Evaluation of adding flash tank to solar combined ejector-absorption refrigeration system

Ranj Sirwan, M. A. Alghoul, Kamaruzzaman Sopian, Yusoff Ali, Jasim Abdulateef

Research output: Contribution to journalArticle

27 Citations (Scopus)

Abstract

Performance of the absorption cooling system is still a challenge due to the coefficient of performance (COP) that is generally poor when compared with the conventional vapor compression cycle. High solar radiation in hot climates is usually associated with high ambient temperature and consequently peak cooling demand. Absorption cooling cycles can be powered by solar but the performance is limited by heat source temperature (solar collector) and high ambient temperature that can affect the condensation process. Efficiency enhancement of the system components is essential to increase the COP of the system. A modification in the combined absorption-ejector cooling system is adopted. Adding a removable flash tank between the condenser and evaporator could improve entrainment ratio of the ejector, along with improving the cooling effect inside the evaporator. A computer simulation program is developed to evaluate the performance of the modified combined cycle using aqua-ammonia (NH3-H2O) refrigerant. The performance of the proposed combined cooling cycle is compared with basic absorption, and combined absorption-ejector cooling cycles. Results showed a significant improvement in the COP of the modified cycle at different operating conditions. Cooling effect and capacity of the evaporator is enhanced due to the reduction of flash gas delivered to the evaporator. Furthermore, the flash tank optimized the ejector entertainment ratio and consequently increasing the condenser pressure. This optimization will enable the system to perform well in hot climates where the condenser efficiency is limited by ambient temperature.

Original languageEnglish
Pages (from-to)283-296
Number of pages14
JournalSolar Energy
Volume91
DOIs
Publication statusPublished - May 2013

Fingerprint

Absorption refrigeration
Evaporators
Cooling
Absorption cooling
Cooling systems
Temperature
Solar collectors
Refrigerants
Solar radiation
Ammonia
Condensation
Gases
Vapors
Computer simulation

Keywords

  • Adding flash tank
  • Combined absorption-ejector cycle
  • Enhancement of components efficiency
  • Mathematical performance of the modified cycle

ASJC Scopus subject areas

  • Renewable Energy, Sustainability and the Environment
  • Materials Science(all)

Cite this

Evaluation of adding flash tank to solar combined ejector-absorption refrigeration system. / Sirwan, Ranj; Alghoul, M. A.; Sopian, Kamaruzzaman; Ali, Yusoff; Abdulateef, Jasim.

In: Solar Energy, Vol. 91, 05.2013, p. 283-296.

Research output: Contribution to journalArticle

Sirwan, Ranj ; Alghoul, M. A. ; Sopian, Kamaruzzaman ; Ali, Yusoff ; Abdulateef, Jasim. / Evaluation of adding flash tank to solar combined ejector-absorption refrigeration system. In: Solar Energy. 2013 ; Vol. 91. pp. 283-296.
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