Experimental investigation of graphene nanoplatelets nanofluid-based volumetric solar collector for domestic hot water systems

Solar Energy ◽  
2016 ◽  
Vol 131 ◽  
pp. 119-130 ◽  
Author(s):  
M. Vakili ◽  
S.M. Hosseinalipour ◽  
S. Delfani ◽  
S. Khosrojerdi ◽  
M. Karami
Keyword(s):  
Experimental Investigation ◽  
Solar Collector ◽  
Water Systems ◽  
Graphene Nanoplatelets ◽  
Hot Water ◽  
Domestic Hot Water

Three Experimental Techniques to Duplicate the Net Thermal Output of an Irradiated Collector Array

1983 ◽  
Vol 105 (1) ◽  
pp. 92-100 ◽  
Author(s):  
A. H. Fanney ◽  
W. C. Thomas
Keyword(s):  
Heat Source ◽  
Solar Collector ◽  
Water Systems ◽  
Hot Water ◽  
Test Method ◽  
Outdoor Environment ◽  
Experimental Techniques ◽  
Laboratory System ◽  
Domestic Hot Water ◽  
Thermal Output

A relevant and repeatable test method is required to provide a means for rating solar domestic hot water systems. The test method should be independent of the geographical location of the laboratory and the prevailing outdoor environment. Three experimental techniques which reproduce the net thermal output of a normally irradiated solar collector without the use of a solar simulator are investigated. These techniques include the use of an in-line electrical heat source only, use of a nonirradiated collector array in series with a heat source, and the use of electrical strip heaters attached to the back of nonirradiated absorber plates. Two single-tank direct solar domestic hot water systems have been fabricated at the National Bureau of Standards to validate each experimental technique. The solar collector array of one system is subjected to outdoor meteorological conditions. The second system, used to validate the experimental techniques, is located entirely indoors. Daily tests of the solar domestic hot water system with the irradiated collector array were subsequently repeated for the laboratory system using the three experimental techniques. Based on results from several nearly clear and intermittently cloudy days, all three simulation techniques reproduce the net thermal output of the normally irradiated collector array within 4 percent. Pump controller operation can be closely reproduced using two of the techniques. Advantages and limitations of each method are discussed.

A Design Method for Thermosyphon Solar Domestic Hot Water Systems

1987 ◽  
Vol 109 (2) ◽  
pp. 150-155 ◽  
Author(s):  
M. P. Malkin ◽  
S. A. Klein ◽  
J. A. Duffie ◽  
A. B. Copsey
Keyword(s):  
Flow Rate ◽  
Design Method ◽  
Water Systems ◽  
Hot Water ◽  
Average Flow Rate ◽  
Domestic Hot Water ◽  
Average Flow ◽  
Solar Fraction ◽  
Wide Range ◽  
Flow Circuit

A modification to the f-Chart method has been developed to predict monthly and annual performance of thermosyphon solar domestic hot water systems. Stratification in the storage tank is accounted for through use of a modified collector loss coefficient. The varying flow rate throughout the day and year in a thermosyphon system is accounted for through use of a fixed monthly “equivalent average” flow rate. The “equivalent average” flow rate is that which balances the thermosyphon buoyancy driving force with the frictional losses in the flow circuit on a monthly average basis. Comparison between the annual solar fraction predited by the modified design method and TRNSYS simulations for a wide range of thermosyphon systems shows an RMS error of 2.6 percent.

Modeling occupant behavior’s influence on the energy efficiency of solar domestic hot water systems

2022 ◽  
Vol 309 ◽  
pp. 118503
Author(s):  
Xin Zhou ◽  
Shuai Tian ◽  
Jingjing An ◽  
Da Yan ◽  
Lun Zhang ◽  
...  
Keyword(s):  
Energy Efficiency ◽  
Water Systems ◽  
Hot Water ◽  
Domestic Hot Water
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