scholarly journals Direct contact liquid-liquid heat exchanger for solar-heated and -cooled buildings. Final report, January 1, 1979-May 30, 1980

1980 ◽  
Author(s):  
S. Karaki ◽  
P. Brothers
Keyword(s):  
Heat Exchanger ◽  
Direct Contact ◽  
Final Report ◽  
Liquid Heat ◽  
Contact Liquid

scholarly journals GLEF direct-contact heat-exchanger program. Final report

1980 ◽  
Author(s):  
P.L. Della Vida ◽  
F.J. Franz ◽  
R.S. Weinreich
Keyword(s):  
Heat Exchanger ◽  
Direct Contact ◽  
Final Report ◽  
Contact Heat ◽  
Direct Contact Heat Exchanger

scholarly journals Numerical Analysis of Liquid–Liquid Heat Pipe Heat Exchanger Based on a Novel Model

Energies ◽  
2021 ◽  
Vol 14 (3) ◽  
pp. 589
Author(s):  
Qilu Chen ◽  
Yutao Shi ◽  
Zhi Zhuang ◽  
Li Weng ◽  
Chengjun Xu ◽  
...  
Keyword(s):  
Experimental Data ◽  
Heat Exchanger ◽  
Heat Pipe ◽  
Temperature Change ◽  
Current Model ◽  
Change Trend ◽  
Liquid Heat ◽  
Novel Model ◽  
Pipe Heat ◽  
Vapor Temperature

Heat pipe heat exchangers (HPHEXs) are widely used in various industries. In this paper, a novel model of a liquid–liquid heat pipe heat exchanger in a countercurrent manner is established by considering the evaporation and condensation thermal resistances inside the heat pipes (HPs). The discrete method is added to the HPHEX model to determine the thermal resistances of the HPs and the temperature change trend of the heat transfer fluid in the HPHEX. The established model is verified by the HPHEX structure and experimental data in the existing literature and demonstrates numerical results that agree with the experimental data to within a 5% error. With the current model, the investigation compares the effectiveness and minimum vapor temperature of the HPHEX with three types of HP diameters, different mass flow rates, and different H* values. For HPs with a diameter of 36 mm, the effectiveness of each is improved by about 0.018 to 0.029 compared to HPs with a diameter of 28 mm. The results show that the current model can predict the temperature change trend of the HPHEX well; in addition, the effects of different structures on the effectiveness and minimum vapor temperature are obtained, which improve the performance of the HPHEX.

Performance of a Three-Phase, Spray-Column, Direct-Contact Heat Exchanger

1989 ◽  
Vol 111 (1) ◽  
pp. 166-172 ◽  
Author(s):  
T. C¸oban ◽  
R. Boehm
Keyword(s):  
Heat Exchanger ◽  
Direct Contact ◽  
Local Heat Transfer ◽  
Local Heat ◽  
Column Height ◽  
Contact Heat ◽  
Factors Affecting ◽  
Spray Column ◽  
Three Phase ◽  
New Formulation

A numerical model of a three-phase, direct-contact, spray-column heat exchanger has been developed. This model has been used to calculate performance information about this type of device and to compare, where possible, to experiments. General equations are defined for distance up the column using a physically based model for the local heat transfer. This model has been used to investigate a number of characteristics of these devices, such as temperature and holdup distributions through the column. A new formulation is given for a mixed, time-averaged temperature that may be representative of measurements taken with temperature transducers in direct-contact heat exchangers. Little has been given in the literature about quantitative variations of performance as a function of the key independent variables, and information on these aspects is presented here. Although the results presented are for a specific geometry (0.61 m diameter, 3 m active column height, evaporating pentane in 85°C water), the variations shown can give insights generally into the factors affecting performance in these devices. In virtually all cases examined here, extremely good comparisons are shown between predictions and measurements. Conclusions are drawn about the applicability of the model and the important effects demonstrated.

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