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RISS 인기검색어
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- 저자 : Tasnim Syeda Humaira (검색결과 1 건)
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Simulation of an Earth-Air Heat Exchanger in a Commercial Greenhouse to Improve Energy Efficiency
Nauta Alex,Tasnim Syeda Humaira,Lubitz William David 한국농업기계학회 2023 바이오시스템공학 Vol.48 No.3
Purpose Greenhouses in colder northern climates typically require significant supplemental heating for year-round operation, usually provided by natural gas combustion. One potential method of reducing greenhouse energy use is to incorporate an earth-air heat exchanger (EAHE) for seasonal heat storage; however, there is little guidance in the literature on the feasibility of this technology in cold-climate greenhouses. Methods This study uses simulations to examine the potential energy savings that could be achieved in cold-climate greenhouses by incorporating an EAHE system. A lumped parameter greenhouse energy model previously developed and tested against experimental data from several commercial and passive greenhouses was modified to simulate the addition of an EAHE in a commercial-scale lettuce greenhouse. The operation and energy use of this greenhouse was simulated at several locations across Canada. Crop evapotranspiration was included in the energy balance, and the greenhouse was assumed to deploy a thermal curtain at night. Results The EAHE sub-model was validated against experimental results available in the literature and was found to accurately predict the outlet air temperature of an EAHE. The predicted change in required supplemental heating with an operating EAHE varied from a 100% reduction in Victoria, BC, to a 13.3% reduction in Winnipeg, Manitoba. Conclusions EAHE use could reduce, or in a few locations with milder winters, even remove the need for supplemental heating at commercial-scale Canadian greenhouses.
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