Detailed Loop Model (DLM) analysis of liquid solar thermosiphons with heat exchangers

Mertol, A.; Place, Wayne; Webster, Tom; Greif, R.

doi:10.1016/0038-092x(81)90002-5

Cited by 87 publications

(21 citation statements)

References 27 publications

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“…Other experimental results from Huang [5J in4icate that the performance of a low-resistance thermosyphon is insensitive to tank elevation. This result is also consistent with the theoretical predictions of Mertol et al [6] for systems with heat exchangers. Therefore, lowering the tank relative to the collector to mitigate the structural/aesthetic problem may not seriously affect performance, as long as reverse flow at night can be suppressed.…”

Section: Introductionsupporting

confidence: 82%

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Experimental evaluation of solar thermosyphons with heat exchangers

et al. 1987

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In keeping with the national energy policy goal of fostering an adequate supply of energy at a reasonable cost, the United States Department of Energy (DOE) supports a variety of programs to promote a balanced and mixed energy resource system. The mission of the DOE Solar Buildings Research and Development Program is to support this goal, by providing for the develop-o ment of solar technology alternatives for the buildings sector. It is the goal of the program to establish: a proven technology base to allow industry to develop solar products and designs for buildings which are economically competitive and can contribute significantly to building energy supplies nationally.· Toward this:. end; the program. sponsors research actiYities'. related to increasing~.the efficiency, reducing-the cost; and improving:the long-term durability of passive and active solar systems{or build,ing·water and space heating, cooling, and daylighting applica". tions. These activities are conducted in four major areas: Advanced Passive Solar Materials Research, Collector Technology Research, Cooling Systems Research, and Systems Analysis and Applications Research. Advanced Passive Solar MaterialsResearch. This activity area includes work on new aperture materials for controlling solar heat gains, and for enhancing the use of daylight for building interior lighting purposes. lt also encompasses work on lowocost thermal storage materials that have high thermal . . storage capacity. and can. be. integrated with conven tiona! building elements, and work on materials and methods to transport thermal energy efficiently between any. building exterior surface,and the building interior by nonmechanical means. Collector· TechnologyResearch. This activity area encompasses work on advanced low-to-. medium temperature (up to 180 • F useful operating temperature) fiat plate collectors for water and space heating applications, and medium-: to-high temperature (up to 400 • F useful operating· temperature) evacuated tube/concentrating collectors· for space heating and cooling applications. The focus is on design innovations using new materials and fabrication techniques.Cooling Systems Research. This activity area involves research on high performance dehumidifiers and chillers that can operate efficiently with the variable thermal outputs and delivery temperatures associated with solar collectors. It also includes work on advanced passive cooling techniques. Systems Analysis and Applications·Research. This activity area encompasses experimental test• ing; analysis; and evaluation of solar heating·, cooling,· and daylighting systems for residential and nonresidential buildings. Th'is· involves<; system integration studies, the~ development of. design and analysis tools, and the establishment of overall cost, performance, and durability targets:f or'various ctechnolo·gy or"system ·\o·ptibns.This report is an account of research conducted in SystemsAnalysis and Applications concerning experimental testing of solar thermosyphons for residential hot water...

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Section: Introductionsupporting

confidence: 82%

“…Experimental Evaluation of Solar Thermosyphons some of these studies, are provided in a previous paper by the authors [6]. The previous paper also presents results of computer simulations of a solar thermosyphon system with heat exchanger in the storage tank and propylene glycol working fluid in the collector loop.…”

Section: Introductionmentioning

confidence: 99%

Experimental evaluation of solar thermosyphons with heat exchangers

et al. 1987

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“…Two-dimensional studies (Mertol et al 1982) have confirmed the essential features of the one-dimensional analysis-which nevertheless does not provide quantitative agreement with experiment. Similar ideas have been extended to study the performance of solar heating systems (Huang 1980;Mertol et al 1981). Subsequently, Sen et al (1985) showed that the Navier-Stokes equations for the thermosiphoning loop could be approximated by the three Lorenz (1963) equations derived from the study of instabilities in convective flow with confining walls, which in tum enabled numerical characterisation of the onset of chaotic flows.…”

Section: Convection-an Overviewmentioning

confidence: 96%

Heat Transport in Liquid Filled Tubes

Schmid¹,

Pailthorpe²,

Collins³

1986

Aust. J. Phys.

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When heat is applied to a liquid filled tube, the liquid moves under buoyancy forces which arise from density variations. In long thin tubes, inclined at. an angle to the horizontal, two counter-flowing streams of liquid are observed which extend over virtually the whole length. A simple one-dimensional model is developed in which an analysis of heat flows into and between the two streams is made. This is used to predict the temperature in the system and the average fluid velocities at any point in the tube. The results of the model are in good agreement with experimental measurements on these tubular systems, and on a planar convection cell. Systems such as this can exhibit very large effective thermal conductances, and may be useful as a heat extraction device in evacuated tubular solar collectors.

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“…Many of these applications are related to space technology (El-Genk and Tournier, 2004;Elliot et al, 2003;Gibson et al, 2013; http://dx.doi.org/10.1016/j.anucene.2015.05.026 0306-4549/Ó 2015 Elsevier Ltd. All rights reserved. Walker et al, 2013;Wright et al, 2005), thermal storage (Caruso et al, 1989;Zalba et al, 2003), solar energy (Chien et al, 2011;Mathioulakis and Belessiotis, 2002;Mertol et al, 1981), cooling of gas turbine and electronic devices (Japikse, 1973).…”

Section: Introductionmentioning

confidence: 99%

Investigation of a long term passive cooling system using two-phase thermosyphon loops for the nuclear reactor spent fuel pool

et al. 2015

Annals of Nuclear Energy

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Detailed Loop Model (DLM) analysis of liquid solar thermosiphons with heat exchangers

Cited by 87 publications

References 27 publications

Experimental evaluation of solar thermosyphons with heat exchangers

Experimental evaluation of solar thermosyphons with heat exchangers

Heat Transport in Liquid Filled Tubes

Investigation of a long term passive cooling system using two-phase thermosyphon loops for the nuclear reactor spent fuel pool

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