Optimal Structure Design of a Thermosyphon Solar Water Heating System with Thermal and Dynamic Models

Lu, Longsheng; Wang, Xiaowu; Wang, Shuai; Liu, Xiaokang

doi:10.1080/01457632.2017.1379347

Cited by 14 publications

(7 citation statements)

References 19 publications

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“…Fig. 7d shows the comparison of the model‐predicted plate temperature of a TSWH with the experimental counterparts of Lu et al 29 for A c = 1.79 m 2 , N t = 8, D = 0.0068 m, a collector insulation thickness of 0.04 m, a copper absorber plate thickness of 0.0003 m, a plate inclination angle of 27°, a tank volume of 150 L, and at 9:00 to 17:00 h on a clear day. The RMSE of the model‐predicted temperatures was 8.3 °C with an absolute error of ±15.26 °C.…”

Section: Resultsmentioning

confidence: 99%

“…TSWH model validation for (a) the collector outlet temperature, (b) the tank temperature, (c) the collector outlet temperature and efficiency with different collector inlet temperatures, and (d) the plate temperature corresponding to their experimental counterparts by (a) Garg and Gupta 26, (b) Zerrouki et al 27, (c) Zelzouli et al 28, and Lu et al 29, respectively, at the solar peak hours.…”

Section: Resultsmentioning

confidence: 99%

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Design and Simulation of a Low‐Temperature Thermal Desalination System

Karmakar,

Patra,

Saha

et al. 2023

Chem Eng & Technol

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The prototype of a low‐temperature thermal desalination system treating 2500 L day−1 of saline water was designed thermally and geometrically, to be integrated with a vacuum spray flash drum and spray nozzles, a plate heat exchanger‐type condenser, and a thermosyphon solar water heater to produce potable water for a small community. The design bases were the feed flow rate, the feed temperature from 45 to 65 °C, the salinity of 0.035 kg kg−1, and the vacuum drum pressure from 2 to 6 kPa absolute. The estimated yield of potable water based on the simulated droplet dynamics was in the range of 68.91–75.80 %. The plate heat exchanger and the thermosyphon solar water heater were designed for effective condensation and passive heating, respectively.

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Section: Resultsmentioning

confidence: 99%

Section: Resultsmentioning

confidence: 99%

Design and Simulation of a Low‐Temperature Thermal Desalination System

Karmakar,

Patra,

Saha

et al. 2023

Chem Eng & Technol

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“…During the last few decades, many research studies have been carried out to investigate the performance of thermosyphonbased water heating systems (Budihardjo et al, 2007;Kalogirou, 2009;Liu et al, 2012;Dobson and Ruppersberg, 2017). (Lu et al, 2017) developed numerical models based on heat and momentum balance equations to estimate the performance of a thermosyphon water heating system. The developed models were also validated by experimental testing of solar water heaters operating under natural circulation.…”

Section: Introductionmentioning

confidence: 99%

Experimental Investigation of a Medium Temperature Single-Phase Thermosyphon in an Evacuated Tube Receiver Coupled With Compound Parabolic Concentrator

et al. 2021

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The integration of evacuated tube receivers with non-imaging compound parabolic concentrators (CPCs) operating in thermosyphon mode provides the opportunity to deliver solar thermal energy in the medium temperature range that is suitable for many industrial applications. However, the performance of single-phase thermosyphon in the medium temperature range has not been comprehensively investigated. This paper presents the design, development, and performance evaluation of a single-phase thermosyphon in an evacuated tube receiver integrated with a modified CPC solar collector. The thermohydraulic performance of the developed system is evaluated in the tropical climate using Therminol-55 oil as heat transfer fluid. The results demonstrate that the maximum outlet temperature reached over 120°C using thermal oil as heat transfer fluid while it remained at 100°C in case of water. The zero-loss thermal efficiency reached up to 70% on a clear sky day. Comparing the thermal performance of the developed CPC collector with an existing model of a non-concentrating collector showed much improvement at elevated temperatures. This indicates that this system can effectively operate in tropical weather conditions to provide sustainable solar thermal energy in the medium temperature range.

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“…Thermosyphons and natural circulation loops have been widely used by researchers because of their applications in heat exchangers, electronics cooling devices, solar collectors and many other industrial installations (Ramezanizadeh et al , 2019; Lu et al , 2018; Matsubara et al , 2019; Ghaddar, 1998). Various research studies have dedicated to investigating natural convection flows in circulation loops.…”

Section: Introductionmentioning

confidence: 99%

Effects of magnetic field on the liquid gallium thermosyphon fluid flow; a numerical study

Teimouri

Behzadmehr

2019

HFF

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Purpose This paper aims to numerically study the laminar natural convection in a thermosyphon filled with liquid gallium exposed to a constant magnetic field. The left wall of the thermosyphon is at an uniformed hot temperature, whereas the right wall is at a uniform cold temperature. The top and bottom walls are considered to be adiabatic. All walls are electrically insulated. The effects of Hartmann number, in a wide range of Rayleigh number and aspect ratio combinations, on the natural convection throughout the thermosyphon, are investigated and discussed. Furthermore, different forces that influence the natural flow structure are studied. Design/methodology/approach A Fortran code is developed based on the finite volume method to solve the two-dimensional unsteady governing equations. Findings Imposing a magnetic field improves the stability of the fluid flow and thus reduces the Nusselt number. For a given Hartmann and Rayleigh number, there is an optimum aspect ratio for which the average velocity becomes maximum. Research limitations/implications This paper is a two-dimensional investigation. Originality/value To the best of the authors’ knowledge, the effect of the magnetic field on natural convection of liquid gallium in the considered thermosyphon has not been studied numerically in detail. The results of this paper would be helpful in considering the application of the low Prandtl number’s liquid metals in thermosyphon MHD generators and certain cooling devices.

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Optimal Structure Design of a Thermosyphon Solar Water Heating System with Thermal and Dynamic Models

Cited by 14 publications

References 19 publications

Design and Simulation of a Low‐Temperature Thermal Desalination System

Design and Simulation of a Low‐Temperature Thermal Desalination System

Experimental Investigation of a Medium Temperature Single-Phase Thermosyphon in an Evacuated Tube Receiver Coupled With Compound Parabolic Concentrator

Effects of magnetic field on the liquid gallium thermosyphon fluid flow; a numerical study

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