Cold / hot water type latent sensible separation air conditioning system

Abstract

To provide a high efficiency air conditioning system that uses both of the air-cooling type chiller and water-cooling type chiller.SOLUTION: A cold / hot water type latent sensible separation air conditioning system includes: a cold / hot water type air conditioner (1) for supplying air-conditioning air of which heat is exchanged with heat source water into a space to be air-conditioned; and a heat source device (3) for regulating temperature of the heat source water. The heat source device (3) includes an air-cooling type chiller and a water-cooling type chiller. The air conditioning system includes: a first air-conditioning group (A) constituted of a cold / hot water type air conditioner (1) that uses heat source water of the air-cooling type chiller; and a second air-conditioning group (B) constituted of a cold / hot water type air conditioner (1) that uses heat source water of the water-cooling type chiller.SELECTED DRAWING: Figure 2

Description

Technical Field

[0001] The present invention relates to a chilled and hot water type submerged and separated air conditioning system.

Background Art

[0002] Conventionally, in a chilled and hot water type air conditioning system, a central type in which heat source water is sent from an air-cooled chiller to an air conditioner for air conditioning has been common. This air conditioning system includes a two-pipe type that switches between cold water and hot water, which are heat source waters, for heating and cooling, and a four-pipe type that simultaneously sends cold water and hot water to enable simultaneous heating and cooling operation.

Prior Art Documents

Patent Documents

[0003]

Patent Document 1

Summary of the Invention

Problems to be Solved by the Invention

[0004] With only an air-cooled chiller, due to the air heat source, the energy conversion efficiency is poor, and there is a concern that it may induce the heat island phenomenon with the exhaust heat in summer or cause uneven air conditioning due to defrosting in winter. In addition, in an air conditioning area where a mixture of cooling operation and heating operation is required, the two-pipe type cannot cope, resulting in poor comfort, and if the four-pipe type is used, there is a problem that the equipment and operation costs become excessive.

Means for Solving the Problems

[0005] In order to solve the above problems, the present invention provides a chilled water type air conditioner that exchanges heat between heat source water and air for air conditioning and supplies the air for air conditioning to the conditioned space, a heat source device that adjusts the temperature of the heat source water, and a heat source water circuit that circulates the heat source water between the chilled water type air conditioner and the heat source device. The heat source device includes an air-cooled chiller that adjusts the temperature of the heat source water using an air source heat pump for a chiller, and a water-cooled chiller that adjusts the temperature of the heat source water using a water source heat pump for a chiller. The present invention mainly features that it includes a first air conditioning group composed of the chilled water type air conditioner that exchanges heat between the heat source water of the air-cooled chiller and the air for air conditioning to condition the conditioned space, and a second air conditioning group composed of the chilled water type air conditioner that exchanges heat between the heat source water of the water-cooled chiller and the air for air conditioning to condition the conditioned space.

Effects of the Invention

[0006] According to the invention of claim 1, by setting the installation ratio of the first air conditioning group of the air-cooled chiller and the second air conditioning group of the water-cooled chiller according to external air conditions such as regional temperature differences and heat utilization such as groundwater, the energy conversion efficiency of the heat source can be increased, and the exhaust heat problem and uneven air conditioning can be suppressed. According to the invention of claim 2, in the low-rise area, building drainage or the like can be collected by its own weight without using a pump as the heat source water of the water-cooled chiller and utilized as a heat source, which can save energy. According to the inventions of claims 3 and 4, in the case of a low air conditioning load such as in the intermediate period, the heat source device can be stopped and the cooling and heating free operation can be performed only by the air-cooled outdoor unit, improving energy saving and comfort. The four-pipe system is not required, and the equipment and operation costs can be reduced. Since the heat of the return air is utilized by the air source heat pump to exchange heat with the outside air and introduce the outside air, further energy saving can be achieved.

Brief Description of the Drawings

[0007]

Figure 1

Figure 2

Figure 3

Figure 4

Figure 5

Figure 6

Embodiments for Carrying Out the Invention

Examples

[0008] FIG. 1 and FIG. 2 are an embodiment of a chilled water type latent heat separation air conditioning system of the present invention. This latent heat separation air conditioning system includes a first air-conditioning group A and a second air-conditioning group B. The first air-conditioning group A is installed in the upper area or the middle area of a building such as a building, and the second air-conditioning group B is installed in the lower area of the building.

