Computational and Experimental Validation of Fractal-Fin, Dimpled Solar Heat Collector.

2021 ◽  
Author(s):  
Salvador Rodriguez
Keyword(s):  
Experimental Validation ◽  
Solar Heat ◽  
Heat Collector

Glass solar heat collector development

1975 ◽  
Author(s):  
R. GILLETTE ◽  
C. DEMINET ◽  
W. BEVERLY
Keyword(s):  
Solar Heat ◽  
Heat Collector

Exergy analysis of solar heat collector with air jet impingement on dimple-shape-roughened absorber surface

2021 ◽  
Author(s):  
Mohammad Salman ◽  
Ranchan Chauhan ◽  
Sung Chul Kim
Keyword(s):  
Exergy Analysis ◽  
Jet Impingement ◽  
Solar Heat ◽  
Air Jet ◽  
Heat Collector ◽  
Absorber Surface

Utilizing jet impingement on protrusion/dimple heated plate to improve the performance of double pass solar heat collector

2021 ◽  
Author(s):  
Mohammad Salman ◽  
Ranchan Chauhan ◽  
Ganesh kumar Poongavanam ◽  
Myeong Hyun Park ◽  
Sung Chul Kim
Keyword(s):  
Jet Impingement ◽  
Heated Plate ◽  
Double Pass ◽  
Solar Heat ◽  
Heat Collector

scholarly journals A Solar-Energy Method for Reducing Coffee-Drying Costs

1969 ◽  
Vol 47 (4) ◽  
pp. 226-235
Author(s):  
Allan L. Phillips
Keyword(s):  
Solar Energy ◽  
Static Pressure ◽  
Electric Heating ◽  
Operating Costs ◽  
Solar Heat ◽  
Processing Facility ◽  
Heat Collector ◽  
Electricity Costs ◽  
Labor Requirements ◽  
Experimental Processing

1. Modern coffee-processing facilities that have been developed recently have provided the features of low equipment costs and reduced labor requirements, but are somewhat expensive to operate when electric power is used entirely to heat the drying air. 2. The use of solar energy as a heat source was considered, since previous research where solar heat was used to dry other crops indicates that solar heat-collectors could also be used successfully for drying coffee. 3. An experimental processing facility which employs a solar heat-collector was built and operated, and it has been demonstrated that worthwhile reductions in operating costs can be achieved through the use of solar energy. 4. It was concluded that other coffee producers could economically use solar heat-collectors to reduce electricity costs. Drying facilities should be designed using the following as guides: A. Provide 10 square feet of drying-bin area for each 100 hundred-weights of coffee produced yearly. B. Install a fan which will deliver 100 c.f.m. per square foot of bin area against a static pressure of 1-inch water gage. C. Construct the solar heat-collector according to the specifications presented in figure 1. D. Install electric heating elements which provide up to 5,000 w. for each 100 hundred-weights processed yearly.

scholarly journals Temperature Measurements on a Solar and Low Enthalpy Geothermal Open-Air Asphalt Surface Platform in a Cold Climate Region

Energies ◽  
2020 ◽  
Vol 13 (4) ◽  
pp. 979 ◽  
Author(s):  
Caner Çuhac ◽  
Anne Mäkiranta ◽  
Petri Välisuo ◽  
Erkki Hiltunen ◽  
Mohammed Elmusrati
Keyword(s):  
Heat Flux ◽  
Urban Areas ◽  
Storage System ◽  
Energy Resource ◽  
Cold Climate ◽  
Solar Irradiation ◽  
Solar Heat ◽  
Heat Collector ◽  
One Year

Solar heat, already captured by vast asphalt fields in urban areas, is potentially a huge energy resource. The vertical soil temperature profile, i.e., low enthalpy geothermal energy, reveals how efficiently the irradiation is absorbed or radiated back to the atmosphere. Measured solar irradiation, heat flux on the asphalt surface and temperature distribution over a range of depths describe the thermal energy from an asphalt surface down to 10 m depth. In this study, those variables were studied by long-term measurements in an open-air platform in Finland. To compensate the nighttime heat loss, the accumulated heat on the surface should be harvested during the sunny daytime periods. A cumulative heat flux over one year from asphalt to the ground was 70% of the cumulative solar irradiance measured during the same period. However, due to the nighttime heat losses, the net heat flux during 5 day period was only 18% of the irradiance in spring, and was negative during autumn, when the soil was cooling. These preliminary results indicate that certain adaptive heat transfer and storage mechanisms are needed to minimize the loss and turn the asphalt layer into an efficient solar heat collector connected with a seasonal storage system.

