Design And Analysis Of Counter Flow Heat Exchangers In Hvac Systems

Authors

  • V.Naveen , M.Kedarnath

Abstract

The enhancement of thermal performance of a plate heat exchanger (PHE) with microchannels plays a crucial role, and nanoparticles composition may have significant effects when used as working fluid on their efficiency. In this study, A novel microchannel PHE is proposed in the present study. 13 CFD runs based on Response Surface Methodology(RSM) are utilized in this study to study the e?ect of parameters (nanoparticle concentration and channel width) on the thermal-hydraulic performance of microchannel. Based on the results from RSM, microchannel with 0.45mm width and 0.01% Al2O3 nanofluid showed the best performance and are utilized in the design of novel PHE. The effectiveness, Number of Transfer Units (NTU), and the heat transfer rate with water and Al2O3 – nanofluid as working fluids under different flow rates are evaluated. Effectiveness for PHE with nanofluid showed a maximum of 16.06% increase compared to water as working fluid at 5 kg/h mass flow rate and 54.3% increase in NTU compared to water as working fluid at 5 kg/h mass flow rate. The overall increase in heat transfer rate by 16.06% is observed in the case of nanofluid compared to water as a working fluid at a 5 kg/h mass flow rate.

Published

2020-11-01

Issue

Section

Articles