Experimental Study On The Body Thermal Protection System Adopting Thermoelectric Refrigeration Technology

In the steel mills, mines, tanks and other special occasions, the operators are in a high temperature condition,which makes the operators uncomfortable and decreases work efficiency. In recent decades, those thermal protection problems under high temperature environment are mainly solved through the air conditioning and microclimate cooling system based on the conventional compression refrigeration systems and absorption refrigeration technology. However, since the1990s, In the background that CFCs (chloro-fluoro-carbons) refrigerant are gradually forbidden and there are increasingly strict emission regulations and environment protection, the thermoelectric refrigeration system that is made up of non-moving parts and takes solid material as the working media, has advantages over the compression refrigeration technology, because it has a simple construction and a quiet and safe work condition. The thermoelectric refrigeration technology attracts more and more attention, which its study and applicationare are constantly expanding to more deepness and breadth.In this paper, based on narrative and analysis on theory of the thermoelectric refrigeration system and combined the thermoelectric refrigeration system with the liquid-cooled suit, Based on the discussion and analysis of the principle of thermoelectric cooling, this paper launches experimental study thermoelectric cooling body thermal protection system under the conditions that tank cabin is in the high temperature environment. Firstly, at the room temperature (around25℃), the comparisons on the refrigeration effect of the hot end of the thermoelectric refrigeration system are investigated by experimental methodology under the heat-dissipating methods of water-cooling, finned-cooler combined with fan and water-cooling combined with fan, which is hoped that the best heat-dissipating method is found. Secondly, the performances of the thermoelectric refrigeration system adopting water-cooling method are tested by changing the input electric current value and the water temperature of the hot end to explore the influence of related parameters on the performances of the thermoelectric refrigeration system. Lastly, the experiment module that can simulate the high temperature conditions and its temperature can be adjusted is set up, and the performances of the thermoelectric refrigeration system are researched by changing the temperature around the system under the heat-dissipating methods of water-cooling, finned-cooler combined with fan and water-cooling combined with fan, which that the variation tendency of the performances of the thermoelectric refrigeration system with varying temperature can be explored under high temperature conditions that their temperatures are above35℃. The conclusions are as follows:(1) At the room temperature (around25℃), the refrigerating capacity of the thermoelectric refrigeration system has a tendency which increases with higher electric current value, but the tendency become gradually more flattening with higher electric current value, which it is that the effect that the refrigerating capacity is increased by heightening electric current value will become worse with higher electric current value. And after reaching a maximum value, heightening electric current value could lower the he refrigerating capacity, and the refrigeration coefficient will be smaller gradually with higher electric current value for power consumption.(2) Among the heat-dissipating methods included water-cooling, finned-cooler combined with fan and water-cooling combined with fan, the refrigerating capacity of the finned-cooler combined with fan is the lowest, and the refrigerating capacity of the water-cooling combined with fan is the highest but has the biggest power consumption.(3) The cooling water temperature has a great influence on the refrigeration performance of the system when adopting water-cooling and water-cooling combined with fan because the refrigeration performance would be more an more worse with higher cooling water temperature. Therefore, it is very important for water-cooling and water-cooling combined with fan to control the cooling water temperature.(4) Under high temperature conditions,The refrigerating capacity would be insufficient when the system adopts finned-cooler combined with fan. the refrigeration performance of the system adopting finned-cooler combined with fan is the lowest among the heat-dissipating methods.The refrigerating capacity of the system adopting water-cooling combined with fan has a limited enhancement for that of the system adopting merely water-cooling, but its refrigeration coefficient is lower than that of the latter because consume the power in addition. So, the thermoelectric refrigeration system adopting water-cooling is the optimum among the heat-dissipating methods in the hot end.