The following calculation is intended to be used for design purposes. A fire has a heat release rate of 10 megawatts, a diameter of 4m. Using the point source model; what is the worst case design radiant heat flux to a target 100 feet from the edge of the fire assuming a radiant fraction of 30%.
To calculate the worst-case design radiant heat flux using the point source model, we can use the following formula:
Q = (1 - F) x HRR / (4 x pi x r^2)
where Q is the radiant heat flux, F is the radiant fraction, HRR is the heat release rate, and r is the distance from the point source to the target.
Plugging in the given values, we get:
Q = (1 - 0.3) x 10 MW / (4 x pi x (100 ft x 0.3048 m/ft)^2)
Q = 0.7 x 10,000 kW / (4 x 3.1416 x 30.48 m^2)
Q = 22.35 kW/m^2
Therefore, the worst-case design radiant heat flux to a target 100 feet from the edge of the fire is 22.35 kW/m^2.