Assessment of three types of heat pipe solar collectors

Azad, E.

doi:10.1016/j.rser.2012.02.001

Cited by 52 publications

(22 citation statements)

References 10 publications

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“…When heat is supplied to the absorber plate it causes the working fluid to vaporize and the vapor to move to the condenser where it condensed on the tubes. The condensate is returned to the evaporator by gravity, Azad (2012). The advantages of this type of heat exchanger is it occupied less area; hence, it absorbs more energy, and according an investigation performed by Azad (2008a) fulfills the optimum ratio of evaporator to condenser length ratio (Le-evaporator length and Lc-condenser length), Fig.…”

Section: 1b Type (Ii) Axial Heat Pipe Solar Collectormentioning

confidence: 99%

Applications of Heat Pipes to Energy Systems at Irost

Azad¹

2017

Frontiers in Heat Pipes

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The paper presents a review of the research on heat pipes and their applications to energy systems at Iranian Research Organization for Science and Technology. A description of the heat pipes is presented followed by a classification of them as "axial" and "co-axial". In the following sections, applications of both heat pipe types in solar collectors, heat recovery systems and power plant cooling are presented.

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Section: 1b Type (Ii) Axial Heat Pipe Solar Collectormentioning

confidence: 99%

Applications of Heat Pipes to Energy Systems at Irost

Azad¹

2017

Frontiers in Heat Pipes

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“…In traditional solar thermal systems, round copper heat pipes are applied to the solar heat collectors [5][6][7]; however, this type of heat pipe is not a desired solution due to its high weight, small surface-volume ratio, and large size [8]. A novel micro flat aluminium heat pipe array (MF-AHPA) [9] provides a promising method for significantly improving solar heat collection due to its high in-plane thermal conductivity, high reliability, strength, and relatively low cost.…”

Section: Introductionmentioning

confidence: 99%

Thermal Characterisation of Micro Flat Aluminium Heat Pipe Arrays by Varying Working Fluid and Inclination Angle

et al. 2018

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Featured Application: solar collector; solar thermal system; thermal energy storage system; heat exchanger.Abstract: A micro heat pipe array is desirable owing to its high heat transfer capacity, compact size, and high surface-volume ratio compared with conventional heat pipes. In this study, micro flat aluminium heat pipe arrays (MF-AHPA) were developed and systematically characterised by varying working fluid and inclination angle. Three MF-AHPAs with different working fluids, i.e., acetone, cyclopentane, and n-hexane, were fabricated. The acetone MF-AHPA achieved the best thermal performance. The underlying mechanism is the small flow viscous friction and small shearing force of liquid vapour. Additionally, the experimental results show a strong dependence of MF-AHPAs' thermal resistance on the orientation due to the gravitational effect on axial liquid distribution. Finally, a criterion is proposed to determine the optimal inclination angle of the MF-AHPA. In the present study, a volumetric fraction (α a,c ) of 74 ± 7% has been shown to well predict an optimal inclination angle of the MF-AHPAs with various working fluids and heat loads.

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“…Busato et al [8] made a research of a multisource heat pump system, which included evaluation and analysis of the data obtained through real time monitoring of the working system in operation, for a period of approximately two heating seasons. Azad [9] tested three different types of heat pipe flat plate collectors (HP-FPC), and compared their instantaneous efficiency. Xiao et al [10] efficiency open heat pipe evacuated tubular solar collector.…”

Section: Introductionmentioning

confidence: 99%

A heat pipe solar collector system for winter heating in Zhengzhou city, China

et al. 2017

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A heat pipe solar collector system for winter heating is investigated both experimentally and theoretically. The hourly heat collecting capacity, water temperature and contribution rate of solar collector system based on Zhengzhou city typical sunshine are calculated. The study reveals that the heat collecting capacity and water temperature increases initially and then decreases, and the solar collector system can provide from 40% to 78% heating load for a 200 m 2 villa with in Zhengzhou city from November to March.

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Assessment of three types of heat pipe solar collectors

Cited by 52 publications

References 10 publications

Applications of Heat Pipes to Energy Systems at Irost

Applications of Heat Pipes to Energy Systems at Irost

Thermal Characterisation of Micro Flat Aluminium Heat Pipe Arrays by Varying Working Fluid and Inclination Angle

A heat pipe solar collector system for winter heating in Zhengzhou city, China

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