25513

Peak Storage Output

= 255

Column 4 = Column 3 - Column 2 Column 5(n) = Column 5(n-1) + Column 4(n)

Column 4 = Column 3 - Column 2 Column 5(n) = Column 5(n-1) + Column 4(n)

and column 5 shows the amount of cooling contained in the storage system at the end of each hour of operation. This system was designed so that there would be 0 capacity remaining in the thermal storage tanks after the on-peak period, as shown at the bottom of Table 19.6. The values in Table 19.6 will be utilized in the next section to determine the storage capacity required for each of the different storage mediums.

The optional partial storage system is a blend of the two systems presented earlier. Values given in Table 19.7 and Figure 19.4 are one combination of several possibili ties that would drop the consumption and peak demand during the on-peak period. Once again this system has been designed to run both chillers during off-peak hours and run only one during on-peak hours. Benefits of this arrangement are that the current chiller system could be used in combination with the storage system and that the storage system does not require as much capacity as the full storage system. Also, a reserve chiller is available during peak-load times.

Comparing the peak demand with and without storage in Table 19.7 shows that the optional partial stor-

Tablel9.6 Full storageoperation profile.

Thermal Storage Operation Profile _Full StorogeSystem_

1 2 3 4 5 6

Hour of

Cooling

Chiller

Capacity to

Capacity

Storage

Day

Load

Load

Storage

In Storage

Cycle

0 0

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