Design and Evaluation of Evaporating Lens Direct Contact Heat Exchangers

1981 ◽  
Vol 103 (2) ◽  
pp. 128-132 ◽  
Author(s):  
C. A. Kodres ◽  
H. R. Jacobs ◽  
R. F. Boehm
Keyword(s):  
Heat Flux ◽  
Heat Exchanger ◽  
Heat Exchangers ◽  
Direct Contact ◽  
Lens Model ◽  
Contact Heat ◽  
Geothermal Heat ◽  
Single Lens ◽  
Explicit Procedure ◽  
Direct Contact Heat Exchanger

An explicit procedure for analyzing a superheated, evaporating lens direct contact heat exchanger has been developed. This method is based upon the application of a dimensional analysis derivation of a relationship for the heat flux from a single evaporating lens. Several suggestions are offered for use in the design of these devices. To estimate the error introduced by extrapolating a single lens model to represent a system of lenses, the method is used to “design” two operating geothermal heat exchangers. A difference of about 16 percent is observed between the calculated and measured overall heat flux.

New metrics for measuring multiphase mixing effects in a direct-contact heat exchanger

2019 ◽  
Vol 147 ◽  
pp. 592-601 ◽  
Author(s):  
Jianxin Xu ◽  
Qingtai Xiao ◽  
Zhihan Lv ◽  
Junwei Huang ◽  
Ruoxiu Xiao ◽  
...  
Keyword(s):  
Heat Exchanger ◽  
Direct Contact ◽  
Contact Heat ◽  
Mixing Effects ◽  
Direct Contact Heat Exchanger

scholarly journals Analytical Modelling of a Spray Column Three-Phase Direct Contact Heat Exchanger

2013 ◽  
Vol 2013 ◽  
pp. 1-9 ◽  
Author(s):  
Hameed B. Mahood ◽  
Adel O. Sharif ◽  
Seyed Ali Hosseini ◽  
Rex B. Thorpe
Keyword(s):  
Heat Transfer ◽  
Heat Transfer Coefficient ◽  
Heat Exchanger ◽  
Transfer Coefficient ◽  
Direct Contact ◽  
Relative Velocity ◽  
Contact Heat ◽  
Spray Column ◽  
Three Phase ◽  
Direct Contact Heat Exchanger

An analytical model for the temperature distribution of a spray column, three-phase direct contact heat exchanger is developed. So far there were only numerical models available for this process; however to understand the dynamic behaviour of these systems, characteristic models are required. In this work, using cell model configuration and irrotational potential flow approximation characteristic models has been developed for the relative velocity and the drag coefficient of the evaporation swarm of drops in an immiscible liquid, using a convective heat transfer coefficient of those drops included the drop interaction effect, which derived by authors already. Moreover, one-dimensional energy equation was formulated involving the direct contact heat transfer coefficient, the holdup ratio, the drop radius, the relative velocity, and the physical phases properties. In addition, time-dependent drops sizes were taken into account as a function of vaporization ratio inside the drops, while a constant holdup ratio along the column was assumed. Furthermore, the model correlated well against experimental data.

Cold energy release characteristics of an ice/air direct contact heat exchanger

2001 ◽  
Vol 30 (2) ◽  
pp. 95-113
Author(s):  
Akiyoshi Ohira ◽  
Michio Yanadori ◽  
Kunihiko Iwabuchi ◽  
Toshikatsu Kimura ◽  
Yuji Tsubota
Keyword(s):  
Heat Exchanger ◽  
Energy Release ◽  
Direct Contact ◽  
Contact Heat ◽  
Cold Energy ◽  
Direct Contact Heat Exchanger

Liquid-liquid direct contact heat exchanger for solar application

KSME Journal ◽  
1995 ◽  
Vol 9 (1) ◽  
pp. 19-28 ◽  
Author(s):  
In Seak Kang ◽  
Chong Bo Kim ◽  
Won Gee Chun
Keyword(s):  
Heat Exchanger ◽  
Direct Contact ◽  
Contact Heat ◽  
Direct Contact Heat Exchanger ◽  
Solar Application
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