Operational characteristics of a top-heat-type long heat transport loop through a heat exchanger

Koito, Yasushi; Ahamed, Mohammad Shahed; Harada, Shunsuke; Imura, Hidefumi

doi:10.1016/j.applthermaleng.2008.02.024

Cited by 8 publications

(3 citation statements)

References 8 publications

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“…Duże obiegi z uwagi na koszt i względy ekologiczne uniemożliwiają wykorzystanie jako czynnika roboczego substancji chłodniczej. W tym przypadku rozwiązaniem jest zastosowanie wody, która jednak ze względu na dużą wartość podciśnienia w obiegu przy temperaturze pracy poniżej 100°C [10], sprawia wiele problemów [4].…”

Section: Wprowadzenieunclassified

Cykliczny termosyfon odwrócony o dwóch czynnikach roboczych

Duda¹,

Dobriański²,

Chludziński³

2014

ZN PRz Mechanika

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Section: Wprowadzenieunclassified

Cykliczny termosyfon odwrócony o dwóch czynnikach roboczych

Duda¹,

Dobriański²,

Chludziński³

2014

ZN PRz Mechanika

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“…In this solution, condensate does not have to be lifted. These types of thermosiphons have been widely studied [10][11][12][13][14]. Most of them rely on a single working medium, usually water or coolant.…”

Section: Introductionmentioning

confidence: 99%

A New Concept and a Test of a Bubble Pump System for Passive Heat Transport from Solar Collectors

Chludziński

Duda

2020

Energies

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Heat is usually transported by hydraulic circuits where the working medium is circulated by an electric pump. Heat can also be transferred by natural convection in passive systems. Passive systems where heat is transported downward have also been described and studied in the literature. These types of devices are referred to as reverse thermosiphons. However, systems of the type are not widely applied in practice due to the problems associated with the selection of the optimal working medium. In water-based thermosiphons, negative pressure is produced when water temperature falls below 100 °C, and non-condensable gas can enter the system. These problems are not encountered in systems where the working medium has a low boiling point. However, liquids with a low boiling point can be explosive, expensive, and harmful to the environment. The solution proposed in this paper combines the advantages of water and a liquid with a low boiling point. The described system relies on water as the heat transfer medium and small amounts of a substance with a low boiling point. The developed model was tested under laboratory conditions to validate the effectiveness of a passive system where heat is transported downward with the involvement of two working media. The system’s operating parameters are also described.

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“…In devices where saturated vapor pressure is used to the liquid lifting, a condition of the heat transfer strongly depends on the heat transport height and gets worse when the height increases. This problem is not so essential when heat transfer is realized horizontally [11] or a liquid heat carrier is used [12][13][14]. This paper presents the construction and principle of operation of a reverse thermosyphon with two working agents, where liquid transfers heat.…”

Section: Introductionmentioning

confidence: 99%

Analysis of the possibility of applications for a two-phase reverse thermosyphon in passive heat transport systems

2018

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Abstract. Devices called reverse thermosyphon enable passive heat transfer when the heat source is above the place of its receipt. This is often the case in solar installations for the preparation of hot water. The article concerns the determination of the possibility of using a two-phase inverted thermosyphon with two working factors in a passive downwards heat transport installation. The analysis was carried out on the basis of previous experimental studies. The height of the tested installation in one case was 1.5 m, in the second 18 m, at a heat load of 300, 600 and 900 W. Water and pentane was used as a working fluid inside the loop. Initial conclusions from the analysis confirm the possibility of using reverse thermosyphon with two working factors in the construction of a passive heat transport system.

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Operational characteristics of a top-heat-type long heat transport loop through a heat exchanger

Cited by 8 publications

References 8 publications

Cykliczny termosyfon odwrócony o dwóch czynnikach roboczych

Cykliczny termosyfon odwrócony o dwóch czynnikach roboczych

A New Concept and a Test of a Bubble Pump System for Passive Heat Transport from Solar Collectors

Analysis of the possibility of applications for a two-phase reverse thermosyphon in passive heat transport systems

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