Title: Exergy analysis of plate heat exchanger with graphene alumina hybrid nanofluid: experimentation
Authors: Atul Bhattad
Addresses: Department of Mechanical Engineering, Koneru Lakshmaiah Education Foundation, Vaddeswaram, AP, India; Department of Mechanical Engineering, Indian Institute of Technology (BHU) Varanasi, 221005, India
Abstract: The water-based hybrid nanofluid is proposed as a cooling agent in a corrugated counter-flow type plate heat exchanger aimed at sub-ambient temperature applications. For this purpose, an experimental investigation has been done with different working fluids. Fluids considered as a coolant are DI water, alumina nanofluid, and alumina-graphene hybrid nanofluid in 80:20 nanoparticle ratio by volume with a total volume concentration of 0.01% dispersed in DI water. Various exergy related performance factors like coolant outlet temperature, coolant exergy rate, irreversibility rate, non-dimensional exergy, and second law efficiency have been considered. The influence of coolant inlet temperature and flow rate on different parameters has been investigated. Coolant outlet temperature, coolant exergy rate, irreversibility rate and non-dimensional exergy augments by 2.5%, 4.8%, 7.5% and 3.5%, respectively. While the second law efficiency degrades using nanoparticles and increasing flow rate and decreases with the coolant inlet temperature.
Keywords: hybrid nanofluid; plate heat exchanger; PHE; graphene; non-dimensional exergy; NDE; irreversibility; second law efficiency.
International Journal of Exergy, 2020 Vol.33 No.3, pp.254 - 262
Received: 12 Mar 2020
Accepted: 17 Apr 2020
Published online: 12 Oct 2020 *