrigerant circuit 71 corresponds to, but is not limited to, the refrigerant circuit according to the claim.

FIG. 3 shows a fluid circuit 72 formed by the heat source machine 40 and the ventilation device 50.

The heat source machine 40 constitutes a so-called air-cooled chiller together with the ventilation device 50. As shown in FIG. 3, the heat source machine 40 includes a compressor 41 that compresses the refrigerant, a four-way valve 42 that switches the flow path of the refrigerant, a heat exchanger 43 that exchanges heat between the outside air and the refrigerant, and the heat exchanger 43. It has an expansion valve 44 that expands the refrigerant, a heat exchanger 45 that exchanges heat between the refrigerant and the fluid, and a blower 46 that blows air to the heat exchanger 43. The compressor 41, the four-way valve 42, the heat exchangers 43, 45 and the expansion valve 44 are connected by a refrigerant pipe 47.

The compressor 41 is, for example, a scroll compressor, a rotary compressor, or other device that compresses the refrigerant by a method. The compressor 41 compresses the refrigerant steam that has flowed from the four-way valve 42 into the suction port through the refrigerant pipe 47, and discharges the high-temperature and high-pressure refrigerant steam from the discharge port. The refrigerant vapor discharged by the compressor 41 is sent to the four-way valve 42 via the refrigerant pipe 47.

The four-way valve 42 is connected to the suction port and the discharge port of the compressor 41 via the refrigerant pipe 47. Further, the four-way valve 42 is connected to the heat exchanger 43 and the heat exchanger 45 via the refrigerant pipe 47. The four-way valve 42 sends the refrigerant sent from the discharge port of the compressor 41 to the heat exchanger 43, and sends the refrigerant sent from the heat exchanger 45 to the suction port of the compressor 41.

The heat exchanger 43 is connected to the four-way valve 42 and the expansion valve 44 via the refrigerant pipe 47, and sends the refrigerant flowing in from the four-way valve 42 to the expansion valve 44. The heat exchanger 43 condenses the inflowing refrigerant by exchanging heat between the outside air and the high-temperature refrigerant, and discharges the liquefied refrigerant. That is, the heat exchanger 43 functions as a condenser to dissipate heat from the refrigerant.

The expansion valve 44 is a decompressor having a fixed opening degree. The expansion valve 44 is connected to the heat exchanger 43 and the heat exchanger 45 via the refrigerant pipe 47, and sends the refrigerant flowing in from the heat exchanger 43 to the heat exchanger 45. The expansion valve 44 reduces the pressure applied to the inflowing refrigerant to expand the refrigerant, and discharges the low-temperature low-pressure refrigerant from the inflowing refrigerant.

The heat exchanger 45 cools water by exchanging heat between the refrigerant flowing to the primary side and water as a fluid flowing to the secondary side. The primary side inlet of the heat exchanger 45 is connected to the expansion valve 44 via the refrigerant pipe 47, and the primary side outlet is connected to the four-way valve 42 via the refrigerant pipe 47. The secondary side inlet of the heat exchanger 45 is connected to the heat exchanger 51 via the water pipe 40a, and the secondary side outlet is connected to the suction port of the pump 73 via the water pipe 40a. The heat exchanger 45 functions as an evaporator that evaporates the refrigerant that has flowed in from the expansion valve 44.

The blower 46 has the same configuration as the outdoor blower 26, and is arranged in the vicinity of the heat exchanger 43. The blower 46 rotates the fan to generate an air flow that flows in from the outside of the heat source machine 40 and passes through the heat exchanger 43. The air heat exchanged by the heat exchanger 43 is heated and discharged to the outside of the heat source machine 40.

As shown in FIG. 3, the refrigerant circuit 74 formed by the heat source machine 40 having the above configuration includes the compressor 41, the four-way valve 42, the heat exchanger 43, the expansion valve 44, the heat exchanger 45, and the four-way valve 42. In this order, the refrigerant is circulated. In FIG. 3, the direction in which the refrigerant flows in the refrigerant circuit 74 is indicated by a broken line arrow.

