Simulated energy and exergy analyses of the charging of an oil–pebble bed thermal energy storage system for a solar cooker

Mawire, Ashmore; McPherson, M.; Heetkamp, R.R.J. van den

doi:10.1016/j.solmat.2008.07.019

Cited by 52 publications

(21 citation statements)

References 34 publications

(30 reference statements)

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“…This is primarily achieved by increasing mass flow rate, which can be seen in Fig. 7; similar results have been presented by Dincer (2008, 2009) and by Mawire et al (2008). However, the increase in mass flow rate clearly results in higher pressure drop and thus, higher exergy destroyed due to viscous effects.…”

Section: Effect Of Varying Operation Modesupporting

confidence: 83%

“…In fact, the utility of exergy methods are becoming more widely recognized in recent years. There have been many studies that utilize exergy analysis for TES performance evaluation, including PCM systems Fellah, 1995, 1996;Koca et al, 2008;Kousksou et al, 2007;Ramayya and Ramesh, 1998;Shabgard et al, 2012;, sensible heat storage Mawire et al, 2008;Rosen et al, 1988;Rosen, 2001), and thermochemical systems (Dincer and Rosen, 2002;Kreetz and Lovegrove, 2002;Lovegrove et al, 1999). However, there exists a wide range of approaches, and some have concluded that a standard convention is required in order to fairly assess TES performance (Dincer and Rosen, 2002;Rosen, 1992; Rosen and Dincer, 2003).…”

Section: Introductionmentioning

confidence: 99%

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Exergetic optimization and performance evaluation of multi-phase thermal energy storage systems

et al. 2015

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This study outlines a methodology for modeling and optimizing multi-phase thermal energy storage systems for solar thermal power plant (STPP) operation by incorporating energy and exergy analyses to a TES system employing a storage medium that can undergo multi-phase operation during the charging and discharging period. First, a numerical model is developed to investigate the transient thermodynamic and heat transfer characteristics of the storage system by coupling conservation of energy with an equation of state to model the spatial and temporal variations in fluid properties during the entire working cycle of the TES tank. Second, parametric studies are conducted to determine the impact of key design parameters on both energy and exergy efficiencies. The optimal values must balance exergy destroyed due to heat transfer and exergy destroyed due to pressure losses, which have competing effects. Optimization is utilized to determine parameter values within a feasible design window, which leads to a maximum exergetic efficiency of 87%.

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Section: Effect Of Varying Operation Modesupporting

confidence: 83%

Section: Introductionmentioning

confidence: 99%

Exergetic optimization and performance evaluation of multi-phase thermal energy storage systems

et al. 2015

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“…Mawire et al [4] introduced the energy balance equations to model a solar energy capture (SEC) system and a thermal energy storage (TES) system for an indirect parabolic solar cooker. An oil-pebble bed is used as the TES material.…”

Section: Brief Literature Reviewmentioning

confidence: 99%

Modeling, testing, and parametric analysis of a parabolic solar cooking system with heat storage for indoor cooking

Mbodji

Hajji

2017

Energ Sustain Soc

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Background: In an ever-changing world where needs increase daily due to economic growth and demographic progression, where prices are unstable, where reserves are running out, where climate change is topical, the energy issues are increasingly marked by the question of sustainability. In many developing countries, wood and subsidized butane are the main sources of energy used for cooking in households. The use of solar energy in domestic cooking becomes unavoidable. Several models of solar cookers have been proposed, but most of them dealt with box and oven types of solar cookers without storage. Methods: This paper presents a dynamic thermodynamic model of a parabolic solar cooking system (PSCS) with heat storage, along with a comparison of the model solution with experimental measurements. The model uses various thermal resistances to take into account heat transfer between the different parts of the system. Results: The first experimental setup consists of a parabolic concentrator (0.80-m diameter and 0.08-m depth) and a 1.57-l cylindrical receiver. The second experimental setup is composed of a parabolic concentrator (1.40-m diameter and 0.16-m depth), the same receiver, and a 6.64-l heat storage. Tests were carried out in Rabat, Morocco, between April 24 and July 10, 2014, and between May 15 and June 18, 2015. Synthetic oil is used as a transfer fluid and a sensible heat storage. Conclusions:Comparison between predicted and measured temperatures shows a good agreement with a relative error of ± 4.4%. The effects of important system design and operating parameters were also analyzed. The results show that a 50 W m −2 increase of the daily maximum solar radiation increases the storage temperature by 4°C and a 5% increase of the receiver reflectance or absorptance improves the maximum storage temperature by 3.6 and 3. 9°C, respectively. Optimizing the aspect ratio of the receiver to 2 gives a maximum storage temperature of 85°C. Increasing the thermal fluid mass flow rate from 0 to 18 kg h −1 , or the receiver thermal insulation from 0.01 to 0. 08 m, increases the maximum storage temperature by 65 and 17°C, respectively.

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“…A portable solar cooker and water heater using a parabolic concentrator, shown in Figure 14.5, was designed by Badran et al (2010). Mawire et al (2008) proposed a solar cooker using a parabolic dish concentrator that could operate both in the direct and the indirect modes with an oil/ pebble bed TES system. An umbrella type of parabolic dish concentrator that uses oil TES material was designed by Chandra et al (2013) to heat the oil that was in thermal contact with the cooking surface.…”

Section: Direct-focusing Solar Cookers Using Hctesmentioning

confidence: 99%

“…Two designs of indirect solar cookers that can also be used in the direct mode using parabolic concentrators have been discussed previously (Mawire et al, 2008;Mussard and Nydal, 2013a). Two designs of indirect solar cookers that can also be used in the direct mode using parabolic concentrators have been discussed previously (Mawire et al, 2008;Mussard and Nydal, 2013a).…”

Section: Pressure Cooker Insulationmentioning

confidence: 99%

Solar Thermal Energy Storage for Solar Cookers

Mawire

2015

Solar Energy Storage

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Simulated energy and exergy analyses of the charging of an oil–pebble bed thermal energy storage system for a solar cooker

Cited by 52 publications

References 34 publications

Exergetic optimization and performance evaluation of multi-phase thermal energy storage systems

Exergetic optimization and performance evaluation of multi-phase thermal energy storage systems

Modeling, testing, and parametric analysis of a parabolic solar cooking system with heat storage for indoor cooking

Solar Thermal Energy Storage for Solar Cookers

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