Infrared-reflecting selective surface materials which can be useful for architectural and/or solar heat collector windows

1975 ◽  
Author(s):  
D. E. Claridge ◽  
R. C. Langley ◽  
L. Muldawer ◽  
S. Schnatterly ◽  
S. D. Silverstein
Keyword(s):  
Solar Heat ◽  
Surface Materials ◽  
Heat Collector

Experimental Investigation of a New Flat Plate Solar Heat Collector by Micro Heat Pipe Array

2010 ◽  
Author(s):  
Yao-Hua Zhao ◽  
Fei-Long Zou ◽  
Yan-Hua Diao ◽  
Zhen-Hua Quan
Keyword(s):  
Flat Plate ◽  
Heat Pipe ◽  
High Efficiency ◽  
Heat Pipes ◽  
Total Heat Loss ◽  
Solar Heat ◽  
Solar Water ◽  
Micro Heat Pipe ◽  
Heat Collector ◽  
Micro Heat Pipes

The performance of a new flat plate solar heat collector with perfect combination of high efficiency and low cost is investigated experimentally. The new system described in this study uses a novel micro heat pipe array as a key component for the system. One such flat plate heat collector contains over 300 micro heat pipes per 1m2 and the hydraulic diameter of the micro heat pipes is 0.4–1.0mm. A detailed heat transfer experimental study is conducted during daylight hours over several months, focusing on the collector efficiency and overall efficiency of the system as well as total heat loss factor. The results show that the collector’s maximum instantaneous efficiency is up to 88%. Compared with conventional evacuated glass tube solar water heater, the system offers the additional benefits of high pressure resistance, low weight, good reliability and durability, easy integration into buildings and absence of freezing during winter months. Besides, compared with traditional flat-plate solar water system which is mainly sheet-and-tube concept, the system also shows many advantages: higher efficiency, much cheaper, absence of tube-bonding and freezing etc. Therefore, the system proposes a unique substitute to common solar water heating systems.

Application of Exergy Concept to the Analysis of Optimum Operating Conditions of Solar Heat Collectors

1987 ◽  
Vol 109 (4) ◽  
pp. 337-342 ◽  
Author(s):  
A. Suzuki ◽  
H. Okamura ◽  
I. Oshida
Keyword(s):  
Operating Conditions ◽  
Optimum Operating ◽  
Outlet Temperature ◽  
Heat Transfer Medium ◽  
Application System ◽  
Solar Heat ◽  
Heat Collector ◽  
Solar Application ◽  
Plate Type ◽  
Good Agreement

A linear model was developed to obtain the relationships between the characteristic temperatures of the solar heat collector (e.g., the fluid outlet temperature) and the heat capacitance rate of the heat transfer medium. Combining these relationships and the exergy concept, we derived the optimum operating conditions in a general form to satisfy the requirements for the optimum outlet temperature. The optimum operating conditions can be used as a criterion when an appropriate collector type must be chosen for any particular solar application system. To confirm the analytical results, experiments were carried out with a simple flat-plate type solar collector. Good agreement could be obtained between the theoretical values and the experimental results.

scholarly journals EVALUATION OF "MYLAR" PLASTIC FILM AS A SURFACE FOR A SOLAR-HEAT COLLECTOR

1969 ◽  
Vol 49 (4) ◽  
pp. 484-486
Author(s):  
Allan L. Phillips
Keyword(s):  
Plastic Film ◽  
Solar Heat ◽  
Heat Collector

EVALUATION OF "MYLAR" PLASTIC FILM AS A SURFACE FOR A SOLAR-HEAT COLLECTOR

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