sky碎了梦2021-11-10👍543 Because of CFC refrigerant damage to the depletion of the ozone layer, natural cooling medium such as CO2 receiving more and more attention. This paper introduces the development history of CO2 as refrigerants (mainly CO2 subcritical refrigeration of the development and the application of the history) and it quit the stage of history reason; According to the CO2 as refrigerants relevant heat of the physical and chemical properties and three possible CO2 refrigeration, and explains the CO2 for refrigerants, across the superiority of the critical cycle and necessity; In countries with CO2 for refrigerants, air conditioning, refrigeration application and research of heat pump system were summarized and evaluation, and points out the defects of the present and the future direction of development.
广州扎根教育2020-07-16👍821 The design for the cold air source heat pump system application in peasant villa villa, three layers. The summer by air fan-coil unit system, with fresh air units, only by provide for indoor all wet load, don’t assume air conditioning load. From the air units, air through the main along the vertical pipe to each layer. Indoor air through the crack in the bathroom, toilet back, will not set fan clean air to the outside. Heat treatment by the water into after air fan-coil unit for heat pump, returns to handle. Winter heat treatment by the water to each room floor radiation heat transfer system, the floor radiant heat treatment system continues to use water to heat. Circulating water system of expansion tank, the circulation line for the constant pressure and moisturizing effect. Supply and return water pipes with sponge rubber insulation package, condensed into the nearest toilet. Duct USES galvanized steel. In considering the muffler design, damping, etc. 关键词:Air source heat pump hot and cold water system, fan coil units, air cooling load, and floor radiant heat system, the condensate……