The ventilation device 50 corresponds to a so-called air handling unit (AHU, Air Handling Unit). The ventilation device 50 measures the absolute humidity of the outside air, the heat exchanger 51 that exchanges heat between the fluid and the air taken in from the outside of the indoor space 102, the blower 52 that blows the air to the heat exchanger 51, and the outside air. It has a humidity measuring instrument 53 and a temperature measuring instrument 54 that measures the temperature of air that passes through the heat exchanger 51 and is supplied to the indoor space 102.

The heat exchanger 51 is connected to the discharge port of the pump 73 and the heat exchanger 45 of the heat source machine 40 via the water pipe 40a, and sends the water flowing in from the discharge port of the pump 73 to the heat exchanger 45. The heat exchanger 51 cools the air to a temperature below the stall temperature and dehumidifies it by exchanging heat between water as a fluid and air.

The blower 52 has the same configuration as the outdoor blower 26, and is arranged in the air passage through the heat exchanger 51. However, the fan of the blower 52 is, for example, a sirocco fan or a propeller fan. The blower 52 rotates the fan according to the control signal transmitted from the control device 60 to generate an air flow that flows from the outside to the inside of the ventilation device 50 and passes through the heat exchanger 51. The air heat-exchanged by the heat exchanger 51 is dehumidified and blown through the air supply duct 50a from the air supply port to the indoor space 102. The air volume of the blower 52 is designated by a control signal from the control device 60. The blower 52 corresponds to, but is not limited to, the blower means according to the claim.

The humidity measuring instrument 53 is a humidity sensor arranged on the upstream side of the heat exchanger 51 in the air passage formed inside the ventilation device 50. The humidity measuring instrument 53 transmits humidity information indicating the measured value of humidity to the control device 60. The temperature measuring instrument 54 is a temperature sensor arranged on the downstream side of the heat exchanger 51 in the air passage of the ventilation device 50. The temperature measuring instrument 54 may be arranged in the air supply duct 50a or may be arranged in the vicinity of the air supply port. The temperature measuring instrument 54 transmits temperature information indicating the measured value of the temperature to the control device 60.

The suction port of the pump 73 is connected to the heat exchanger 45 of the heat source machine 40 via the water pipe 40a, and the discharge port is connected to the heat exchanger 51 of the ventilation device 50 via the water pipe 40a. The pump 73 operates at a rotation speed according to a control signal from the control device 60 to deliver water, thereby generating a water flow flowing through the fluid circuit 72.

As shown in FIG. 3, the fluid circuit 72 formed by the heat source machine 40, the ventilation device 50, and the pump 73 having the above configuration passes water through the pump 73, the heat exchanger 51, and the heat exchanger 45 in this order. To circulate. In FIG. 3, the direction in which water as a fluid flows in the fluid circuit 72 is indicated by a solid arrow. The fluid circuit 72 corresponds to, but is not limited to, the fluid circuit of the claim.

Returning to FIG. 1, the control device 60 is connected to the outdoor unit 20 and the heat source unit 40 via the signal line 60a. Further, the control device 60 is connected to the temperature / humidity measuring instrument 61 via the signal line 60a. Then, the control device 60 controls the outdoor unit 20 and the indoor units 30 and 31 based on the measured value of the temperature and humidity acquired from the temperature and humidity measuring instrument 61 and the temperature information and the humidity information acquired from other measuring instruments. , Controls the heat source machine 40 and the ventilation device 50. Although omitted in FIG. 1, the outdoor unit 20 and the indoor units 30 and 31 are connected via a signal line, and the control device 60 controls the indoor units 30 and 31 via the outdoor unit 20. .. Further, the heat source machine 40 and the ventilation device 50 are connected via a signal line, and the control device 60 controls the ventilation device 50 via the heat source machine 40.