[0009] The first air-conditioning group A and the second air-conditioning group B include a chilled water type air conditioner 1, an air-cooled outdoor unit 2, a heat source device 3, a heat source water circuit 4, and a control device 5. These chilled water type air conditioners 1, air-cooled outdoor units 2 are connected by a duct 6 (schematically shown by a thick line) so that air for air conditioning (outdoor air, return air, supply air, exhaust air) flows into air-conditioned spaces such as outdoors and indoors.

[0010] As shown in FIGS. 3 and 4, the heat source device 3 includes an air-cooled chiller 12 that cools or heats the heat source water with an air source heat pump 11 for a chiller to adjust the temperature, and a water-cooled chiller 22 that cools or heats the heat source water with a water source heat pump 21 for a chiller to adjust the temperature.

[0011] The first air-conditioning group A is composed of a chilled water type air conditioner 1 that air-conditions the air-conditioned space by heat-exchanging the air for air conditioning with the heat source water of the air-cooled chiller 12, and the second air-conditioning group B is composed of a chilled water type air conditioner 1 that air-conditions the air-conditioned space by heat-exchanging the air for air conditioning with the heat source water of the water-cooled chiller 22.

[0012] The air-cooled chiller 12 includes a chiller air-source heat pump 11 that exchanges heat of the circulating refrigerant with the outside air, a radiation fan 14 that passes the outside air (heat source air) through the heat-source air heat exchanger 13 of the air-source heat pump 11 for heat exchange, and a casing 15 that houses these components.

[0013] The air-source heat pump 11 is composed of a heat-source air heat exchanger 13, a heat-source water heat exchanger 16, a compressor 17, an expansion valve 18, a four-way valve 19, and a refrigerant piping circuit 20. It repeatedly performs the processes of compression, condensation, expansion, and evaporation in sequence on the circulating refrigerant, and absorbs heat in the refrigerant evaporation process and releases heat in the refrigerant condensation process for the air and heat-source water that exchange heat with this refrigerant respectively.

[0014] The heat-source air heat exchanger 13 includes a heat transfer tube group inserted into a plate fin group (not shown), and exchanges heat between the air and the refrigerant flowing through the heat transfer tube group through these. The heat-source water heat exchanger 16 includes a heat transfer plate that separates the heat-source water flowing inside from the refrigerant (not shown), and exchanges heat between the heat-source water and the refrigerant through this heat transfer plate. The air-cooled chiller 12 is installed on the rooftop of a building or the like.

[0015] The heat source device 3 of the water-cooled chiller 22 includes a heat storage tank 23 and a protective water heat exchanger 24. The water-cooled chiller 22 includes a chiller water-source heat pump 21 and a casing 26 that houses this. Heat exchange is performed between the circulating refrigerant of the water-source heat pump 21 and the heat storage water of the heat storage tank 23 through the circulating water flowing between the protective water heat exchanger 24 and the heat storage water heat exchanger 25. The heat storage water uses building drainage, sewage, river water, groundwater, etc.

[0016] The water-source heat pump 21 is composed of a heat storage water heat exchanger 25, a heat-source water heat exchanger 27, a compressor 28, an expansion valve 29, a four-way valve 30, and a refrigerant piping circuit 31. It repeatedly performs the processes of compression, condensation, expansion, and evaporation in sequence on the circulating refrigerant, and absorbs heat in the refrigerant evaporation process and releases heat in the refrigerant condensation process for the heat-source water and the circulating water that exchange heat with this refrigerant respectively. The water heat exchangers 25 and 27 have the same configuration as the heat-source water heat exchanger 16 of the air-cooled chiller 12.

[0017] The circulating water flowing between the heat storage water heat exchanger 25 and the protective water heat exchanger 24 exchanges heat with the heat storage water in the heat storage tank 23 in the protective water heat exchanger 24 and exchanges heat with the circulating refrigerant in the heat storage water heat exchanger 25. The heat storage water that has passed through the protective water heat exchanger 24 is drained to the outside.

