Thermal-hydraulic characteristics of gasketed plate heat exchangers as a preheater for thermal desalination systems

Effect of Surface Roughness on Thermal-Hydraulic Characteristics of Plate Heat Exchanger

Key Engineering Materials ◽

10.4028/www.scientific.net/kem.597.63 ◽

2013 ◽

Vol 597 ◽

pp. 63-74 ◽

Cited By ~ 7

Author(s):

Jan Wajs ◽

Dariusz Mikielewicz

Keyword(s):

Heat Transfer ◽

Heat Exchanger ◽

Heat Exchangers ◽

Single Phase ◽

Plate Heat Exchanger ◽

Heat Transfer Surface ◽

Surface Model ◽

Phase System ◽

Hydraulic Characteristics ◽

Plate Heat

In the paper the experimental analysis of passive heat transfer intensification in the case of modeled plate heat exchanger is conducted. The plate heat exchanger is chosen for the analysis because this kind of heat exchangers could be prospectively applied in the ORC systems, however other areas or application are equally possible. The experimental set-up was assembled at the Department of Energy and Industrial Apparatus of Gdansk University of Technology. The passive intensification was obtained by a modification of the heat transfer surface. The roughness of surface was increased by use of glass shot.During the experiment single-phase convective heat transfer in the single phase system was studied. The experiment was done in two stages. In the first stage the model of commercial plate heat exchanger was investigated, while in the second stage the identical one but with modified heat transfer surface. Model of heat exchanger consisted of three plates. The direct comparison of thermal and flow characteristics between both devices was possible due to assurance of equivalent conditions at the inlet to the system.The thermal and hydraulic characteristics are presented. The thermal analysis shows that in some range of heat flux density the overall heat transfer coefficient was higher for the commercial heat exchanger, while for the other was higher for the heat exchanger with modified surface. The influence of larger roughness on heat transfer cannot unequivocally be evaluated. Therefore as the next step the systematic investigations of model heat exchangers (only with one hot and one cold passage) will be conducted.

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A CFD Study of the Thermo-Hydraulic Characteristics of Pillow-Plate Heat Exchangers

Volume 1: Heat Transfer in Energy Systems; Thermophysical Properties; Theory and Fundamentals in Heat Transfer; Nanoscale Thermal Transport; Heat Transfer in Equipment; Heat Transfer in Fire and Combustion; Transport Processes in Fuel Cells and Heat Pipes; Boiling and Condensation in Macro, Micro and Nanosystems ◽

10.1115/ht2016-7176 ◽

2016 ◽

Cited By ~ 2

Author(s):

Mark Piper ◽

Julian M. Tran ◽

Eugeny Y. Kenig

Keyword(s):

Heat Transfer ◽

Heat Exchangers ◽

Single Phase ◽

Hydraulic Characteristics ◽

Present Contribution ◽

Widespread Application ◽

Promising Alternative ◽

Plate Heat ◽

The Past ◽

Flow And Heat Transfer

Pillow-plate heat exchangers (PPHE) are manufactured as stacks of pillow plates, with a typical wavy surface. They represent a promising alternative to conventional equipment for the process industry; however, the lack of published design methods hinders their widespread application. Over the past years, our group has been intensively studying PPHE, using both theoretical and experimental methods. In the present contribution, the results of a CFD-based investigation of single-phase flow and heat transfer in both the inner and the outer pillow-plate channels are presented. In particular, the influence of using an advanced eddy viscosity turbulence model, namely, the elliptic blending k-ε model, on pressure drop and heat transfer in the outer channel is shown. Furthermore, a comparison between the thermo-hydraulic efficiencies of PPHE and pipes is undertaken, in order to identify the benefits of PPHE.

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