FIG. 4 shows the functional configuration of the control device 60. As shown in FIG. 4, the control device 60 includes a humidity setting unit 62 that sets a target value of humidity in the indoor space 102, and a humidity information acquisition unit that acquires humidity information from the temperature / humidity measuring device 61 and the humidity measuring device 53. 63, a ventilation system control unit 64 that controls the heat source machine 40 and the ventilation device 50, a temperature setting unit 65 that sets a target value of the indoor space 102, a temperature / humidity measuring device 61, a temperature measuring device 54, and a temperature measuring unit 304. , 314 has a temperature information acquisition unit 66 that acquires temperature information and evaporation temperature information, and a temperature control system control unit 67 that controls the outdoor unit 20 and the indoor units 30 and 31. Note that FIG. 4 shows a simplified configuration of the outdoor unit 20, the indoor unit 30, the heat source unit 40, and the ventilation device 50.

The humidity setting unit 62 and the temperature setting unit 65 mainly set a user interface having an input interface represented by an input key and an output interface represented by an LCD (Liquid Crystal Display), and set target values. It is realized by a storage device that stores. The user interface may be a touch screen in which an input interface and an output interface are integrally formed. Further, the humidity setting unit 62 and the temperature setting unit 65 are realized by a communication interface circuit for communicating with a terminal operated by the user, and the user may set a target value of temperature and humidity using the terminal. The humidity setting unit 62 corresponds to the setting means according to the claim, but is not limited to the humidity setting unit 62.

The humidity information acquisition unit 63 and the temperature information acquisition unit 66 are mainly realized by a communication interface circuit. The humidity information acquisition unit 63 corresponds to the first acquisition means according to the claim, but is not limited to the humidity information acquisition unit 63. Further, the temperature information acquisition unit 66 corresponds to the second acquisition means of the claim, although not limited to the temperature information acquisition unit 66.

The ventilation system control unit 64 and the temperature control system control unit 67 are mainly realized by a microprocessor, RAM (Random Access Memory) and EEPROM (Electrically Erasable Programmable Read-Only Memory). When the microprocessor executes the program P1 stored in the EEPROM, the ventilation system control unit 64 controls the heat source unit 40 and the ventilation device 50, and the temperature control system control unit 67 controls the outdoor unit 20 and the indoor units 30, 31. To control. The ventilation system control unit 64 corresponds to, but is not limited to, the first control means according to the claim. Further, the temperature control system control unit 67 corresponds to the second control means according to the claim, but is not limited to the temperature control system control unit 67.

In FIG. 4, as the components of the control device 60, the humidity setting unit 62, the humidity information acquisition unit 63 and the ventilation system control unit 64 mainly related to the ventilation system 120, and the temperature setting unit 65 mainly related to the temperature adjustment system 110 and the temperature information are shown. The acquisition unit 66 and the temperature control system control unit 67 are separated, but the present invention is not limited to this. For example, the control device 60 may have a setting unit for setting the temperature and humidity, an acquisition unit for acquiring information on the temperature and humidity, and a control unit for controlling other devices.

Further, both the temperature control system 110 and the ventilation system 120 include all the components of the control device 60, but the ventilation system 120 includes only the humidity setting unit 62, the humidity information acquisition unit 63, and the ventilation system control unit 64. The temperature adjusting system 110 may include only the temperature setting unit 65, the temperature information acquisition unit 66, and the temperature control system control unit 67.

Subsequently, an example in which the air conditioning system 100 performs a cooling operation will be described with reference to FIG. 5 regarding the air conditioning process executed by the air conditioning system 100. The air conditioning process is repeatedly executed at regular intervals, mainly by the control device 60. This cycle is, for example, 1 minute, 15 minutes, or 1 hour.

In the air conditioning process, the control device 60 acquires the target value of the temperature (step S1). Specifically, the temperature control system control unit 67 reads data indicating the set temperature of the indoor space 102 set by the temperature setting unit 65 and stored in the storage device.

