A non-linear flat-plate collector model

Cooper, P.I.; Dunkle, R. V.

doi:10.1016/0038-092x(81)90076-1

Cited by 47 publications

(17 citation statements)

References 2 publications

Supporting

Mentioning

Contrasting

Unclassified

Order By: Relevance

“…The elimination of Qu(β) implied that (To − Ti) = 0, which caused the absorber plate not to have significant temperature changes through the raising tubes. Also, the Joule effect controlled by PID allows us to achieve lower uncertainty, but in Case 1 the greatest contribution of uncertainty continues to be the uncertainty of Figure 7 shows a comparison of UL(β)/UL(90°) vs. β for Case 1 (Qu(β) > 0), considering that Ut ≈ UL, according Duffie and Beckman [3] and Cooper et al [8], to calculate Ut. The Hollands correlation [23] was used to calculate the Nussetl number in both methods.…”

Section: Effect Of the Parametersmentioning

confidence: 99%

“…The U L (0) could only be increased up to 1.8% of the value of U L (90), from the highest to lowest values of (T i − T a )/G at β = 0. Figure 7 shows a comparison of UL(β)/UL(90°) vs. β for Case 1 (Qu(β) > 0), considering that Ut ≈ UL, according Duffie and Beckman [3] and Cooper et al [8], to calculate Ut. The Hollands correlation [23] was used to calculate the Nussetl number in both methods.…”

Section: Effect Of the Parametersmentioning

confidence: 99%

“…Among the research models, previous works have also proposed an overall heat loss coefficient and experimental generalized correlations as complements to determine the solar collector's efficiency [6][7][8][9]. However, these proposed models generally use a fixed inclination with respect to the N-S horizontal axis, according to the latitude of the evaluation place [10,11], thereby disregarding the fact that the second and third coefficients of the efficiency curve are functions of the U L .…”

Section: Introductionmentioning

confidence: 99%

See 2 more Smart Citations

The Effect of the Angle of Inclination on the Efficiency in a Medium-Temperature Flat Plate Solar Collector

Orlando

Flores-Prieto

2017

Energies

View full text Add to dashboard Cite

Abstract:In this experimental work, the effects of the inclination angle β and the (T i − T a )/G on the efficiency and the U L -value were investigated on a medium-temperature flat plate solar collector. The experiments were based on steady-state energy balance, by heat flow calorimetry at indoor conditions and considering the standard American National Standard Institute/American Society of Heating Refrigerating and Air Conditioning Engineers (ANSI/ASHRAE) 93-2010. The solar radiation was emulated by the Joule effect using a proportional integral derivative (PID) control considering two conditions of the absorber temperature, Case 1: ) vs. β were 8.0% at the horizontal position for Case 1, while for Case 2, the maximum change was 1.8% only. Therefore, the changes of the inclination angle cause significant variations of the convective flow patterns within the collector, which leads to considerable variation of the collector efficiency and its U L value.

show abstract

Section: Effect Of the Parametersmentioning

confidence: 99%

Section: Effect Of the Parametersmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

See 1 more Smart Citation

The Effect of the Angle of Inclination on the Efficiency in a Medium-Temperature Flat Plate Solar Collector

Orlando

Flores-Prieto

2017

Energies

View full text Add to dashboard Cite

show abstract

“…Pflug et al [78] extended the standard efficiency curve of Cooper and Dunkle [79] to account also for the losses to the building interior. A comparison with a validated detailed physical BIST model showed that the collector gain can be correctly calculated.…”

Section: Bi Solar Thermalmentioning

confidence: 99%

Modelling and simulation of Building-Integrated solar thermal systems: Behaviour of the system

Lamnatou

Mondol

Chemisana

et al. 2015

Renewable and Sustainable Energy Reviews

View full text Add to dashboard Cite

“…In addition, the equivalent heat transfer coefficient between the plate and the cover, h p-c , was calculated for β = 0° and compared to Hollands & Buchberg solutions, respectively, [22][23][24]. The function of the overall heat loss coefficient, U L , was examined and compared to the Cooper and Dunkle assumption [25,26]. Moreover, the collector's operation was examined not only in horizontal position but also for 15°, 30°, and 45° inclination angle for 30 °C inlet water temperature.…”

Section: Introductionmentioning

confidence: 99%

Thermal analysis of a serpentine flat plate collector and investigation of the flow and convection regime

Korres

Tzivanidis

2019

Therm sci

View full text Add to dashboard Cite

A special kind of flat plate collectors was examined in detail through CFD analysis. The distinctiveness of the current model has to do with the piping system was applied which is a serpentine flow conduit. The operation of the collector was examined at four different inclination angles (0°, 15°, 30°, and 45°) and several values of the inlet water temperature (10-80 °C per 10 °C) by providing the same heat perpendicular to the cover in each case. The thermal efficiency as well as the temperature fields of the collector was determined first. Furthermore, the overall heat losses were calculated and compared to these arisen from the Cooper-Dunkle assumption while the mean divergence between these two solutions was around 5%. Moreover, the natural convection inside the gap as well as the tube to water convection was examined and the heat transfer coefficients were validated from theoretical models in horizontal position. In particular, the simulation results found to diverge from the theoretical ones about 12.5% and 7% as regards the pipe flow and the air-gap, respectively. In addition, a remarkable flow phenomenon was observed at the bends of the pipe and the nature of it was explained in detail. Last but not least, the inclination angle seems that affects significantly the collector's performance since the higher the slope the lower the convection losses. Solidworks and its simulation program Flow Simulation were used to design and simulate the whole collector.

show abstract

A non-linear flat-plate collector model

Cited by 47 publications

References 2 publications

The Effect of the Angle of Inclination on the Efficiency in a Medium-Temperature Flat Plate Solar Collector

The Effect of the Angle of Inclination on the Efficiency in a Medium-Temperature Flat Plate Solar Collector

Modelling and simulation of Building-Integrated solar thermal systems: Behaviour of the system

Thermal analysis of a serpentine flat plate collector and investigation of the flow and convection regime

Contact Info

Product

Resources

About