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Principles of evaporator coil design for air source cold climate heat pumps using smaller diameter copper tubes and low GWP refrigerants.

Number: 0191

Author(s) : SHABTAY Y., MOSTOVOY P., SONG J., GAO Y.

Summary

This paper demonstrates that small diameter round copper tubes in heat exchanger coils reduce refrigerant charge, increase efficiency, and decrease the size of cold climate heat pumps (CCHPs), while allowing for quick reverse-flow defrost cycles. Simulations are run on an I-shape coil with two rows of 5 mm tubes for various internal tube surface enhancements (microfins), fin types and fin densities. The two-row coil is also compared with a two-and-a-half-row coil. Simulations are then run for an L-type, 15 kW evaporator with six rows of copper tubes, varying the diameter, tube spacing, fin density and tube circuitry. Results are compared with respect to weight, refrigerant charge and pressure drop. Finally, a prototype L-shape coil with 54 copper tubes in each of four rows (216 tubes total) was built and tested. The capacity of this CCHP evaporator was measured at 15 kW with an R290 mass flow rate of 200 kg/h and airflow rate 10,400 m3/h. The test results compared well with simulations.

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Pages: 10

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Details

  • Original title: Principles of evaporator coil design for air source cold climate heat pumps using smaller diameter copper tubes and low GWP refrigerants.
  • Record ID : 30031382
  • Languages: English
  • Subject: Technology
  • Source: Proceedings of the 26th IIR International Congress of Refrigeration: Paris , France, August 21-25, 2023.
  • Publication date: 2023/08/21
  • DOI: http://dx.doi.org/10.18462/iir.icr.2023.0191

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