Title: Energy and exergy analyses of a residential cold thermal energy storage system

Authors: Canan Acar; Ibrahim Dincer

Addresses: Faculty of Engineering and Applied Science, University of Ontario Institute of Technology, 2000 Simcoe Street North, Oshawa, Ontario L1H 7K4, Canada ' Faculty of Engineering and Applied Science, University of Ontario Institute of Technology, 2000 Simcoe Street North, Oshawa, Ontario L1H 7K4, Canada

Abstract: In this study, a practical ice-slurry thermal energy system is considered to meet a building's cooling demands. Hourly system analyses are conducted, including total work and heat loads, rate of exergy destruction, exergy efficiency and COP. The effects of varying ambient conditions on the charging, storage, and discharging periods are also investigated. Exergy destruction and exergy efficiency concepts are studied to consider irreversibilities to address the consequences of non-conservation of exergy. Focusing at different times, cooling demands, and identifying the exergy efficiency and destructions at charging at discharging periods and the system's exergetic performance give an idea about 'the availability of work' lost in different subunits and at different ambient temperatures. The results show that during the peak cooling demand of the residential unit, the rate of exergy destruction is about 64 kW, the exergy efficiency is about 47%, and the highest COP becomes about 2.45, respectively.

Keywords: CTES; cold thermal energy storage; off-peak cooling; energy analysis; exergy analysis; environment; residential energy storage; building cooling; ice-slurry thermal energy; work load; heat load; exergy destruction; exergy efficiency; COP; irreversibilities.

DOI: 10.1504/IJEX.2016.075879

International Journal of Exergy, 2016 Vol.19 No.4, pp.441 - 458

Received: 14 Aug 2014
Accepted: 19 Feb 2015
Published online: 12 Apr 2016 *

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