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Thermodynamic analysis of a transcritical CO2 heat pump integrating a vortex tube.

Number: 2247

Author(s) : MANSOUR A., PONCET S., NESREDDINE H.

Summary

A thermodynamic model is implemented to study the performance of a transcritical CO2 heat pump system integrating vortex tube. The study objective is to precisely prove that integrating a vortex tube is beneficial in raising the heat pump efficiency. The vortex tube is implemented to compensate the thermodynamic losses of the conventional expansion device and to produce more heated flow to raise the overall heating capacity of the heat pump. A validated thermodynamic model of the vortex tube was previously developed to operate with real gases and two-phase fluids and is implemented in the current study. However, for all other heat pump components, a commercial library TIL associated with the Dymola software is used to simulate the system. In addition, carbon dioxide is used as a working fluid due to its very minimal negative environmental effects, intoxicity and non-flammability and is operated under transcritical conditions. First of all, a conventional heat pump model (CHP) is validated to determine the feasibality of using the TIL library. Secondly, the vortex tube heat pump (VTHP) is compared to a CHP in terms of heating capacity and coefficient of performance (COPh). The results show that VTHP can improve the heating capacity by 30.9% while COPh can be refined by 31%. Finally, the VTHP system is analyzed parametrically to test the heat pump performance under different operating conditions: compressor discharge pressure (86-114 bar), desuperheater pressure (38-43 bar) and vortex tube cold mass fraction (0.2-0.8).

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  • Original title: Thermodynamic analysis of a transcritical CO2 heat pump integrating a vortex tube.
  • Record ID : 30030627
  • Languages: English
  • Subject: Technology
  • Source: 2022 Purdue Conferences. 19th International Refrigeration and Air-Conditioning Conference at Purdue.
  • Publication date: 2022

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