- Author
- Heskestad, G. | Delichatsios, M. A.
- Title
- Environments of Fire Detectors. Phase 2. Effect of Ceiling Configuration. Volume 2. Analysis. Final Report.
- Coporate
- Factory Mutual Research Corp., Norwood, MA
- Sponsor
- National Bureau of Standards, Gaithersburg, MD
- Report
- NBS GCR 78-129, June 1978, 112 p.
- Distribution
- Available from National Technical Information Service
- Contract
- GRANT-69001
- Keywords
- beams | ceiling height | detectors | fire detectors | fire growth | heat detectors | room fires | smoke detectors | spacing | velocity
- Abstract
- This volume contains an analysis of experimental data presented in Volume I on (1) the ceiling environment generated by flaming fires under extensive beamed ceilings and (2) the response to this environment by various types of fire detectors. Data on gas temperatures, gas velocities and optical densities have been presented in readily usable form for each of six beam configurations. These data have been converted to "reduced" forms which allow predictions to be made of the environmental variables for any combination of ceiling height and fire growth rate. The experimental response of fire detectors was generally found to conform with available response theories. With the aid of these theories and the data on the "reduced" variables, optimum spacing configurations of fire detectors have been determined as a function of ceiling height for each beam configuration. It is cautioned that the resulting spacing configurations pertain to large, unobstructed beamed ceilings and may be overly conservative in many practical situations.