Hybrid Air Conditioning System

Abstract

To provide a hybrid air conditioning system capable of sufficiently presenting a rating capability of a cold / hot water unit (radiation air conditioning) in a simple structure.SOLUTION: A hybrid air conditioning system comprises: an indoor air conditioner which prepares a cold wind or a hot wind by circulating a coolant between the indoor air conditioner and a heat pump outdoor unit; a coolant heat exchanger coupled to a coolant pipe, in which the coolant is circulated, and preparing cold water or hot water by a heat exchange with the coolant; a cold / hot water type radiation panel which performs radiation cooling / heating with the cold water or the hot water supplied through a cold / hot water pipe by the coolant heat exchanger; a direct heat exchange type hermetic tank of which the primary side is coupled through the cold / hot water pipe to the coolant heat exchanger and the secondary side is coupled through the cold / hot water pipe to the cold / hot water type radiation panel and which varies flow rates at the primary side and the secondary side; an expansion tank, which is coupled to the direct heat exchange type hermetic tank, for absorbing thermal expansion of cold water or hot water; and a proportional three-way valve which is coupled through the cold / hot water pipe to the secondary side of the direct heat exchange type hermetic tank and capable of adjusting a temperature of water feeding to the cold / hot water type radiation panel.SELECTED DRAWING: Figure 1

Description

[Technical field]

[0001] The present invention is a so-called hybrid air conditioning system that combines cooling and heating by convection from an air-cooled heat pump type air conditioner and radiant heating and cooling from the ceiling and floor surfaces. A method for controlling a hybrid air conditioning system using the Regarding. [Background technology]

[0002] Various types of air conditioning systems are used for buildings, including a central system that distributes and supplies cold and hot water prepared by a central heat source such as a large-scale refrigerator, boiler, or hot and cold water generator to the entire building. There is also a system in which relatively small air conditioners are distributed throughout the building and controlled individually.

[0003] 2. Description of the Related Art In an air-cooled heat pump package type air conditioner, a refrigerant is circulated between an outdoor unit and an indoor unit, so that cold or hot air is blown from the indoor unit into the room.

[0004] Meanwhile, as shown in Patent Document 1, a device has been proposed that performs radiant heating and cooling by supplying cold water or hot water to panels installed on the ceiling, floor, or wall.

[0005] Furthermore, as shown in Patent Document 2, a hybrid air conditioning system has been proposed that combines an air-cooling heat pump system and a radiation system. [Prior art documents] [Patent documents]

[0006] [Patent Document 1] JP 2014-40951 A [Patent Document 2] JP 2014-152971 A Summary of the Invention [Problem to be solved by the invention]

[0007] However, in hybrid air conditioning systems, radiant air conditioning using radiant panels requires a longer air conditioning start-up time (the time it takes for the indoor temperature to reach the set temperature after air conditioning is started) and the vertical temperature distribution in the room tends to be poorer during heating. On the other hand, convection air conditioning using indoor air conditioning units has the advantage of a short air conditioning start-up time and relatively good vertical temperature distribution as warm air reaches the area near the floor, but has disadvantages such as a feeling of air flow (draft feeling) and noise when blowing air compared to radiant air conditioning. For this reason, it has been difficult to appropriately control radiant air conditioning and convection air conditioning.

[0008] Furthermore, the invention disclosed in Patent Document 2 has a problem in that the rated capacity of the hot and cold water unit (radiant air conditioning) cannot be fully utilized.

[0009] The present invention has been made in consideration of the above-mentioned circumstances, and provides a hybrid air conditioning system that has a simple structure yet is capable of fully demonstrating the rated capacity of a hot and cold water unit (radiant air conditioning). It was utilized.

[0010] The present invention Purpose The object of the present invention is to provide a control method capable of optimizing room temperature control by a hybrid air conditioning system. [Means for solving the problem]

[0011] ( This control method is used Hybrid air conditioning system) The present invention, which solves the above problems, is a hybrid air conditioning system that uses both cold or hot air and cold or hot water, and includes: a heat pump outdoor unit; an indoor air conditioner that prepares cold or hot air by circulating a refrigerant between the heat pump outdoor unit; a refrigerant heat exchanger that is connected to a refrigerant piping that circulates the refrigerant and prepares cold water or hot water by heat exchange with the refrigerant; a cold / hot water type radiant panel that performs radiant heating and cooling using cold water or hot water supplied by the refrigerant heat exchanger via a cold / hot water piping; a direct heat exchange type sealed tank whose primary side is connected to the refrigerant heat exchanger via the cold / hot water piping and whose secondary side is connected to the cold / hot water type radiant panel via the cold / hot water piping, and which allows the flow rate between the primary side and the secondary side to be variable; an expansion tank that is connected to the direct heat exchange type sealed tank and absorbs thermal expansion of the cold water or hot water; and a proportional three-way valve that is connected to the secondary side of the direct heat exchange type sealed tank via the cold / hot water piping and is capable of adjusting the temperature of the water supplied to the cold / hot water type radiant panel.