Next, the control device 60 acquires the measured value of the temperature (step S2). Specifically, the temperature information acquisition unit 66 acquires temperature information indicating the temperature of the current indoor space 102. This temperature information may be any information transmitted from the temperature / humidity measuring instrument 61 and the temperature measuring units 304 and 314.

Next, the control device 60 calculates an index value regarding the current sensible heat load (step S3). Specifically, the temperature control system control unit 67 calculates the difference between the target value Tset acquired in step S1 and the measured value Troom acquired in step S2 as an index value indicating the sensible heat load. .. More specifically, the temperature control system control unit 67 calculates the difference ΔT (= Troom-Tset) obtained by subtracting the target value Tset from the measured value Troom.

Next, the control device 60 controls the refrigerant evaporation temperature (step S4). Specifically, the temperature control system control unit 67 controls the opening degree of the expansion valves 302 and 312 and the frequency of the compressor 21 according to the sensible heat load calculated in step S3, thereby controlling the indoor heat exchanger 301. , 311 controls the refrigerant evaporation temperature. FIG. 6 schematically shows the refrigerant evaporation temperature controlled according to the sensible heat load. As shown in FIG. 6, when the temperature difference ΔT corresponding to the sensible heat load is equal to zero, the refrigerant evaporation temperature is set to ET1, and when the temperature difference ΔT becomes large and becomes T1, the refrigerant evaporation temperature is set to ET2 lower than ET1. .. That is, the larger the load, the lower the evaporation temperature. When the temperature difference ΔT exceeds T1, the refrigerant evaporation temperature is fixed to ET2. The refrigerant evaporation temperature ET2 is equal to the lower limit of the evaporation temperature range defined by the configuration of the refrigerant circuit 71 or the lower limit of the predetermined evaporation temperature range.

Normally, the internal conditioner often operates at a constant refrigerant evaporation temperature. On the other hand, in the present embodiment, the refrigerant evaporation temperature is adjusted according to the temperature difference ΔT, and when the sensible heat load is small, the refrigerant evaporation temperature is increased. The higher the refrigerant evaporation temperature, the higher the COP (Coefficient Of Performance) of the refrigeration cycle. Therefore, the temperature adjustment system 110 saves energy consumption when the load is small and realizes energy saving.

Returning to FIG. 5, following step S4, the control device 60 acquires the target value of humidity (step S5). Specifically, the ventilation system control unit 64 reads data indicating the set value of the absolute humidity of the indoor space 102 set by the humidity setting unit 62 and stored in the storage device.

Next, the control device 60 acquires the measured value of humidity (step S6). Specifically, the humidity information acquisition unit 63 acquires either the humidity information indicating the measured value of the absolute humidity in the current outside air or the humidity information indicating the measured value of the absolute humidity in the current indoor space 102. do.

Next, the control device 60 calculates an index value regarding the current latent heat load (step S7). Specifically, the ventilation system control unit 64 calculates the difference between the target value Xset acquired in step S5 and the measured value Xa acquired in step S6 as an index value indicating the latent heat load. More specifically, the ventilation system control unit 64 calculates the difference ΔX (= Xa-Xset) obtained by subtracting the target value Xset from the measured value Xa.

Next, the control device 60 controls the blowing temperature of the ventilation device 50 (step S8). Specifically, the ventilation system control unit 64 controls at least one of the rotation speed of the pump 73 and the rotation speed of the blower 52 according to the latent heat load calculated in step S7, whereby the indoor space from the ventilation device 50 The temperature of the air supplied to 102 is controlled. FIG. 7 schematically shows the blowout temperature controlled according to the latent heat load.

As shown in FIG. 7, when the humidity difference ΔX corresponding to the latent heat load is equal to zero, the blowing temperature is set to SAT1, and when the humidity difference ΔX becomes large and becomes X1, the blowing temperature is set to SAT2 lower than SAT1. That is, as the load increases, the blowing temperature is lowered and the dehumidifying capacity is increased. Further, when the humidity difference ΔX exceeds X1, the blowing temperature is fixed to SAT2. The blowout temperature SAT2 is equal to the lower limit of the blowout temperature defined by the configuration of the fluid circuit 72 and the refrigerant circuit 74, or the lower limit of the blowout temperature range defined in advance.

