Heating and Cooling System for Utilization of Surplus Air Thermal Energy in Greenhouse and its Control Logic

Purpose: Utilizing air thermal energy during over-heated time in the greenhouse is a necessary component to save greenhouse heating costs for nighttime. However, there is no practical way to implement the related principles. Methods: In this study, a heating and cooling system which utilizes the sur...

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Bibliographic Details
Published in:Journal of biosystems engineering 2012-02, Vol.37 (1), p.19
Main Authors: Seung Hwan Yang, Chun Gu Lee, Won Kyu Lee, Alireza Araghi Ashtiani, Joon Yong Kim, Sang Deok Lee, Joong Yong Rhee
Format: Article
Language:Korean
Subjects:
Energy recovery
Energy saving
Greenhouse environmental control
Heat pump
Surplus heat
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Summary:Purpose: Utilizing air thermal energy during over-heated time in the greenhouse is a necessary component to save greenhouse heating costs for nighttime. However, there is no practical way to implement the related principles. Methods: In this study, a heating and cooling system which utilizes the surplus air thermal energy in a greenhouse was developed. Available air thermal energy and heating load for this experimental glasshouse were estimated based on temperature conditions of the plant growth and weather data. Results: Estimated values were 400 MJ/day for maximum surplus air thermal energy and 340 MJ/day for maximum heating energy which were target values of the design as well. The system consists of a heat pump, fan-coil units and heat storage tanks which are divided into low and high temperature tanks. Moreover, a new control logic was developed for surplus air thermal energy utilization. Conclusions: This paper explains the details of conceptual design process of the system. Results of test operations showed that the developed system performed the recovery and supply of the thermal energy according to design purposes.
ISSN:1738-1266