Energy and exergy analysis of a new solar air heater with latent storage energy

Bouadila, Salwa; Lazaar, Mariem; Skouri, Safa; Kooli, Sami; Farhat, Abdelhamid

doi:10.1016/j.ijhydene.2014.04.074

Cited by 88 publications

(19 citation statements)

References 22 publications

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“…Hence, it is possible to maintain higher outlet air temperatures during off sunshine hours. The latent heat storage materials such as paraffin and hytherm oil, shape-stabilized phase change materials and inorganic salts were used in FCSAH [14][15][16]. The use of latent heat storage materials in solar air heaters would require additional space in the absorber plate for storage.…”

Section: Introductionmentioning

confidence: 99%

Thermodynamic performance of forced convection solar air heaters using pin–fin absorber plate packed with latent heat storage materials

Kumar

Babu²,

Mohanraj

2016

J Therm Anal Calorim

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In this work, the thermodynamic performance of a forced convection solar air heater (FCSAH) was evaluated using two different absorber plate configurations, namely a flat absorber plate and a pin-fin absorber plate packed with latent heat storage material (paraffin wax). The experiments were carried out under the meteorological conditions of Coimbatore city in India. The parameters such as outlet air temperature, thermo-hydraulic efficiency and exergy efficiency were evaluated with reference to solar intensity, ambient temperature and ambient wind velocity. An artificial neural network (ANN) model was developed to simulate the thermodynamic performance of a FCSAH using flat absorber plate and pin-fin absorber plate packed with paraffin wax to have a realistic performance comparison. The ANN-predicted results are found to be closer to the experimental values with a maximum fraction of absolute variance, minimum root-mean-square errors and minimum coefficient of variance. The results showed that the pin-fin absorber plate packed with paraffin wax has additional heat storage for the period of 3 h with 2-5°C enhanced outlet air temperature when compared to the flat absorber plate. The FCSAH using pin-fin absorber plate packed with paraffin wax has 3-35 % higher thermo-hydraulic efficiency with 2-15 % higher exergy efficiency when compared to the flat absorber plate. The results confirmed that pin-fin absorber plate packed with paraffin is a good option to enhance the thermodynamic performance of a FCSAH.

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Section: Introductionmentioning

confidence: 99%

Thermodynamic performance of forced convection solar air heaters using pin–fin absorber plate packed with latent heat storage materials

Kumar

Babu²,

Mohanraj

2016

J Therm Anal Calorim

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“…The stored exergy is composed of discharging process for the charging and discharging state and can be conveyed as 26 Ex dis ¼ 2 6 6 6 6 6 6 4 3 7 7 7 7 7 7 5 ,…”

Section: B Exergy Analysis Of the Sahmentioning

confidence: 99%

Energy, exergy, and cost analyses of a double-glazed solar air heater using phase change material

Edalatpour

Kianifar

Aryana

et al. 2016

Journal of Renewable and Sustainable Energy

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In this paper, a double-glazed solar air heater (SAH) using paraffin wax as phase change material (PCM) was designed, fabricated, and tested under the climatic condition of Mashhad, Iran (latitude, 37 28 0 N and longitude, 57 20 0 E) during three typical days in the summer. The PCM stores solar radiation of the sun as latent and sensible heat during daytime and then restores such stored energy during the night. Exploitation of both first and second laws of Thermodynamics, the energy and exergy efficiencies of this system are assessed. According to the experiments undertaken, it is found that the daily energy efficiency of the system varies between 58.33% and 68.77%, whereas the daily exergy efficiency varies from 14.45% to 26.34%. Eventually, the economic analysis shows that the cost of 1 kg of heated air utilizing double-glazed SAH would be 0.0036$.

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“…Besides the conventional SAH, there are some new SAH con gurations with an absorber made of porous media or having storage bed to improve their thermal performance [1,2].…”

Section: Introductionmentioning

confidence: 99%

Comparative Study of the Effect of Two Type of Ribs on Thermal Performance of Solar Air Heaters

2017

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Abstract. This paper aims to analyze uid ow characteristics and heat transfer augmentation in the air duct of a solar air heater using CFD techniques. The air duct has a rectangular section, the top wall is the glazing and the bottom one is the absorber provided with transverse rectangular or squared ribs. The simulations are performed in the turbulent regime and RANS formulation is used to model the ow and resolve mass, momentum, and energy equations using Finite Volumes method. The air ow analysis shows that the velocity pro le is not disturbed by the ribs outside the laminar sublayer. Heat transfer analysis based on the calculation of Nusselt Number, friction factor, and thermo-hydraulic performance highlights the heat transfer enhancement and no big friction losses are recorded. A comparative study between two rib shapes (square and rectangular) is performed, which shows better thermohydraulic performance of the rectangular ribs.

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Energy and exergy analysis of a new solar air heater with latent storage energy

Cited by 88 publications

References 22 publications

Thermodynamic performance of forced convection solar air heaters using pin–fin absorber plate packed with latent heat storage materials

Thermodynamic performance of forced convection solar air heaters using pin–fin absorber plate packed with latent heat storage materials

Energy, exergy, and cost analyses of a double-glazed solar air heater using phase change material

Comparative Study of the Effect of Two Type of Ribs on Thermal Performance of Solar Air Heaters

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