An Investigation on the Thermal Characteristics of Heat-Responsive Element of Sprinkler Head

Abstract

In this study thermal characteristics of heat-responsive element considering conduction, convection and rate of change of element using Response Time Index (RTI) applied to sensitivity test of sprinkler head at home and aborad are theoretically investigated. Analytic solution of temperature distributions with radial direction and time is obtained form energy transport equations, non-homogeneous 2th order partial differential equation, applying to constant wall temperature and symmetric condition in order to analyze thermal characteristics of heat-responsive element for circular cylindrical geometry. Base on the results, the analytic method of this study is fundamental data to practical use for sensitivity test of sprinkler head and design of heat-responsive element.

Activation Conditions of Sprinkler Head Considering Fire Growth Scenario

“…Chow와 Ho (8) 는 유리벌브형 헤드에 대해 1 m/s이하의 저속 고온 유동장하에서 측정된 RTI 값이 유속에 따라 차 이를 보였으며 이러한 영향이 고온기류로부터의 대류열전 달의 영향에 비해 배관으로의 열손실의 영향이 상대적으로 커지기 때문임을 제시하였다. Choi와 Yoon (9) (2,4,7) . FDS 모델에서는 기존의 2변수모델을 기반으로 기류 내 존재하는 액적 등의 냉각효과를 고려한 해석모델을 적용하고 있다 (10) .…”