[0018] As shown in FIG. 5, the chilled water type air conditioner 1 includes a chilled water coil 35 that exchanges heat between the conditioned air and the heat source water of chilled water or hot water flowing inside, a water flow control valve 36 that adjusts the heat exchange capacity of the chilled water coil 35 (the capacity to cool or heat the conditioned air) by increasing or decreasing the flow rate of the heat source water, a supply air fan 37 that supplies the conditioned air to the conditioned space, and a casing 38 that houses these components. The chilled water coil 35 has the same configuration as the heat source air heat exchanger 13 of the air-cooled chiller 12, and the heat source water flows inside. The chilled water type air conditioner 1 cools or heats the conditioned air and supplies it to the conditioned space for air conditioning.

[0019] As shown in FIGS. 5 and 6, the air-cooled outdoor unit 2 includes an outdoor air source heat pump 41 that exchanges heat between the outside air using the heat of the return air, an outdoor compressor 47 that forms part of the air source heat pump 41 and adjusts the heat exchange capacity of the air-cooled outdoor unit 2 (the capacity to cool or heat the conditioned air) by increasing or decreasing the output of the air source heat pump 41, a humidifier 51 that humidifies the outside air and adjusts the humidity of the outside air by increasing or decreasing the humidification amount, an outside air fan 42 that supplies the outside air taken in from the outside to the chilled water type air conditioner 1, an exhaust fan 43 that exhausts the return air taken in from the conditioned space to the outside, and a casing 44 that houses these components.

[0020] The air source heat pump 41 is composed of an outside air air heat exchanger 45, an exhaust air heat exchanger 46, an outdoor compressor 47, an expansion valve 48, a four-way valve 49, and a refrigerant piping circuit 50, and repeatedly performs the processes of compression, condensation, expansion, and evaporation in sequence for the circulating refrigerant, and absorbs heat in the refrigerant evaporation process and releases heat in the refrigerant condensation process for the air that exchanges heat with this refrigerant, respectively. The four-way valve 49 switches between cooling and heating operations (cooling and heating of the conditioned air). The outside air air heat exchanger 45 and the exhaust air heat exchanger 46 have the same configuration as the heat source air heat exchanger 13 of the air-cooled chiller 12.

[0021] Outdoor fresh air is supplied to the chilled and heated water air conditioner 1 through the air-cooled outdoor unit 2. The chilled and heated water air conditioner 1 takes in the outdoor air from the air-cooled outdoor unit 2 and the air (return air) from the conditioned space and supplies the air to the conditioned space. A part of the return air is taken in from the conditioned space into the air-cooled outdoor unit 2 and exhausted outdoors. The air flow direction of the air for air conditioning is shown by the thick dotted arrows. In the illustrated example, the humidifier 51 is a steam type that humidifies air with steam, but an atomizing type or other types may also be used.

[0022] As shown in FIG. 2, the heat source water circuit 4 includes a forward path 55 and a return path 56 constituted by water pipes, and a water supply pump 57 for circulating the heat source water through these, and the heat source water circulates between the heat source device 3 and the chilled and heated water coil 35 of the chilled and heated water air conditioner 1.

[0023] The forward path 55 is provided such that the heat source water is branched from the heat source device 3 to the chilled and heated water coil 35 of the chilled and heated water air conditioner 1 and then reaches the return path 56 and merges and mixes. The return path 56 is provided such that the heat source water that has passed through the chilled and heated water coil 35 of the chilled and heated water air conditioner 1 reaches the heat source device 3.

[0024] When the heat source water temperature is outside the set water temperature range, the operation of the heat source device 3 is started to cool or heat and adjust the temperature within the set water temperature range. As an example of the temperature range of the heat source water, the cold water is 7 to 12 °C and the warm water is 40 to 45 °C, but other temperature ranges are also possible.

[0025] As shown in FIG. 5, the control device 5 includes a remote controller 61, an outdoor unit cooling control unit 62, an air conditioner cooling control unit 63, an outdoor unit heating control unit 64, an air conditioner heating control unit 65, and an air supply fan control unit 66. The remote controller 61 includes a switch, input buttons for various settings, a display unit, etc., and sets the set temperature and set humidity of the conditioned space (return air), and the air conditioning mode of cooling or heating, and has a function of controlling operations such as starting and stopping the air conditioning operation and adjusting the temperature and humidity through the control device 5.

