Research on the refrigerant column height in the downcomer of a two-phase loop thermosyphon

Cao, Hanwen; Ding, Tao; He, Zhiguang; Li, Zhen

doi:10.1016/j.ijrefrig.2018.07.011

Cited by 29 publications

(6 citation statements)

References 25 publications

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“…When the working conditions (filling ratio and heating temperature) changes, the refrigerant distribution and flow patterns in the TPLT system could be different. According to the existing research [8,9], the operation state could be summarized as three stages.…”

Section: Operation Stages Of a Tplt Systemmentioning

confidence: 99%

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A new idea of the flow model applied to a two-phase loop thermosyphon

Cao,

Ding,

et al. 2021

Preprint

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Section: Operation Stages Of a Tplt Systemmentioning

confidence: 99%

“…Tong [7] studied the flow characteristics of a TPLT system which used the R744 coolant. Cao [8] investigated the regulation of the refrigerant column height in downcomer through a numerical simulation. The flow characteristics of the TPLT is special because it is deeply affected by the gravity.…”

Section: Introductionmentioning

confidence: 99%

A new idea of the flow model applied to a two-phase loop thermosyphon

Cao,

Ding,

et al. 2021

Preprint

Self Cite

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“…They noticed that a low operating temperature makes for a high heat transfer capacity . Cao et al 20 noticed that in the loop thermosyphon, the downcomer shows a high refrigerant column height (pipe section below the condenser) and occupies the part condenser, which ultimately decreases the performance of the thermosyphon.…”

Section: Introductionmentioning

confidence: 99%

Experimental investigation of the loop thermosyphon with different adiabatic lengths charged with different working fluids

Birajdar

Sewatkar²

2021

Heat Trans

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This paper reports an experimental investigation of a closed‐loop thermosyphon system charged with water and other low saturation fluids, such as ethanol, acetone, and methanol, for different adiabatic lengths, filling ratios, and heat loads. The closed‐loop thermosyphon with two inline vertical heaters in the evaporator section and forced air‐cooled plate‐type heat exchanger in the condenser section, connected by a changeable adiabatic length, is investigated at different working conditions. Out of five filling ratios used in the analysis, at 0.6 filling ratio, the loop thermosyphon is seen to be operated at its best. The acetone‐charged loop thermosyphon shows the lowest values (up to 72% reduction) of overall thermal resistance than that of other fluids and significantly higher effectiveness, due to the plate‐type forced air‐cooled condenser. For the acetone‐filled thermosyphon, an almost 15% increase in the effectiveness is observed by changing the adiabatic length from 800 to 200 mm. This study suggests that the limitation of the loop thermosyphon with a water‐cooled condenser to cool electronic components, computational clusters, and data centers is well fulfilled by the loop thermosyphon with plate‐type forced air‐cooled condenser. The nucleate pool boiling correlation is developed and validated for the loop thermosyphon system to determine the evaporator heat transfer coefficient.

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“…In some cases, it may even cause the two-phase flow instabilities in the heat pipe with temperature fluctuations. 23,24 Due to the heat pipe dimensions and low circulation flow rates, flow patterns and fluid distribution in largescale heat pipes differ from those in conventional ones. 25,26 It is necessary to get a deeper insight into the filling ratio effects on the thermal performance of the separate heat pipe.…”

Section: Introductionmentioning

confidence: 99%

Modeling and numerical investigation on the effects of filling ratio in a large separate heat pipe loop

Kuang

Wang

2021

Intl J of Energy Research

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Large separate heat pipe is a potential selection to establish the passive cooling system to remove decay heat from the Spent Fuel Pool. In this system, heat pipes are expected to work properly and effectively for a long time without human intervention. Due to the physical dimensions and structures, flow patterns, and fluid distribution in large-scale heat pipes differ from those in conventional ones. Based on the condensation flow patterns, a flow condensation model is presented. Then, a separate heat pipe model considering filling ratio effects is developed. Using the new model, the mean absolute errors of simulation are 5.5% (water), 5.1% (ammonia), and 4.3% (R134a). While in the conventional condensation model, these errors are 29.4%, 9.7%, and 10%. It is found

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Research on the refrigerant column height in the downcomer of a two-phase loop thermosyphon

Cited by 29 publications

References 25 publications

A new idea of the flow model applied to a two-phase loop thermosyphon

A new idea of the flow model applied to a two-phase loop thermosyphon

Experimental investigation of the loop thermosyphon with different adiabatic lengths charged with different working fluids

Modeling and numerical investigation on the effects of filling ratio in a large separate heat pipe loop

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