| 摘要 |
PURPOSE: A heat pump type hot-water heating device is provided to increase performance coefficient of a heat pump cycle and to prevent the damage of a compressor even when the temperature of outside air is low. CONSTITUTION: A heat pump type hot-water heating device is composed of a basic circuit(1) including a compressor(2), a condenser(3), a first expansion valve(4), and a waste heat evaporator(5) connected in order by pipes(6a,6b,6c); an outside air heat evaporator(7) connected to the pipes(6b,6c) by pipes(6d,6e) in parallel with the waste heat evaporator together with a second expansion valve(8); a hot-water heating closed circuit(9) having a hot-water heat exchanger(10) heated by condensing heat of the condenser and a hot water storage tank(11); and an auxiliary heating unit(14) installed at the upper part of the hot water storage tank.
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