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Study of a Solar Booster Assisted Ejector Refrigeration System With R134a

[+] Author Affiliations
Jorge I. Hernández, Claudio A. Estrada, Roberto Best

UNAM, Temixco, Morelos, México

Rubén J. Dorantes

UAM Azcapotzalco, México D.F., México

Paper No. ISEC2003-44242, pp. 343-350; 8 pages
doi:10.1115/ISEC2003-44242
From:
  • ASME 2003 International Solar Energy Conference
  • Solar Energy
  • Kohala Coast, Hawaii, USA, March 15–18, 2003
  • Conference Sponsors: Solar Energy Division
  • ISBN: 0-7918-3676-2 | eISBN: 0-7918-3664-9
  • Copyright © 2003 by ASME

abstract

A parametric study for a booster assisted ejector refrigeration system in steady state is carried out employing Lu’s ejector model in transition regime. The range of generator and condenser temperatures is considered for a solar powered system. Conceiving the ejector geometry, through the area ratio φ and the main throat area A*, and the system behavior, through the energy efficiency COPs , the exergy efficiency εs and energy ratio Er, it was found that their extreme values, lowest for A* and highest for the remainder, are reached at the highest generator temperature, TGE , and booster discharge pressure, pDIS , with the lowest condenser temperature, TCO , for the considered evaporator temperature, TEV , of −10°C. In regard to the ejector behavior, its maximum efficiency value, ηEJ , is reached for the highest TGE and the lowest TCO for an intermediate pDIS . If TCO is increased, the maximum ηEJ value is achieved at a higher pDIS . In spite of that the maximum ηEJ value is not reached at the highest pDIS , its influence is not reflected in system behavior because U always increases and its maximum value agrees with theory. The most important system and ejector parameters are presented as a reference.

Copyright © 2003 by ASME

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