Numerical simulation of heat transfer performance of an air-cooled steam condenser in a thermal power plant

2009 ◽  
Vol 45 (11) ◽  
pp. 1423-1433 ◽  
Author(s):  
Xiufeng Gao ◽  
Chengwei Zhang ◽  
Jinjia Wei ◽  
Bo Yu
Keyword(s):  
Heat Transfer ◽  
Numerical Simulation ◽  
Power Plant ◽  
Thermal Power Plant ◽  
Heat Transfer Performance ◽  
Thermal Power ◽  
Transfer Performance

scholarly journals Comparison of Heat Transfer Enhancement Techniques in Latent Heat Storage

2020 ◽  
Vol 10 (16) ◽  
pp. 5519 ◽  
Author(s):  
William Delgado-Diaz ◽  
Anastasia Stamatiou ◽  
Simon Maranda ◽  
Remo Waser ◽  
Jörg Worlitschek
Keyword(s):  
Heat Transfer ◽  
Energy Storage ◽  
Latent Heat ◽  
Heat Transfer Performance ◽  
Thermal Power ◽  
High Energy ◽  
High Energy Density ◽  
Evaluation Procedure ◽  
Transfer Performance ◽  
Experimental Conditions

Latent Heat Energy Storage (LHES) using Phase Change Materials (PCM) is considered a promising Thermal Energy Storage (TES) approach as it can allow for high levels of compactness, and execution of the charging and discharging processes at defined, constant temperature levels. These inherent characteristics make LHES particularly attractive for applications that profit from high energy density or precise temperature control. Many novel, promising heat exchanger designs and concepts have emerged as a way to circumvent heat transfer limitations of LHES. However, the extensive range of experimental conditions used to characterize these technologies in literature make it difficult to directly compare them as solutions for high thermal power applications. A methodology is presented that aims to enable the comparison of LHES designs with respect to their compactness and heat transfer performance even when largely disparate experimental data are available in literature. Thus, a pair of key performance indicators (KPI), ΦPCM representing the compactness degree and NHTPC, the normalized heat transfer performance coefficient, are defined, which are minimally influenced by the utilized experimental conditions. The evaluation procedure is presented and applied on various LHES designs. The most promising designs are identified and discussed. The proposed evaluation method is expected to open new paths in the community of LHES research by allowing the leveled-ground contrast of technologies among different studies, and facilitating the evaluation and selection of the most suitable design for a specific application.

scholarly journals Experimental Observation of Natural Convection Heat Transfer Performance of a Rectangular Thermosyphon

Energies ◽  
2019 ◽  
Vol 12 (9) ◽  
pp. 1702 ◽  
Author(s):  
C. S. Huang ◽  
Chia-Wang Yu ◽  
R. H. Chen ◽  
Chun-Ta Tzeng ◽  
Chi-Ming Lai
Keyword(s):  
Heat Transfer ◽  
Natural Convection ◽  
Heat Transfer Performance ◽  
Thermal Power ◽  
Convection Heat Transfer ◽  
Natural Convection Heat Transfer ◽  
Transfer Performance ◽  
Convection Heat ◽  
Heating Section ◽  
Cooling Section

This study experimentally investigates the natural convection heat transfer performance of a rectangular thermosyphon with an aspect ratio of 3.5. The experimental model is divided into a loop body, a heating section, a cooling section, and two adiabatic sections. The heating section and the cooling section are located in the vertical legs of the rectangular loop. The length of the vertical heating section and the length of the upper and lower horizontal insulation sections are 700 mm and 200 mm, respectively, and the inner diameter of the loop is 11 mm. The relevant parameters and their ranges are as follows: the input thermal power is 30–60 W (with a heat flux in the range of 60–3800 W/m2); the temperature in the cooling section is 30, 40, or 50 °C; and the potential difference between the hot and cold sections is 5, 11, or 18 for the cooling section lengths of 60, 45, and 30 cm, respectively. The results indicate that the value of the dimensionless heat transfer coefficient, the Nusselt number, is generally between 5 and 10. The heating power is the main factor affecting the natural convection intensity of the thermosyphon.

Improving air-side heat transfer performance in air-cooled power plant condensers

2020 ◽  
Vol 170 ◽  
pp. 114913 ◽  
Author(s):  
Jennifer Lin ◽  
Allison J. Mahvi ◽  
Taylor S. Kunke ◽  
Srinivas Garimella
Keyword(s):  
Heat Transfer ◽  
Power Plant ◽  
Heat Transfer Performance ◽  
Transfer Performance

Effect of Protuberances in the Heat Transfer Enhancement in Mini-Channels

2021 ◽  
Author(s):  
Ariel Cruz Diaz ◽  
Gerardo Carbajal
Keyword(s):  
Heat Transfer ◽  
Numerical Simulation ◽  
Pressure Drop ◽  
Heat Transfer Enhancement ◽  
Heat Transfer Performance ◽  
Heat Removal ◽  
Working Fluid ◽  
Transfer Performance ◽  
Transfer Enhancement ◽  
Mini Channels

Abstract This study presents the effects of adding an array of protrusions in a microchannel for heat transfer enhancement. The presence of mini-channels increases the overall heat transfer area and boosts the mixing development near the solid-fluid interaction; therefore, it can remove more heat than conventional mini-channels without protuberances. A numerical study proved that protuberances in a mini-channel increase the heat transfer performance by disturbing the relative fluid motion near the solid wall. The numerical simulation was performed with three different protuberances arrays: aligned, staggered, and angular. Each array consists of a thin flat plate with a hemispherical shape; the working fluid and the solid materials were water and copper. The study also includes the effect of different Reynolds numbers: 1,000, 1,500, and 2,000. Three heat inputs were applied in the numerical simulation; these were 1W, 3W, and 5W. The study was compared with a simple microchannel with non-protuberances to analyze the microchannel performance regarding heat removal and pressure drop. For heat transfer performance, the best array was the staggering array with a maximum heat removal increase of 5.26 percent. In terms of pressure drop performance, the best array was the aligned array, with a maximum increase of 34.73 percent.

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