Investigation of a small scale double-reflector solar concentrating system with high temperature heat storage

Foong, Chee Woh; Nydal, Ole Jørgen; Løvseth, Jørgen

doi:10.1016/j.applthermaleng.2011.02.026

Cited by 48 publications

(26 citation statements)

References 12 publications

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“…All other walls are kept adiabatic during charging process. PCM is a eutectic blend of sodium nitrate (NaNO 3 ) and potassium nitrate (KNO 3 ) in 60:40 percent molar ratio (mol%) with melting temperature of 220°C [41,42]. The thermophysical properties of PCM and other components of LHTES system are listed in Table 2.…”

Section: Physical Modelmentioning

confidence: 99%

Three-dimensional simulation of high temperature latent heat thermal energy storage system assisted by finned heat pipes

Tiari

Qiu

2015

Energy Conversion and Management

114

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Section: Physical Modelmentioning

confidence: 99%

Three-dimensional simulation of high temperature latent heat thermal energy storage system assisted by finned heat pipes

Tiari

Qiu

2015

Energy Conversion and Management

114

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“…For computational simplicity, the latent heat has described in terms of an effective heat capacity in a narrow temperature range of melting (Foong et al, 2011). 1.6 220 …”

Section: 1phase Change Materialsmentioning

confidence: 99%

Steam-based charging-discharging of a PCM heat storage

Tesfay¹,

Kahsay²,

Nydal³

2018

mejs

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Latent heat storage and efficient heat transport technology helps to utilize the intermittent solar energy for continuous and near isothermal applications. However, many latent heat storages face challenges of storage charging, heat retaining, and discharging the stored heat. This paper tries to address the challenges of heat transportation and storage charging-discharging issues. The heat transportation from the receiver over some distance, from outside to the kitchen, is carried out with a stainless pipeline and water as heat transfer fluids. However, the charging-discharging process is carried by conduction method with the help of fins. In addition, the stored heat is retained for about one-two days by using aerogel insulation. The latent heat is stored in a phase change material (PCM), nitrate salt (mixture of 60%NaNO3 and 40%KNO3), which melts at 222ºC and has 109 J/g specific heat of fusion. The storage has the capacity of storing up to 250ºC heat and supply this heat isothermally during baking in the liquid-solid phase transition. However, the sensible heat stored in the solid and liquid form of the PCM is used to perform additional applications that do not require uniform heat which includes bread baking, kita (large pancake) baking and water boiling. The low thermal conductivity of PCM is enhanced by using extended aluminum fins that are attached to the baking plate and extruded inward to the storage. In this paper, two-phase loop thermosyphon of steam is used to manage the long distance heat transportation required between the receiver (outside) and the storage (inside a house). The steam in the thermosyphon flow has restricted to a maximum working temperature of 250ºC. Steam is selected for its highest heat capacity, availability and stable nature. It carries heat from the collector focus point and condenses in a coiled pipe imbedded in aluminum plate placed on top of the storage. Many fins are solidly attached to this plate to conduct the heat down to the PCM inside the storage during charging. This design configuration avoids pressure development inside the PCM storage and the charging-discharging temperature is recorded in three zones (top, middle and bottom) of the storage. The experimental and numerical results show that the heat transportation, retention and charging-discharging methods are effective.

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“…However, the success of solar cooking in household applications is possible only if the energy for cooking is made available even during non-sunshine hours. Therefore, solar cookers require energy storage to provide energy during the night and overcast periods [12][13][14][15][16][17][18][19]. The collective information on solar cookers with energy storage system has been presented [20,21].…”

Section: Introductionmentioning

confidence: 98%

Performance assessment of a solar domestic cooking unit integrated with thermal energy storage system

Kumaresan

Vigneswaran

Esakkimuthu³

et al. 2016

Journal of Energy Storage

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Investigation of a small scale double-reflector solar concentrating system with high temperature heat storage

Cited by 48 publications

References 12 publications

Three-dimensional simulation of high temperature latent heat thermal energy storage system assisted by finned heat pipes

Three-dimensional simulation of high temperature latent heat thermal energy storage system assisted by finned heat pipes

Steam-based charging-discharging of a PCM heat storage

Performance assessment of a solar domestic cooking unit integrated with thermal energy storage system

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