| As an environmental protection technology, air source heat pump has been widely used in our country. But due to the structural characteristics of air source heat pump, it can not work well in the cold area of north china. This issues severely limit the application of air source heat pump in the north of china. This text combines the enhanced vapor injection heat pump and the water source heat pump, study the low temperation adaptation of this system, the contents were as follow :(1) An enhanced vapor injection technology in double stage coupling heat pump was designed, and this system is analyzed by thermodynamic analyzing. The enhanced vapor injection heat pump and water source heat pump were combined by the middle water tank, and the system also can provide domestic hot water. This system can adapt different temperature in the summer and winter. The system is optimized for systematic energy efficiency ratio. By thermodynamic analyzing, the optimally loop water temperatures and single-double stage switching temperature under different operating conditions was obtained. The reliability of this system under low temperature condition is also analyzed.(2) A steady-state mathematical model is set up. Through the computer programming to calculate the run date under various working conditions. Based on simulated data, analyzing the operating parameter of heating capacity, the input work, exhaust temperature, etc. Through comparative analysis the simulated result and Laboratory test results to verify the accuracy of the simulation program, To better guide the engineering application. |
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