R22的压焓图,在暖通工程设计，系统设计过程中用得到-R22 in the pressure-enthalpy diagram, in the HVAC engineering design, system design process has been used

查询各种制冷剂物性参数，画制冷循环图，包括单级压缩，双极压缩(Inquire about the parameters of various refrigerants, draw a refrigeration cycle diagram, including single stage compression, bipolar compression)