Thermal performance of a solar cooker based on an evacuated tube solar collector with a PCM storage unit

Sharma, Susmita; Iwata, Takeshi; Kumakura, Hiroaki; Sagara, Kazunobu

doi:10.1016/j.solener.2004.08.001

Cited by 262 publications

(75 citation statements)

References 14 publications

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“…Phase change materials (PCMs), which release or absorb thermal energy during melting and solidification processes, are believed to have outstanding capability to store a massive amount of heat efficiently during their phase change processes [1,2]. PCMs have been investigated in building applications [3][4][5][6], industrial waste heat recovery [7], solar collectors [8], solar power plants [9], high-efficient compact heat sinks [10], solar cookers [11,12] and solar stills [13]. Thermal stability investigations of PCMs have been conducted through implementing repeated thermal cycle tests [14,15].…”

Section: Introductionmentioning

confidence: 99%

A numerical investigation of heat transfer in phase change materials (PCMs) embedded in porous metals

YiShui

Zhao

2011

Energy

428

124

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The effects of metal foams on heat transfer enhancement in Phase Change Materials (PCMs) are investigated. The numerical investigation is based on the two-equation non-equilibrium heat transfer model, in which the coupled heat conduction and natural convection are considered at phase transition and liquid zones. The numerical results are validated by experimental data. The main findings of the investigation are that heat conduction rate is increased significantly by using metal foams, due to their high thermal conductivities, and that natural convection is suppressed owing to the large flow resistance in metal foams. In spite of this suppression caused by metal foams, the overall heat transfer performance is improved when metal foams are embedded into PCM; this implies that the enhancement of heat conduction offsets or exceeds the natural convection loss. The results indicate that for different metal foam samples, heat transfer rate can be further increased by using metal foams with smaller porosities and bigger pore densities. Keywords:Heat transfer enhancement; PCM; Metal foam; Thermal storage; Volume-averaged method; Non-thermal-equilibrium model.

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Section: Introductionmentioning

confidence: 99%

A numerical investigation of heat transfer in phase change materials (PCMs) embedded in porous metals

YiShui

Zhao

2011

Energy

428

124

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“…Sharma et al (2004) utilized two pyranometers to measure the solar irradiance on an evacuated tube solar collector; they report an accuracy of 1.5% for a pyranometer inclined at 20° to the horizontal, and an accuracy of 2.5% for another measuring the irradiance on a horizontal surface.…”

Section: Solar Energy Measurementmentioning

confidence: 99%

Measurement of the Efficiency of Evacuated Tube Solar Collectors Under Various Operating Conditions

Zubriski¹,

Dick

2012

Journal of Green Building

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“…Therefore in order to achieve the stable water heating system, the auxiliary heat source, i.e., electric heater, LPG, thermal storage unit was added into the system (Assilzadeh et al, 2005;Sharma et al, 2005). In Thailand, biomass is the alternative renewable energy.…”

Section: Introductionmentioning

confidence: 99%

Computational Study of Hybrid Water Heater with Evacuated Glass Tube Solar Collector and Rice Husk Combustion

Charoensawan¹,

Wannagosit²

2010

Energy Research J.

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Problem statement:The thermal performance modeling of hybrid water heater with evacuated glass tube solar collector and flue gas of rice husk combustion was developed. The solar global radiation and ambient air temperature data used in the system modeling belongs Phitsanulok province from 7 am-5 pm in the summer season. Approach: The system can be divided into two parts, i.e., evacuated glass tube thermosyphon solar collector and thermosyphon heat exchanger with flue gas of rice husk combustion. The evacuated glass tube was a coaxial double-layer tube made of Borosilicate. Its outer tube diameter and inner tube diameter were 58 and 47 mm respectively. The inside cavity of evacuated glass tube holed thermosyphon which was made of copper tube and filled with R134a at the filling ratio of 70% of evaporator volume. For latter, the temperature and flow rate of flue gas that was released from the cyclone furnace and used as a heat source of heat exchanger were constant at 150°C and 50 m 3 min −1 . The heat exchanger was consisted of array of thermosyphon which was made of stainless steel tube and filled with distilled water at 50% filling ratio of evaporator volume. Results: The effects of various parameters on the system performance were computational analyzed. The hybrid water heater system with optimum design of both thermal performance and economic can be obtained and produce the hot water at the temperature exceeding 70°C and the flow rate of 1 m 3 day −1 . Conclusion: The thermal performance of this optimum hybrid water heater system was investigated along the time of the day in summer.

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Thermal performance of a solar cooker based on an evacuated tube solar collector with a PCM storage unit

Cited by 262 publications

References 14 publications

A numerical investigation of heat transfer in phase change materials (PCMs) embedded in porous metals

A numerical investigation of heat transfer in phase change materials (PCMs) embedded in porous metals

Measurement of the Efficiency of Evacuated Tube Solar Collectors Under Various Operating Conditions

Computational Study of Hybrid Water Heater with Evacuated Glass Tube Solar Collector and Rice Husk Combustion

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