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Showing 1 to 14 of 14 for “"Thermosyphon"”.
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THERMOSYPHON FLOODING IN REDUCED GRAVITY ENVIRONMENTS
An innovative experiment to study the thermosyphon flooding limits was designed and flown on a parabolic flight campaign to achieve the Reduced Gravity Environments (RGE) needed to obtain empirical data for analysis. Current correlation models of Faghri and Tien and Chung do not agree with the …
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Modeling the Transient Response of a Thermosyphon
Thermosyphon transient operation was numerically modeled. The numerical model presented in this work overcame the limitations of previous studies by including transient conduction in the vessel wall, shear stress between the rising vapor and the falling film in the thermosyphon, the influence of …
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Experimental and Numerical Study of Dual-Chamber Thermosyphon
… important phenomena occurring in a dual-chamber thermosyphon. Boiling experiments were carried out using water at sub-atmospheric pressures of 9.7, 15 and 21 kPa with a three-dimensional porous boiling enhancement structure integrated in the evaporator. Sub-atmospheric pressure boiling achieved …
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Two-phase closed thermosyphon with two-fluid mixtures.
… the performance of stationary two-phase closed thermosyphons with two-fluid mixtures. Three mixtures were used as the working fluids: (1) water-ethanol, (2) water-ethyleneglycol and (3) water-glycerol. The results are presented to show the effects of ratio of two fluid component, mean operating …
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Thermosyphon-cooled axial gap electric motors for ship propulsion applications
Thesis (Ph. D.)--Massachusetts Institute of Technology, Dept. of Ocean Engineering, 1995.
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State Feedback Control of a Single-Loop Thermosyphon System Via a Quotient Controller
… to stabilize a chaotic flow in a single loop thermosyphon system with a high heat index. The thermosyphon loop is heated from below and cooled from above, which causes time-dependent chaotic flow when the external heat index is above a threshold value. Our goal was to stabilize the fluid into …
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Experimental Investigation and CFD Modelling of a Thermosyphon-equipped Heat Exchanger used in Low-grade Waste Heat Recovery
… heat pipes, also known as two-phase closed thermosyphons, lack a sintered wick structure within and are therefore easier to manufacture in large quantities making them ideal heat sinks in macroscopic applications such as industrial waste heat recovery.<br/><br/>The subject of this work is …
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Evaluation of local heat transfer and friction factors in a U-type compound parabolic collector operating as a thermosyphon
… factors in an XCPC absorber tube operating as a thermosyphon. The local Nusselt numbers and local friction factors were obtained numerically. It was found that the heat transfer coefficient and friction factors vary significantly downstream of the tube inlet and alter near the U-bend of the …
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Hybrid solar thermoelectric systems utilizing thermosyphons for bottoming cycles
… solar thermoelectric (HSTE) system which uses a thermosyphon to passively and efficiently transfer heat to a bottoming cycle for various applications including residential hot water heating, solar air conditioning, chemical drying, and aluminum smelting. The concept utilizes a parabolic trough …
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Simulation of a solar water heating system
… radiation was measured using a solarimeter and thermosyphon mass flow rates were measured using a thermistor inserted into the flow circuit. Close correlation was obtained between predicted and experimental results. Daily efficiencies varied according to the times and quantities of hot water …
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Design and manufacture of low cost vaccine cooler
… peanut oil as its working fluid, to create a thermosyphon type heat transfer device with a safety shutoff to prevent freezing. The prototype was manufactured and tested. It was found that with the proper amount of working fluid, it is possible to run the cooling loop at 4°C and pull heat from …
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Computer simulation and optimisation of solar heating systems for Cyprus
… models of the TRNSYS programme. They concern thermosyphon solar water heating systems, active solar water heating systems, solar space heating systems, combined solar water and space heating systems and solar assisted heat pump systems for space and water heating. These models are used to …
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Latent Heat Thermal Energy Storage with Embedded Heat Pipes for Concentrating Solar Power Applications
… embedding gravity-assisted wickless heat pipes (thermosyphons) within a commercial-scale LHTES system is explored through use of a thermal network model. A new design is proposed for charging and discharging a large-scale LHTES system. The size and cost of the LHTES system is estimated and …
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Experimental Investigation and Validation of Boiling and Condensation Thermal Resistances in Cylindrical Thermosyphons and Screen-Wick Heat Pipes.
Thermosyphons (TS) and heat pipes (HP) are passive two-phase thermal transport devices capable of transferring high heat loads with small temperature differences in thermal management applications. This thesis aims to improve the design-stage prediction of TS and HP performance, where device …