Numerical and experimental investigations of diffusion absorption refrigeration systems for use with low temperature heat sources

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Title: Numerical and experimental investigations of diffusion absorption refrigeration systems for use with low temperature heat sources
Authors: Najjaran Kheirabadi, A
Harraz, AA
Freeman, J
Mac Dowell, N
Markides, CN
Item Type: Conference Paper
Abstract: he diffusion absorption refrigeration (DAR) cycle is a technology of increasing interest thanks to its suitab ility for providing cooling from a thermal energy input in a range of applications . It can be distinguished from other absorption refrigeration cycles by its employment of a thermally - driven bubble pump to circulate the working fluid , which gives it an ability to operate entirely off - grid without an electricity input . In this work , we present results from an experimental campaign aimed at characteri s ing the performance of a prototype ammonia - water - hydrogen D AR system with a nominal cooling capacity of 100 W, over a range of operating conditions, specifically with a view of adapt ing the system for use in low - temperature applications. In the experiments, the heat input to the DAR generator is provided over a ra ng e of temperatures from 175 to 215 °C by using electrical cartridge heaters. The system is charged to 22 bar, and the ammonia mass concentration of the working fluid mixture is 30%. The resulting coefficient of performance (COP) of the system is measured in the range 0.12 to 0.26 . A new methodology for the selection of optimal working - fluid mixtures using the state - of - the - art, statistical associating fluid theory (SAFT) approach implemented within the process modelling software gPROMS ® is also presented. The experimental results will be used for future validation of a thermodynamic model of the cycle. Finally, the performance of the system in a solar application is investigated, with a thermal input provided by an array of evacuated tube heat pipe solar collectors. The system pressure and condensation temperature are found to be key factors in determining the performance of solar - DAR system s .
Issue Date: 17-Jun-2018
Date of Acceptance: 4-May-2018
URI: http://hdl.handle.net/10044/1/62182
Publisher: ECOS
Journal / Book Title: ECOS 2018 - 31st International Conference on Efficiency, Cost, Optimization, Simulation and Environmental Impact of Energy Systems
Copyright Statement: © 2018 The Author(s)
Sponsor/Funder: Engineering & Physical Science Research Council (EPSRC)
Engineering & Physical Science Research Council (EPSRC)
Engineering & Physical Science Research Council (EPSRC)
Funder's Grant Number: EP/M025012/1
EP/P004709/1
EP/P030920/1
Conference Name: ECOS 2018 - 31st International Conference on Efficiency, Cost, Optimization, Simulation and Environmental Impact of Energy Systems
Publication Status: Published
Start Date: 2018-06-17
Finish Date: 2018-06-21
Conference Place: Guimarães, Portugal
Appears in Collections:Faculty of Engineering
Centre for Environmental Policy
Chemical Engineering
Faculty of Natural Sciences



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