SciELO - Scientific Electronic Library Online

vol.25 issue4ANN-based evaluation of wind power generation: A case study in Kutahya, TurkeyMapping wind power density for Zimbabwe: a suitable Weibull-parameter calculation method author indexsubject indexarticles search
Home Pagealphabetic serial listing  

Services on Demand



Related links

  • On index processCited by Google
  • On index processSimilars in Google


Journal of Energy in Southern Africa

On-line version ISSN 2413-3051
Print version ISSN 1021-447X


JAIN, Vaibhav; SACHDEVA, Gulshan  and  KACHHWAHA, Surendra S. Performance analysis of a vapour compression-absorption cascaded refrigeration system with undersized evaporator and condenser. J. energy South. Afr. [online]. 2014, vol.25, n.4, pp.23-36. ISSN 2413-3051.

In a present study, the performance of a vapour compression-absorption cascaded refrigeration system (CRS) under fouled conditions was analysed. The main effect of fouling is to decrease the effectiveness of the heat exchanger. Thus, the overall conductance (UA) of the heat exchanger is decreased. Hence, another interpretation of fouling is to reduce the effective size of the heat exchanger. In the present work, the percentage decrease in the overall conductance value (UA) of evaporator and condenser due to their fouling is varied from 0 to 50% and its consequences on various aspects of CRS are generated to ascertain any possible patterns. The detailed first law analysis reveals that for a clean evaporator and condenser, the electricity consumption is 67.5% less than vapour compression system (VCS) for the same cooling capacity. CRS is able to save only 61.3% of electrical energy when evaporator and condenser conductance is reduced by 50% due to fouling. Evaporator and condenser fouling decreased the COP and rational efficiency of the system by 4.7% and 10.5% respectively. It is also important to note that irreversibility in the evaporator and condenser is increased by 42.4% and 62.1% respectively, when their individual performance is degraded by 50% due to fouling.

Keywords : fouling; vapour compression; absorption; cascaded refrigeration system; first law; second law analysis.

        · text in English     · English ( pdf )


Creative Commons License All the contents of this journal, except where otherwise noted, is licensed under a Creative Commons Attribution License