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Personal-portable Cooling Garment Based on Adsorption Vacuum Membrane Evaporative CoolingYang, Yifan January 2011 (has links)
A cutting edge man-portable AVMEC cooling garment was demonstrated to be able to provide sufficient cooling for personnel working at mediate activity loads. Studies were first carried out in a well controlled vacuum desiccator at room temperature to elucidate the effects of several key parameters on the performance of an AVEC device, which was similar to AVMEC except that membrane was not involved. Under the best condition, an average cooling capacity of 179 W/M2 was achieved in a period of four hours and cooling continued at a slowly declining rate for another four hours afterward. The temperature of water was maintained at approximately 12.5 oC after the pseudo steady state was established. Then, it was shown that the AVMEC cooling pads were able to provide a cooling capacity of 277.4 W/m2 in a 37 oC ambient environment (incubator). The temperature of the cooling core surface was maintained in a range of 20 – 21.8 oC in the one-hour test period. No power supply was required except for the initialization stage, which took 5 minutes. Furthermore, human subject tests with or without wearing NWBC (Nuclear Warfare Biological and Chemical) suit demonstrated that, a AVMEC garment composed of 12 cooling pads were able to maintain the core body temperature of the subjects below 38.5 oC for up to 90 minutes while the subject was walking on a treadmill at a speed of 2 miles per hour in an environment of 40 oC and 50% RH (relative humidity). These results indicate that the AVMEC garment is a promising man-portable personal cooling technology.
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Film Cooling Experiments in a Medium Duration Blowdown FacilityKheniser, Issam E. 09 September 2010 (has links)
No description available.
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The effect of cooling milk over a surface cooler on flavor, cream line and evaporation lossLeach, Herbert Joseph. January 1933 (has links)
Call number: LD2668 .T4 1933 L41
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Passive thermal management of distribution grid assetsHesse, Danielle 07 January 2016 (has links)
This thesis presents a comprehensive study into the passive thermal management of high-voltage power electronics converters for use in augmented grid assets capable of performing power routing on the electricity grid. The work has focused on the thermal transport of single-phase closed thermosiphon systems incorporating a secondary parallel flow path for cooling an additional, typically smaller, thermal load associated with the power electronics converters. Dual-loop thermosiphon passive thermal management systems were incorporated into a grounded compact dynamic phase angle regulator (GCD-PAR) that aimed to facilitate power routing and reduce line losses on the power grid. The power router utilizes power electronics that reject heat to a planar area, or cold plate, which must be cooled by an entirely passive system to comply with the minimum 30 year mean time between failures (MTBF) consistent with grid reliability requirements. This design includes a secondary-loop cooling path that utilizes the cooling oil already present in the transformer to also cool the power router. An analytical multi-physics thermosiphon model is developed that couples existing fluid dynamic and heat transfer correlations to create a description of the steady state operation of a specific cylindrical 50 kVA transformer augmented with a thermosiphon. The model is validated experimentally and found to solve for steady state baseplate temperatures under maximum load within 2°C in 0.1 seconds. The model is then modified for a specific rectilinear 1 MVA transformer augmented with three thermosiphons. The 1 MVA model is validated experimentally and found to solve for steady state baseplate temperatures under maximum load within 4 °C in 0.2 seconds. The analytical model proves to be accurate and solve quickly with various geometric configurations and thermal loads.
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The development of air-cooling techniques for fast response pressure transducers in high temperature environmentsFerguson, Derek January 1997 (has links)
No description available.
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The development of an alternative refrigeration cycleHewitt, Neil James January 1990 (has links)
No description available.
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Thermal comfort for urban housing in BangladeshMallick, Fuad Hassan January 1994 (has links)
No description available.
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Linear and geometrically nonlinear analysis of shell structures by a shear flexible finite element shell formulationLam, Siu-Shu Eddie January 1988 (has links)
No description available.
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Self-induced flow circulation by enclosed rotorsDaneshmandi, Mohsen January 1995 (has links)
No description available.
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Evaporative cooling of caesium in a TOP trap : prospects for BECBance, Peter January 1998 (has links)
No description available.
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