[0012] Here, the "hot and cold water radiant panel" can be installed, for example, on either or both of the ceiling and floor of a room.

[0013] The flow rate and temperature difference on the refrigerant heat exchanger side can be automatically controlled within the specification range of the refrigerant heat exchanger side, and the temperature of the water supplied to the hot and cold water radiant panel can be controlled by the proportional three-way valve.

[0014] The direct heat exchange type sealed tank receives cold water or hot water of a first temperature from the refrigerant heat exchanger and cold water or hot water of a second temperature from the cold / hot water radiant panel, and mixes them; The system may be configured to deliver cold or hot water at a third temperature to the hot or cold water radiant panel, and to deliver cold or hot water at a fourth temperature to the refrigerant heat exchanger.

[0015] According to the hybrid air conditioning system of the present invention, by installing a direct heat exchange type sealed tank, the temperature difference between the inlet and outlet of the primary and secondary sides of the tank can be freely changed, thereby making it possible to fully utilize the capacity of the hot and cold water unit up to its rated capacity. In addition, the flow rate of the hot and cold water on the radiant panel side and the flow rate on the secondary side of the hot and cold water unit can be freely varied. In other words, the required flow rate can be supplied to the radiant panel without being restricted by the flow rate of the hot and cold water unit. Furthermore, by installing a proportional three-way valve on the secondary side of the direct heat exchange type sealed tank, the temperature of the water sent to the hot and cold water radiant panel can be controlled as desired.

[0016] Furthermore, in the hybrid air conditioning system according to the present invention, the use of a multi-outdoor unit for buildings and a radiant panel can improve energy saving. In other words, by utilizing an efficient multi-outdoor unit for buildings, energy saving can be realized, as can the radiant panel, which allows for a more relaxed indoor temperature setting. For example, the cooling setting temperature, which is normally 26°C, can be set to 27°C in the system according to the present invention, and the heating setting temperature, which is normally 22°C, can be set to 20°C in the system according to the present invention.

[0017] (Control method for hybrid air conditioning system) In the control method of the present invention, when performing cooling operation in the hybrid air conditioning system, an indoor dew point temperature is measured, and when the indoor dew point temperature is higher than the dew point temperature of the hot and cold water radiant panel, only the indoor air conditioner is started, When the indoor dew point temperature becomes lower than the dew point temperature of the hot and cold water radiant panel, the hot and cold water radiant panel is started and the indoor air conditioner and the hot and cold water radiant panel are operated at maximum output; After the indoor set temperature is reached, the operation of the indoor air conditioner is stopped or reduced, and the hot and cold water radiant panel is mainly operated.

[0018] In the control method of the present invention, immediately after starting a heating operation in the hybrid air conditioning system, the indoor air conditioner and the hot and cold water radiant panel are operated at maximum output, After the indoor set temperature is reached, the operation of the indoor air conditioner is stopped or reduced, and the hot and cold water radiant panel is mainly operated.

[0019] In the control method of the present invention, when the hybrid air conditioning system starts up, the surface temperature of the hot and cold water radiant panel is lowered (higher during heating), making it easier to feel the radiation immediately after start-up, while at the same time quickly setting the indoor temperature to the set temperature with the indoor air conditioner. Then, after the indoor temperature has stabilized, operation is mainly performed using the radiant air conditioning with the hot and cold water radiant panel, and the convection type indoor air conditioner operates at the minimum necessary output. This makes it possible to realize an optimal air conditioning method that combines the benefits of radiant air conditioning and convection air conditioning. [Brief description of the drawings]

[0020] [Figure 1] FIG. 1 shows the configuration of a hybrid air conditioning system according to the present invention, where (A) is a configuration diagram (block diagram) of the entire system, and (B) is an explanatory diagram showing the flow of hot and cold water around a direct heat exchange type sealed tank at maximum load. DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS

[0021] DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS The present invention relates to a hybrid air conditioning system that uses both cold or hot air and cold or hot water. A method for controlling a hybrid air conditioning system using the It is.

