Abstract
Solar thermal systems are a long-standing technology that is receiving increased attention, in terms of research and development, due to ambitious climate change targets and the need for renewable energy solutions. Integrated collector-storage solar water heaters (ICSSWHs) are a potential contributing solution and numerous studies have focussed on the optimisation of their thermal performance and efficiency. A major drawback of these systems is the heavy heat losses experienced during non-collection periods. To combat this, various heat retention strategies have been proposed and evaluated, including baffles plates, additional insulation, multiple glazing layers, selective coatings, and phase change materials. This paper aims to bring together these studies through a systematic review of the existing literature surrounding the performance of ICSSWH systems, focusing on heat retention. This review provides a comprehensive and up-to-date point of reference on relevant research and developments for researchers in this field.
Highlights
The current global situation sees ever increasing fossil fuel use with a subsequent increase in climate impact
The aim of this paper is to present an up-to-date, comprehensive review of the current research pertaining to the improvement in thermal performance and heat retention with a particular focus on Integrated collector-storage solar water heaters (ICSSWHs) systems
ICSSWH systems have a number of benefits over other solar thermal systems, namely that they do not require an additional water storage tank, are simple to construct and install and with fewer associated costs
Summary
The current global situation sees ever increasing fossil fuel use with a subsequent increase in climate impact. In Scotland the consumption of heat accounts for 53% of the energy consumed by homes and businesses and the nature of the Scottish climate requires a large proportion of this demand to be dedicated to space and water heating. Domestic hot water use is the second most significant energy use in the home at approximately 13% of total Scottish heat energy demand [3]. Solar hot water systems present a promising alternative to fossil fuel powered heating. Given the high specific heat capacity of water there is great potential for energy gain and storage in these systems, often yielding efficiencies of up to 70% [4]. (SWHs) has has been been an an impressive impressive journey journey beginning beginning in in The. America with with the the first first of of its its kind, kind, ‘The ‘The Climax. Interest interestin insolar solarwater waterheating heating has has been been revived revived in in response response to to global global initiatives initiatives
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