Hybrid Solid Sorption System

Applied Thermal Engineering 62 (2014) 560e565

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Applied Thermal Engineering

journal homepage: www.elsevier.com/locate/apthermeng

Performance of hybrid refrigeration system using ammonia

G. Lychnos*, Z. Tamainot-Telto

School of Engineering, University of Warwick, Coventry CV4 7AL, UK

h i g h l i g h t s

 A mechanical compressor was combined with up to 5 pair bed adsorption generator.  The hybrid’s refrigerating capacity ranges between 4 kW and 24 kW.  The driving temperature varies from 100  C to 250  C.  The driving temperature rises significantly at small number of adsorbent beds.  The system preformed best at low driving temperatures with a 5 pair adsorbent bed.

a r t i c l e i n f o

Article history: Received 7 May 2013 Accepted 12 October 2013 Available online 21 October 2013 Keywords: Adsorption Vapour compression Ammonia Hybrid refrigeration COP

a b s t r a c t

This paper investigates the performance of a hybrid refrigeration system that combines sorptioneconventional vapour compression refrigeration machine driven by dual source (heat and/or electricity). The dual source makes the system highly flexible and energy efficient. The ammonia refrigerant (R717) is used in both adsorption and associated conventional refrigeration cycles. The model of thermal compressor corresponds to a multiple pair of compact adsorption generators operating out of phase with both heat and mass recovery for continuous cooling production and better efficiency. Each generator is based on a plate heat exchanger concept using the activated carboneammonia pair. The model of conventional vapour compressor is a reciprocating compressor from Frigopol. The hybrid refrigeration performances are presented mainly for ice making and air conditioning applications (TC ¼ 40  C, À5  C < TE < 20  C). The exhaust temperature of the compressor (driving temperature for thermal compressor) varies from 90  C to 250  C. The results...