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Experimental investigations on an adiabatic capillary tube in a transcritical carbon dioxide heat pump system.

Author(s) : AGRAWAL N., BHATTACHARYYA S.

Summary

Capillary tubes in CO2 transcritical heat pump systems give rise to a very different situation compared to subcritical systems due to the low critical temperature of CO2, causing temperature and pressure to be two independent parameters in the supercritical zone unlike in a subcritical cycle. Experimental results for a prototype CO2 heat pump system employing capillary tube as an expansion device for simultaneous water heating and cooling are presented in this study. Tests were conducted with two stainless steel capillary tubes with an ID of 1.71 and 1.42 mm at various operating conditions. Variation of gas cooler pressure was more sensitive and varied significantly with mass flow rate of water and its inlet temperature in gas cooler than that of evaporator. However, the effect of water flow rate on system performance is modest. Capillary tube length and the flow characteristics predicted by the modelling exercises exhibit a reasonably good match with the test results.

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Pages: 2008-2

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Details

  • Original title: Experimental investigations on an adiabatic capillary tube in a transcritical carbon dioxide heat pump system.
  • Record ID : 2009-0817
  • Languages: English
  • Source: 8th IIR-Gustav Lorentzen Conference on Natural Working Fluids (GL2008)
  • Publication date: 2008/09/07

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