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Simulation study on the performance of closed air source heat pump drying system.

Number: 2119

Author(s) : WU Q.

Summary

The simulation model of closed air source heat pump drying system is built in dynamic simulation platform - Dymola, which has been calibrated with experiment data. The simulation results after calibration are basically consistent with the trend of experiment data, and meet the accuracy requirements of simulation analysis. On this basis, the effects of compressor displacement, expansion valve flow area and refrigerant charge (R134a) on the performance of closed air source heat pump drying system are analyzed. Simulation results show: The increase of compressor displacement will lead to the increase of compressor discharge pressure, system power and heating capacity, and the slight reduction of suction pressure. Heating COP first increases and then decreases with the increase of compressor displacement, which means an optimal value. The increase of expansion valve flow area will lead to the rapid reduction of compressor discharge pressure, system power and heating capacity, as well as the increase of suction pressure. With the increase of expansion valve flow area, heating COP first increases and then decreases, and there is an optimal value. The increase of refrigerant charge will lead to the increase of compressor discharge pressure, suction pressure and system power. With the increase of refrigerant charge, heating capacity and heating COP first increases and then decreases. There is an optimal value for both of them, but the corresponding refrigerant charge of optimal value is different. Through optimization analysis, the combination of the maximum heating COP of the closed heat pump dryer unit in this paper is the compressor displacement of 27.8CC·rev-1, the expansion valve flow area of 0.87mm2 and the refrigerant charge of 1.374kg. In this case, the maximum heating COP is 2.544 and the corresponding heating capacity is 5395W.

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Pages: 11 p.

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  • Original title: Simulation study on the performance of closed air source heat pump drying system.
  • Record ID : 30032983
  • Languages: English
  • Source: 2024 Purdue Conferences. 20th International Refrigeration and Air-Conditioning Conference at Purdue.
  • Publication date: 2024/07/17

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