Annual thermal performance of greenhouse with an earth–air heat exchanger: An experimental validation |
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| Authors: | G.N. Tiwari M.A. Akhtar Ashish Shukla M. Emran Khan |
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| Affiliation: | aCentre for Energy Studies, Indian Institute of Technology Delhi, Hauz Khas, New Delhi-110016, India;bDepartment of Mechanical Engineering, Sant Lngowal Institute of Engineering and Technology, Longowal, Sangrur–148106, India;cDepartment of Mechanical Engineering, Faculty of Engineering and Technology, Jamia Millia Islamia, New Delhi-110025, India |
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| Abstract: | In this paper the thermal model given by Ghoshal and Tiwari has been validated by round-the-year experimental work at IIT Delhi, New Delhi (28° 35′N, 77° 12′E), India. The correlation coefficient and root-mean-square percentage deviation have been computed for each month for validation of the thermal model. The values are 0.99% and 4.24% for the greenhouse temperature with an earth–air heat exchanger (EAHE) in the month of January. Statistical analysis shows that there is fair agreement between predicted and experimental values. An effort has also been made to optimize the working hours of an EAHE to obtain maximum heating/cooling potential. The non-operational hours of an EAHE are 252 and 279 for February and March months, respectively. The maximum value of heating potential (11.55 MJ) and cooling potential (18.87 MJ) has been found during off sunshine (8 pm–8 am) hours and peak sunshine hours (8 am–8 pm), for a typical day in the month of January and June. |
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| Keywords: | Earth– air heat exchanger Heating/cooling potential Thermal load leveling |
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