Air conditioner

Abstract

To provide an air conditioner which requires a plurality of types of heat exchangers and a plurality of types of heat source machines, and which can effectively use the heat exchangers for dehumidification.SOLUTION: A control part 10, at the time of an outside air utilizing mode, in a state where a second heat source machine 5 is stopped, allows a fluid that has flowed out of a first heat exchanger 2 to flow into a second heat exchanger 3 and allows the fluid to exchange heat with the outside air, and returns the fluid which has flowed out from the second heat exchanger 3 to a first heat source machine 4. Thereby, in the first heat source machine 4, cold or heat can be generated by utilizing the cold of the outside air at the time of a non-dehumidifying mode. Therefore, the second heat exchanger 3 which is the heat exchanger for dehumidification can be utilized effectively.SELECTED DRAWING: Figure 4

Description

[Technical Field]

[0001] The present disclosure relates to an air conditioner with a dehumidifying function. [Background technology]

[0002] For example, in the air conditioning device described in Patent Document 1, a first heat exchanger for cooling the air is provided in a passageway that returns the air sucked from the room back into the room, and a second heat exchanger for dehumidification is provided in a passageway that introduces outside air into the room.

[0003] The first heat exchanger is set to a temperature that maintains the indoor air temperature at a set temperature. The second heat exchanger is set to a temperature below the dew point of the outdoor air to dehumidify it. The set temperature is usually well above the dew point. [Prior art documents] [Patent documents]

[0004] [Patent Document 1] Japanese Patent Application Publication No. 2018-63086 Summary of the Invention [Problem to be solved by the invention]

[0005] For this reason, the invention described in Patent Document 1 includes a first heat source unit that supplies cold heat to the first heat exchanger and a second heat source unit that supplies cold heat to the second heat exchanger. In other words, the invention described in Patent Document 1 requires multiple types of heat exchangers and multiple types of heat source units.

[0006] The present disclosure discloses an example of an air conditioner that requires multiple types of heat exchangers and multiple types of heat source units and that can effectively utilize a dehumidifying heat exchanger. [Means for solving the problem]

[0007] An air conditioner that conditions the air inside a room preferably has at least one of the following components. That is, the constituent elements are a first heat exchanger (2) that exchanges heat between air drawn from inside the room and a fluid, and supplies the air that has been heat-exchanged into the room; a first heat source unit (4) that supplies heat to the fluid that is supplied to the first heat exchanger (2), and that is capable of generating at least cold heat; a second heat exchanger (3) that is provided in a ventilation passage (7) that leads from the outside of the room to the inside of the room, and that exchanges heat between the air circulating through the ventilation passage (7) and the fluid; a second heat source unit (5) that cools the fluid that is supplied to the second heat exchanger (3); The system includes one or more valves (V1 to V6) for switching the flow path, and a control unit (10) capable of controlling the valves (V1 to V6) and the heat generated in the first heat exchanger (2) and the second heat exchanger (3), and the control unit (10) is capable of operating in a dehumidification mode, a cooling mode, and an outdoor air utilization mode, and in the outdoor air utilization mode, the fluid flowing out of the first heat exchanger (2) flows into the second heat exchanger (3) to exchange heat between the fluid and the outdoor air, and the fluid flowing out of the second heat exchanger (3) is returned to the first heat source unit (4).

[0008] The outdoor air utilization mode is an operation mode executed in the non-dehumidification mode. The dehumidification mode is an operation mode for dehumidifying the outdoor air to be supplied to the room. The control unit (10) controls the second heat exchanger (3) to generate cold energy in the dehumidification mode, and controls the first heat exchanger (2) to generate cold energy in the cooling mode.

[0009] This allows the first heat source unit (4) of the air conditioner to generate cold energy by utilizing the cold energy of the outside air in the non-dehumidification mode, thereby enabling the second heat exchanger (3), which is a dehumidification heat exchanger, to be used effectively.