Normally, the external conditioner often operates while maintaining a certain dehumidifying capacity. On the other hand, in the present embodiment, the blowing temperature is adjusted according to the humidity difference ΔX, and when the humidity difference ΔX becomes smaller than the reference value X, the blowing temperature is set to the blowing temperature when the humidity difference ΔX is equal to X1. Raise more than. Therefore, when the latent heat load is small, the blowing temperature is raised to reduce the dehumidifying capacity. As the blowing temperature becomes higher, the water temperature returning to the heat exchanger 45 constituting the heat source machine 40 as an air-cooled chiller becomes lower, and the evaporation temperature of the refrigerant circuit 74 included in the heat source machine 40 rises, resulting in a higher COP. The ventilation system 120 saves energy when the load is small and improves energy saving.

However, the range defined by SAT1 and SAT2 shown in FIG. 7 is defined as a range below the dew point temperature of the taken-in air.

Returning to FIG. 5, when step S8 is completed, the control device 60 ends the air conditioning process.

As described above, the temperature control system 110 according to the present embodiment changes the refrigerant evaporation temperature according to the temperature difference corresponding to the sensible heat load, and the ventilation system 120 has the humidity difference corresponding to the latent heat load. The blowing temperature is changed accordingly. The temperature difference and the humidity difference can be easily obtained from the output values of the sensors possessed by the temperature control system 110 and the ventilation system 120, respectively. Therefore, complicated advance preparation is not required. Further, the temperature control system 110 and the ventilation system 120 each autonomously determine the operating state and individually perform energy-saving operation, and as a result, the energy saving of the entire air conditioning system 100 is achieved. As a result, it is possible to easily construct an air conditioning system 100 that exhibits an energy saving effect.

Embodiment 2.
Subsequently, the second embodiment will be described focusing on the differences from the first embodiment described above. For the same or equivalent configuration as that of the first embodiment, the same reference numerals are used, and the description thereof will be omitted or simplified. As shown in FIG. 8, the present embodiment is different from the first embodiment in that the ventilation device 50 includes an exhaust air passage for exhausting the air in the interior space 102 to the outside in addition to the air supply air passage. ..

As shown in FIG. 8, the ventilation device 50 according to the present embodiment includes a blower 55 for exhausting air into the exhaust air passage, a humidity measuring device 56 for measuring the humidity of air passing through the exhaust air passage, and the like. have. The humidity measuring instrument 56 transmits humidity information indicating the measured value of the absolute humidity to the control device 60.

The control device 60 according to the present embodiment receives humidity information indicating the measured value of the humidity of the indoor space 102 from the temperature / humidity measuring instrument 61 and the humidity measuring instrument 56. Further, the control device 60 receives humidity information indicating the measured value of the humidity of the outside air from the humidity measuring instrument 53. Then, the control device 60 executes a process equivalent to the air conditioning process shown in FIG.

However, in step S7, the control device 60 adopts either the measured value of the humidity in the indoor space 102 or the measured value of the humidity in the outside air as an index value. For example, the absolute humidity Xroom of the interior space 102 is used to determine the outlet temperature as shown in FIG.

Specifically, as shown in FIG. 9, when the measured value Xroom of the humidity in the indoor space is equal to the target value X2, the blowing temperature is set to SAT3, and when the difference between the measured values Xroom and X2 becomes large, the blowing is blown. The temperature is lower than SAT3. Then, when the measured value Xroom becomes equal to X3, the blowing temperature is set to SAT4, which is lower than SAT3. That is, as the load increases, the blowing temperature is lowered and the dehumidifying capacity is increased. Further, when the measured value Xroom exceeds X3, the blowing temperature is fixed to SAT4. The blowout temperature SAT 4 is equal to the lower limit of the blowout temperature defined by the configuration of the fluid circuit 72 and the refrigerant circuit 74, or the lower limit of the blowout temperature range defined in advance.