[0026] When the controlled air-conditioned space is outside the range of the set temperature and set humidity, the control device 5 controls the driving of the water volume control valve 36, the external compressor 47, the humidifier 51, and the supply air fan 37 in an interlocking manner to air-condition the controlled air-conditioned space so that it reaches the set temperature and set humidity. When the controlled air-conditioned space is within the range of the set temperature, the water volume control valve 36 is closed to stop the flow of the heat source water, and the driving of the external compressor 47 and the humidifier 51 is controlled to air-condition the controlled air-conditioned space so that it reaches the set temperature and set humidity. The control device 5 is composed of a microprocessor, various sensors, and other control devices.

[0027] When the heat source water is cold water and the air-conditioning mode is cooling, the external unit cooling control unit 62 performs one of the following operations: when the outside air temperature exceeds the set temperature and the outside air humidity is below the set humidity, the air-cooled external unit 2 performs sensible cooling of the outside air and supplies air at the set temperature in the external unit cooling and cooling operation; when the outside air temperature is below the set temperature and the outside air humidity is below the set humidity, the air-cooled external unit 2 supplies air without adjusting the temperature and humidity of the outside air in the external unit cooling and blowing operation; when the outside air humidity exceeds the set humidity, the air-cooled external unit 2 cools and dehumidifies the outside air and supplies air at the dew point temperature of the set specific enthalpy in the external unit cooling and dehumidifying operation. The set specific enthalpy is calculated from the set temperature and the set humidity.

[0028] When the heat source water is cold water and the air-conditioning mode is cooling, the air conditioner cooling control unit 63 performs one of the following operations: when the return air temperature exceeds the set temperature and the return air humidity is below the set humidity, the chilled water type air conditioner 1 performs sensible cooling of the air for air conditioning and sets the controlled air-conditioned space to the set temperature in the air conditioner cooling and cooling operation; when the return air temperature is below the set temperature and the return air humidity is below the set humidity, the chilled water type air conditioner 1 supplies air without adjusting the temperature and humidity of the air for air conditioning in the air conditioner cooling and blowing operation; when the return air humidity exceeds the set humidity, the chilled water type air conditioner 1 cools and dehumidifies the air for air conditioning and supplies air at the dew point temperature of the set specific enthalpy in the air conditioner cooling and dehumidifying operation.

[0029] When the heat source water is hot water and the air conditioning mode is heating, the outdoor unit heating control unit 64 performs one of the following operations: when the outdoor air temperature is lower than the set temperature and the outdoor air humidity is equal to or higher than the set humidity, it heats the outdoor air with the air-cooled outdoor unit 2 and supplies the air at the set temperature (outdoor unit heating and heating operation); when the outdoor air temperature is equal to or higher than the set temperature and the outdoor air humidity is lower than the set humidity, it humidifies the outdoor air with the humidifier 51 and supplies the air at the set humidity (outdoor unit heating and humidifying operation); when the outdoor air temperature is equal to or higher than the set temperature and the outdoor air humidity is equal to or higher than the set humidity, it supplies the outdoor air without adjusting the temperature and humidity with the air-cooled outdoor unit 2 (outdoor unit heating and blowing operation); when the outdoor air temperature is lower than the set temperature and the outdoor air humidity is lower than the set humidity, it heats and humidifies the outdoor air with the air-cooled outdoor unit 2 and the humidifier 51 and supplies the air at the set temperature and the set humidity (outdoor unit heating and humidifying operation).

[0030] When the heat source water is hot water and the air conditioning mode is heating, the air conditioner heating control unit 65 performs one of the following operations: when the return air temperature is lower than the set temperature, it heats the air for air conditioning with the chilled water type air conditioner 1 to set the temperature of the conditioned space to the set temperature (air conditioner heating and heating operation); when the return air temperature is equal to or higher than the set temperature, it supplies the air for air conditioning without adjusting the temperature and humidity with the chilled water type air conditioner 1 (air conditioner heating and blowing operation).

[0031] The supply air fan control unit 66 controls the supply air heat quantity per unit time by increasing or decreasing the supply air volume of the supply air fan 37 to suppress the difference between the return air temperature (the temperature of the conditioned space) and the set temperature. Thereby, even in the intermediate period when the air conditioning load is less than the minimum air conditioning capacity of the chilled water type air conditioner 1 or the air-cooled outdoor unit 2, overshoot or undershoot of the supply air heat quantity of the supply air fan 37 can be suppressed, and comfortable air conditioning with less deviation between the temperature of the conditioned space and the set temperature and less temperature unevenness can be performed.