[0010] Incidentally, the symbols in each of the parentheses above are examples showing the correspondence with the specific configurations, etc. described in the embodiments described below, and the present disclosure is not limited to the specific configurations, etc. shown by the symbols in the parentheses above. [Brief explanation of the drawings]

[0011] [Figure 1] 1 is a schematic diagram of an air conditioning device according to a first embodiment. [Figure 2] 1 is a control system block diagram of an air conditioner according to a first embodiment. [Figure 3] FIG. 2 is an operation diagram of the air conditioner according to the first embodiment in a normal mode. [Figure 4] FIG. 2 is an operational diagram of the air conditioner according to the first embodiment in an outside air utilization mode. DETAILED DESCRIPTION OF THE INVENTION

[0012] The following "embodiments of the invention" are examples of embodiments that fall within the technical scope of the present disclosure. In other words, the invention-specific matters described in the claims are not limited to the specific configurations and structures shown in the following embodiments.

[0013] At least one of a component or part that is described with a reference numeral is provided unless otherwise specified, such as "one." The air conditioning device shown in this disclosure includes at least one of the components such as the component or part that is described with a reference numeral and the structural parts shown in the drawings.

[0014] (First embodiment) <1. Overview of air conditioning equipment> In this embodiment, an example of an air conditioning system according to the present disclosure is applied to a building air conditioning system. As shown in Fig. 1, the air conditioning system 1 includes at least a first heat exchanger 2, a second heat exchanger 3, a first heat source unit 4, a second heat source unit 5, a blower 6, and a plurality of valves V1 to V6.

[0015] The first heat exchanger 2 is a heat exchanger that exchanges heat between air drawn in from the room (hereinafter referred to as room air) and a fluid (chilled water in this embodiment), and supplies the heat-exchanged room air to the room. The first heat source unit 4 cools the fluid to be supplied to the first heat exchanger 2.

[0016] The first heat source unit 4 according to this embodiment uses cold or hot heat generated by the vapor compression refrigerator to supply cold or hot heat to the fluid, thereby generating cold water or hot water. The fluid is supplied to the first heat exchanger 2 by the pump P1.

[0017] The second heat exchanger 3 is provided in a ventilation passage 7 leading from the outside to the inside of the room, and is a heat exchanger that exchanges heat between a fluid and air (hereinafter referred to as outside air) flowing through the ventilation passage 7. The second heat source unit 5 cools the fluid (chilled water in this embodiment) to be supplied to the second heat exchanger 3.

[0018] The second heat source unit 5 uses cold energy generated by a vapor compression chiller or an absorption (adsorption) chiller to supply cold energy to the fluid to generate chilled water. The fluid is supplied to the second heat exchanger 3 by a pump P2.

[0019] The blower 6 supplies the room with the inside air cooled by the first heat exchanger 2 and the outside air cooled by the second heat exchanger 3. The multiple valves V1 to V6 are valves for switching the fluid flow paths.

[0020] In addition to the configuration shown in FIG. 1, the air conditioner 1 includes at least a control unit 10, an indoor temperature sensor S1, an indoor humidity sensor S2, an indoor carbon dioxide concentration sensor S3, a return water temperature sensor S4, and an outdoor air temperature sensor S5, as shown in FIG. 2.

[0021] The control unit 10 controls the operation of the multiple valves V1 to V6, the blower 6, the first heat source unit 4, the second heat source unit 5, the pumps P1 and P2, etc. The control unit 10 controls the multiple valves V1 to V6, etc., in accordance with a pre-stored program using the detection signals of the sensors S1 to S5.

[0022] The control unit 10 is an electronically controlled controller configured by a computer having a CPU, ROM, RAM, etc. The above programs are stored in advance in a nonvolatile storage unit (not shown) such as a ROM.

[0023] The indoor temperature sensor S1 detects the indoor air temperature. The indoor humidity sensor S2 detects the indoor relative humidity. The indoor carbon dioxide concentration sensor S3 detects the indoor carbon dioxide concentration. The return water temperature sensor S4 detects the temperature of the cold water flowing out from the first heat exchanger 2. The outdoor air temperature sensor S5 detects the temperature of the outdoor air before heat exchange with the second heat exchanger 3.

[0024] <2. Air conditioner operation mode> The air conditioner 1 according to this embodiment can operate in a cooling mode, a heating mode, and an outdoor air utilization mode in a dehumidification mode. The dehumidification mode is an operation mode in which the outdoor air to be supplied to the room is dehumidified.

