Title: Exergetic analysis of plate evaporator using hybrid nanofluids as secondary refrigerant for low-temperature applications

Authors: Atul Bhattad; Jahar Sarkar; Pradyumna Ghosh

Addresses: Department of Mechanical Engineering, Indian Institute of Technology (BHU), Varanasi 221005, India ' Department of Mechanical Engineering, Indian Institute of Technology (BHU), Varanasi 221005, India ' Department of Mechanical Engineering, Indian Institute of Technology (BHU), Varanasi 221005, India

Abstract: The brine-based hybrid nanofluids are proposed as a secondary refrigerant in counter-flow corrugated plate evaporator for low-temperature applications. Different types of alumina hybrid nanofluids containing different nanoparticles (copper, silver and multi-walled carbon nanotube) in equal volume with the total volume concentration of 0.8% dispersed in different brines have been assessed for certain cooling load. Various exergetic performance parameters-based comparison has been performed with brines and related hybrid nanofluids for milk chilling, ice making and fish freezing applications. Some energy-exergy relationships have been established as well. Exergetic performance decreases with a decrease in application temperature. The maximum reduction in irreversibility and non-dimensional exergy destruction, and maximum increase in irreversibility distribution ratio (IDR) and exergetic efficiency have been obtained for propylene glycol brine-based alumina multi-walled carbon nanotube hybrid nanofluid. The study reveals that the brine-based hybrid nanofluids may be the suitable substitute as a secondary refrigerant.

Keywords: hybrid nanofluid; PHE; plate heat exchanger; secondary refrigerant; brine; irreversibility; exergetic efficiency.

DOI: 10.1504/IJEX.2017.086857

International Journal of Exergy, 2017 Vol.24 No.1, pp.1 - 20

Received: 22 Feb 2017
Accepted: 15 Jun 2017
Published online: 01 Oct 2017 *

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