For the promotion of the Chinese market, companies currently using Hitachi compressors, including Gree, Yangzi, Hangning, AO Smith, Ariston, etc., as well as some professional heat pump manufacturers. Driven by some enterprises, all compressor companies are aware that the special compressor for heat pump is one of the development trends of the industry. According to the reporter of the Refrigeration Express, at present, the Cope, the Mitsubishi and the Matsushita, which produce rotary compressors, are developing and introducing special compressors for heat pumps. The heat pump water heater is mainly composed of a compressor, a heat exchanger, an axial flow fan, a heat preservation water tank, a water pump, a liquid storage tank, a filter, an electronic expansion valve, and an electronic automatic controller. There are two major problems in heat pump water heater technology, one is the water tank and the other is the compressor, said Le Hongsheng, manager of the heat pump promotion office of Shanghai Hitachi Electric Co., Ltd. Before 2009, heat pump water heaters used air-conditioning compressors, while air-conditioning compressors were not suitable for heat pump water heaters, and their life span was very short. At present, the special compressor for heat pump is affected by its high price and mode, and it is still in the initial stage of promotion. In addition to the heat pump-specific compressors, the insulated water tanks are also available with special products. According to the investigation of the air-conditioning and refrigeration market, the water tanks of the heat pump water heaters of other enterprises in the industry are all air-conditioned.
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