Heat pump type hot water supplying device

Abstract

The present invention provides a heat pump type hot water supplying device that has solved the inconvenience of an antifreeze operation being not carried out due to the phenomenon of a backflow from a hot water storage tank without increasing the number of components. A control device 70 carries out an antifreeze operation, in which a water pump 23 is operated, if the temperature of water for hot water supply in a hot water supply circuit 20 positioned in a heating unit 50 decreases to a predetermined value or less. The water pump 23 is operated if the temperature of the water for hot water supply in the hot water supply circuit 20 positioned in the heating unit 50 increases while the water pump 23 is in a stopped state.

Description

TECHNICAL FIELD[0001]The present invention relates to a heat pump type hot water supplying device adapted to heat water for hot water supply in a hot water storage tank by a heat pump circuit.BACKGROUND ART[0002]Hitherto, as this type of heat pump hot water supplying device, there has been known one that includes a tank unit incorporating a hot water storage tank that stores water for hot water supply, a hot water supply circuit in which the water for hot water supply in the hot water storage tank is taken out from a lower part of the hot water storage tank by a pump, circulated into a water heat exchanger through an inflow pipe, and led into an upper part of the hot water storage tank through an outflow pipe, and a heating unit incorporating a heat pump circuit that heats, by a refrigerant, the water for hot water supply which circulates through the water heat exchanger of the hot water supply circuit (refer to, for example, Patent Document 1).[0003]Further, the inflow pipe and the...

AI Technical Summary

Benefits of technology

The present invention is a heat pump type hot water supplying device that prevents the inconvenience of freezing of the hot water supply circuit due to the backflow phenomenon. The control device operates the water pump if the temperature of the water for hot water supply in the hot water supply circuit decreases below a predetermined value, or if the temperature of the water for hot water supply in the heating unit increases while the water pump is in a stopped state. This prevents the hot water from flowing back into the tank and ensures the hot water supply is not affected. The control device can accurately determine the occurrence of backflow phenomenon, which eliminates the need for additional components and reduces costs. The control device can also operate the water pump if the outside air temperature is the predetermined value or lower to avoid unnecessary operation of the water pump in a low outside air temperature environment.

Problems solved by technology

If the insulation is insufficient or in an environment in which the outside air temperature becomes extremely low during a winter season or the like, there have been cases where the water for hot water supply in the inflow pipe or the outflow pipe of the hot water supply circuit described above inconveniently freezes.

If the water for hot water supply freezes in the inflow pipe or the outflow pipe, then the water for hot water supply cannot be circulated through the hot water supply circuit even when a pump is actuated, eventually causing frost to build up on an evaporator in the heating unit.

This in turn inconveniently causes an air blower to hit the frost, damaging the air blower.

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