A Study on a Modified Model for the Hold Time of a Clean Extinguishing Agent

When estimating the theoretical hold time of a Clean Extinguishing Agent (CEA), the hold time is predicted using a leakage exponent and leakage characteristics that are measured through an Enclosure Integrity Test (EIT). In particular, the leakage exponent <inline-formula><math xmlns="...

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Autores principales:	Goonho Kim, Jee-Hun Jeong, Hyun-Jeong Bang, Ho-Jun Lee
Formato:	article
Lenguaje:	EN
Publicado:	MDPI AG 2021
Materias:	fire extinguishing system clean extinguishing agent retention time hold time enclosure integrity test Technology T Engineering (General). Civil engineering (General) TA1-2040 Biology (General) QH301-705.5 Physics QC1-999 Chemistry QD1-999
Acceso en línea:	https://doaj.org/article/8b7afda4b5634afe8b062e385cf292df
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id	oai:doaj.org-article:8b7afda4b5634afe8b062e385cf292df
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spelling	oai:doaj.org-article:8b7afda4b5634afe8b062e385cf292df2021-11-11T15:20:45ZA Study on a Modified Model for the Hold Time of a Clean Extinguishing Agent10.3390/app1121103122076-3417https://doaj.org/article/8b7afda4b5634afe8b062e385cf292df2021-11-01T00:00:00Zhttps://www.mdpi.com/2076-3417/11/21/10312https://doaj.org/toc/2076-3417When estimating the theoretical hold time of a Clean Extinguishing Agent (CEA), the hold time is predicted using a leakage exponent and leakage characteristics that are measured through an Enclosure Integrity Test (EIT). In particular, the leakage exponent <inline-formula><math xmlns="http://www.w3.org/1998/Math/MathML" display="inline"><semantics><mi>n</mi></semantics></math></inline-formula> is conventionally applied as 0.5, but recently, a variable exponent has been applied through measurement (approximately 0.48 to 0.85). When variable <inline-formula><math xmlns="http://www.w3.org/1998/Math/MathML" display="inline"><semantics><mi>n</mi></semantics></math></inline-formula> is applied, the hold time varies greatly depending on the size of <inline-formula><math xmlns="http://www.w3.org/1998/Math/MathML" display="inline"><semantics><mi>n</mi></semantics></math></inline-formula>. Therefore, in this study, a modified theoretical model for the hold time of a CEA is proposed to improve the accuracy of the hold time depending on the leakage exponent <inline-formula><math xmlns="http://www.w3.org/1998/Math/MathML" display="inline"><semantics><mi>n</mi></semantics></math></inline-formula>. The modified theoretical model applies a different analysis of the inflow and outflow volumetric flow, and the results enable a more accurate hold time prediction. The modified theoretical equation shows an improvement of up to 8.6% for outflow volumetric flow <inline-formula><math xmlns="http://www.w3.org/1998/Math/MathML" display="inline"><semantics><mrow><msub><mover accent="true"><mi>V</mi><mo>˙</mo></mover><mi>o</mi></msub></mrow></semantics></math></inline-formula> and a maximum improvement of approximately 10.7% for hold time <inline-formula><math xmlns="http://www.w3.org/1998/Math/MathML" display="inline"><semantics><mrow><msub><mi>t</mi><mi>h</mi></msub></mrow></semantics></math></inline-formula>.Goonho KimJee-Hun JeongHyun-Jeong BangHo-Jun LeeMDPI AGarticlefire extinguishing systemclean extinguishing agentretention timehold timeenclosure integrity testTechnologyTEngineering (General). Civil engineering (General)TA1-2040Biology (General)QH301-705.5PhysicsQC1-999ChemistryQD1-999ENApplied Sciences, Vol 11, Iss 10312, p 10312 (2021)
institution	DOAJ
collection	DOAJ
language	EN
topic	fire extinguishing system clean extinguishing agent retention time hold time enclosure integrity test Technology T Engineering (General). Civil engineering (General) TA1-2040 Biology (General) QH301-705.5 Physics QC1-999 Chemistry QD1-999
spellingShingle	fire extinguishing system clean extinguishing agent retention time hold time enclosure integrity test Technology T Engineering (General). Civil engineering (General) TA1-2040 Biology (General) QH301-705.5 Physics QC1-999 Chemistry QD1-999 Goonho Kim Jee-Hun Jeong Hyun-Jeong Bang Ho-Jun Lee A Study on a Modified Model for the Hold Time of a Clean Extinguishing Agent
description	When estimating the theoretical hold time of a Clean Extinguishing Agent (CEA), the hold time is predicted using a leakage exponent and leakage characteristics that are measured through an Enclosure Integrity Test (EIT). In particular, the leakage exponent <inline-formula><math xmlns="http://www.w3.org/1998/Math/MathML" display="inline"><semantics><mi>n</mi></semantics></math></inline-formula> is conventionally applied as 0.5, but recently, a variable exponent has been applied through measurement (approximately 0.48 to 0.85). When variable <inline-formula><math xmlns="http://www.w3.org/1998/Math/MathML" display="inline"><semantics><mi>n</mi></semantics></math></inline-formula> is applied, the hold time varies greatly depending on the size of <inline-formula><math xmlns="http://www.w3.org/1998/Math/MathML" display="inline"><semantics><mi>n</mi></semantics></math></inline-formula>. Therefore, in this study, a modified theoretical model for the hold time of a CEA is proposed to improve the accuracy of the hold time depending on the leakage exponent <inline-formula><math xmlns="http://www.w3.org/1998/Math/MathML" display="inline"><semantics><mi>n</mi></semantics></math></inline-formula>. The modified theoretical model applies a different analysis of the inflow and outflow volumetric flow, and the results enable a more accurate hold time prediction. The modified theoretical equation shows an improvement of up to 8.6% for outflow volumetric flow <inline-formula><math xmlns="http://www.w3.org/1998/Math/MathML" display="inline"><semantics><mrow><msub><mover accent="true"><mi>V</mi><mo>˙</mo></mover><mi>o</mi></msub></mrow></semantics></math></inline-formula> and a maximum improvement of approximately 10.7% for hold time <inline-formula><math xmlns="http://www.w3.org/1998/Math/MathML" display="inline"><semantics><mrow><msub><mi>t</mi><mi>h</mi></msub></mrow></semantics></math></inline-formula>.
format	article
author	Goonho Kim Jee-Hun Jeong Hyun-Jeong Bang Ho-Jun Lee
author_facet	Goonho Kim Jee-Hun Jeong Hyun-Jeong Bang Ho-Jun Lee
author_sort	Goonho Kim
title	A Study on a Modified Model for the Hold Time of a Clean Extinguishing Agent
title_short	A Study on a Modified Model for the Hold Time of a Clean Extinguishing Agent
title_full	A Study on a Modified Model for the Hold Time of a Clean Extinguishing Agent
title_fullStr	A Study on a Modified Model for the Hold Time of a Clean Extinguishing Agent
title_full_unstemmed	A Study on a Modified Model for the Hold Time of a Clean Extinguishing Agent
title_sort	study on a modified model for the hold time of a clean extinguishing agent
publisher	MDPI AG
publishDate	2021
url	https://doaj.org/article/8b7afda4b5634afe8b062e385cf292df
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A Study on a Modified Model for the Hold Time of a Clean Extinguishing Agent

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