在隔间灭火器中灭火剂的热特性
Tae-Sun Kim1, Tae-Hee Park1, Jeong-Hwa Park1
1Fire Technology Research Division, National Fire Research Institute, Asan-si, Chungcheongnam-do, Republic of Korea.
Science progress
|August 3, 2024
概括
与水相比,压缩空气泡 (CAF) 和传统泡提供了优越的灭火性能. 泡剂提供更持久的冷却和更好的热屏蔽,使灭火更有效.
科学领域:
- 消防科学 火灾科学
- 材料科学 材料科学 材料科学
背景情况:
- 水和泡灭火剂具有不同的机制和泡结构.
- 这些差异影响了热特性和灭火能力.
研究的目的:
- 研究水,传统泡和压缩空气泡 (CAF) 的热特性.
- 评估它们在隔间灭火方面的有效性,重点关注外部墙壁应用.
主要方法:
- 一个隔间的火灾 (6m x 3m x 3m) 用水,传统的泡和CAF应用于外墙被抑制.
- 评估了内部冷却,反燃性和隔热效应.
主要成果:
- 所有的药物都降低了内部隔间的温度.
- 与水相比,CAF的应用导致温度重新升高的延迟长1.76至4.5倍.
- 发泡剂在初始抑制过程中表现出优越的隔热效应.
结论:
- 泡剂,特别是CAF,表现出用于灭火的增强热特性.
- 使用泡剂可以导致更有效的灭火,因为改善了冷却和热屏蔽.
相关概念视频
Design Example: Flow Through a Fire Extinguisher
129
A fire extinguisher that uses pressurized water relies on fluid dynamics principles to generate a high-velocity stream capable of suppressing flames. The water is stored at a much higher pressure inside the extinguisher than the surrounding atmosphere. This pressure difference forces the water to flow rapidly when the extinguisher is activated, and the behavior of the water as it exits the nozzle can be understood using fundamental equations of fluid dynamics.
The key to understanding how the...
The key to understanding how the...
129
Flame Photometry: Overview
522
Flame photometry, also known as flame emission spectrometry, is a technique used for the qualitative and quantitative analysis of elements present in a sample using a flame as the source of excitation energy. The concept of flame photometry was realized in the early 1860s by Kirchhoff and Bunsen, who discovered that specific elements emit characteristic radiation when excited in flames. The first instrument developed for this purpose was used to measure sodium (Na) in plant ash using a Bunsen...
522
Enthalpy and Heat of Reaction
8.3K
Combustion, commonly known as burning, is a reaction in which a substance reacts with an oxidizing agent, which in most cases is molecular oxygen, to liberate energy in the form of heat, light, or sound. The heat of combustion is also known as the enthalpy of combustion. The energy released when one mole of a substance undergoes complete combustion at constant pressure is called molar heat of combustion. Combustion reactions are exothermic; that is, they release energy, and their ΔH sign...
8.3K
Mechanisms of Heat Transfer I
4.2K
Just as interesting as the effects of heat transfer on a system are the methods by which the heat transfer occur. Whenever there is a temperature difference, heat transfer occurs. It may occur rapidly, such as through a cooking pan, or slowly, such as through the walls of a picnic ice box. So many processes involve heat transfer that it is hard to imagine a situation where no heat transfer occurs. Yet, every heat transfer takes place by only three methods: conduction, convection, and radiation.
4.2K
Molecular Comparison of Gases, Liquids, and Solids
40.8K
Particles in a solid are tightly packed together (fixed shape) and often arranged in a regular pattern; in a liquid, they are close together with no regular arrangement (no fixed shape); in a gas, they are far apart with no regular arrangement (no fixed shape). Particles in a solid vibrate about fixed positions (cannot flow) and do not generally move in relation to one another; in a liquid, they move past each other (can flow) but remain in essentially constant contact; in a gas, they move...
40.8K
Constant Volume Calorimetry
27.0K
Calorimeters are useful to determine the heat released or absorbed by a chemical reaction. Coffee cup calorimeters are designed to operate at constant (atmospheric) pressure and are convenient to measure heat flow (or enthalpy change) accompanying processes that occur in solution at constant pressure. A different type of calorimeter that operates at constant volume, colloquially known as a bomb calorimeter, is used to measure the energy produced by reactions that yield large amounts of heat and...
27.0K


