Hot water supply system
A technology of hot water supply and intermediate heat exchanger, which is applied in heating systems, residential hot water supply systems, household heating, etc., and can solve the problems of reduced heat exchange efficiency of air heat exchangers
Inactive Publication Date: 2013-01-16
TOSHIBA CARRIER CORP
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Problems solved by technology
[0004] However, in this hot water supply system, the air heat exchanger constituting the refrigeration cycle on the low-temperature side functions as an evaporator during hot water supply operation, and therefore, it is unavoidable especially when operating under low outside air temperature conditions. Cases of frost formation on the air heat exchanger
In this state, the heat exchange efficiency of the air heat exchanger decreases with the passage of time, so defrosting operation is required
Method used
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Embodiment Construction
[0012] figure 1 It is a structural diagram of the refrigeration cycle of the hot water supply system, and particularly shows the switching state of the refrigeration cycle during the defrosting operation.
[0013] This hot water supply system is composed of a high-temperature side refrigeration cycle Ra, a hot water pipe H, a low-temperature side refrigeration cycle Rb, and a control unit (control element) S.
[0014] The high temperature side refrigeration cycle Ra will be described below. The discharge part a of the high temperature side compressor 1, the water heat exchanger 2, the liquid receiver 3, the high temperature side expansion device 4, the heat absorbing part 5a of the intermediate heat exchanger 5, the gas The liquid separator 6 is sequentially connected through the refrigerant pipe P, and the gas-liquid separator 6 communicates with the suction part b of the high temperature side compressor 1 .
[0015] Regardless of whether it is during the hot water supply op...
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A binary refrigeration cycle is formed from a low temperature-side refrigeration cycle (Rb) requiring a four-way switching valve (11) and a high temperature-side refrigeration cycle (Ra) not requiring the four-way switching valve (11), and heat is exchanged by means of an intermediate heat exchanger (5) disposed in each of the refrigeration cycles. A hot water pipe (H) is laid in a water-heat exchanger (2) of the high temperature-side refrigeration cycle (Ra), and water or hot water is supplied for use as hot water having a high temperature. One end of a bypass circuit (B) is connected to a refrigerant pipe (P) between the water-heat exchanger and a high temperature-side compressor (1) of the high temperature-side refrigeration cycle (Ra), the other end is connected to a refrigerant pipe between a high temperature-side expansion device (4) and the intermediate heat exchanger, and a fluid control valve (8) is disposed midway between the two ends. A control unit (S) performs control such that the fluid control valve (8) is opened and the high temperature-side expansion device is closed during a defrosting operation for an air-heat exchanger (12) of the low temperature-side refrigeration cycle (Rb), and thereby achieves specific control during a defrosting operation for an evaporator of the low temperature-side refrigeration cycle (Rb) and makes it possible to reduce the number of components and to carry out efficient defrosting operations.
Description
technical field [0001] Embodiments of the present invention relate to a hot water supply system that supplies warm water using a cascade refrigeration cycle. Background technique [0002] The cascade refrigeration cycle is often used. This cascade refrigeration cycle connects the high-temperature side refrigeration cycle and the low-temperature side refrigeration cycle through an intermediate heat exchanger, so that the refrigerant circulating in the high-temperature side refrigeration cycle and the low-temperature side The refrigerant circulating in the refrigeration cycle is heat-exchanged in the intermediate heat exchanger to obtain a high compression ratio (for example, Japanese Patent Laid-Open No. 2000-320914). [0003] In addition, a water heat exchanger is included as a condenser constituting the high-temperature side refrigeration cycle, and water or warm water is guided to the water heat exchanger through warm water piping. Water or warm water is converted into hi...
Claims
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IPC IPC(8): F25B47/02F24H1/00F25B7/00
CPCF24D17/02F24D19/1054F25B7/00F25B13/00F25B47/025F25B2313/02741F25B2339/047F25B49/02F25B2400/0411F25B2600/2513F25B2600/2501F25B2400/0403F24H4/02F25B47/02
Inventor 图司贵宏浅利峻
Owner TOSHIBA CARRIER CORP