Integrated evaporator–condenser cascaded adsorption system for low temperature cooling using different working pairs

H.J. Dakkama, A. Elsayed, R.K. AL-Dadah, S.M. Mahmoud and P. Youssef

Applied Energy, 2017, vol. 185, issue P2, 2117-2126

Abstract: A cascaded adsorption cooling system with an integrated evaporator/condenser can produce low temperature cooling, using waste heat sources. The choice of the working pair in such a system affects the system’s performance when driven by low temperature waste heat sources, which can be as low as 70°C. This paper investigates the performance of various adsorbent/refrigerant working pairs in a cascaded adsorption system with an integrated evaporator/condenser using Simulink/MATLAB software. The cascaded system consists of two pairs of adsorber beds, a condenser, an evaporator and an integrated condenser/evaporator heat exchanger, forming upper and bottoming cycles. Five combinations of working pairs were investigated: ATO/ethanol+Maxsorb/R507A; Maxsorb/R134a+Maxsorb/propane; ATO/Ethanol+Maxsorb/propane; ATO/ethanol+AC-35/methanol; and Maxsorb/R134a+Maxsorb/R507A. The latter combination was used for validation and as a reference combination for assessing the performance of the investigated working pairs in terms of COP and cooling capacity. The results showed that the Maxsorb/R134a+Maxsorb/propane combination gives a higher COP compared to the reference combination, with up to 30.0% and 30.1% for the COP and cooling capacity, respectively; while ATO/ethanol+AC-35/methanol produces a similar performance to the reference case but uses natural refrigerants with low global warming potential and low cost adsorbent materials.

Keywords: Adsorption; Cascading; Working pairs; Freezing; Simulink (search for similar items in EconPapers)
Date: 2017
References: View references in EconPapers View complete reference list from CitEc
Citations: View citations in EconPapers (4)

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DOI: 10.1016/j.apenergy.2016.01.132

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