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Leveraging system simulation to support the design of a reversible heat pump.

Number: 2322

Author(s) : REVEILLERE A., JIN Z.

Summary

Improving the efficiency of heat pumps while using refrigerants with low global warming potential is at the heart of the transformation of the HVAC industry. To address these challenges, system simulation provides reliable data at every step of the design phase, from system architecture evaluation to heat exchanger sizing or virtual control system validation. In this paper we start deriving the thermodynamic heating and cooling target cycles from power and temperature requirements. During this static analysis, different refrigerants are explored. These cycles then provide the nominal conditions that determine the sizing of each component of the system using steady-state simulations. Particular attention is paid to heat exchanger models where appropriate heat exchange correlations are essential to ensure the predictivity of the results and where sufficient discretization allows a thorough understanding of the phase change. Through careful examination of local void fractions and slip ratios, valuable information on the refrigerant charge distribution within the system is collected and studied. System performance is ensured by one or more electronic expansion valves whose control strategy is validated using dynamic simulations. Finally, this complete closed-loop heat pump model is used as a virtual testbed to run hundreds of simulations under all possible external conditions to extract performance maps even before prototyping.

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Pages: 10 p.

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  • Original title: Leveraging system simulation to support the design of a reversible heat pump.
  • Record ID : 30033178
  • Languages: English
  • Subject: Technology
  • Source: 2024 Purdue Conferences. 20th International Refrigeration and Air-Conditioning Conference at Purdue.
  • Publication date: 2024/07/17

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