[0032] When the air-conditioning operation is started with the remote controller 61, the air-cooled outdoor unit 2 cools or heats the outside air to the set temperature of the air-conditioned space, and the air-cooled outdoor unit 2 and the humidifier 51 dehumidify or humidify the outside air to the set humidity of the air-conditioned space, and supply air to the chilled water type air conditioner 1. The chilled water type air conditioner 1 cools or heats the air for air conditioning (outside air and return air) so that the temperature of the air-conditioned space approaches the set temperature. If the air-conditioning load decreases, the temperature of the air-conditioned space is finely adjusted by controlling the air supply volume of the air supply fan 37. In this way, the chilled water type air conditioner 1 and the air-cooled outdoor unit 2 can be interlock-controlled with a single remote controller 61 for air conditioning, the operation becomes simple, and the equipment cost can be reduced and labor can be saved.

[0033] Note that the present invention is not limited to the above-described embodiments. For example, the installation ratio of the first air-conditioning group of the air-cooled chiller and the second air-conditioning group of the water-cooled chiller can be changed, the first air-conditioning group A and the second air-conditioning group B can be placed in areas that are upside down from the illustrated example, or the areas can be subdivided and installed alternately. Further, a latent separation air-conditioning system may be configured by only one of the first air-conditioning group A and the second air-conditioning group B, and the number of the chilled water type air conditioners 1 and the air-cooled outdoor units 2 can be freely increased or decreased. In addition, the chilled water type air conditioner 1 may not be an integrated unit of the chilled water coil 35 and the air supply fan 37, but may be a separate type in which the chilled water coil 35 and the air supply fan 37 are connected by ducts as separate units, and their combinations and installation locations can be freely changed.

Explanation of Signs

[0034] 1 Chilled water type air conditioner 2 Air-cooled outdoor unit 3 Heat source device 4 Heat source water circuit 5 Control device 11 Air source heat pump for chiller 12 Air-cooled chiller 21 Water source heat pump for chiller 22 Water-cooled chiller 35 Chilled water coil 36 Water volume control valve 41 Air source heat pump for outdoor unit 47 Compressor for outdoor unit 51 Humidifier 62 External unit cooling control unit 63 Air conditioner cooling control unit 64 External unit heating control unit 65 Air conditioner heating control unit A First air conditioning group B Second air conditioning group

Claims

1. A chilled water type air conditioner (1) that exchanges heat between heat source water and air for air conditioning and supplies the air for air conditioning to the conditioned space, a heat source device (3) that adjusts the temperature of the heat source water, and a heat source water circuit (4) that circulates the heat source water between the chilled water type air conditioner (1) and the heat source device (3). The heat source device (3) includes an air-cooled chiller (12) that adjusts the temperature of the heat source water with an air source heat pump for chiller (11), and a water-cooled chiller (22) that adjusts the temperature of the heat source water with a water source heat pump for chiller (21). A first air conditioning group (A) composed of the chilled water type air conditioner (1) that exchanges heat between the heat source water of the air-cooled chiller (12) and the air for air conditioning to condition the conditioned space, and a second air conditioning group (B) composed of the chilled water type air conditioner (1) that exchanges heat between the heat source water of the water-cooled chiller (22) and the air for air conditioning to condition the conditioned space. A chilled water type latent-sensible separation air conditioning system characterized by comprising the above.

2. The chilled water type latent-sensible separation air conditioning system according to claim 1, wherein the first air conditioning group (A) is installed in the upper area to the middle area of the building, and the second air conditioning group (B) is installed in the lower area of the building.

