Heat pump-type hot-water supply device

Abstract

The invention provides a heat pump-type hot-water supply device which includes a heat source-side heat pump unit having a radiation heat exchanger for radiating heat from refrigerant by condensing the refrigerant. The hot-water supply device further includes a hot-water supply unit having a water tank where water is contained, water supply piping for supplying external water into the water tank, water circulation piping communicating with both a bottom section and an upper section of the water tank and circulating water in the bottom section to the upper section of the water tank in a bypassing manner, an absorption heat exchanger located in the middle of the water circulation piping and joined to the radiation heat exchanger of the heat source-side heat pump unit such that the absorptionheat exchanger can absorb heat, and a hot-water supply unit for supplying hot water in the upper section of the water tank to the outside. The water supply piping is branched off into a first water supply route and a second water supply route. The first water supply route supplies, without treatment, the water supplied from the outside into the water tank, and the second water supply route supplies the water from the outside into the water tank after improving the quality of the water by a water quality adjustment unit so that the water does not produce scale. Either or both of the water supply routes are used appropriately depending on the quality of water supplied. As a result, scale deposition is suppressed.

Description

technical field [0001] The present invention relates to a heat pump hot water supply device that heats water in a water tank with a heat pump unit and supplies the heated water in the water tank. Background technique [0002] A heat pump type hot water supply device has been proposed, for example, as an energy-saving hot water supply device (see Patent Document 1 and Patent Document 2). [0003] Such as Figure 8 As shown, in this hot water supply device, the heat source side heat pump unit A is composed of the following parts: a compressor 1, which compresses the refrigerant to obtain a high-temperature and high-pressure refrigerant; a heat radiation heat exchanger (condenser) 2, It condenses the high-temperature and high-pressure refrigerant compressed by the compressor 1 to dissipate heat from the refrigerant; the expansion valve 3 decompresses the high-pressure refrigerant condensed by the heat radiation heat exchanger 2 and an air heat exchanger (evaporator) 4 that abs...

AI Technical Summary

Problems solved by technology

[0014] However, in the case of low-temperature operation, the specified amount of hot water is not stored, and it is necessary to operate not only at night but also during the day, and a hot water storage tank with a large margin is required.

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