The optimization of a nanofluid-cooled rectangular microchannel heat sink is reported. Two nanofluids with volume fraction 1 %, 3 5 7 % and 9 are employed to enhance the overall performance system. An scheme applied consisting systematic thermal resistance model as an analysis method elitist non-dominated sorting genetic algorithm (NSGA-II). optimized results showed that increase in particles decrease total pumping power. For fractions resistances were 0.072, 0.07151, 0.07075, 0.07024 0.070...

A thermoacoustic refrigerator is a device that uses acoustic power to pump heat in the absence of harmful refrigerants with no or few moving parts. However, performance refrigerator, particularly standing wave types, currently not competitive compared its counterpart, conventional vapor-compression refrigerator. Presently, refrigeration prototypes only achieved 0.1–0.2 relative coefficient performance, 0.33–0.5 for refrigerators. Past optimization efforts had been completed based on...

Performance of the two-phase flow in a minichannel had past been measured by pressure drop or/and heat transfer coefficient.The desired low across small channel follows coefficient.Optimization system is generally achieved either experimentally through discrete variations each parameters involved while holding rest constant, or numerically which also possible parametric study.The objective this study was to investigate thermodynamic performance terms entropy generation minimization (EGM)...

Abstract Increasing the efficiency and effectiveness of energy systems remains as one critical issues today with depleting resources increasing demand. Utilization alternative fuels utilization waste heat has also become a major research area. This study reports an investigation on development portable thermoacoustic engine that converts from combustion process into acoustic power. The prime mover operates temperature gradient imposed celcor ceramic stack which then induced pressure...

Successful standing wave thermoacoustic refrigerators reported to date still have issues with the stack, primary medium of system. Being core whole system, performance stack directly influences refrigerator performance. Besides lack a comprehensive theory on cooling in establishing good temperature difference across that is very much desired, fabrication an issue. Currently, involved ready-made celcor ceramic material cut specification or hand-made spiral/parallel plate from Mylar, most...

The scarcity of energy resources and increasing concerns over the environmental degradation due to global warming hazardous pollution has spurred extensive research into alternative clean technologies as well more efficient energy-related systems. Most importantly, optimization performance cooling systems is crucial for best practices in management. Environmentally friendly thermoacoustic refrigerators that use no refrigerant or compressor are currently being considered alternatives....

Minimization of the thermal resistance and pressure drop a microchannel heat sink is desirable for effective removal which becoming serious challenge due to continuous miniaturization such cooling systems with increasing high generation rate. Optimization hydraulic diameter wall width channel ratio square circular microchannels minimize two objective functions was completed multi-objective genetic algorithm (MOGA). Environmentally friendly liquid ammonia used as coolant thermophysical...

The microchannel heat sink (MCHS) has been established as an effective removal system in electronic chip packaging. With increasing power demand, research advanced beyond the conventional coolants of air and water towards nanofluids with their enhanced transfer capabilities. This had carried out on optimization thermal hydrodynamic performance a rectangular cooled carbon nanotube (CNT) nanofluid, coolant that recently discovered improved conductivity. Unlike common spherical particles,...

In this paper, the optimization of cooling performance a rectangular microchannel heat sink is investigated with four different gaseous coolants; air, ammonia gas, dichlorodifluoromethane (R-12) and chlorofluoromethane (R-22). A systematic robust thermal resistance model together methodical pumping power calculation used to formulate objective functions, power. The non-dominated sorting genetic algorithm (NSGA-II), multi-objective algorithm, applied in procedure. optimized resistances...

Natural refrigerant as replacement for conventional is more intensively used reducing environmental damage.This research aims were to flow pattern mapping and study heat transfer, pressure drop of two-phase boiling with natural in microchannel.Experimental method evaporative process test section on tube diameter 500 µm length 0.5 meter.Observation parameter mass flux 681 -766 kgm -2 s -1 , 5.28 -7.66 kWm saturation temperature 31.96-33.14 o C. Result experiment showed single regime low vapor...

ved thermal conductivity in particular at higher concentrations, different types of surfactant normally added used to stabilize the nanofluid have reported resistance heat flow. This paper reports an analysis performance a nanofuid-cooled microchannel sink (MCHS) with 0.1% volume fraction CNT utilizing two surfactants; Lignin (N2) and sodium polycarboxylate (N3) as stabilizers. Multi-objective particle swarm optimization (MOPSO) algorithm was utilized simultaneously minimize pumping power by...

This study demonstrated the single phase boiling heat transfer of water in horizontal multiport minichannels. The experimental data were observed aluminum tube 7.9 x 2.5 mm (width high) with 7 rectangular channels and length 500 mm, Reynolds number 1400 – 4200, fluxes 3 6 kWm-2. effects mass on coefficient analyzed. transition flow regime was at 3000. Finally, CFD simulation also set up compared data. results showed that well agreement ones.