Calculation of the glass cover temperature and the top heat loss coefficient for 60° vee corrugated solar collectors with single glazing

Mahboub, Chawki; Moummi, Noureddine

doi:10.1016/j.solener.2011.11.019

Cited by 20 publications

(7 citation statements)

References 11 publications

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“…Figure 7 can be simplified in terms of the thermal resistance between the two sides (Figure 8). According to this simplified figure, empirical formulas for calculating the heat-loss coefficient at the top of the collector (U t ) are proposed as Equation ( 14) [38][39][40]. When the average temperature of the hot plate is between T a and 200 • C, the error of the formulas is no more than 0.3 W/m 2 K [41].…”

Section: Heat Loss Analysismentioning

confidence: 99%

Mathematical Modeling and Optimization of Vanadium-Titanium Black Ceramic Solar Collectors

Ding

Liu

2021

Energies

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The vanadium-titanium black ceramic (VTBC) coating on all-ceramic solar collectors has both high absorptance (0.94) and high emissivity (90%). However, the thermal conductivity of ceramic is very low (1.256 W/mK). To improve the heat collection efficiency of VTBC solar collectors, this paper establishes a mathematical model based on the energy-conservation relationships under steady-state conditions and creates a corresponding computer program. Key parameters for VTBC solar collectors include the heat-removal factor, effective transmittance-absorptance product for the absorber, total heat loss coefficient, etc. Then, via experimental testing, this study proposes a reference model for domestic VTBC solar collectors in a cold location (η = 0.89 − 2.20Tm*). Last, this work analyzes the influences of fin design and transparent cover design on VTBC solar collectors individually, using the created computer program. Results show that the most effective optimization method is to increase the transmittance of the transparent cover. By increasing the transmittance from 0.93 to 0.96, this study creates an optimized VTBC solar collector theoretical model (η = 0.92 − 2.20Tm*).

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Section: Heat Loss Analysismentioning

confidence: 99%

Mathematical Modeling and Optimization of Vanadium-Titanium Black Ceramic Solar Collectors

Ding

Liu

2021

Energies

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“…Mahboub and Moummi. [3] studied the energy analysis of a singleglass 60° vee corrugated solar collector. The iterative method is used to predict the top heat loss and the temperature of the glass cover, and the results of the top surface heat loss coefficient calculated by the model are compared.…”

Section: Heat-absorbing Plate Structurementioning

confidence: 99%

Research of flat plate solar air collector in drying

Long

2021

E3S Web Conf.

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Solar drying technology has been widely used in engineering fields such us chemical drying because of its low cost and low pollution advantages. In this review, the structural forms, materials and coatings of the heat-absorbing panels of flat plate solar air collector are classified, and the experimental and theoretical results of the performance level of the solar air flat panel collector are summarized. In indoor tests, the energy efficiency of flat plate solar air collector is 30% to 79%, and the energy efficiency of flat plate solar air collector in drying applications is 28% to 62%.

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“…In our laboratories, several theoretical and experimental investigations were carried out on the enhancement of thermal performances of SAHs designed for drying, heating and cooling applications [15][16][17][18][19][20][21][22]. In all these studies, the authors were used different form of obstacles mounted under the absorber plate on the air channel duct.…”

Section: Introductionmentioning

confidence: 99%

EXPERIMENTAL ANALYSIS OF HEAT TRANSFER IN THE FLOW CHANNEL DUCT OF SOLAR AIR HEATERS (SAHs)

Labed¹,

Moummi²,

Benchabane³

et al. 2015

IJHT

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This paper presents an experimental comparative study on the thermal performance and heat exchange of two single pass solar air heaters models (SAHs); we have proceeded to reversing the flow direction in the solar air heater. Initially, to determine the best performing model and to improve the efficiency factor of the SAH. Secondly, to evaluate the convective heat transfer coefficient of both models, named: N-1 and N-2. The indices (1) and (2) indicate, respectively, that the air was blown up or blown down in the channel duct of the SAH. Therefore, we have compared between the efficiencies, the convective heat transfer coefficient, Nusselt number curves and the distribution of air temperatures in the channel ducts of both solar air heaters. Both collectors were designed, constructed and tested in the University of Biskra (Algeria) in a stand facing south at an inclination angle equal to the local latitude. The results show that N-2 model (air blown down) is more efficient than N-1 model (air blown up), and the improvements in the heat exchange due to this technological solution are about 10-20%.

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Calculation of the glass cover temperature and the top heat loss coefficient for 60° vee corrugated solar collectors with single glazing

Cited by 20 publications

References 11 publications

Mathematical Modeling and Optimization of Vanadium-Titanium Black Ceramic Solar Collectors

Mathematical Modeling and Optimization of Vanadium-Titanium Black Ceramic Solar Collectors

Research of flat plate solar air collector in drying

EXPERIMENTAL ANALYSIS OF HEAT TRANSFER IN THE FLOW CHANNEL DUCT OF SOLAR AIR HEATERS (SAHs)

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