Experimental Study of the Energy Efficiency of Air Energy Heat Pump System for Multistage Waste Heat Recovery
Considering heat pump system's poor efficiency in recovering waste heat and its low heat ex-changing efficiency and poor working adaptability at low temperature environment,having the air-hot sys-tem's technical approaches of free heat recovery and heat distribution based to design air energy heat pump system which boasting of multi-stage waste heat recovery was implemented.The experimental results show that,the waste heat recovery can effectively improve thermal efficiency of the air energy heat pump system for hot air drying,and the highest energy efficiency ratio of the heat pump can reach 1.51 times of the COP in the non-regenerative operation mode.The environmental temperature has a decisive influence on select-ing the waste heat recovery mode.As for a certain ambient temperature,the COP of the heat pump system decreases when the heating temperature increases,but advantages and disadvantages of different waste heat recovery modes to improve efficiency of the heat pump system doesn't change with the heating temperature.When the experimental conditions and the waste heat recovery mode are fixed,the COP of the heat pump system has extreme relationship with the fresh air flux.
air energy heat pumpmultistage waste heat recoveryhot-air dryingCOP
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