Table 3 Evaporative effectiveness calculated from performance measurements resulting in smallest – RMSE Performance Metric EE RMSE CV Average Power 0.51 44.0 2442.4 Watts 1.8% Capacity 0.46 323 Watts 11,170 2.9% COP* 0.44 0.18 4.6 3.9% Table 4 RMSE calculated from performance measurements with EE = 0.51 – Performance Metric EE RMSE CV Average Power 0.51 44.0 Watts 2442.4 1.8% Capacity 0.51 331 Watts 11,170 3.0% COP* 0.51 0.23 4.6 5.0% Table 5 RMSE calculated from performance measurements with EE = 0.51 for subsequent data set – that was not used in the model development Performance Metric EE RMSE CV Average 0.51 67.1 2396.3 2.8% Capacity 0.51 200 Watts 11,357 1.8% COP* 0.51 0.14 4.9 2.9% Figure 6 - Measured condensing unit with pre-cooler compared to predictions based upon constant evaporative effectiveness of 0.51 in Equation 5. Figure 7 Measured system capacity with pre-cooler compared to predictions based upon constant evaporative – effectiveness of 0.51 in Equation 5. Figure 8 Measured system COP* with pre-cooler compared to predictions upon constant evaporative – effectiveness of 0.51 in Equation 5. Power for evaporator fan not included. Figure 9 Measured condensing unit with pre-cooler compared to predictions based upon constant – evaporative effectiveness of 0.51 in Equation 5, for second data set that was not used to calculate evaporative effectiveness..
Table 3 – Evaporative effectiveness calculated from performance measurements resulting in smallest RMSE Performance Metric EE RMSE Average CV Power 0.51 44.0 2442.4 Watts 1.8% Capacity 0.46 323 Watts 11,170 2.9% COP* 0.44 0.18 4.6 3.9% Table 4 – RMSE calculated from performance measurements with EE = 0.51 Performance Metric EE RMSE Average CV Power 0.51 44.0 Watts 2442.4 1.8% Capacity 0.51 331 Watts 11,170 3.0% COP* 0.51 0.23 4.6 5.0% Table 5 – RMSE calculated from performance measurements with EE = 0.51 for subsequent data set that was not used in the model development Performance Metric EE RMSE Average CV 0.51 67.1 2396.3 2.8% Capacity 0.51 200 Watts 11,357 1.8% COP* 0.51 0.14 4.9 2.9% Figure 6 - Measured condensing unit with pre-cooler compared to predictions based upon constant evaporative effectiveness of 0.51 in Equation 5. Figure 7 – Measured system capacity with pre-cooler compared to predictions based upon constant evaporative effectiveness of 0.51 in Equation 5. Figure 8 – Measured system COP* with pre-cooler compared to predictions upon constant evaporative effectiveness of 0.51 in Equation 5. Power for evaporator fan not included. Figure 9 – Measured condensing unit with pre-cooler compared to predictions based upon constant evaporative effectiveness of 0.51 in Equation 5, for second data set that was not used to calculate evaporative effectiveness..
SDGE%20Pre-cooler%20Final%20Report%2003_29.docx