Heat pump type hot water supply apparatus

Abstract

A heat pump-type hot water supply apparatus may be provided that includes: a refrigeration cycle circuit (including a compressor, an outdoor heat exchanger, expansion devices, and an indoor heat exchanger); a hot water supply heat exchanger connected to the refrigeration cycle circuit to use the first refrigerant discharged from the compressor for a hot water supply; a cascade heat exchanger connected to the refrigeration cycle circuit to allow the first refrigerant passing through the hot water supply heat exchanger to evaporate a second refrigerant and thereafter, to be condensed, expanded, and evaporated in the refrigeration cycle circuit; a heat storage compressor compressing the second refrigerant evaporated in the cascade heat exchanger, a heat storage tank to heat water using the second refrigerant compressed by the heat storage compressor, and a heat storage expansion device to expand the second refrigerant condensed in the heat storage tank. Since the heat pump-type hot water supply apparatus may increase the heat storage temperature and additionally use the refrigerant used for hot water supply and heat storage in space air-conditioning, it may be very efficient.

Description

technical field [0001] The present invention relates to a heat pump hot water supply device, in particular to a heat pump hot water supply device which utilizes the heat of refrigerant compressed in a compressor for hot water supply and can store heat. Background technique [0002] Generally speaking, a heat pump uses the heat of heat generation or condensation of a refrigerant to transfer a low-temperature heat source to a high-temperature one, or to transfer a high-temperature heat source to a low-temperature refrigeration and heating device. [0003] A heat pump includes a compressor, an outdoor heat exchanger, an expansion mechanism, and an indoor heat exchanger. Recently, a heat pump type hot water supply device tends to be developed, which uses refrigerant compressed in a compressor to heat water and use it for hot water supply, so that Consumption of fossil fuels becomes minimal. [0004] JP 2001-263857A (2001.9.26) discloses a cooling and heating hot water supply de...

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Problems solved by technology

[0005] However, in the refrigeration, heating and hot water supply device and its control method according to the prior art, there is a problem that the refrigerant compressed by the compressor is only used for hot water supply and air conditioning, and cannot be fully utilized in various ways.

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