Review of Thermosyphon Solar Water Heaters

Mertol, A.; Greif, R.

doi:10.1007/978-94-009-3631-7_28

Cited by 6 publications

(3 citation statements)

References 49 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…Thus, the TPCT charged with refrigerant is suitable for applications such as electrical cooling, permafrost de-icing and solar heating. 18,[42][43][44][45][46] As a result of the experiments, it appears that by replacing refrigerants with nanorefrigerants in TPCT, the performance of the aforementioned applications can be improved, which will have a significant influence on low-temperature applications. This fact leads to significant energy savings, something that has a positive environmental impact because it leads to CO 2 emissions avoidance.…”

Section: Resultsmentioning

confidence: 99%

Experimental investigation of a two-phase closed thermosyphon with Al₂O₃/R134a nanorefrigerant

Anand

Jawahar

Solomon

et al. 2022

Proceedings of the Institution of Mechanical Engineers, Part E:

View full text Add to dashboard Cite

Nanorefrigerants are mixtures of refrigerant and nanoparticles, which enhance the heat transfer in both air-conditioning and refrigeration systems. In the present work, the nanorefrigerant Al2O3/R134a is applied in a two-phase closed thermosyphon in order to investigate its thermal performance. More specifically, the influence of the Al2O3/R134a on the thermal resistance and heat transfer coefficient for various heat inputs in a two-phase closed thermosyphon were investigated experimentally. The two-phase closed thermosyphon was tested by varying the concentration of Al2O3 nanoparticles from 0.5% up to 1.5% by weight basis in the usual refrigerant R134a. The results of the experimental investigations indicate that there is a significant enhancement in heat transfer by 93.2% when the nanoparticle concentration of 1.0% was used in R134a when compared to the thermosyphon tested with pure R134a. The nanorefrigerant in thermosyphon has reduced its thermal resistance significantly by 59%. The heat transfer coefficient obtained for nanorefrigerants in two-phase closed thermosyphon is validated by Cooper correlation. It is inferred from the study that the depositions of nanoparticles in the thermosyphon enhance heat transfer. A new correlation to predict the rate of heat transfer is also proposed for employing the nanorefrigerants in a two-phase closed thermosyphon. The predicted correlation, heat transfer coefficient and thermal resistance are optimized by using Grey Relation analysis by computing the grade between the minimum and maximum values obtained from the experimental results.

show abstract

Section: Resultsmentioning

confidence: 99%

Experimental investigation of a two-phase closed thermosyphon with Al₂O₃/R134a nanorefrigerant

Anand

Jawahar

Solomon

et al. 2022

Proceedings of the Institution of Mechanical Engineers, Part E:

View full text Add to dashboard Cite

show abstract

“…The Pool Unit can be configured to perform this type of R&D by inserting electrical heaters on the flat portion of pool. A few general reviews on natural circulation can be found in Japikse, 42 Zvirin, 43 Mertol and Greif, 44 Mertol and Greif, 45 and Greif. 46 Some of the many experimental studies can be found reported in Alstad et al, 47 Agarwal, Alam, and Gopalakrishna, 48 Huang and Zelaya, 49 Loomis and Soda, 50 Ardron and Krishnan, 51 and Bau and Torrance.…”

Section: Pumping Systemsmentioning

confidence: 99%

Idaho National Laboratory Lead or Lead-Bismuth Eutectic (LBE) Test Facility - R&D Requirements, Design Criteria, Design Concept, and Concept Guidance

Loewen¹,

Demkowicz²

2005

View full text Add to dashboard Cite

SUMMARYThe Idaho National Laboratory Lead-Bismuth Eutectic Test Facility will advance the state of nuclear technology relative to heavy-metal coolants (primarily Pb and Pb-Bi), thereby allowing the U.S. to maintain the pre-eminent position in overseas markets and a future domestic market. The end results will be a better qualitative understanding and quantitative measure of the thermal physics and chemistry conditions in the molten metal systems for varied flow conditions (single and multiphase), flow regime transitions, heat input methods, pumping requirements for varied conditions and geometries, and corrosion performance. Furthering INL knowledge in these areas is crucial to sustaining a competitive global position.This fundamental heavy-metal research supports the National Energy Policy Development Group's stated need for energy systems to support electrical generation.

show abstract

“…Grief (1988) discussed a number of representative works and programs on natural circulation loops [2]. Other reviews on similar topics had been given by Metrol et al (1981) [3], Probert (1982, 1986) [4][5] and Grief (1985, 1987) [6][7]. Chato (1963) investigated a parallel-channel system of vertical tubes between two constant-temperature reservoirs.…”

Section: Introductionmentioning

confidence: 99%

Natural Circulation in a PWR for a Sinusoidal Heat Input: Analytical Model

Abdulrahman¹

2022

Proceedings of the 8th World Congress on Mechanical, Chemical, and Material Engineering

View full text Add to dashboard Cite

Natural circulation is a crucial passive heat removal process for all light water reactors. To understand the consequences of decreasing primary coolant inventory on natural circulation, an analytical one-dimensional model has been developed for a sinusoidal input heat distribution, based on solutions to the continuity, momentum and energy equations and expressions for the natural circulation parameters have been derived for PWR plant. The model encompasses all potential types of natural circulation (single-phase, combined single and two-phase, and two-phase). In this paper, it is found that the transition between the different modes of natural circulation with various system inventories is smooth. As the flow mode changes from single-phase (100% mass inventory) to two-phase natural circulation, the loop mass flow rate increases and exhibits a peak within a narrow band of inventory (usually between 60-80%). Also, it is demonstrated that natural circulation in a PWR type system can provide an effective mechanism for the rejection of core decay heat to the secondary over a primary coolant inventory range of 100 to 60%, and a core decay power range of 1.5 to 5% of full power. Comparisons are made between pervious experimental results and prior research and the analytical outcomes are found to be in reasonable accord.

show abstract

Review of Thermosyphon Solar Water Heaters

Cited by 6 publications

References 49 publications

Experimental investigation of a two-phase closed thermosyphon with Al₂O₃/R134a nanorefrigerant

Experimental investigation of a two-phase closed thermosyphon with Al₂O₃/R134a nanorefrigerant

Idaho National Laboratory Lead or Lead-Bismuth Eutectic (LBE) Test Facility - R&D Requirements, Design Criteria, Design Concept, and Concept Guidance

Natural Circulation in a PWR for a Sinusoidal Heat Input: Analytical Model

Contact Info

Product

Resources

About

Review of Thermosyphon Solar Water Heaters

Cited by 6 publications

References 49 publications

Experimental investigation of a two-phase closed thermosyphon with Al2O3/R134a nanorefrigerant

Experimental investigation of a two-phase closed thermosyphon with Al2O3/R134a nanorefrigerant

Idaho National Laboratory Lead or Lead-Bismuth Eutectic (LBE) Test Facility - R&D Requirements, Design Criteria, Design Concept, and Concept Guidance

Natural Circulation in a PWR for a Sinusoidal Heat Input: Analytical Model

Contact Info

Product

Resources

About

Experimental investigation of a two-phase closed thermosyphon with Al₂O₃/R134a nanorefrigerant

Experimental investigation of a two-phase closed thermosyphon with Al₂O₃/R134a nanorefrigerant