Potential application of solar thermal systems for hot water production in Hong Kong |
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| Affiliation: | 1. Department of Architecture, via S. Sofia 64, Catania, 95123, Italy;2. Department of Industrial Engineering, via S. Sofia 64, Catania, 95123, Italy;1. Department of Electrical and Electronics Engineering, National Institute of Technology Nagaland, Dimapur, Nagaland, India;2. Department of Electrical Engineering, National Institute of Technology Silchar, Assam, India;1. School of Engineering, Griffith University, Gold Coast Campus, Parklands Drive, Southport, Queensland 4222, Australia;2. Smart Water Research Centre and School of Engineering, Griffith University, Gold Coast Campus, Queensland 4222, Australia;1. Renewable Energy Research Group (RERG), Department of Building Services Engineering, The Hong Kong Polytechnic University, Hong Kong, China;2. College of Civil Engineering, Hunan University, Changsha 410082, Hunan, China;1. Clean Energy Processes (CEP) Laboratory, Department of Chemical Engineering, Imperial College London, London SW7 2AZ, United Kingdom;2. Centre of Research for Energy Resources and Consumption (CIRCE), University of Zaragoza, Mariano Esquillor 15, 50018 Zaragoza, Spain |
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| Abstract: | This paper presents the evaluation results of conventional solar water heater (SWH) systems and solar assisted heat pump (SAHP) systems for hot water production in Hong Kong. An economic comparison and global warming impact analysis are conducted among the two kinds of solar thermal systems and traditional water heating systems (i.e. electric water heaters and towngas water heaters). The economic comparison results show that solar thermal systems have greater economic benefits than traditional water heating systems. In addition, conventional SWH systems are comparable with the SAHP systems when solar fractions are above 50%. Besides, analysis on the sensitivity of the total equivalent warming impact (TEWI) indicates that the towngas boosted SWH system has the greatest potential in greenhouse gas emission reduction with various solar collector areas and the electricity boosted SWH system has the comparative TEWI with the SAHP systems if its solar fraction is above 50%. As for SAHP systems, the solar assisted air source heat pump (SA-ASHP) system has the least global warming impact. Based on all investigation results, suggestions are given on the selection of solar thermal systems for applications in Hong Kong. |
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