EVOLUTION OF DESIGN CRITERIA FOR EARTH AIR -PIPE COOLING SYSTEM OF GREENHOUSE

D. SINGH¹, A.K. SINGH², S. POONIA³*
¹School of Energy and Environmental Studies, Devi Ahilya Vishwavidyalaya, Indore, 452 001, Madhya Pradesh, India
²ICAR-Central Arid Zone and Research Institute, Jodhpur, 342 003, Rajasthan, India
³ICAR-Central Arid Zone and Research Institute, Jodhpur, 342 003, Rajasthan, India
* Corresponding Author : poonia.surendra@gmail.com

Received : 03-12-2020     Accepted : 26-12-2020     Published : 30-12-2020
Volume : 12     Issue : 24       Pages : 10517 - 10519
Int J Agr Sci 12.24 (2020):10517-10519

Keywords : Air-pipe cooling, Optimization, Maximum heat removal, Climatic factor, Environmental factor
Academic Editor : Dr Vipul N Kapadia, S. M. Chavan, Dr N Umashankar Kumar
Conflict of Interest : None declared
Acknowledgements/Funding : Authors are thankful to ICAR-Central Arid Zone and Research Institute, Jodhpur, 342 003, Rajasthan, India
Author Contribution : All authors equally contributed

A mathematical model has been developed to evolve criteria for optimally designing an earth air–pipe cooling system employed in greenhouses. Relations have also been developed to compute the size of earth air pipe cooling system required for the space to be cooled. This cooling system is characterized by two parameters i.e. pipe length and cross-section and volumetric air flow rate (m3s-1m-2 floor area). These two parameters have been optimized to remove the maximum heat flux from the greenhouse enclosure. For a given environmental parameter ? (? = (Tr-Ts)/(Ta-Ts)), the optimum air flow rate (m3s-1m-2 floor area) cab be computed. A polynomial relation between environmental factor (?) and climatic factor (CF) was given. For creating a desirable temperature inside greenhouse the value of ? is decided and then CF is calculated. The ratio A/At has been related to ? and CF. For a given value of flow velocity (vt), we can determine the cross-sectional area of pipe in m2. This model has proved to be very useful in designing the optimal cross-sectional area of pipe and optimal volumetric air flow rate for removing the maximum heat load from the greenhouse

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