Thermodynamic Analysis of Small Scale Organic Rankine Cycle (ORC) System Based on Dry, Wet and Dry/Wet (Hybrid) Cooling Towers Under Six Climatic Zones of India
Saurabh Pathak1,2 and SK Shukla1,2*
1Center for Energy, Resources and Development (CERD), India
2Mechanical Engineering Department, Indian Institute of Technology (BHU), Varanasi, India
*Corresponding Author: SK Shukla, Center for Energy, Resources and Development (CERD) and Mechanical Engineering Department, Indian Institute of Technology (BHU), Varanasi, India.
September 16, 2021; Published: November 25, 2021
This paper presents the thermodynamic analysis of small scale Organic Rankine Cycle under six climatic zones of India namely hot and dry (Jodhpur), hot and humid (Mumbai), moderate (Bangalore), composite (Varanasi), cold and cloudy (Srinagar) and cold and sunny (Leh). The Dry, Wet, and Dry/Wet (Hybrid) cooling towers were selected to predict the power output and thermal efficiency of ORC system. A mathematical model was developed in Engineering Equation Solver (EES) environment to analyze the effect of monthly averaged temperature (Tamb) and Relative humidity (RH) on the expander power and thermal efficiency of the ORC system. The expander output of the Organic Rankine cycle (ORC) was 3 kW and the source temperature was fixed at 100 Numerical investigation finds that with the increase in ambient temperature (Tamb) and relative humidity (RH), the expander power and thermal efficiency of the ORC cycle degrades. Results show that the ORC performance was observed maximum in the cold and sunny zone (Leh). For the RH variation the maximum expander power output and efficiency were 3.722 kW and 9.40% with wet cooling tower. Also, with ambient temperature variation the maximum expander power output and efficiency was 3.83 kW and 9.683% with dry mode. The lowest performance of ORC was in the hot and dry zone (Jodhpur). The maximum expander power and efficiency were 2.775 kW and 6.909% with wet mode for the ambient temperature variation. Further the maximum power and efficiency was 2.805 kW and 6.98% with the wet cooling mode as relative humidity varies. The power output and thermal efficiency varies drastically throughout year for Composite zone (Varanasi).
Keywords: Organic Rankine Cycle; Dry; Wet; Hybrid Cooling Tower; Climate Zone
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