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Due to the time-dependency of the supply of solar energy which may not necessarily match the demand for the energy resource, storage systems have been designed to cater for the resulting mismatch. Thermal energy storage systems may be used to store thermal energy from the sun which can be used for the provision of the heat necessary to cook during periods of low or no solar radiation. The thermal...
Solar air heaters form the major component of solar energy utilization systems which absorb the incoming solar radiation, converting it into thermal energy at the absorbing surface, and transferring the energy to a fluid flowing through the collector. This paper presents the outline of an experimental investigation of the performance of a flat plate air solar collector for use with solar desalination...
The paper presents a study on heat transfer, friction loss and thermal performance behaviors in a solar air heater channel fitted with baffle turbulator (BT) or triangular-winglet vortex generator (WVG) at various winglet/baffle to channel-height or blockage ratios (BR=b/H=0.1 0.15 and 0.2). The BT and the WVG were placed only on the upper wall/absorber plate of the test channel at a single axial...
Packed beds are generally used for storage of thermal energy from solar air heaters. In this paper experimental study has been conducted on a porous packed bed solar air heater using iron chips as packing material. The parameters used for study include equivalent diameter of packing material ( iron chips) 1.51 mm, porosity 0.652 and 0.816, mass flow rate from 0.014 - 0.0365 kg/s and packing Reynolds...
This paper seeks to demonstrate the performance of a thermoelectric energy recovery module (TERM). The TERM aims to convert the waste heat from power amplifier (PA) transistors into the useful power. The TERM contains a thermoelectric generator (TEG), a heat spreader, and a heat sink. A first order prototype of the TERM is generated and used as a test vehicle. Experimental setup mainly consists of...
In this paper, a new type of U-type pile evacuated glass tubular solar collector filled with graphite has been proposed and investigated its thermal performance experimentally, and testing accuracy has been analyzed by the error analysis method. Following dynamic testing method, the outlet temperature and momentary efficiency equation of the collector were got. The results showed that, U-tubular evacuated...
In this experimental investigation novel honeycomb heat sink designs that incorporate slots of varying length are presented. Thermal and hydrodynamic performance comparisons are made for a longitudinally-finned heat sink, a wavy wall heat sink of the same geometric dimensions, a closed channel honeycomb heat sink and a number of honeycomb heat sinks with different length (3mm, 6mm and 13mm) of vertically...
Fundamental thermal performance of a liquid cooling system for small electronic equipment has been examined in this paper. A liquid cooling system is attracting attention because an increase of heat generation density in electronic components requires effective cooling. The cooling system proposed in this study uses a mini-pipe and a microencapsulated phase change material (MEPCM). The coolant including...
The effect of intermittent operation on the heat transfer performance of vertical U buried pipe heat exchangers is studied by method of numerical simulation and analytical solution. The calculation area is divided into two parts by the boundary of the borehole wall. For the area in the borehole, the calculation method is steady analytical solution, and for the soil area, the method is finite volume...
Electronic devices continue to shrink in size while dissipating more heat. The size of the air cooled heat sinks required to remove this heat has increased while the size of the heat source has decreased. These trends have resulted in large conduction gradients across the base of the heat sinks, resulting in decreased thermal performance. A passive and reliable method of minimizing the spreading resistance...
To develop a high effectiveness, reliable, cost-effective compact heat exchanger is one of the key issues for effective use of thermal energy. By stacking multilayered flat thin rectangular plates with a number of regular honeycomb cells etched inside, the well designed staggered fluid flow channels are formed to enhance heat transfer. For the cooling system with the new type design heat sink, experimental...
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