As described above, in the ventilation device 50 according to the present embodiment, the blowing temperature is determined by using the measured value of the humidity of the indoor space 102 as an index value. Thereby, the same effect as that of the first embodiment can be obtained.

Although the embodiments of the present invention have been described above, the present invention is not limited to the above embodiments.

For example, the ventilation device 50 is not limited to the air handling unit according to the above embodiment. For example, it may be a ceiling-embedded device as shown in FIG.

Further, as shown in FIG. 11, a bypass path may be formed in the fluid circuit 72 by the three-way valve 75.

Further, the relationship between the humidity difference ΔX and the blowing temperature is not limited to that illustrated in FIG. For example, as shown in FIG. 12, the blowing temperature may be increased when the humidity difference ΔX becomes smaller than the reference value X1.

Further, the heat source machine 40 is not limited to the air-cooled chiller, and may be a water-cooled chiller. The number of indoor units is not limited to two, and may be one or three or more. Although one room is shown as an example of the interior space 102, a plurality of rooms may be collectively treated as the interior space 102.

Further, the adjustment of the blowing temperature using the index value is not limited to the above. For example, it is conceivable to determine the blowing temperature of the ventilation system 120 from the first index value which is the outside air humidity, and feed back the indoor humidity which is the second index value to correct the blowing temperature. Here, when correcting the blowing temperature, the blowing temperature may be lowered when the indoor humidity does not reach the target value Xset, and the blowing temperature may be raised when the indoor humidity becomes less than the target value Xset.

The function of the control device 60 according to the above-described embodiment can be realized by dedicated hardware or by a normal computer system.

For example, the program P1 is stored and distributed in a computer-readable recording medium such as a flexible disk, a CD-ROM (Compact Disk Read-Only Memory), a DVD (Digital Versatile Disk), or an MO (Magneto-Optical disk). By installing the program P1 on a computer, it is possible to configure a device that executes the above-mentioned processing.

Further, the program P1 may be stored in a disk device or the like of a predetermined server device on a communication network such as the Internet, superimposed on a carrier wave, and downloaded to a computer, for example.

Further, the above-mentioned processing can also be achieved by starting and executing the program P1 while transferring it via a network such as the Internet.

Further, the above-mentioned processing can also be achieved by executing the program P1 in whole or in part on the server device and executing the program P1 while the computer sends and receives information about the processing via the communication network. ..

If the above-mentioned functions are shared by the OS (Operating System) or realized by collaboration between the OS and the application, only the parts other than the OS may be stored and distributed in the medium. You can also download it to your computer.

Further, the means for realizing the function of the air conditioning system 100 is not limited to software, and a part or all thereof may be realized by dedicated hardware (circuit or the like). For example, if the functional components of the control device 60 are configured by using an FPGA (Field Programmable Gate Array), an ASIC (Application Specific Integrated Circuit), or the like, the power saving of the control device 60 can be achieved.

The present invention allows for various embodiments and modifications without departing from the broad spirit and scope. Further, the above-described embodiments are for explaining the present invention, and do not limit the scope of the present invention. That is, the scope of the present invention is shown not by the embodiment but by the claims. And various modifications made within the scope of the claims and within the equivalent meaning of the invention are considered to be within the scope of the present invention.

The present invention is suitable for air conditioning of indoor spaces.

