Thermal analysis and performance optimization of a solar hot water plant with economic evaluation

Handle URI:
http://hdl.handle.net/10754/562165
Title:
Thermal analysis and performance optimization of a solar hot water plant with economic evaluation
Authors:
Kim, Youngdeuk; Thu, Kyaw; Bhatia, Hitasha Kaur; Bhatia, Charanjit Singh; Ng, K. C.
Abstract:
The main objective of this study is to optimize the long-term performance of an existing active-indirect solar hot water plant (SHWP), which supplies hot water at 65 °C for use in a flight kitchen, using a micro genetic algorithm in conjunction with a relatively detailed model of each component in the plant and solar radiation model based on the measured data. The performance of SHWP at Changi International Airport Services (CIASs), Singapore, is studied for better payback period using the monthly average hourly diffuse and beam radiations and ambient temperature data. The data input for solar radiation model is obtained from the Singapore Meteorological Service (SMS), and these data have been compared with long-term average data of NASA (surface meteorology and solar energy or SSE). The comparison shows a good agreement between the predicted and measured hourly-averaged, horizontal global radiation. The SHWP at CIAS, which comprises 1200m 2 of evacuated-tube collectors, 50m 3 water storage tanks and a gas-fired auxiliary boiler, is first analyzed using a baseline configuration, i.e., (i) the local solar insolation input, (ii) a coolant flow rate through the headers of collector based on ASHRAE standards, (iii) a thermal load demand pattern amounting to 100m 3/day, and (iv) the augmentation of water temperature by auxiliary when the supply temperature from solar tank drops below the set point. A comparison between the baseline configuration and the measured performance of CIAS plant gives reasonably good validation of the simulation code. Optimization is further carried out for the following parameters, namely; (i) total collector area of the plant, (ii) storage volume, and (iii) three daily thermal demands. These studies are performed for both the CIAS plant and a slightly modified plant where the hot water supply to the load is adjusted constant at times when the water temperature from tank may exceed the set temperature. It is found that the latter configuration has better thermal and economic performances over the conventional design. © 2012.
KAUST Department:
Water Desalination and Reuse Research Center (WDRC); Water Desalination & Reuse Research Cntr
Publisher:
Elsevier BV
Journal:
Solar Energy
Issue Date:
May-2012
DOI:
10.1016/j.solener.2012.01.030
Type:
Article
ISSN:
0038092X
Sponsors:
The authors gratefully acknowledge the financial support given by Grants (2008EWT-CERP002-032) from NRF, Singapore and (R265-000-286-597) from King Abdullah University of Science and Technology (KAUST).
Appears in Collections:
Articles; Water Desalination and Reuse Research Center (WDRC)

Full metadata record

DC FieldValue Language
dc.contributor.authorKim, Youngdeuken
dc.contributor.authorThu, Kyawen
dc.contributor.authorBhatia, Hitasha Kauren
dc.contributor.authorBhatia, Charanjit Singhen
dc.contributor.authorNg, K. C.en
dc.date.accessioned2015-08-03T09:46:17Zen
dc.date.available2015-08-03T09:46:17Zen
dc.date.issued2012-05en
dc.identifier.issn0038092Xen
dc.identifier.doi10.1016/j.solener.2012.01.030en
dc.identifier.urihttp://hdl.handle.net/10754/562165en
dc.description.abstractThe main objective of this study is to optimize the long-term performance of an existing active-indirect solar hot water plant (SHWP), which supplies hot water at 65 °C for use in a flight kitchen, using a micro genetic algorithm in conjunction with a relatively detailed model of each component in the plant and solar radiation model based on the measured data. The performance of SHWP at Changi International Airport Services (CIASs), Singapore, is studied for better payback period using the monthly average hourly diffuse and beam radiations and ambient temperature data. The data input for solar radiation model is obtained from the Singapore Meteorological Service (SMS), and these data have been compared with long-term average data of NASA (surface meteorology and solar energy or SSE). The comparison shows a good agreement between the predicted and measured hourly-averaged, horizontal global radiation. The SHWP at CIAS, which comprises 1200m 2 of evacuated-tube collectors, 50m 3 water storage tanks and a gas-fired auxiliary boiler, is first analyzed using a baseline configuration, i.e., (i) the local solar insolation input, (ii) a coolant flow rate through the headers of collector based on ASHRAE standards, (iii) a thermal load demand pattern amounting to 100m 3/day, and (iv) the augmentation of water temperature by auxiliary when the supply temperature from solar tank drops below the set point. A comparison between the baseline configuration and the measured performance of CIAS plant gives reasonably good validation of the simulation code. Optimization is further carried out for the following parameters, namely; (i) total collector area of the plant, (ii) storage volume, and (iii) three daily thermal demands. These studies are performed for both the CIAS plant and a slightly modified plant where the hot water supply to the load is adjusted constant at times when the water temperature from tank may exceed the set temperature. It is found that the latter configuration has better thermal and economic performances over the conventional design. © 2012.en
dc.description.sponsorshipThe authors gratefully acknowledge the financial support given by Grants (2008EWT-CERP002-032) from NRF, Singapore and (R265-000-286-597) from King Abdullah University of Science and Technology (KAUST).en
dc.publisherElsevier BVen
dc.subjectEconomic evaluationen
dc.subjectOptimizationen
dc.subjectSolar hot water planten
dc.subjectSolar radiation analysisen
dc.titleThermal analysis and performance optimization of a solar hot water plant with economic evaluationen
dc.typeArticleen
dc.contributor.departmentWater Desalination and Reuse Research Center (WDRC)en
dc.contributor.departmentWater Desalination & Reuse Research Cntren
dc.identifier.journalSolar Energyen
dc.contributor.institutionDepartment of Mechanical Engineering, National University of Singapore, 9 Engineering Drive 1, Singapore 117576, Singaporeen
dc.contributor.institutionDepartment of Electrical and Computer Engineering, National University of Singapore, 9 Engineering Drive 1, Singapore 117576, Singaporeen
kaust.authorKim, Youngdeuken
kaust.authorThu, Kyawen
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