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On the effectiveness of brazed-type capillary tube suction line heat exchangers running with isobutane.

Number: 2117

Author(s) : BRÜGGEMANN P. A., PODGAIETSKY G. L., PALERMO K., WOHLERS E., JULIUS J., BORTOLETO A., HERMES C. J. L.

Summary

Isobutane flows through brazed-type capillary tube suction line exchangers are investigated both experimentally and numerically. The experimental work was conducted by means of a purpose-built testing facility, where 16 samples comprising of four heat exchanger arrangements considering different heat transfer lengths and positions, and capillary tube and suction line inner diameters ranging from 0.66 to 0.77 mm and 6.6 to 7.9 mm, respectively, were evaluated for two different condensing pressures (3.5 and 7.5 bar). In the numerical front, the mathematical formulation for modeling of non-adiabatic capillary tube flows introduced in a prior study was revisited, and the assumptions adopted for effectiveness calculation were assessed. Comparisons of the model predictions for the refrigerant mass flow rate and the suction line outlet temperature with their experimental counterparts showed errors within ±10% and ±3C bands, respectively. It was found that the liquid-to-vapor counterflow heat exchanger approach for effectiveness calculation led to satisfactory results even in the cases where the heat exchanger is fulfilled with flashing refrigerant.

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  • Original title: On the effectiveness of brazed-type capillary tube suction line heat exchangers running with isobutane.
  • Record ID : 30032982
  • Languages: English
  • Source: 2024 Purdue Conferences. 20th International Refrigeration and Air-Conditioning Conference at Purdue.
  • Publication date: 2024/07/17

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