100 Air conditioning system, 101 Ceiling, 102 Indoor space, 110 Temperature control system, 120 Ventilation system, 20 Outdoor unit, 20a Refrigerator piping, 21 Compressor, 22 Frequency control unit, 23 Evaporation temperature measurement unit, 24 Four-way valve, 25 Outdoor unit Heat exchanger, 26 outdoor blower, 30, 31 indoor unit, 301, 311 indoor heat exchanger, 302, 312 expansion valve, 303, 313 indoor blower, 304, 314 temperature measuring unit, 40 heat source machine, 40a water pipe, 41 Compressor, 42 four-way valve, 43 heat exchanger, 44 expansion valve, 45 heat exchanger, 46 blower, 47 refrigerant pipe, 50 ventilator, 50a air supply duct, 51 heat exchanger, 52 blower, 53 humidity measuring instrument, 54 Temperature measuring instrument, 55 Blower, 56 Humidity measuring instrument, 60 Control device, 60a signal line, 61 Temperature and humidity measuring instrument, 62 Humidity setting unit, 63 Humidity information acquisition unit, 64 Ventilation system control unit, 65 Temperature setting unit, 66 Temperature information acquisition unit, 67 temperature control system control unit, 71,74 refrigerant circuit, 72 fluid circuit, 73 pump, 75 three-way valve, P1 program.

Claims (5)

A first heat exchanger that exchanges heat between the refrigerant flowing in the refrigerant circuit and the fluid, a pump that sends out the fluid, and a second heat exchange between the fluid and the air taken in from the outside of the indoor space. A fluid circuit that circulates the fluid through the heat exchanger,
A first acquisition means for acquiring humidity information indicating a measured value of one of the humidity in the indoor space and the humidity in the outside.
A ventilation means for blowing the air exchanged by the second heat exchanger into the interior space,
When the index value obtained from the measured value of humidity indicated by the humidity information becomes smaller than the reference value, the temperature of the air blown into the room space by the ventilation means is controlled, and the index value is equal to the reference value. The first control means for raising the temperature of the air at that time, and
A setting means for setting a target value of humidity in the indoor space, and
Equipped with
The index value is a difference between the measured value of humidity indicated by the humidity information and the target value of humidity set by the setting means, that is, a ventilation system. The first control means controls the temperature of the air by controlling at least one of the air volume of the blower means and the rotation speed of the pump.
The ventilation system according to claim 1 . Refrigerant circuits that circulate refrigerant through compressors, outdoor heat exchangers, expansion valves and indoor heat exchangers,
A second acquisition means for acquiring temperature information indicating a measured value of temperature in the indoor space, and
A second control means for controlling the refrigerant evaporation temperature of the indoor heat exchanger according to an index value obtained from the measured value of the temperature indicated by the temperature information.
With a temperature control system,
The ventilation system according to claim 1 or 2 , which supplies air to the interior space.
Air conditioning system with. A first heat exchanger that exchanges heat between the refrigerant flowing in the refrigerant circuit and the fluid, a pump that sends out the fluid, and a second heat exchange between the fluid and the air taken in from the outside of the indoor space. Of the fluid circuit that connects the heat exchanger and circulates the fluid, the blower step that blows the air that has been heat exchanged by the second heat exchanger into the room space.
When the index value obtained from the measured value of either the humidity in the indoor space or the humidity in the outside becomes smaller than the reference value, the temperature of the air blown into the indoor space is controlled, and the index value becomes the index value. A control step to raise the temperature of the air when it is equal to the reference value, and
The step of setting the target value of humidity in the indoor space and
Including
The index value is the difference between the measured value and the set humidity target value, which is a ventilation method. On the computer
A first heat exchanger that exchanges heat between the refrigerant flowing in the refrigerant circuit and the fluid, a pump that sends out the fluid, and a second heat exchange between the fluid and the air taken in from the outside of the indoor space. Of the fluid circuit that connects to the heat exchanger and circulates the fluid, the air that has been heat-exchanged by the second heat exchanger is blown into the indoor space by a blowing means.
When the index value obtained from the measured value of either the humidity in the indoor space or the humidity in the outside becomes smaller than the reference value, the temperature of the air blown into the indoor space is controlled, and the index value becomes the index value. Raise from the temperature of the air when it is equal to the reference value ,
Setting the target value of humidity in the indoor space,
Let it do that
The index value is the difference between the measured value and the set humidity target value, a program.

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