Refrigerant R134a vaporisation heat transfer and pressure drop inside a small brazed plate heat exchanger

2007 ◽  
Vol 30 (5) ◽  
pp. 821-830 ◽  
Author(s):  
G.A. Longo ◽  
A. Gasparella
Keyword(s):  
Heat Transfer ◽  
Heat Exchanger ◽  
Pressure Drop ◽  
Plate Heat Exchanger ◽  
Plate Heat ◽  
Brazed Plate Heat Exchanger

Performance of a Plate Heat Exchanger Operated with Water-Al2O3 Nanofluid

2016 ◽  
Vol 831 ◽  
pp. 188-197 ◽  
Author(s):  
Janusz T. Cieśliński ◽  
Artur Fiuk ◽  
Wojciech Miciak ◽  
Bartłomiej Siemieńczuk
Keyword(s):  
Heat Transfer ◽  
Heat Exchanger ◽  
Pressure Drop ◽  
Plate Heat Exchanger ◽  
Transfer Coefficients ◽  
Plate Heat ◽  
Heat Transfer Coefficients ◽  
Overall Heat Transfer Coefficient ◽  
Weight Impact ◽  
Brazed Plate Heat Exchanger

This study is focused on experimental investigation of a selected type of brazed plate heat exchanger (PHEx). The main aim of the paper was to experimentally check the ability of nanofluids to enhance the performance of PHEx. A typical water-Al2O3 nanofluid was tested and compared to that of the base fluid, i.e. water. Nanoparticles were tested at the concentration of 0.1% and 1% by weight. Impact of the 1 day and 3 days break of operation of the tested PHEx on its performance was of particular interest. Pressure drop in all runs was measured as well. The Wilson approach was applied in order to estimate heat transfer coefficients for the PHEx passages. It was observed, that addition of nanoparticles resulted in deterioration of an overall heat transfer coefficient for the selected PHEx and tested conditions, i.e. temperature range and Reynolds number. Moreover, substantial increase of pressure drop was recorded after each break of operation of the tested PHEx.

Numerical Investigation of a Chevron Type Brazed Plate Heat Exchanger

2015 ◽  
Vol 787 ◽  
pp. 222-226
Author(s):  
N. Manigandan ◽  
M. Suresh
Keyword(s):  
Heat Transfer ◽  
Heat Exchanger ◽  
Pressure Drop ◽  
Numerical Investigation ◽  
Flow Characteristics ◽  
Plate Heat Exchanger ◽  
Element Analysis ◽  
Plate Heat ◽  
Overall Heat Transfer Coefficient ◽  
Brazed Plate Heat Exchanger

A numerical investigation has been carried out in the present work to study flow characteristics and thermal performance of a chevron type brazed plate heat exchanger (PHE). A local element-by-element analysis utilizing e-NTU method is employed for simulating the heat exchanger. In this approach, Nusselt number is expressed in terms of friction factor which in turn, is given as a function of chevron angle of the heat exchanger. Water has been used as cold and hot fluid. Effect of fluid flow rate and inlet temperatures on the heat duty, overall heat transfer coefficient, fluid outlet temperatures and pressure drop have been studied. When compared with literature results of intermating plate heat exchangers, chevron type plate heat exchanger gives greater heat transfer enhancement, though with increased pressure drop.

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