Cristin-resultat-ID: 348715
Sist endret: 21. januar 2015, 15:27
NVI-rapporteringsår: 2010
Resultat
Vitenskapelig artikkel
2010

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

Bidragsytere:
  • Inge Håvard Rekstad
  • Trygve Magne Eikevik
  • Sondre Sætrang og
  • Yves Ladam

Tidsskrift

Science et technique du froid
ISSN 0151-1637
NVI-nivå 1

Om resultatet

Vitenskapelig artikkel
Publiseringsår: 2010

Beskrivelse Beskrivelse

Tittel

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

Sammendrag

A prototype refrigerated seawater (RSW) system using carbon dioxide (CO2) as the refrigerant in a transcritcal 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 coefficient of performance (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.

Bidragsytere

Inge Håvard Rekstad

  • Tilknyttet:
    Forfatter
    ved Institutt for energi- og prosessteknikk ved Norges teknisk-naturvitenskapelige universitet
Aktiv cristin-person

Trygve Magne Eikevik

  • Tilknyttet:
    Forfatter
    ved Institutt for energi- og prosessteknikk ved Norges teknisk-naturvitenskapelige universitet

Sondre Sætrang

  • Tilknyttet:
    Forfatter

Yves Ladam

  • Tilknyttet:
    Forfatter
    ved SINTEF Energi AS
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