Figure 14
The horizontal axis, Time in days, ranges from 0 to 18 in increments of 2. The vertical axis, Average Fluid Temperature in degrees Celsius, ranges from minus 5 to 40 in increments of 5. The Wall Surrogate rises from about 18 to 26 degrees Celsius during Pulse 1, then declines towards 19 degrees Celsius. The Outlet Surrogate and Outlet Field T R T rise from about 20 to 38 degrees Celsius before dropping sharply near day 3 and approaching 19 degrees Celsius by day 6. During Pulse 3, both outlet series fall rapidly near day 6 and reach about 1 degree Celsius by day 9, while the wall series decreases to about 10 degrees Celsius. During Pulse 4, all series rise. The wall and outlet surrogate curves level near 17 degrees Celsius, while most field measurements level near 18 degrees Celsius. Three field points near days 10 to 11 lie around 21 to 22 degrees Celsius. Pulse 1 is plus 2,235 watts, with a net value of plus 2,235 watts. Pulse 2 is minus 2,326 watts, with a net value of minus 91 watts. Pulse 3 is minus 1,986 watts, with a net value of minus 2,077 watts. Pulse 4 is plus 2,097 watts, with a net value of plus 20 watts.Comparison of wall and outlet temperatures obtained from a field TRT and the surrogate model