Obstructed Plume - Revision history

User at 22:57, 21 November 2018

2018-11-21T22:57:28Z

2018-11-13T20:26:59Z

2018-11-13T20:26:06Z

2018-11-13T20:16:22Z

2018-11-13T20:15:09Z

2018-11-13T20:14:56Z

2018-11-13T20:10:23Z

2018-11-13T20:08:23Z

2018-11-13T20:04:52Z

2018-11-13T20:04:35Z

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 [https://www.epri.com/#/pages/product/000000003002005578/?lang=en-US EPRI 3002005578 / NUREG-2178] presents methodology to correct for the ZOI due to the obstructed plume effect encountered in electrical enclosures.
 [[File: OPlume1.png]]
 In order to investigate the effect of the enclosure metal top on the plume, a review of past studies and plume theory was conducted. From the review, a series of FDS simulations were conducted. The FDS simulations were performed used the following parameters:
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 * Number of cabinet walls
-[[File: OPlume2.png]]
+[[File: OPlume2.png|framed|none|Unobstructed and Obstructed Temperature Predictions]]
@@ Line 34: / Line 36: @@
-[[File: OPlume3.jpg]]
+[[File: OPlume3.jpg|framed|none|Heskestad versus Obstructed Plume Temperature - Bias and Uncertainty]]
 In other words, the ZOI credit for obstructed plume offers a reduction in vertical ZOI of 24%.
-[[File: OPlume4.png]]
+[[File: OPlume4.png|framed|none|Recommended ZOI for an Electrical Enclosure Fire. Left: Without top obstruction, Right: with top obstruction credit]]
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-[[File: OPlume5.png]]
+[[File: OPlume5.png|framed|none|Obstructed Plume Shift]]

@@ Line 10: / Line 10: @@
 [[File: OPlume1.png]]
-In order to investigate the effect of the enclosure metal top on the plume, a review of past studies and plume theory was conducted. From the review, a series of FDS simulations were conducted. The FDS simulations performed used the following parameters:
+In order to investigate the effect of the enclosure metal top on the plume, a review of past studies and plume theory was conducted. From the review, a series of FDS simulations were conducted. The FDS simulations were performed used the following parameters:
 * Room size ~ 16½ ft. square, 20 ft. height
 * Cabinet size = 1, 2, 3, 4 ft. square, 7½ ft. height

@@ Line 10: / Line 10: @@
 [[File: OPlume1.png]]
-A review of past studies and plume theory was conducted, and FDS simulations were conducted.
+In order to investigate the effect of the enclosure metal top on the plume, a review of past studies and plume theory was conducted. From the review, a series of FDS simulations were conducted. The FDS simulations performed used the following parameters:
 * Room size ~ 16½ ft. square, 20 ft. height
 * Cabinet size = 1, 2, 3, 4 ft. square, 7½ ft. height
@@ Line 19: / Line 17: @@
 * 39 unobstructed
 * 117 with obstructions
-Fire scenario configurations varied
 * HRR
 * Fire diameter
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 '''Correction to Plume Zone of Influence due to Obstructed Plume Effects'''
-An obstructed plume bias, B = 0.62, which is equivalent to a reduction of 38% for estimating the plume temperature rise is recommended for use.
+Chapter 6 discusses the impact on the fire plume modeling. The results determined that the unobstructed model overpredicts the vertical zone of influence. To correct this, an

@@ Line 6: / Line 6: @@
 The Heskestad plume correlation is typically used for unobstructed plume simulations and modified to account for changes in plume temperature due to an obstruction. This modification is estimated through a comparison of the results of fire model simulations against the existing Heskestad plume correlation.  The software used to simulate and estimate fire plume temperatures subject to obstructions in this study is FDS Version 6.0.1.
-RACHELLE-Fire presents methodology to correct for the ZOI due to the obstructed plume effect encountered in electrical enclosures.
+[https://www.epri.com/#/pages/product/000000003002005578/?lang=en-US EPRI 3002005578 / NUREG-2178] presents methodology to correct for the ZOI due to the obstructed plume effect encountered in electrical enclosures.
 [[File: OPlume1.png]]

← Older revision		Revision as of 20:15, 13 November 2018
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−	This page provides an overview of the development of the obstructed plume methodology as outlined in [https://www.epri.com/#/pages/product/000000003002005578/?lang=en-US EPRI 3002005578 / NUREG-2178]	+	This page provides an overview of the development and results of the obstructed plume methodology as outlined in [https://www.epri.com/#/pages/product/000000003002005578/?lang=en-US EPRI 3002005578 / NUREG-2178]

	'''Chapter 5:'''		'''Chapter 5:'''

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 '''Chapter 5:'''
 '''Correlation of Obstructed Plume Models with Heskestad Plume Predictions'''
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 RACHELLE-Fire presents methodology to correct for the ZOI due to the obstructed plume effect encountered in electrical enclosures.
-[[File: OPlume1.png|Tis is the caption|]]
+[[File: OPlume1.png]]
 A review of past studies and plume theory was conducted, and FDS simulations were conducted.