3. The chilled water type air conditioner (1) that takes in outside air and return air as the air for air conditioning and supplies it to the conditioned space, and an air-cooled outdoor unit (2) that supplies the outside air to the chilled water type air conditioner (1) and exhausts the return air outdoors. The chilled water type air conditioner (1) includes a chilled water coil (35) that exchanges heat between the air for air conditioning and the heat source water of cold water or hot water flowing inside, and a water volume control valve (36) that adjusts the heat exchange capacity of the chilled water coil (35) by increasing or decreasing the flow rate of the heat source water. The air-cooled outdoor unit (2) includes an outdoor air source heat pump (41) that exchanges heat between the outside air by utilizing the heat of the return air, an outdoor compressor (47) that constitutes a part of the outdoor air source heat pump (41) and adjusts the heat exchange capacity of the air-cooled outdoor unit (2) by increasing or decreasing the output of the outdoor air source heat pump (41), and a humidifier (51) that humidifies the outside air and adjusts the humidity of the outside air by increasing or decreasing the humidification amount. When the conditioned space is outside the range of the set temperature and the set humidity, the driving of the water amount control valve (36), the compressor for external use (47), and the humidifier (51) is controlled to air-condition the conditioned space so that it reaches the set temperature and the set humidity. When the conditioned space is within the range of the set temperature, the water amount control valve (36) is closed, and the driving of the compressor for external use (47) and the humidifier (51) is controlled to air-condition the conditioned space so that it reaches the set temperature and the set humidity. The control device (5) is provided in the chilled and hot water type latent and sensible separation air-conditioning system according to claim 1 or 2.

4. The control device (5) is When the heat source water is the chilled water In the range where the outside air temperature exceeds the set temperature and the outside air humidity is equal to or lower than the set humidity, the outside air is sensibly cooled by the air-cooled external unit (2) and supplied at the set temperature in the external unit cooling and cooling operation In the range where the outside air temperature is equal to or lower than the set temperature and the outside air humidity is equal to or lower than the set humidity, the outside air is supplied without adjusting the temperature and humidity by the air-cooled external unit (2) in the external unit cooling and blowing operation In the range where the outside air humidity exceeds the set humidity, the outside air is cooled and dehumidified by the air-cooled external unit (2) and supplied at the dew point temperature of the set specific enthalpy in the external unit cooling and dehumidifying operation An external unit cooling control unit (62) that performs any one of the above operations When the heat source water is the chilled water In the range where the return air temperature exceeds the set temperature and the return air humidity is equal to or lower than the set humidity, the conditioned air is sensibly cooled by the chilled and hot water type air conditioner (1) to set the conditioned space to the set temperature in the air conditioner cooling and cooling operation In the range where the return air temperature is equal to or lower than the set temperature and the return air humidity is equal to or lower than the set humidity, the conditioned air is supplied without adjusting the temperature and humidity by the chilled and hot water type air conditioner (1) in the air conditioner cooling and blowing operation In the range where the return air humidity exceeds the set humidity, the conditioned air is cooled and dehumidified by the chilled and hot water type air conditioner (1) and supplied at the dew point temperature of the set specific enthalpy in the air conditioner cooling and dehumidifying operation An air conditioner cooling control unit (63) that performs any one of the above operations When the heat source water is the hot water In the range where the outside air temperature is lower than the set temperature and the outside air humidity is equal to or higher than the set humidity, the outside air is heated by the air-cooled external unit (2) and supplied at the set temperature in the external unit heating and heating operation In a range where the outside air temperature is equal to or higher than the set temperature and the outside air humidity is less than the set humidity, an outdoor unit heating and humidifying operation is performed in which the outside air is humidified by the humidifier (51) and supplied air at the set humidity. In a range where the outside air temperature is equal to or higher than the set temperature and the outside air humidity is equal to or higher than the set humidity, an outdoor unit heating and blowing operation is performed in which the outside air is supplied without temperature and humidity adjustment by the air-cooled outdoor unit (2). In a range where the outside air temperature is less than the set temperature and the outside air humidity is less than the set humidity, an outdoor unit heating and humidifying operation is performed in which the outside air is heated and humidified by the air-cooled outdoor unit (2) and the humidifier (51) and supplied air at the set temperature and the set humidity. An outdoor unit heating control unit (64) that performs any one of the above operations. When the heat source water is the warm water In a range where the return air temperature is less than the set temperature, an air conditioner heating and heating operation is performed in which the air for air conditioning is heated by the chilled water type air conditioner (1) to set the temperature of the conditioned space to the set temperature. In a range where the return air temperature is equal to or higher than the set temperature, an air conditioner heating and blowing operation is performed in which the air for air conditioning is supplied without temperature and humidity adjustment by the chilled water type air conditioner (1). An air conditioner heating control unit (65) that performs any one of the above operations. The chilled water type latent and sensible separation ventilation air conditioning system according to claim 3, comprising:

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