Comparison of the Efficiency of Two Types of Heat Exchangers with Parallel Plates Made of Varied Materials

The paper discusses two mathematical models for the air flow through a plate heat exchanger with parallel plates. The first exhausts the used air and then supplies the fresh air. The second exhausts the used air above the plate and simultaneously supplies fresh air under it (counter-flow exchanger). In both cases, the exhaust air heat is used to heat the supply air. The purpose of the research is to verify which exchanger uses the exhaust air heat more efficiently. The method of the Trefftz function was used to determine approximate solutions of the analysed problems. The results obtained for 1.2 mm thick steel, aluminium, and copper plates and for external winter, summer, and spring–autumn temperatures are discussed. The results indicate that steel is the best material for a plate heat exchanger, and the counter-flow exchanger is more efficient of the two. Thanks to the use of thin steel plates and the reduction of the air exchange time to a few minutes, cheap and efficient counter-flow exchangers can be obtained.

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Heat transfer enhancement in a counter-flow sinusoidal parallel-plate heat exchanger partially filled with porous media using metal foam in the channels’ divergent sections

Journal of Thermal Analysis and Calorimetry ◽

10.1007/s10973-019-08870-w ◽

2019 ◽

Vol 141 (5) ◽

pp. 1669-1685 ◽

Cited By ~ 10

Author(s):

Hossein Arasteh ◽

Ramin Mashayekhi ◽

Milad Ghaneifar ◽

Davood Toghraie ◽

Masoud Afrand

Keyword(s):

Heat Transfer ◽

Porous Media ◽

Heat Exchanger ◽

Heat Transfer Enhancement ◽

Parallel Plate ◽

Metal Foam ◽

Plate Heat Exchanger ◽

Transfer Enhancement ◽

Counter Flow ◽

Plate Heat

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Study Regarding Numerical Simulation of Counter Flow Plate Heat Exchanger

Numerical Analysis - Theory and Application ◽

10.5772/24113 ◽

2011 ◽

Author(s):

Grigore Roxana ◽

Popa Sorin ◽

Hazi Aneta ◽

Hazi Gheorghe

Keyword(s):

Numerical Simulation ◽

Heat Exchanger ◽

Plate Heat Exchanger ◽

Counter Flow ◽

Plate Heat

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Investigation of heat transfer and pressure drop of a counter flow corrugated plate heat exchanger using MWCNT based nanofluids

International Communications in Heat and Mass Transfer ◽

10.1016/j.icheatmasstransfer.2015.05.002 ◽

2015 ◽

Vol 66 ◽

pp. 172-179 ◽

Cited By ~ 114

Author(s):

Marjan Goodarzi ◽

Ahmad Amiri ◽

Mohammad Shahab Goodarzi ◽

Mohammad Reza Safaei ◽

Arash Karimipour ◽

...

Keyword(s):

Heat Transfer ◽

Heat Exchanger ◽

Pressure Drop ◽

Plate Heat Exchanger ◽

Counter Flow ◽

Plate Heat

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Visualization of FC-72 Flow Boiling in Parallel- and Counter-Flow Plate Heat Exchangers

Volume 8A: Heat Transfer and Thermal Engineering ◽

10.1115/imece2014-36689 ◽

2014 ◽

Author(s):

Kohei Koyama ◽

Yuya Nakamura ◽

Hirofumi Arima

Keyword(s):

Heat Transfer ◽

Heat Exchanger ◽

Flow Pattern ◽

Void Fraction ◽

Flow Boiling ◽

Plate Heat Exchanger ◽

Parallel Flow ◽

Working Fluid ◽

Counter Flow ◽

Plate Heat

This study investigates FC-72 (Perfluorohexane) flow boiling in a plate heat exchanger. A plate heat exchanger which has a transparent cover plate is manufactured to visualize boiling two-phase flow pattern of the working fluid FC-72 heated by hot water. Titanium is used for heat transfer plate, which has micro pin-fin structure on the heat transfer surface to enhance heat transfer. Experiment is conducted for parallel- and counter-flow arrangements to compare thermal and hydraulic performances. Flow boiling is photographed by a digital camera and instantaneous images are processed to classify flow pattern and to measure void fraction in the heat exchanger. Flow rates and temperatures of FC-72 and hot water at inlet and outlet of the heat exchanger are simultaneously measured to obtain overall heat transfer coefficient. Two-phase flow pattern of FC-72 flow boiling and void fraction along flow direction as well as thermal performance are discussed. Experimental results show that bubbly flow, slug flow, and churn flow are observed for the experimental range of this study. Extent of churn flow in the parallel-flow heat exchanger is larger than that of the counter-flow one due to generated bubbles at upstream region in working fluid channel. Void fraction of the parallel-flow plate heat exchanger increases rapidly compared with that of the counter-flow one due to location of onset of nucleate boiling. Overall heat transfer coefficients for the parallel-flow arrangement is larger than that of the counter-flow due to destruction of thermal boundary layer. The experimental results show that flow arrangement of a plate heat exchanger has the potential to improve its thermal performance.

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A New Approach to Numerical Simulation of Small Sized Plate Heat Exchangers With Chevron Plates

Journal of Heat Transfer ◽

10.1115/1.2430722 ◽

2006 ◽

Vol 129 (3) ◽

pp. 291-297 ◽

Cited By ~ 42

Author(s):

Sanjeev Jain ◽

Aniruddha Joshi ◽

P. K. Bansal

Keyword(s):

Heat Transfer ◽

Heat Exchanger ◽

Plate Heat Exchanger ◽

Working Fluid ◽

Computational Domain ◽

Counter Flow ◽

Number Range ◽

New Approach ◽

Plate Heat ◽

Thermal Boundary Conditions

A numerical and experimental study of heat transfer and fluid flow in a single pass counter flow plate heat exchanger with chevron plates has been presented in this paper. CFD analysis of small sized plate heat exchanger was carried out by taking the complete geometry of the heat transfer surface and more realistic hydrodynamic and thermal boundary conditions. A cold channel with two chevron plates and two halves of hot channels on either side having flat periodic boundaries was selected as the computational domain. The numerical model was validated with data from experiments and empirical correlations from literature. Heat transfer and pressure drop data were obtained experimentally with water as the working fluid, in the Reynolds number range 400–1300 and the Prandtl number range 4.4–6.3.

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