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Evaluation of a variable suction gas heat exchanger in a liquid chiller system using carbon dioxide as refrigerant.

Author(s) : REKSTAD H., SAETRANG S., EIKEVIK T., et al.

Summary

A prototype refrigerated seawater (RSW) system using carbon dioxide (CO2) as the refrigerant in a transcritical process has been designed, built and tested experimentally. The system was equipped with a variable capacity suction gas heat exchanger (SGHX) which allowed operation at optimal evaporator refrigerant charge. A simulation program for finding the optimum SGHX capacity at different operating conditions has been developed and used. Steady state experiments were done in both cooling and combined cooling/water heating mode at discharge pressures between 50-90 bar and cooling water temperatures between 10-25°C. Measured cooling capacities at steady state varied between 17-38 kW depending on the ambient cooling water temperature. Highest cooling capacity was measured at 10°C cooling water temperature and 70 bar discharge pressure. The optimum COP was measured at 60-70 bar discharge pressure for cooling water temperatures below 20°C and 80 bar above. In hot water heating mode water temperature of 80°C was achieved without problems but with low efficiency due to a gas cooler not designed for this operation. This work indicate that a variable capacity SGHX concept appears not to be beneficial with cooling water temperatures below 25°C, but could have a potential at higher temperatures. Generally, the prototype CO2 liquid chiller system worked stable and well.

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Pages: 2010-2

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Details

  • Original title: Evaluation of a variable suction gas heat exchanger in a liquid chiller system using carbon dioxide as refrigerant.
  • Record ID : 2010-1849
  • Languages: English
  • Source: 9th IIR-Gustav Lorentzen Conference on Natural Working Fluids (GL2010). Proceedings. Sydney, Australia, April 12-14, 2010.
  • Publication date: 2010/04/12

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