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Thermal Analysis of Compressible CO2 Flow for PFE TeSS Nozzle of Fire Detection SystemA thermal analysis of the compressible CO2 flow for the Portable Fire Extinguisher (PFE) system has been performed. A SINDA/FLUINT model has been developed for this analysis. The model includes the PFE tank and the TeSS nozzle, and both have initial temperature of 72 F. In order to investigate the thermal effect on the nozzle due to discharging CO2, the PFE TeSS nozzle pipe has been divided into three segments. This model also includes heat transfer predictions for PFE tank inner and outer wall surfaces. The simulation results show that the CO2 discharge rates have fulfilled the minimum flow requirements that the PFE system discharges 3.0 Ibm CO2 in 10 seconds and 5.5 Ibm of CO2 in 45 seconds during its operation. At 45 seconds, the PFE tank wall temperature is 63 F, and the TeSS nozzle cover wall temperatures for the three segments are 47 F, 53 F and 37 F, respectively. Thermal insulation for personal protection is used for the first two segments of the TeSS nozzle. The simulation results also indicate that at 50 seconds, the remaining CO2 in the tank may be near the triple point (gas, liquid and solid) state and, therefore, restricts the flow.
Document ID
20110011452
Acquisition Source
Johnson Space Center
Document Type
Conference Paper
Authors
Zhang, Y. Michael
(Lockheed Martin Space Operations Houston, TX, United States)
Lee, Wen-Chin
(Lockheed Martin Space Operations Houston, TX, United States)
Keener, John F.
(Lockheed Martin Space Operations Houston, TX, United States)
Smith, F. D.
(NASA Johnson Space Center Houston, TX, United States)
Date Acquired
August 25, 2013
Publication Date
July 15, 2002
Subject Category
Fluid Mechanics And Thermodynamics
Report/Patent Number
021CES-280
JSC-CN-7385
Meeting Information
Meeting: 2002 32nd International Conference on Environmental Systems
Location: San Antonio, TX
Country: United States
Start Date: July 15, 2002
End Date: July 18, 2002
Sponsors: Society of Automotive Engineers, Inc.
Funding Number(s)
OTHER: 477-7211
Distribution Limits
Public
Copyright
Other

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