The estimated cooling and heating equivalent full load hours (EFLH) for a nine-month school in south Texas are: [EFLH.sub.C] = 1,000 hours, [EFLH.sub.h] = 130 hours.
To match the 1,130 (1,000 + 130) equivalent full load hours of the south central Texas school, the assumption is made that the drive ramps down to minimum flow and head for 6,350 hours per year, 25% load for 1,200 hours, 50% load for 600 hours, 75% load for 360 hours, and 250 hours at full load.
five), the equivalent full load hours of a hybrid cooling tower are related to the annual ground loads ratio through an approximate quadratic relationship as shown in Figure 9.
The peak heat rejection rate of a hybrid cooling tower is estimated using the annual equivalent full load hour concept, where the annual equivalent full load hours of a hybrid cooling tower are correlated to the ratio of annual ground heating load to cooling load.
Cooling tower capacity is calculated from the annual equivalent full load hours of the cooling tower, which are correlated to the ratio of annual ground heating load to cooling load.
To determine the cooling tower capacity required to provide this annual heat rejection, an equivalent full load hour concept is used.
Therefore, the approach taken here to design a cooling tower from a known quantity of annual energy rejected is based on the equivalent full load hour concept.
The first case represents a typical situation experienced in a cold climate (where [T.sub.g] = 10[degrees]C and [T.sub.mean] = 0[degrees]C) where the number of heating hours, represented here using the concept of equivalent full load hours, is greater than the number of cooling hours.
where BL is the block load and [EFLH.sub.cooling] and [EFLH.sub.heating] are the annual equivalent full load hours in cooling and heating, respectively.