Experimental Study on Thermal Performance of a Loop Heat Pipe with Different Working Wick Materials

Htoo, Kyaw Zin; Huynh, Phuoc; Kariya, Keishi; Miyara, Akio

doi:10.3390/en14092453

Cited by 7 publications

(2 citation statements)

References 25 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…The smaller the uncertainty value, the more accurate and precise the research result [18]. Uncertainty calculation on heat pipe thermal performance has been conducted on the parameters of temperature, pressure, coolant flow rate, and heat load by observing random and systematic uncertainties [19,20]. Evaluation of temperature measurement uncertainty can be done by comparing the read between a standard thermometer and a calibrated thermometer, then measured using the regression equation [21].…”

Section: Introductionmentioning

confidence: 99%

Untitled

2022

Jurnal Polimesin

View full text Add to dashboard Cite

To improve safety and normal operation aspects to be more economical, the NuScale type power reactor has the potential to be added passive cooling system technology. The technology is a loop heat pipe (LHP) with a wick made of a collection of capillary tubes. To determine the thermal performance of the LHP technology properly, the supporting analysis was needed before the experiment is carried out. One of the necessary supporting factors were to know the accuracy of measuring the temperature distribution on the LHP. The objective of this study was to determine the value of the uncertainty of the thermocouple used in the LHP experiment. By knowing the accuracy of the measurement of the temperature distribution, it is hoped that the resulting data is good and accurate. Data measurement was carried out using the National Instruments data acquisition system. The temperature distribution data retrieval was carried out under the condition that the LHP was in a steady state at the temperature of the hot water as the source of the LHP temperature of 35˚C, 45˚C, 55˚C, and 65˚C. Data collection was carried out within approximately 10 hours of the LHP experiment. The recorded temperature distribution data is then compared with temperature data using a well calibrated derived standard thermocouple. The calculation of the uncertainty value is carried out by statistical methods commonly used to determine the uncertainty of the temperature distribution measurement. The measurement results show that the average temperature value obtained is within the range of the standard uncertainty values of the thermocouple used. The uncertainty value obtained at all measurement points on variations in hot water temperature have value below the standard uncertainty value of the derived standard thermocouple used, which is 0.1°C. Based on these results, it can be concluded that the thermocouple used in the LHP experiment is feasible and has very good accuracy so that it can produce accurate and good LHP temperature distribution data.

show abstract

Section: Introductionmentioning

confidence: 99%

Untitled

2022

Jurnal Polimesin

View full text Add to dashboard Cite

show abstract

“…Besides, effects of some factors like heat sinks temperature, slope angle and heat transfer with ambient were experimentally investigated by Chernysheva et al 7 . In the studies 8,9 Huynh and HToo et al conducted the investigation thermal performance of a water LHP with flat-rectangular evaporator. This loop heat pipe can maintain the electronics temperature is not higher then 124 o C at the heat load of 244 W when functioning horizontally.…”

Section: Introductionmentioning

confidence: 99%

Experimental study on thermal performance of ethanol loop heat pipe with flat evaporator under gravity – assisted condition

Huynh

Vo²,

Phan³

et al. 2021

Sci.Tech.Dev.J.-Eng.Tech.

View full text Add to dashboard Cite

Nowadays, extreme growing of telecommunication and information technology causes the significant changes in the electronics belonging to the high-performance computer, data centers that are miniaturizing in their size and increasing the heat power dissipation. As a result, it is important to study on new cooling methods rather than conventional air cooling to warrant electronic device operate durably and stably. Besides, saving electricity power consumed by cooling systems is another considerable concern. Loop heat pipe, a passive heat transfer device which functions based on phase change processes and natural forces like gravity or capillary force, has been being one of potential solutions for the above challenges. In this paper, a loop heat pipe with flat evaporator was fabricated to investigate its cooling characteristics during start-up, stable operating period at different heat loads under gravity–assisted condition. This loop heat pipe was charged with ethanol whereas sintered stainless steel wick was the capillary structure. Time for successful start-up shortened from 13 minutes to 4 minutes as heat load increased from 30 W to 225 W. When heating power supplied to loop heat pipe’s evaporator was adjusted from 30 W to 400 W (14.8 W/cm2), the heating block surface’s temperature increased from 33oC to 133oC. This temperature could be maintained below 85oC, electronics limitation temperature in industry, if heat power released from the heating block is smaller than 220 W (8.14 W/cm2). Besides, the change of different types of thermal resistance such as total thermal resistance, evaporator and condenser thermal resistances with heating power is discussed detail in this paper.

show abstract

Design, fabrication and characterization of porous ceramics secondary wick of a loop heat pipe to reduce heat leakage

Xiong

Wang

2023

International Communications in Heat and Mass Transfer

View full text Add to dashboard Cite

Experimental Study on Thermal Performance of a Loop Heat Pipe with Different Working Wick Materials

Cited by 7 publications

References 25 publications

Untitled

Untitled

Experimental study on thermal performance of ethanol loop heat pipe with flat evaporator under gravity – assisted condition

Design, fabrication and characterization of porous ceramics secondary wick of a loop heat pipe to reduce heat leakage

Contact Info

Product

Resources

About