106-AN grout pilot-scale test HGTP-93-0501-02 Page: 77 of 151
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over the week for the third lift was due to a similar trend in the inlet air
temperatures.
The expanded 24-hour period of the surface, inlet, and outlet
temperatures for the third lift (see Figure 6.14) are similar to that for the
second lift. The heat removal rate peaks when the surface temperature peaks.
However, the grout surface temperature follows the inlet air temperature more
closely than the second lift liquid temperature. This probably explains the
greater surface temperature fluctuations seen in the third lift.
The total amount of heat removed and the total quantity of water
evaporated for the 1-week cooling period for each lift was calculated from the
changes in the inlet and outlet air conditions. These values are shown in
Table 6.1. The total amount of water evaporated in the third lift was less
than the amount of water evaporated in the second lift, while the heat removed
from the third lift was greater. This is the only indication that the grout
surface was drier for the third lift than for the other lifts.
The main conclusions that can be drawn from the grout heat removal tests
is that an airflow of 3600 (13) scfm is sufficient to cool the grout surface
with or without a layer of cooling water. Although there were some
indications that the grout surface in the third lift was drying out, this
drying did not significantly affect the ability to remove heat with the
airflow.
TABLE 6.1. Total Heat and Water Removed With Convective/Evaporative Cooling
Total Heat Total Water
Removed Evaporate Lift Temperature
Lift Number (Btu 6%) (a) (gal 6%) a Reduction ( C)
1 79,900 8.5 19.3
2 70,800 7.9 17.2
3 77,600 7.0 18.8
4 99,200 9.9 24.0
(a) Calculated from changes in the inlet and outlet air conditions.6.9
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Bagaasen, L. M. 106-AN grout pilot-scale test HGTP-93-0501-02, report, May 1, 1993; Richland, Washington. (https://digital.library.unt.edu/ark:/67531/metadc1319387/m1/77/: accessed July 16, 2024), University of North Texas Libraries, UNT Digital Library, https://digital.library.unt.edu; crediting UNT Libraries Government Documents Department.