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摘要

PROBLEM TO BE SOLVED: To reduce equipment costs and radiation loss, and to improve COP by directly accommodating or arranging a heat pump radiation part at the side of a hot water storage tank, and performing lamination boiling-up due to natural convection.;SOLUTION: With a heat pump A and a hot-water storage tank 6, a heat transfer pipe 7 for radiating the condensation part refrigerant part of the heat pump is arranged and accommodated in the tank 6, the high-temperature discharge gas of the heat pump is allowed to flow into the heat transfer pipe 7 from the upper portion to the lower portion of the hot-water storage tank 6 with a temperature distribution that is opposite to that of water in the tank, at the same time a convection control guide 8 for sucking cold water at the bottom of the tank from a lower portion and guiding the water into an upper portion is arranged in the tank, and cold water at the bottom side of the hot-water storage tank is guided to the uppermost part of the tank while increasing temperature along the guide 8, is successively subjected to lamination boiling-up due to natural convection from the upper portion of the tank to the lower portion for storing hot water in the tank.;COPYRIGHT: (C)2001,JPO