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Diffusion-absorption refrigeration cycle simulations in gPROMS using SAFT-γ Mie

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Title: Diffusion-absorption refrigeration cycle simulations in gPROMS using SAFT-γ Mie
Authors: Harraz, AA
Freeman, J
Wang, K
Mac Dowell, N
Markides, CN
Item Type: Journal Article
Abstract: Diffusion-absorption refrigeration (DAR) is a clean thermally-powered refrigeration technology that can readily be activated by low- to medium-grade renewable heat. There is an ongoing interest in identifying or designing new working fluids for performance improvement, particularly in solar applications with non-concentrating solar collectors providing heat at temperatures < 150 °C. In this work, the state-of-the-art statistical associating fluid theory (SAFT) is adopted for predicting the thermodynamic properties of suitable DAR working fluids. A first-law thermodynamic analysis is performed in the software environment gPROMS for a DAR cycle using ammonia as the refrigerant, water as the absorbent and hydrogen as the auxiliary gas. The simulation results show good agreement with experimental data generated in a prototype DAR system with a nominal cooling capacity of 100 W. In particular, at a charge pressure of 17 bar and when delivering cooling at 5 °C, the model results agree with experimental COP data to within ± 7 % over a range of heat inputs from 150 to 500 W. The maximum coefficient of performance (COP) is estimated to be 0.24 at a heat input of 250 W. The group-contribution SAFT-γ Mie equation of state is of particular interest as it offers good agreement with experimental data and provides flexibility in extending the model to test different working fluids with a high degree of fidelity. A methodology is also presented that allows the DAR thermodynamic analysis and working-fluid modelling to be integrated into a more general technology optimisation framework.
Issue Date: 1-Feb-2019
Date of Acceptance: 17-Jun-2018
URI: http://hdl.handle.net/10044/1/62203
DOI: https://dx.doi.org/10.1016/j.egypro.2019.01.284
ISSN: 1876-6102
Publisher: Elsevier
Start Page: 2360
End Page: 2365
Journal / Book Title: Energy Procedia
Volume: 158
Copyright Statement: © 2019 The Authors. Published by Elsevier Ltd. This is an open access article under the CC BY-NC-ND license (http://creativecommons.org/licenses/by-nc-nd/4.0/)
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
Publication Status: Published
Conference Place: Hong Kong, China
Open Access location: https://doi.org/10.1016/j.egypro.2019.01.284
Online Publication Date: 2019-03-15
Appears in Collections:Faculty of Engineering
Centre for Environmental Policy
Chemical Engineering
Faculty of Natural Sciences