REFRIGERATION CYCLE

PURPOSE : A refrigerating cycle is provided to prevent lowering of coefficient of performance, to secure reliability of a compressor, and to reduce the production cost. CONSTITUTION : A refrigerating cycle comprises a basic refrigerating cycle(10) and a suction air temperature control unit(30). In the basic refrigerating cycle, a first conduit(14) and a second conduit(15) are connected in parallel between a discharge conduit(12) and a receiver drier(13) of a compressor(11), and an indoor heat exchanger(16) and a pressure-reducing mechanism for cooling(18) are installed to the first conduit. An outdoor heat exchanger(17) and a pressure-reducing for heating(19) are installed to the second conduit. A first suction branch conduit(21) and a second suction branch conduit(22) are connected near the discharge conduit connection part of the first and second conduits and are connected to a suction conduit(20). The suction air temperature control unit comprises a heat storage tank(130) filled with a heat medium(132), a defrosting condenser(230), a heat exchanger(330), and a heat medium heating heat exchanger(334). The heat storage tank is installed between the indoor heat exchanger and the receiver drier of the first conduit. A re-condensation heat exchanger(131) is built in the heat storage tank. The defrosting condenser is connected between the front of the second conduit connection part of the discharge conduit and the receiver drier by a conduit(231). The heat exchanger is connected to heat storage tank by a circulation pump(332)-attached supply pipe(331) and a return pipe(333) and is installed to the suction side of the outdoor heat exchanger. The heat medium heating heat exchanger is installed to the supply pipe to maintain heat exchange relation with the defrosting condenser. © KIPO 2005