Numerical analysis of the cooling performance of a totally enclosed air-to-air cooled motor using a dual cell heat exchanger model

2021 ◽  
Author(s):  
Sang-Chul Sung ◽  
Seung-Ki Kim ◽  
Myung-Do Oh
Keyword(s):  
Heat Exchanger ◽  
Numerical Analysis ◽  
Cooling Performance

Micro-Refrigerator Fabricated on Silicon Wafer

2007 ◽  
Author(s):  
Y. Takata ◽  
K. Sugahara ◽  
T. Tachikawa ◽  
S. Moroe ◽  
H. Kubota ◽  
...  
Keyword(s):  
Thermal Conductivity ◽  
Heat Exchanger ◽  
Numerical Analysis ◽  
Silicon Wafer ◽  
Flow Rate ◽  
Cooling Power ◽  
Temperature Profiles ◽  
Evaporator Temperature ◽  
Cooling Performance ◽  
Gas Pressures

A prototype Joule-Thomson micro-cooler was fabricated on silicon wafer by making use of photofabrication. The micro-cooler uses ethylene as a refrigerant and it consists mainly of heat exchanger and evaporator. The cooling power of 20mW at evaporator temperature of 272K was attained at the inlet and outlet gas pressures of 2.5MPa and 0.1MPa, respectively. To understand the low cooling performance, numerical analysis of heat exchanger has been done and the effects of mass flow rate and thermal conductivity of solid on temperature profiles and effectiveness were examined. It was found that the flow rate of present experiment is too large and the decrease in flow rate gives better temperature effectiveness of heat exchanger. It was also found that the low thermal conductivity of solid improves the performance of heat exchanger.

Flexible Joule-Thomson Micro-Refrigerator

2009 ◽  
Author(s):  
M. Kohno ◽  
A. Tanabe ◽  
Y. Kuwamoto ◽  
H. Kubota ◽  
Y. Takata
Keyword(s):  
Heat Exchanger ◽  
Numerical Analysis ◽  
Mass Flow Rate ◽  
Flow Rate ◽  
Cooling Power ◽  
Temperature Profiles ◽  
Evaporator Temperature ◽  
Cooling Performance ◽  
Inner Diameter ◽  
Outside Diameter

In this study, a prototype flexible Joule-Thomson micro-refrigerator was fabricated and its cooling power was examined. The micro-refrigerator uses N2, C2H4 or CO2 as a working gas and it consists mainly of a heat exchanger and an evaporator. The outside diameter of the heat exchanger outer tube is 0.9 mm and that of the inner tube is 0.4 mm. The length of the heat exchanger is 450mm. The inner diameter of the evaporator capillary is 0.1 mm. A cooling power of 100 mW at an evaporator temperature of 277 K was attained for inlet and outlet gas (CO2) pressures of 5.0 MPa and 0.1 MPa, respectively. To understand the cooling performance, a numerical analysis of the heat exchanger has been done and the effects of mass flow rate and dimensions of the heat exchanger on temperature profiles and effectiveness were examined.

Numerical analysis of secondary heat exchanger designed for CHP units with microturbine

2015 ◽  
Vol 83 ◽  
pp. 487-498 ◽  
Author(s):  
Adéla Macháčková ◽  
Radim Kocich ◽  
Marian Bojko ◽  
Zuzana Klečková
Keyword(s):  
Heat Exchanger ◽  
Numerical Analysis

Experimental and numerical analysis of a plate heat exchanger using variable heat transfer coefficient

2021 ◽  
pp. 1-19
Author(s):  
Muhammad Ahmad Jamil ◽  
Talha S. Goraya ◽  
Haseeb Yaqoob ◽  
Muhammad Wakil Shahzad ◽  
Syed M. Zubair
Keyword(s):  
Heat Transfer ◽  
Heat Transfer Coefficient ◽  
Heat Exchanger ◽  
Numerical Analysis ◽  
Transfer Coefficient ◽  
Plate Heat Exchanger ◽  
Plate Heat ◽  
Variable Heat

scholarly journals Numerical Analysis of the Factors Influencing a Vertical U-Tube Ground Heat Exchanger

2016 ◽  
Vol 8 (9) ◽  
pp. 882 ◽  
Author(s):  
Shangyuan Chen ◽  
Jinfeng Mao ◽  
Xu Han ◽  
Chaofeng Li ◽  
Liyao Liu
Keyword(s):  
Heat Exchanger ◽  
Numerical Analysis ◽  
Ground Heat Exchanger ◽  
Factors Influencing
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