[0022] The hybrid air conditioning system 10 of the present invention comprises a heat pump outdoor unit 12, a number of indoor air conditioners 14 that prepare cold or hot air by circulating a refrigerant between the heat pump outdoor unit 12, and a refrigerant heat exchanger 16 that is connected to a refrigerant piping 15 that circulates the refrigerant and prepares cold water or hot water by heat exchange with the refrigerant.

[0023] The hybrid air conditioning system 10 also includes a cold / hot water radiant panel 18 that performs radiant heating and cooling using cold water or hot water supplied from the refrigerant heat exchanger 16 via cold / hot water piping 17, a direct heat exchange type sealed tank 20, an expansion tank 22 connected to the direct heat exchange type sealed tank 20 for absorbing thermal expansion of the cold water or hot water, and a proportional three-way valve 24 that can adjust the temperature of the water supplied to the cold / hot water radiant panel 18.

[0024] The direct heat exchange type sealed tank 20 has a primary side connected to the refrigerant heat exchanger 16 via the cold / hot water piping 17, and a secondary side connected to the cold / hot water radiant panel 18 via the cold / hot water piping 17, making the flow rates on the primary and secondary sides variable. The proportional three-way valve 24 is connected to the secondary side of the direct heat exchange type sealed tank 20 via the cold / hot water piping 17.

[0025] Here, the hot and cold water radiant panel 18 can be installed, for example, on either or both of the ceiling and under the floor of the room. In addition, in Fig. 1(A), the reference numeral 26 denotes a controller, and the reference numeral 28 denotes a room temperature sensor.

[0026] The flow rate and temperature difference on the refrigerant heat exchanger 16 side are automatically controlled within the specification range of the refrigerant heat exchanger 16 side, and the temperature of the water sent to the hot and cold water radiant panel 18 can be controlled by a proportional three-way valve 24.

[0027] The direct heat exchange type sealed tank 20 receives cold water or hot water of a first temperature from the refrigerant heat exchanger 16, and receives cold water or hot water of a second temperature from the cold / hot water radiant panel 18, and mixes them. Then, it is configured to send cold water or hot water of a third temperature to the cold / hot water radiant panel 18, and send cold water or hot water of a fourth temperature to the refrigerant heat exchanger 16.

[0028] 1(B), when the hybrid air conditioning system 10 is under maximum load, cold water at 15° C. enters the direct heat exchange type sealed tank 20 from the refrigerant heat exchanger 16, and cold water at 21° C. enters from the cold / hot water radiant panel 18 via the proportional three-way valve 24. Then, these cold waters are mixed inside the direct heat exchange type sealed tank 20. From the direct heat exchange type sealed tank 20, cold water at 19°C is sent to the cold / hot water radiant panel 18, and at the same time, cold water at 20°C is sent to the refrigerant heat exchanger 16. The flow rate and temperature of the cold / hot water vary depending on the load.

[0029] On the other hand, when the hybrid air conditioning system 10 is at minimum load, cold water at 15° C. enters the direct heat exchange type sealed tank 20 from the refrigerant heat exchanger 16, and at the same time, cold water at 21° C. enters the direct heat exchange type sealed tank 20 from the cold / hot water radiant panel 18. Then, these cold waters are mixed inside the direct heat exchange type sealed tank 20. From the direct heat exchange type sealed tank 20, cold water at 19° C. is sent to the cold / hot water radiant panel 18, and at the same time, cold water at 17° C. is sent to the refrigerant heat exchanger 16.

[0030] (Control method for hybrid air conditioning system) Next, a room temperature control method of the hybrid air conditioning system 10 using the controller 26 will be described. When performing cooling operation, the room temperature sensor 28 measures the indoor dew point temperature, and if the indoor dew point temperature is higher than the dew point temperature of the chilled / hot water radiant panel 18, only the indoor air conditioner 14 is started. Thereafter, when the indoor dew point temperature becomes lower than the dew point temperature of the chilled / hot water radiant panel 18, the chilled / hot water radiant panel 18 is started, and the indoor air conditioner 14 and the chilled / hot water radiant panel 18 are operated at maximum output. Then, after the indoor temperature reaches the set temperature, the operation of the indoor air conditioner 14 is stopped or reduced, and air conditioning operation is continued mainly by the chilled / hot water radiant panel 18.

