Title: Energy and entropy generation analysis of hydrological cycle in tropical regions

Authors: Saumyakanta Mishra; Bishnu N. Mahapatra; Sudhansu S. Sahoo; Auroshis Rout; Saroj K. Mishra

Addresses: Department of Mechanical Engineering, College of Engineering and Technology Bhubaneswar, 751003, India ' Department of Mechanical Engineering, College of Engineering and Technology Bhubaneswar, 751003, India ' Department of Mechanical Engineering, College of Engineering and Technology Bhubaneswar, 751003, India ' Department of Energy Science and Engineering, Indian Institute of Technology Bombay, 400076, India ' Centre for Atmospheric Sciences, Indian Institute of Technology Delhi, 110016, India

Abstract: Energy and entropy studies of the processes involved in the hydrologic cycle have been carried out assuming that the cycle mimics the behaviour of an actual Rankine cycle. At a given set of operating conditions, the net work outputs used for atmospheric circulation and the efficiencies are evaluated for both reversible and irreversible cycles. The efficiency shows an inverse relation with the system vapour quality for the irreversible cycle, unlike the reversible one in which it increases up to a certain value and then decreases. The efficiency value is found to vary from 0.028 to 0.068 when the difference in hot and cold temperatures gets varied from 10°C to 40°C. The investigation of the effect of the operating temperatures on the critical vapour quality of the system shows that the critical vapour quality depends almost linearly on the cold operating temperature.

Keywords: hydrological cycle; Rankine cycle; energy analysis; entropy analysis; irreversibilities.

DOI: 10.1504/IJEX.2021.115899

International Journal of Exergy, 2021 Vol.35 No.3, pp.327 - 341

Received: 06 May 2020
Accepted: 01 Nov 2020

Published online: 25 Jun 2021 *

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