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The performance of a wet cooling tower is calculated by the GateCycle program using a combination of the dry bulb temperature and the relative humidity. However, the data contained in the Excelergy weather file DAG_TMY2_hr lists dry bulb temperature and dew point temperature. The relative humidities were calculated from the dew point temperatures using the standard expression, as follows: φ=Steamsaturationpressureatdewpointtemperature,lbf /in2 Steam saturation pressure at dry bulb temperature, lb f /in 2 For the hours in which the direct normal radiation exceeded 250 W/m2, the dry bulb temperatures were plotted against the corresponding relative humidities, which yielded the distribution shown in Figure 8. 1.00 0.90 0.80 0.70 0.60 0.50 0.40 0.30 0.20 0.10 0.00 Figure 8 Dry Bulb Temperatures and Calculated Coincident Relative Humidities Using the equation shown in Figure 8, a representative annual relative humidity was developed for each dry bulb temperature. From this information, the gross plant output and cooling tower water consumption were calculated for a series of dry bulb temperatures between 40 °F and 120 °F. The results, summarized in Table 5, show the plant output to be essentially invariant with the ambient temperature. However, the cooling tower water use varies inversely with the ambient temperature. Task 2 Wet/Dry Heat Rejection Analysis 3.3 Annual Performance Calculations y = 0.00010001x2 - 0.02455648x + 1.61571832 30 40 50 60 70 80 90 100 110 120 Dry Bulb Temperature, oF - 13 - Relative Humidity .PDF Image | Nexant Parabolic Trough Solar Power Plant Systems Analysis
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