Dometic-1 - November 22, 2001 American Eagle MH Note...

Info iconThis preview shows pages 1–12. Sign up to view the full content.

View Full Document Right Arrow Icon
Note characteristi c “V” pattern Origin considered to coincide with base of the “V” November 22, 2001 – American Eagle MH November 22, 2001 – American Eagle MH Total loss - $200,000 Total loss - $200,000
Background image of page 1

Info iconThis preview has intentionally blurred sections. Sign up to view the full version.

View Full DocumentRight Arrow Icon
Dometic refrigeration unit suspected [by plaintiff experts] as containing the location of origin of the fire Ammonia absorption refrigeration – no moving parts absorber coils absorber coils condenser condenser absorber absorber tank tank boiler boiler evaporator evaporator [low T] [low T] evaporator evaporator [high T] [high T]
Background image of page 2
Heat delivered to boiler vaporizes NH 3 supplied by absorber tank • NH 3 vapor condensed in condenser unit • H 2 [350 psi] mixes with NH 3 [44 psi], lowering NH 3 vapor pressure, causing it to vaporize, extracting heat • NH 3 vapor reabsorbed by Principles of Operation for NH Principles of Operation for NH 3 Absorption Refrigeration Absorption Refrigeration
Background image of page 3

Info iconThis preview has intentionally blurred sections. Sign up to view the full version.

View Full DocumentRight Arrow Icon
1380 cm 3 of aqueous solution • 33.3% [460 g] NH 3 • < 2% [27.6 g] Na 2 CrO 4 [corrosion inhibitor], an oxidant • 14.4 g H 2 , equivalent to an internal pressure of ~500 psi @ 75 o F Specifications and Nominal Operating Specifications and Nominal Operating Conditions [Dometic Technical Conditions [Dometic Technical Representative] Representative] the Refrigerant: the Refrigerant: Boiler heating generates temperatures < 400 o F with coolant in system When coolant removed, boiler temperatures can reach 1150 o F Operating Temperatures Operating Temperatures
Background image of page 4
close-up of boiler/heater components close-up of boiler/heater components • Chimney [C 3 H 8 combustion products] Electrical [AC] resistance heater Boiler tube • C 3 H 8 burner • C 3 H 8 igniter
Background image of page 5

Info iconThis preview has intentionally blurred sections. Sign up to view the full version.

View Full DocumentRight Arrow Icon
boiler/electric heater after removal boiler/electric heater after removal resistance heating element boiler
Background image of page 6
boiler/electric heater after sectioning boiler/electric heater after sectioning Chimney Boiler Resistance heater • C 3 H 8 burner igniter boiler tube split boiler tube split
Background image of page 7

Info iconThis preview has intentionally blurred sections. Sign up to view the full version.

View Full DocumentRight Arrow Icon
sectioned area after longitudinal split sectioned area after longitudinal split crack crack Note inversion of indentation in boiler tube [outward bulge]
Background image of page 8
The Dimple That wasn’t There… The Dimple That wasn’t There… Dimple or indentation introduced in order to increase area of heat transfer surface, increasing efficiency of NH 3 vaporization Plaintiff’s experts ignored it & its significance
Background image of page 9

Info iconThis preview has intentionally blurred sections. Sign up to view the full version.

View Full DocumentRight Arrow Icon
sectioned area containing boiler leak site – sectioned area containing boiler leak site – macro image macro image chimney weld boiler weld heating element fracture [in HAZ] fracture [in HAZ]
Background image of page 10
boiler interior [after longitudinal sectioning] boiler interior [after longitudinal sectioning] electrical heater electrical heater
Background image of page 11

Info iconThis preview has intentionally blurred sections. Sign up to view the full version.

View Full DocumentRight Arrow Icon
Image of page 12
This is the end of the preview. Sign up to access the rest of the document.

This note was uploaded on 07/24/2011 for the course EMA 4714 taught by Professor Staff during the Spring '08 term at University of Florida.

Page1 / 35

Dometic-1 - November 22, 2001 American Eagle MH Note...

This preview shows document pages 1 - 12. Sign up to view the full document.

View Full Document Right Arrow Icon
Ask a homework question - tutors are online