[0025] The cooling mode is an operation mode for cooling the room. The heating mode is an operation mode for heating the room. The outdoor air use mode is an operation mode executed in the non-dehumidification mode. In the dehumidification mode, the cooling mode and the heating mode are collectively referred to as the normal mode.

[0026] <Dehumidification mode> In the dehumidification mode, the control unit 10 generates cold heat in the second heat exchanger 3. At this time, the control unit 10 controls the operation of the second heat source unit 5 so that the temperature of the cold heat generated in the second heat source unit 5 is equal to or lower than the dew point of the outside air flowing into the second heat exchanger 3.

[0027] 3, in the dehumidification mode, the control unit 10 opens valves V2 and V4 and closes valves V3 and V5, and supplies chilled water generated by the second heat source unit 5 to the second heat exchanger 3. As a result, the chilled water circulates between the second heat source unit 5 and the second heat exchanger 3.

[0028] The dehumidification mode is an operation mode that can be used in combination with the cooling mode or the heating mode. In this embodiment, the dehumidification mode is automatically executed so that the indoor humidity sensor S2 is within a predetermined range.

[0029] <Cooling mode / Heating mode> In the cooling mode, the control unit 10 generates cold heat in the first heat exchanger 2. At this time, the control unit 10 uses the indoor temperature sensor S1 and the set temperature to control the temperature of the cold water generated by the first heat source unit 4. The set temperature is the target indoor air temperature.

[0030] Incidentally, the set temperature is usually higher than the dew point of the outside air. For this reason, the cold energy generated by the first heat source unit 4 and the cold energy generated by the second heat source unit 5 are different, so it is difficult to achieve both temperature adjustment of the inside air (sensible heat processing) and dehumidification of the outside air (latent heat processing) with one type of heat source unit.

[0031] In the heating mode, the control unit 10 generates heat in the first heat exchanger 2. At this time, the control unit 10 controls the temperature of the hot water generated by the first heat source unit 4, etc., using the indoor temperature sensor S1 and the set temperature.

[0032] 3, in the cooling mode or the heating mode, the control unit 10 opens the valves V1 and V6 and closes the valves V3 and V5, and supplies the cold water or hot water generated by the first heat source unit 4 to the first heat exchanger 2. As a result, the fluid circulates between the first heat source unit 4 and the first heat exchanger 2.

[0033] <Outdoor air use mode> In the outdoor air utilization mode, as shown in FIG. 4, the control unit 10 causes the fluid flowing out of the first heat exchanger 2 to flow into the second heat exchanger 3 to exchange heat between the fluid and the outdoor air, and returns the fluid flowing out of the second heat exchanger 3 to the first heat source unit 4.

[0034] Specifically, the control unit 10 closes the valves V2 and V4 and opens the valves V1, V3, and V5 while stopping the second heat source unit 5. As a result, the fluid flowing out of the first heat source unit 4 returns to the first heat source unit 4 again via the first heat exchanger 2 and the second heat exchanger 3.

[0035] The outdoor air use mode is an operation mode that can be used in combination with the cooling mode or the heating mode. The control unit 10 according to this embodiment automatically executes the outdoor air use mode using the detection values ​​of the return water temperature sensor S4 and the outdoor air temperature sensor S5.

[0036] That is, in the cooling mode, the control unit 10 executes the outdoor air utilization mode when the temperature difference ΔT is equal to or greater than a predetermined value greater than 0. In addition, in the heating mode, the control unit 10 executes the outdoor air utilization mode when the temperature difference ΔT is equal to or less than a predetermined value less than 0.

[0037] The temperature difference ΔT is the value obtained by subtracting the outside air temperature from the return water temperature. The return water temperature is the temperature detected by the return water temperature sensor S4. The outside air temperature is the temperature detected by the outside air temperature sensor S5.

[0038] <About ventilation> Regardless of whether the dehumidification mode or the outdoor air utilization mode is being executed, the control unit 10 basically introduces outdoor air into the room to ventilate the room. In other words, the control unit 10 adjusts the amount of outdoor air introduced so that the detection value of the indoor carbon dioxide concentration sensor S3 falls within a predetermined range.

