scholarly journals Enhancing the Heat Transfer in an Active Barocaloric Cooling System Using Ethylene-Glycol Based Nanofluids as Secondary Medium

Energies ◽  
2019 ◽  
Vol 12 (15) ◽  
pp. 2902 ◽  
Author(s):  
Ciro Aprea ◽  
Adriana Greco ◽  
Angelo Maiorino ◽  
Claudia Masselli
Keyword(s):  
Heat Transfer ◽  
Heat Exchanger ◽  
Solid State ◽  
Ethylene Glycol ◽  
Copper Nanoparticles ◽  
General Trend ◽  
Cooling System ◽  
Heat Fluxes ◽  
Refrigeration Cycle ◽  
Transfer Enhancement

Barocaloric cooling is classified as environmentally friendly because of the employment of solid-state materials as refrigerants. The reference and well-established processes are based on the active barocaloric regenerative refrigeration cycle, where the solid-state material acts both as refrigerant and regenerator; an auxiliary fluid (generally water of water/glycol mixtures) is used to transfer the heat fluxes with the final purpose of subtracting heat from the cold heat exchanger coupled with the cold cell. In this paper, we numerically investigate the effect on heat transfer of working with nanofluids as auxiliary fluids in an active barocaloric refrigerator operating with a vulcanizing rubber. The results reveal that, as a general trend, adding 10% of copper nanoparticles in the water/ethylene-glycol mixture carries to +30% as medium heat transfer enhancement.

Alumina Nanofluid for Spray Cooling Enhancement

2007 ◽  
Author(s):  
Aditya Bansal ◽  
Frank Pyrtle
Keyword(s):  
Heat Transfer ◽  
Heat Transfer Enhancement ◽  
Heat Dissipation ◽  
Cooling System ◽  
Spray Cooling ◽  
Open Loop ◽  
Heat Fluxes ◽  
Alumina Nanoparticles ◽  
Transfer Enhancement ◽  
Thermal Conductivities

Nanofluids have been demonstrated as promising for heat transfer enhancement in forced convection and boiling applications. The addition of carbon, copper, and other high-thermal-conductivity nanoparticles to water, oil, ethylene glycol, and other fluids has been determined to increase the thermal conductivities of these fluids. The increased effective thermal conductivities of these fluids enhance their abilities to dissipate heat in such applications. The use of nanofluids for spray cooling is an extension of the application of nanofluids for enhancement of heat dissipation. In this investigation, experiments were performed to determine the level of heat transfer enhancement with the addition of alumina nanoparticles to the fluid. Using mass percentages of up to 0.5% alumina nanoparticles suspended in water, heat fluxes and surface temperatures were measured and compared. Compressed nitrogen was used to provide constant spray nozzle pressures to produce full-cone sprays in an open loop spray cooling system. Heat fluxes were measured for single-phase and evaporative spray cooling regimes.

scholarly journals Characterization of heat transfer on concentric tube heat exchanger using ethylene glycol/TiO2 nanofluid

2021 ◽  
Vol 1034 (1) ◽  
pp. 012045
Author(s):  
Herry Irawansyah ◽  
Abdul Ghofur ◽  
Rachmat Subagyo ◽  
Mastiadi Tamjidillah ◽  
Bagus Harits Pratama ◽  
...  
Keyword(s):  
Heat Transfer ◽  
Heat Exchanger ◽  
Ethylene Glycol ◽  
Tube Heat Exchanger

Heat transfer enhancement for fin-tube heat exchanger using vortex generators

2002 ◽  
Vol 16 (1) ◽  
pp. 109-115 ◽  
Author(s):  
Seong-Yeon Yoo ◽  
Dong-Seong Park ◽  
Min-Ho Chung ◽  
Sang-Yun Lee
Keyword(s):  
Heat Transfer ◽  
Heat Exchanger ◽  
Heat Transfer Enhancement ◽  
Vortex Generators ◽  
Transfer Enhancement ◽  
Tube Heat Exchanger ◽  
Fin Tube
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