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英国铁路工程有限公司为442型电动车组提供的热泵空调系统由斯通国际公司研制,于1984～1985年在西班牙国铁和Am-trak公司的样车上进行了试验,可逆热泵不但可加热客室,也可冷却客室。虽然系统投资高于普通空调投资的15％～20％,但是加热客车所需要的能源降低了。 1987年为Renfe公司制造的20辆卧车首先采用该系统,接着是442型电动车组和西班牙Feve公司的内燃车组分别采用。一般空调系统采用制冷剂循环来排除客
British Rail Engineering Co., Ltd. for the 442-type EMUs to provide heat pump air-conditioning system developed by Stone International, in 1984 to 1985 in Spain’s national railways and Am-trak’s prototype car was tested, the reversible heat pump can not only heat Guest room, but also cooling the guest room. Although the system investment is higher than the ordinary air-conditioning investment of 15% to 20%, but heating the bus required energy reduced. The system was first used in 20 wagons manufactured for Renfe in 1987, followed by the 442 electric fleet and the Feve internal combustion fleet in Spain. General air-conditioning systems use refrigerant circulation to exclude customers