surplus thermal energy model of greenhouses and coefficient analysis for effective utilization
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2016
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Abstract
If a greenhouse in the temperate and subtropical regions is maintained in a closed condition, the indoor temperature commonly exceeds that required for optimal plant growth, even in the cold season. This study considered this excess energy as surplus thermal energy (STE), which can be recovered, stored and used when heating is necessary. To use the STE economically and effectively, the amount of STE must be estimated before designing a utilization system. Therefore, this study proposed an STE model using energy balance equations for the three steps of the STE generation process. The coefficients in the model were determined by the results of previous research and experiments using the test greenhouse. The proposed STE model produced monthly errors of 17.9%, 10.4% and 7.4% for December, January and February, respectively. Furthermore, the effects of the coefficients on the model accuracy were revealed by the estimation error assessment and linear regression analysis through fixing dynamic coefficients. A sensitivity analysis of the model coefficients indicated that the coefficients have to be determined carefully. This study also provides effective ways to increase the amount of STE.
| Reference Key |
yang2016spanishsurplus
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| Authors | ;Seung-Hwan Yang;Jung-Eek Son;Sang-Deok Lee;Seong-In Cho;Alireza Ashtiani-Araghi;Joong-Yong Rhee |
| Journal | Canadian Medical Association Journal |
| Year | 2016 |
| DOI |
10.5424/sjar/2016141-7517
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