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Experimental and calculated heat transfer of a micro-fin shell and tube evaporator: R513A as drop-in replacement for R134a. 

Number: 2047

Author(s) : CENSI G., PADOVAN A.

Summary

The refrigerant mixture R513A is utilised as mid-term replacement for R134a, due to the similar volumetric capacity and relatively low global warming impact. This work compares the heat transfer performances of R134a and R513A in the same direct expansion shell-and-tube evaporator, with micro-fin copper tubes. lt operates in a vapor compression cycle with the possible insertion of an internal liguid-vapor heat exchanger. The working conditions are typical for air conditioning, with outlet water temperature 7 °C, evaporation temperature from 3 to 5 °C, and condensation temperature around 40 °C. Different data points are taken at different values ofthe compressor capacity, ranging from 25 to 100 %. A software simulation is then presented: based on the finite difference method, it uses diff erent literature models for the thermal and hydraulic parameters of the heat exchanger. The calculation procedure is validated with experimental data, showing that it can be used for a predictive analysis of the evaporator parameters.

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Pages: 8

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Details

  • Original title: Experimental and calculated heat transfer of a micro-fin shell and tube evaporator: R513A as drop-in replacement for R134a. 
  • Record ID : 30028926
  • Languages: English
  • Subject: HFCs alternatives
  • Source: 6th IIR Conference on Thermophysical Properties and Transfer Processes of Refrigerants
  • Publication date: 2021/09/01
  • DOI: http://dx.doi.org/10.18462/iir.TPTPR.2021.2047
  • Document available for consultation in the library of the IIR headquarters only.

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