Abstract
A generalized method is presented for determining the response time for thermally actuated sprinklers installed near the ceiling of both large and small compartments. A substitute source for the actual fire is calculated to account for the effects of a warm gas layer in the upper portion of the enclosure on ceiling-layer flow temperatures. Illustrative examples are given for the change in response time for sprinklers with RTI values of 25, 100, and 400 m 1 2 , s 1 2 , to a given fire in a series of compartments ranging in floor area from 23.8 m 2 (256 ft 2) to 24 300 m 2 (262 000 ft 2). For comparative purposes sprinkler response is also calculated for the limiting case of an unconfined ceiling.
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