Applications of the Heat Pipe

Dunn, P.D.

doi:10.1016/b978-0-08-029355-4.50013-9

Cited by 6 publications

(7 citation statements)

References 12 publications

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“…Heat pipes consist of a sealed container with a small amount of working fluid. The heat is transferred as latent heat energy by evaporating the working fluid in a heating zone and condensing the vapour in a cooling zone, the circulation is completed by return flow of the condensate to the heating zone through the capillary structure which lines the inner wall of the container [14,15]. The FPC system consisted of two K420-EM2L flat plate collectors each with a gross area of 2.…”

Section: System Descriptionmentioning

confidence: 99%

Validated TRNSYS model for forced circulation solar water heating systems with flat plate and heat pipe evacuated tube collectors

Ayompe¹,

Duffy²,

McCormack³

et al. 2011

Applied Thermal Engineering

143

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a b s t r a c tThis paper presents a validated TRNSYS model for forced circulation solar water heating systems used in temperate climates. The systems consist of two flat plate collectors (FPC) and a heat pipe evacuated tube collector (ETC) as well as identical auxiliary components. The systems were fitted with an automated unit that controlled the immersion heaters and hot water demand profile to mimic hot water usage in a typical European domestic dwelling. The main component of the TRNSYS model was the Type 73 FPC or Type 538 ETC. A comparison of modelled and measured data resulted in percentage mean absolute errors for collector outlet temperature, heat collected by the collectors and heat delivered to the load of 16.9%, 14.1% and 6.9% for the FPC system and 18.4%, 16.8% and 7.6% for the ETC system respectively. The model underestimated the collector outlet fluid temperature by À9.6% and overestimated the heat collected and heat delivered to load by 7.6% and 6.9% for the FPC system. The model overestimated all three parameters by 13.7%, 12.4% and 7.6% for the ETC system. Q1

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Section: System Descriptionmentioning

confidence: 99%

Validated TRNSYS model for forced circulation solar water heating systems with flat plate and heat pipe evacuated tube collectors

Ayompe¹,

Duffy²,

McCormack³

et al. 2011

Applied Thermal Engineering

143

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“…This operation can be carried out with a working fluid such as water, which absorbs latent heat and evaporates in the hot part of the pipe (evaporator section), then condenses in the cool region to release the latent heat (condenser section). A heat pipe is simply a tube closed at one end and can be charged by the working fluid, occupying 5-30% of the volume of the pipe, [1,2]. As a result, a twophase gas-liquid flow inside a heat pipe is prevailed.…”

Section: Introductionmentioning

confidence: 99%

Experimental Investigation of an Evacuated Tube Heat Pipe Solar Collector Using Different Fluids

Al-azmi

Sakr

Abdelatif

et al. 2022

Engineering Research Journal - Faculty of Engineering (Shoubra)

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In the current work, the effect of four different fluids ethylene glycol, ethanol, methanol, and acetone as well as their aqua solutions on the performance of the thermosyphon evacuated tube heat pipe solar collector is investigated. Water is used as a heat transfer fluid with a volume flow rate of 1.95 l/min. Five modules each of three evacuated tube heat pipe solar collectors are used. The thermosyphon heat pipes are manufactured and charged with each working fluid and its aqua solution of volume concentration of 0, 0.25, 0.5, 0.75 and 1.0 respectively. The performance of the systems is illustrated by the solar collector efficiency and the overall system efficiency. The results showed that pure water gives higher solar collector efficiencies than that of ethylene glycol, ethanol, methanol, and their solutions while acetone gives higher solar collector efficiency than the pure water. Correlation equations for solar collector efficiency in terms of (Tm-T)/G and concentration are deduced. The current results are validated with the previously experimental published correlations. η 𝑠 System efficiency THPECT Thermosyphon Heap Pipe Evacuated Tube Collector

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“…Введение. Система, состоящая из замкнутой тепловой трубки и запорных клапанов, является эффективной системой теплообмена нового типа, в которой тепло переносится от испарителя к конденсатору за счет осцилляций рабочей жидкости, перемещающейся по трубке [1]. В системах такого типа большое значение имеет внутренний диаметр трубки, который должен быть не очень большим, так чтобы при эксплуатации могли формироваться "жидкие снаряды" и паровые пробки.…”

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“…Видно, что при увеличении L e с 50 до 150 мм тепловое сопротивление незначительно уменьшается. Это может быть обусловлено тем, что при наибольшей длине L e режим кипения близок к режиму кипения в большом объеме, т. е. кипение происходит при меньшей удельной мощности теплового потока [1]. В то же время при малых значениях L e режим кипения близок к режиму кипения в ограниченном канале, которое происходит при большой удельной мощности теплового потока.…”

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Thermal Performance of a Top Heat Mode Closed-Loop Oscillating Heat Pipe with a Check Valve (THMCLOHP/CV)

2015

PMTF

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Applications of the Heat Pipe

Cited by 6 publications

References 12 publications

Validated TRNSYS model for forced circulation solar water heating systems with flat plate and heat pipe evacuated tube collectors

Validated TRNSYS model for forced circulation solar water heating systems with flat plate and heat pipe evacuated tube collectors

Experimental Investigation of an Evacuated Tube Heat Pipe Solar Collector Using Different Fluids

Thermal Performance of a Top Heat Mode Closed-Loop Oscillating Heat Pipe with a Check Valve (THMCLOHP/CV)

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