Heat Release Rate (HRR)

Heat Release Rate (HRR) is a measure of how quickly heat is produced and emitted during a fire, typically expressed in kilowatts (kW). It indicates the intensity of a fire by showing the rate at which combustible material releases energy as it burns. A higher HRR means a more intense and potentially more dangerous fire, as it releases heat faster and can promote rapid fire growth. HRR is an important factor in fire safety because it helps analyze fire behavior, plan responses, and design safer building materials and structures.