Heat pipes application to solar energy systems

Khairnasov, Sergii; Naumova, Alyona

doi:10.3103/s0003701x16010060

Cited by 30 publications

(6 citation statements)

References 29 publications

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“…The use of an HTF, typically molten salt, has been shown to be highly effective in terms of enhanced heat transfer rate to the materials and end-product recovery; however, this necessitates more highly specialized equipment [38]. In the case of indirect feedstock heating and no HTF, performance has been shown to improve drastically when appropriate additional mechanisms to enhance heat transfer rates are implemented [37][38][39][40]. In the directly heated concept, the materials are heated directly via concentrated solar radiation through, at minimum, one transparent reactor surface.…”

Section: Solar-powered Pyrolysismentioning

confidence: 99%

SPEAR (Solar Pyrolysis Energy Access Reactor): Theoretical Design and Evaluation of a Small-Scale Low-Cost Pyrolysis Unit for Implementation in Rural Communities

Caputo

Mašek

2021

Energies

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Energy access and waste management are two of the most pressing developmental and environmental issues on a global level to help mitigate the accelerating impacts of climate change. They are particularly relevant in Sub–Saharan Africa where electrification rates are significantly below global averages and rural areas are lacking a formal waste management sector. This paper explores the potential of integrating solar energy into a biomass pyrolysis unit as a potentially synergetic solution to both issues. The full design of a slow pyrolysis batch reactor targeted at biochar production, following a strict cost minimization approach, is presented in light of the relevant considerations. SPEAR is powered using a Cassegrain optics parabolic dish system, integrated into the reactor via a manual tracking system and optically optimized with a Monte-Carlo ray tracing methodology. The design approach employed has led to the development an overall cost efficient system, with the potential to achieve optical efficiencies up 72% under a 1.5° tracking error. The outputs of the system are biochar and electricity, to be used for soil amendment and energy access purposes, respectively. There is potential to pyrolyze a number of agricultural waste streams for the region, producing at least 5 kg of biochar per unit per day depending on the feedstock employed. Financial assessment of SPEAR yields a positive Net Present Value (NPV) in nearly all scenarios evaluated and a reasonable competitiveness with small scale solar for electrification objectives. Finally, SPEAR presents important positive social and environmental externalities and should be feasibly implementable in the region in the near term.

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Section: Solar-powered Pyrolysismentioning

confidence: 99%

SPEAR (Solar Pyrolysis Energy Access Reactor): Theoretical Design and Evaluation of a Small-Scale Low-Cost Pyrolysis Unit for Implementation in Rural Communities

Caputo

Mašek

2021

Energies

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“…Accordingly, the thermosyphon has been developed and implemented for the use of renewable energy sources, heat recuperation of small-grade heat energy and refrigeration equipment. The solar heating of building [3], extraction of geothermal energy for power generation [4,5], solar thermal appliances [6], cooling application turbine blade and transformer [7,8] are the best examples. Thermosyphons are composed of two parts, the first part called a condenser section and the evaporator section is the second part, at the time with the adiabatic section between the condenser section and evaporator section.…”

Section: Introductionmentioning

confidence: 99%

Experimental Investigation of Thermosyphon Thermal Performance Using Different Filling Ratio

Farge¹,

Ismael²,

M.Thyab³

2021

ETJ

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The present work investigated the thermal performance of thermosyphon by using distilled water as a working fluid at different filling ratios (50%, 60%, and 70 %). The thermosyphon was manufactured from a copper tube with outer and inner diameters (26 and 24) mm, respectively. The thermosyphon was tested experimentally at different input power (100, 200 and 300) Watt. The operating temperature of the oil was chosen below 85°C. Experimental results revealed that the filling ratio of 60% exhibited the best heat dissipation at the highest operating temperature. While the low operating temperature and 50 % filling ratio show better heat dissipation. Further, it was found that the thermal resistance of the thermosyphon was obviously decreased with increasing the input power. The percentage decrease in the thermal resistance of the thermosyphon at a filling ratio of 0.6 was 14.6 % compared with that filling ratio of 0.5 at an input power of 300 W.

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“…One tool that has high flux carrying capacity and effectivity is a heat pipe [16], [17]. Heat pipe is a passive device that has excellent heat transfer properties and high efficiency [18]. Heat pipes are widely used in the electronics industry, for example, batteries [19].…”

Section: Introductionmentioning

confidence: 99%

Investigation on the Use Solar Thermoelectric Generator for Open Pond Cultivation with Heat Pipe Cooling

Hakim¹,

Putra²,

Ananda

2020

EngJ

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At present, most aquaculture ponds get a supply of dissolved oxygen from pumps or aerators that use electricity. Whereas in some places, farmers still experience infrastructure problems such as roads, ports, and electricity. Generally, the cultivation pond water level is 0.3-0.5ha, which can be rectangular or square. The large surface area of this pond has the potential to be utilized by its solar power. The thermoelectric module utilizes the Seebeck effect where if there is a heat difference between the two sides there will be an electric potential. The sun's heat can still be raised again by using a concentrator. Thermoelectric modules can produce electricity due to temperature differences on both sides. In aquaculture ponds, there is a lot of water that can be used to cool the thermoelectrics. One tool that can be used to deliver heat quickly is a heat pipe. Heat pipe is a passive device that has excellent heat transfer properties and high efficiency. In this research, heat pipes will be used as heat transfer media to cool the thermoelectric cold side. From the testing that has been done, the maximum voltage of the thermoelectric module is 3.77V obtained from a temperature difference of 67.57 °C.

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Heat pipes application to solar energy systems

Cited by 30 publications

References 29 publications

SPEAR (Solar Pyrolysis Energy Access Reactor): Theoretical Design and Evaluation of a Small-Scale Low-Cost Pyrolysis Unit for Implementation in Rural Communities

SPEAR (Solar Pyrolysis Energy Access Reactor): Theoretical Design and Evaluation of a Small-Scale Low-Cost Pyrolysis Unit for Implementation in Rural Communities

Experimental Investigation of Thermosyphon Thermal Performance Using Different Filling Ratio

Investigation on the Use Solar Thermoelectric Generator for Open Pond Cultivation with Heat Pipe Cooling

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