scholarly journals Thermal Performance of Solar Collectors with EPDM Absorber Plates

1988 ◽  
Vol 41 (4) ◽  
pp. 623
Author(s):  
MJ O'Keefe ◽  
JLA Francey
Keyword(s):  
Experimental Study ◽  
Thermal Resistance ◽  
Flat Plate ◽  
Heat Loss ◽  
Thermal Performance ◽  
Critical Value ◽  
Solar Collectors ◽  
Flow Rates ◽  
Mass Flow Rates ◽  
High Thermal Resistance

An experimental study of flat-plate solar collectors using ethylene, propylenediene monomer (EPDM) absorber plates is descn"bed. In spite of the high thermal resistance of this material the performance is found to compare well with metal absorbers and to be in agreement with the Hottel-Whillier-Bliss equation. There is, however, an observed increase in the heat loss coefficient for mass flow rates below a critical value.

scholarly journals An experimental study of the thermal performance of the square and rhombic solar collectors

2018 ◽  
Vol 22 (1 Part B) ◽  
pp. 487-494 ◽  
Author(s):  
Aminreza Noghrehabadi ◽  
Ebrahim Hajidavaloo ◽  
Mojtaba Moravej ◽  
Ali Esmailinasab
Keyword(s):  
Experimental Study ◽  
Flat Plate ◽  
Mass Flow Rate ◽  
Mass Flow ◽  
Flow Rate ◽  
Thermal Performance ◽  
Thermal Efficiency ◽  
Solar Collectors ◽  
Heating Systems ◽  
Solar Water Heating

Solar collectors are the key part of solar water heating systems. The most widely produced solar collectors are flat plate solar collectors. In the present study, two types of flat plate collectors, namely square and rhombic collectors are experi?mentally tested and compared and the thermal performance of both collectors is investigated. The results show both collectors have the same performance around noon (?61%), but the rhombic collector has better performance in the morning and afternoon. The values for rhombic and square collectors are approximately 56.2% and 53.5% in the morning and 56.1% and 54% in the afternoon, respectively. The effect of flow rate is also studied. The thermal efficiency of rhombic and square flat plate collectors increases in proportion to the flow rate. The results indicated the rhombic collector had better performance in comparison with the square collector with respect to the mass-flow rate.

scholarly journals Measuring the Rate of Heat Loss Across Selected Building Materials

2020 ◽  
Vol 11 (1) ◽  
Author(s):  
Genesis Zambrano ◽  
Keyword(s):  
Thermal Resistance ◽  
Heat Loss ◽  
Thermal Performance ◽  
Building Materials ◽  
Thermal Conductance ◽  
High Thermal Resistance ◽  
Resistance Value

The rate of heat loss is analyzed for three materials: glass, brick and wood. To do this, the initial and final temperatures are set to 75℉ and 100℉, respectively, and the dimensions of each material are chosen to be 5ft by 5ft with a thickness of 2 inches. The objective of this paper is to see which material is best for insulating heat, thus enhancing the thermal performance of a building. Results from this study suggest that glass and brick have a higher rate of heat loss (high thermal conductance values and low thermal resistance values) compared to wood and are therefore poor insulators whereas wood, with a lower rate of heat loss (low thermal conductance value and a high thermal resistance value) serves as a better insulator.

scholarly journals An experimental study of the mass flow rates effect on flat-plate solar water heater performance using Al2O3/water nanofluid

2017 ◽  
Vol 21 (suppl. 2) ◽  
pp. 379-388 ◽  
Author(s):  
Michael Prakasam ◽  
Thottipalayam Arjunan ◽  
Sadanandam Nataraj
Keyword(s):  
Experimental Study ◽  
Flat Plate ◽  
Mass Flow ◽  
Solar Water Heater ◽  
Water Heater ◽  
Flow Rates ◽  
Solar Water ◽  
Mass Flow Rates

On strong blowing into an incompressible airstream

1973 ◽  
Vol 60 (2) ◽  
pp. 241-255 ◽  
Author(s):  
F. T. Smith
Keyword(s):  
Experimental Study ◽  
Flow Field ◽  
Velocity Profile ◽  
Air Injection ◽  
Relative Mass ◽  
Pressure Measurements ◽  
Flow Rates ◽  
Mass Flow Rates ◽  
Strong Injection ◽  
Steady Laminar

An experimental study of distributed air-injection from a porous section of a flat plate into a uniform incompressible airflow is described. The relative mass flow rates of the injection varied between 0·008 and 0·053 (strong injection) and the blowing was fairly uniformly distributed. In the resulting flow field, which was predominantly laminar except near the dividing streamline, where unsteadiness prevailed, velocity profile and pressure measurements were taken and the position of the dividing streamline thereby estimated. Overall the results agree fairly well with the steady laminar theory for strong normal blowing, outlined in §2, although for the strongest blow some signs of separation some way upstream of the blow are apparent.

scholarly journals Comparative Experimental Study of New Absorbent Surface Coatings for Flat Plate Solar Collectors

2014 ◽  
Vol 57 ◽  
pp. 2131-2138 ◽  
Author(s):  
Maira Lorena Trejos Moncada ◽  
Beatriz Cruz Muñoz ◽  
M. Miki Yoshida ◽  
Rubén Dorantes Rodríguez
Keyword(s):  
Experimental Study ◽  
Flat Plate ◽  
Surface Coatings ◽  
Solar Collectors
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