[0039] 3. Features of the Air Conditioner According to the Present Embodiment The first heat source unit 4 of the air conditioner according to this embodiment can generate cold or hot heat by utilizing cold energy from outside air in the non-dehumidification mode, which makes it possible to effectively utilize the second heat exchanger 3, which is a dehumidification heat exchanger.

[0040] (Other embodiments) In the air conditioning device according to the above embodiment, one first heat source unit 4 supplies heat to one first heat exchanger 2. However, the present disclosure is not limited to this. That is, the present disclosure may be configured such that one first heat source unit 4 supplies heat to multiple first heat exchangers 2, for example.

[0041] In the air conditioning device according to the above embodiment, one second heat source unit 5 supplies cold heat to one second heat exchanger 3. However, the present disclosure is not limited to this. That is, the present disclosure may be configured such that one second heat source unit 5 supplies cold heat to multiple second heat exchangers 3, for example.

[0042] In the above-described embodiment, the control unit 10 automatically executes the outdoor air utilization mode based on the temperature difference ΔT. However, the present disclosure is not limited to this. That is, the present disclosure may be configured such that the outdoor air utilization mode is executed by manual operation by the user, for example.

[0043] In addition, even if the user selects to execute the outdoor air utilization mode, if the above-mentioned requirements regarding the temperature difference ΔT are not met, the control unit 10 may be configured to not allow the execution of the outdoor air utilization mode, and to allow the execution of the outdoor air utilization mode if the requirements are met.

[0044] Furthermore, the present disclosure is not limited to the above-described embodiments as long as it conforms to the spirit of the disclosure described in the above-described embodiments. Therefore, the present disclosure may be a configuration in which at least two of the above-described embodiments are combined, or a configuration in which any of the components illustrated or described with reference numerals in the above-described embodiments is eliminated. [Explanation of symbols]

[0045] 1…Air conditioner 2... 1st heat exchanger 3…Second heat exchanger 4... 1st heat source machine 5…Second heat source machine 6... Blower 7... Ventilation passage 10... Control section P1... Pump P2: Pump V1~V6... Valves

Claims

1. In an air conditioning device that conditions the air inside a room, a first heat exchanger that exchanges heat between air drawn from a room and a fluid, and supplies the air that has been subjected to heat exchange into the room; a first heat source unit that supplies heat to a fluid that is supplied to the first heat exchanger and is capable of generating at least cold heat; a second heat exchanger provided in a ventilation passageway leading from the outside of the room to the inside of the room and exchanging heat between air flowing through the ventilation passageway and a fluid; a second heat source unit for cooling a fluid to be supplied to the second heat exchanger; one or more valves for switching fluid flow paths; a control unit capable of controlling the valve and heat generated in the first heat exchanger and the second heat exchanger, and capable of executing a dehumidification mode, a cooling mode, and an outdoor air utilization mode; The dehumidification mode is an operation mode for dehumidifying the outside air to be supplied to the room, the cooling mode is an operation mode for cooling the room, and the outside air utilization mode is an operation mode executed in a non-dehumidification mode, Furthermore, the control unit In the dehumidification mode, cold heat is generated by the second heat exchanger, In the cooling mode, cold heat is generated by the first heat exchanger, In the outside air utilization mode, the fluid flowing out of the first heat exchanger is caused to flow into the second heat exchanger to exchange heat between the fluid and outside air, and the fluid flowing out of the second heat exchanger is returned to the first heat source unit. Air conditioner.

2. a first temperature sensor that detects the temperature of the fluid flowing out of the first heat exchanger; a second temperature sensor that detects the temperature of the outside air before heat exchange with the second heat exchanger; When the temperature detected by the first temperature sensor is the return temperature, the temperature detected by the second temperature sensor is the outside air temperature, and a value obtained by subtracting the outside air temperature from the return temperature is the temperature difference, The air conditioner according to claim 1 , wherein the control unit is capable of permitting execution of the outdoor air utilization mode in the cooling mode when the temperature difference is equal to or greater than a predetermined value greater than zero.

3. The control unit is capable of executing a heating mode for heating the room, The control unit generates heat in the first heat exchanger in the heating mode, The air conditioner according to claim 2 , further comprising: a controller configured to permit execution of the outdoor air utilization mode in the heating mode when the temperature difference is equal to or less than a predetermined value smaller than zero.

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