[0031] On the other hand, immediately after starting the heating operation, the indoor air conditioner 14 and the hot and cold water radiant panel 18 are operated at maximum output, and after the indoor set temperature is reached, the operation of the indoor air conditioner 14 is stopped or reduced, and the hot and cold water radiant panel 18 is mainly operated.

[0032] In the control method of the present invention, when the hybrid air-conditioning system 10 is started up, the surface temperature of the hot and cold water radiant panel 18 is lowered (higher during heating), making it easier to feel the radiation immediately after start-up, while at the same time quickly bringing the indoor temperature to the set temperature with the indoor air conditioner 14. Then, after the indoor temperature has stabilized, operation is mainly performed using radiant air conditioning by the hot and cold water radiant panel 18, and the convection type indoor air conditioner 14 is operated at the minimum necessary output. This makes it possible to realize an optimal air-conditioning method that combines the benefits of radiant air conditioning and convection air conditioning.

[0033] Although the present invention has been described above with reference to the embodiments, the present invention is not limited to these embodiments and can be modified as appropriate within the scope of the technical concept of the present invention.

Claims

1. A control method using a hybrid air conditioning system that uses both cold air or hot air and cold water or hot water, A heat pump outdoor unit; an indoor air conditioner that prepares cold air or hot air by circulating a refrigerant between the indoor air conditioner and the heat pump outdoor unit; A refrigerant heat exchanger that is connected to a refrigerant pipe that circulates the refrigerant and prepares cold water or hot water by heat exchange with the refrigerant; A hot and cold water radiant panel that performs radiant heating and cooling using cold water or hot water supplied through a hot and cold water pipe by the refrigerant heat exchanger; a direct heat exchange type sealed tank having a primary side connected to the refrigerant heat exchanger via the hot and cold water piping and a secondary side connected to the hot and cold water radiant panel via the hot and cold water piping, the flow rate of the primary side and the secondary side being variable; an expansion tank connected to the direct heat exchange type sealed tank for absorbing thermal expansion of the cold water or hot water; a proportional three-way valve connected to the secondary side of the direct heat exchange type sealed tank via the hot and cold water piping and capable of adjusting the temperature of water supplied to the hot and cold water radiant panel; The present invention relates to a control method for a hybrid air conditioning system comprising: When the hybrid air conditioning system is in cooling operation, the indoor dew point temperature is measured, When the indoor dew point temperature is higher than the dew point temperature of the hot and cold water radiant panel, only the indoor air conditioner is started; When the indoor dew point temperature becomes lower than the dew point temperature of the hot and cold water radiant panel, the hot and cold water radiant panel is started and the indoor air conditioner and the hot and cold water radiant panel are operated at maximum output; A control method for a hybrid air conditioning system, characterized in that after the indoor set temperature is reached, operation of the indoor air conditioner is stopped or reduced, and the hot and cold water radiant panel is mainly operated.

2. A control method using a hybrid air conditioning system that uses both cold air or hot air and cold water or hot water, A heat pump outdoor unit; an indoor air conditioner that prepares cold air or hot air by circulating a refrigerant between the indoor air conditioner and the heat pump outdoor unit; A refrigerant heat exchanger that is connected to a refrigerant pipe that circulates the refrigerant and prepares cold water or hot water by heat exchange with the refrigerant; A hot and cold water radiant panel that performs radiant heating and cooling using cold water or hot water supplied through a hot and cold water pipe by the refrigerant heat exchanger; a direct heat exchange type sealed tank having a primary side connected to the refrigerant heat exchanger via the hot and cold water piping and a secondary side connected to the hot and cold water radiant panel via the hot and cold water piping, the flow rate of the primary side and the secondary side being variable; an expansion tank connected to the direct heat exchange type sealed tank for absorbing thermal expansion of the cold water or hot water; a proportional three-way valve connected to the secondary side of the direct heat exchange type sealed tank via the hot and cold water piping and capable of adjusting the temperature of water supplied to the hot and cold water radiant panel; The present invention relates to a control method for a hybrid air conditioning system comprising: Immediately after starting heating operation in the hybrid air conditioning system, the indoor air conditioner and the hot and cold water radiant panel are operated at maximum output, A control method for a hybrid air conditioning system, characterized in that after the indoor set temperature is reached, operation of the indoor air conditioner is stopped or reduced, and the hot and cold water radiant panel is mainly operated.

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