Experimental Study &amp;amp; Heat Transfer Analysis on Copper Spiral Heat Exchanger Using Water Based SiO&amp;lt;sub&amp;gt;2&amp;lt;/sub&amp;gt; Nanofluid as Coolant

Suman Shah,K Kiran Kumar

doi:10.4236/wjnse.2018.84004

Abstract

Heat exchangers have its major application in automobile, air condition, refrigerator, power plants, and many others. Heat transfer characteristics and performance of Copper spiral heat exchanger are investigated and compared with pure water. Nanofluid can enhance thermos-physical properties. Experiment is carried out for water based SiO2 Nanofluid with 15 nm average sized nanoparticle at varying air velocity and mass flow rate of fluid to investigate its effect on heat transfer coefficient. From the experimental data, a closed form solution for Nusselt number has been calculated using ∈-NTU method. A new correlation has been proposed as a function of Reynolds number and Prandtl number. The heat transfer rate, effectiveness, has been significantly higher compared to pure water and with increasing volume fraction of nanoparticles.

Highlights

Radiators are used for transferring heat or thermal energy for cooling in case of automobile engine and heating in case of refrigerators and air conditions
It can be observed that as the concentration of nanoparticles in Nanofluid increases to 0.4% the outlet temperature decreases for constant volume flow rate of fluid up to 6.5 ̊C for the reason being, as the concentration increases, thermal conductivity of fluid increases and the heat transfer rate
From the experimental observation conclusion that can be drawn are: maximum heat transfer occurs at 0.4% volume concentration and 100 cc/s volume flow rate of Nanofluid at 6.5 m/s air velocity

Summary

Introduction

Radiators are used for transferring heat or thermal energy for cooling in case of automobile engine and heating in case of refrigerators and air conditions. Several configurations have been developed for heat exchangers or radiators to maximize the heat transfer rates and utilize the available space effectively [1]. Spiral heat exchangers are compact and have better heat transfer efficiency. The spiral profile helps in effective use of airflow area over it and the boundary layer formed over it is consistent. The heat transfer rate of water based Nanofluid increases, which increases the efficiency and effectiveness of the cooling system [4]

Methods

Results

Conclusion