Study on the Performance of a Novel High Temperature Coupled Heat Pump Cycle
Efficient utilization of waste heat is a crucial approach to achieving energy conservation and emission reduction.In recent years,the highly efficient heat pump technology has been widely applied in industrial waste heat recovery due to its excellent energy utilization efficiency.However,the narrow operating temperature range of compression and absorption heat pumps makes it chal-lenging to meet the"large temperature rise"heat exchange requirements in industrial waste heat recovery at higher heating temperatures.Firstly,this paper analyzes the circulating principle of the new high-temperature coupled heat pump.Secondly,it establishes a thermodynamic steady-state mathematical model for the coupled heat pump.According to calculations under the design condi-tions of a chemical waste heat project,when the waste heat inlet temperature is 90℃,the coupled heat pump can produce hot water at 115℃ with a COP of 2.33.The effects of compressed circu-lation condensing temperature,medium temperature waste outlet temperature,and cooling water outlet temperature on the performance of the coupled heat pump cycle are analyzed.Compared with conventional technology,this new high-temperature coupled heat pump can efficiently transfer"large temperature difference"under higher heating temperatures and demonstrates good technical economy potential for market application.
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