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Spray cooling has remained one of the highest heat flux removal schemes across various applications such as cooling power electronics, lasers, high power LEDs, servers, supercomputers etc. Researchers have been researching extensively to obtain the maximum heat transfer coefficient. The effects of different parameters of the spray cooling system have been studied in the past. The focus of the present...
In some particular circumstances, the air-cooling condenser must be adopted as the secondary cooler in the evaporative cooling system of large electrical equipments. For the cooling medium in the air-cooling condenser is the air and the distribution of temperature is uneven along the cooling tube, so it's necessary to do deep research on it. Experiments are carried out to study the heat transfer characteristics...
Based on the maximum CHF (critical heat flux) criterion, an optimal heat transfer criterion, which is called H criterion, was proposed. Experimental apparatuses were conducted. Distilled water was used as the working fluid. Three different DANFOSS nozzles with cone angles being 54deg, 50deg and 54deg respectively were used to cool a 30times30 mm2 square copper surface. Experimental results indicated...
In many liquid-cooled applications, the bulk temperature of the coolant, rather than the surface heat flux, limits the amount of cooling achieved. In such applications, the coolant flow path is often characterized by significant pressure losses, thus limiting the overall mass flow rate within the system. As a remedy, the idea of increasing the heat capacity of the cooling fluid by adding microencapsulated...
Immersion cooling of power electronic equipment can avoid device derating at elevated ambient temperatures and thereby increase power density. In this paper, a test bench is presented that can be used to characterize the heat transfer from fluid-immersed electrical components inside cylindrical volumes. Since the thermal properties of coolants are themselves temperature dependent and vary locally,...
This paper describes the design and testing of a two-channel 52-kW pulsed load. Its main feature is exceptionally low parasitic inductance, on the order of 200 nH. Such low inductance was needed in view of microsecond high-current pulses; it was realized by a compact design and careful layout. Small size is a prerequisite for minimizing the inductance; it was achieved by forced liquid cooling. Non-inductive...
During operation of the Large Hadron Collider at CERN, heat will be generated inside the coils of its superconducting magnets as a consequence of ramping of magnetic field, and of the interaction of lost beam particles with the magnet mass. Heat has to be transferred from the conductor into the He II coolant and removed from the magnet environment. During the LHC R&D stage, this transfer has been...
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