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The data shown in Figure 4.12 hold true with the expected results of more absorbed radiation in the summer than the winter. The results also show more absorbed radiation at lower incidence angles which is counterintuitive but believed to be accurate. Now that the amount of absorbed radiation was known the next step was to calculate the outlet temperature of the collectors. In order to determine the maximum temperature gain per collector equation 4.3 was used to solve for the temperature difference per unit area of collector. (4.3) In equation 4.3 above; Tfo is the temperature of the fluid at the outlet of the collector, Tfi is the temperature at the inlet to the ETC, Ta is the ambient air temperature, and Cp is the specific heat of the fluid. The heat removal factor, Fr, was found to be 1.888 from the SRCC rating of the ETC. The overall heat loss coefficient, Ul, was found to be 0.7 W/m2*0C from the SRCC rating as well. Ac, the collector area was found from the collector data sheet but was not used in the calculation above. The mass flow rate of the fluid, mdot, was also calculated from the data sheet for the ETC which gave the recommended volumetric flow rate of 0.028 GPM per tube. The value of the solar radiation absorbed by the ETC, S, was previously calculated through equation 4.2. The ambient temperature, Ta, was taken from the 22-year average values for each month. The inlet fluid temperature, Tfi, value was a design set point of 60 degrees Fahrenheit because this is approximately what the temperature of city water would be. Using the assumption of inlet temperature and the aperture area for a collector of 30 tubes from the data sheet, the output temperature from the collectors was able to be calculated. The output temperature was then divided by the desired output temperature 89PDF Image | NESTER, RYAN TIMOTHY. Organic Rankine Cycles: A Comparative Study and Analysis of Multiple Applications.
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