Fire experiment of a full-scale compartment was performed in order to quantitatively evaluate fire control effect of water discharge system. Sprinkler and water mist equipment were used as the water discharge system. In the case of no water discharge, heat release rate was 500 kW. When the water discharge system operated, following heat release rate was obtained. 1. One head of sprinkler: 460 kW. 2. Four heads of sprinkler and one head of water mist: 410 kW. 3. Four heads of water mist: 330 kW. The heat release rate increases temporarily immediately after water mist operates. In this experiment, in addition, reduction effect of temperature in the compartment and passage by the water discharge was considered.
