Abstract
The present study investigates the heat transfer rate and effectiveness of cross flow heat exchanger by varying velocity and mass flow rate of the cold and hot fluids.The velocity of the cold fluid i.e. air varying from 15m/s to 30m/s(with an intermediate step of 20m/s and 25m/s) whereas the mass flow rate of hot fluid i.e. water is taken as 35lit/hr and 84lit/hr. The logarithmic mean temperature difference (LMTD) method is used to find the heat transfer rate. In thepresent workthe effectiveness and heat transfer rate werecompared between the single and series cross flow heat exchangers. The result shows an average increase of 47.14% and 59.59% of heat transfer rate analogous to mass flow rate of 84lit/hrand 35lit/hr
Highlights
A cross flow heat exchanger is one in which two fluids moves in perpendicular to each other
A.S Krishnan, et al [8] comparedconventional staggered flowand double cross flow heat exchangerbetween heat transfer rate and pressure drop at same conditions for the two configurations.This study reveals that the proposed configuration gives a maximum increase of 27% in heat transfer rate per unit pressure drop.Lubencabezsgomez,et al [9] studied thermal performance of multipass parallel cross flow and counter cross flow heat exchangers
Because mass flow rate of air, Reynolds number increased when increases the velocity of air
Summary
A cross flow heat exchanger is one in which two fluids moves in perpendicular to each other. Cross flow heat exchangers are generally used for heat transfer between gas and liquid for both cooling and heating applications. Mahmoud Khaled, et al [1] determined the overall heat transfer coefficient of a cross flow heat exchanger and found an average relative error of 5% were observed. Khitam Fuaad Aefan, et al [2] experimentally studied LMTD was selected to determine the heat transfer rate, over all heat transfer coefficient and effectiveness. Chad Randall Harris [5] Studied cross flow micro heat exchanger designed to maximize heat transfer from liquid(water) to gas(air).The cross-flow micro heat exchanger produces a very high heat transfer rate per volume between dissimilar fluids with low fluid pressure drop.
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