fundamentals of making energy-saving and cost-efficient ... · chimney design 1996 edition chimney...
TRANSCRIPT
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Fundamentals of Making Energy-Saving
and Cost-Efficient Boiler Exhaust Systems
– Design Solutions and Applications
ASHRAE Qatar Oryx Chapter – 10th November 2012
Presenter: Steen Hagensen
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Make the unimaginable and impossible POSSIBLE!
A guide for using the ASHRAE’s chimney design
equation to design boiler exhaust systems that
save space, reduce installation cost and energy -
and allow the designer to design systems that
normally would be deemed impossible
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Z223.1-NFPA54 / International Fuel
Gas Code (Venting of equipment)
Minimum Safe Performance
A venting system shall be designed and constructed so as to
develop a positive flow adequate to remove flue or vent gases
to the outside atmosphere.
Equipment Draft Requirement
A venting system shall satisfy the draft requirement of the
equipment in accordance with the manufacturer’s instructions.
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ASHRAE 90.1 – Boiler Efficiency
• Current average boiler use:
6570 hours per year
• Current average operating
efficiency: 77%
• Efficiency threshold: 85%
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Boiler Draft vs Efficiency
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ASHRAE Chimney Design Equation
INPUTS:
• Appliance Type
• Fuel Type
• kW Input
• CO2% in Flue Gases
• Flue Gas Temperature
• Ambient Temperature
• Altitude
• Flue Layout
RESULTS:
• Flue Gas Volume
• Flue Gas Velocity
• Theoretical Draft
• Total Pressure Losses
• Appliance Outlet Pressure
Outlet Pressure
Theoretical Draft (-)
+ Pressure Losses (+)
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10’
Theoretical Draft: • Chimney Height
• Flue Gas Temperature
• Surrounding Temperature
• Barometric Pressure
Pressure Loss: • Flue Gas Volume
• Total Resistance
- 7 Pa
1,000 MBH Forced Draft
10” Flue
Difference at Outlet: • Specified by Equipment
• Efficiencies
• Safety
+ 8 Pa
- 15 Pa
Chimney Design
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10’
Theoretical Draft: • Chimney Height
• Flue Gas Temperature
• Surrounding Temperature
• Barometric Pressure
Pressure Loss: • Flue Gas Volume
• Total Resistance
+ 7 Pa
1,000 MBH Forced Draft
10” Flue
5’
Difference at Outlet: • Specified by Equipment
• Efficiencies
• Safety
+ 22 Pa
- 15 Pa
Chimney Design
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30’
Theoretical Draft: • Chimney Height
• Flue Gas Temperature
• Surrounding Temperature
• Barometric Pressure
Pressure Loss: • Flue Gas Volume
• Total Resistance
- 34 Pa
1,000 MBH Forced Draft
10” Flue
11 Pa
- 45 Pa
Difference at Outlet: • Specified by Equipment
• Efficiencies
• Safety
Chimney Design
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1996 Edition Chimney Equation Default Values: 8.5% CO2, 60o F Ambient, 360o F Flue Gas, & Sea Level
Appliance Values: 1,000 MBH Input with 8” Diameter Flue Outlet
Flue or Chimney Layout: • 8” Diameter
• 20’ Vertical
• 0’ Lateral
• No Fittings
Results: - 27 Pa Natural Draft
+ 26 Pa Pressure Loss
- 1 Pa at Flue Outlet
Chimney Design
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Chimney Design 1996 Edition
Chimney Equation Default Values: 8.5% CO2, 60o F Ambient, 360o F Flue Gas, & Sea Level
Appliance Values: 1,000 MBH Input with 8” Diameter Flue Outlet
Flue or Chimney Layout: • 8” Diameter
• 20’ Vertical
• 5’ Lateral
• (2) Fittings
Results: - 27 Pa Natural Draft
+ 48 Pa Pressure Loss
+ 21 Pa at Flue Outlet
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Chimney Design 1996 Edition
Chimney Equation Default Values: 8.5% CO2, 60o F Ambient, 360o F Flue Gas, & Sea Level
Appliance Values: 1,000 MBH Input with 8” Diameter Flue Outlet
Flue or Chimney Layout: • 10” Diameter
• 20’ Vertical
• 5’ Lateral
• (2) Fittings
Results: - 27 Pa Natural Draft
+ 19 Pa Pressure Loss
- 8 Pa at Flue Outlet
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Chimney Design 1996 Edition
Chimney Equation Default Values: 8.5% CO2, 60o F Ambient, 360o F Flue Gas, & Sea Level
Appliance Values: 1,000 MBH Input with 8” Diameter Flue Outlet
Flue or Chimney Layout: • 10” Diameter
• 10’ Vertical
• 5’ Lateral
• (2) Fittings
Results: - 13 Pa Natural Draft
+ 18 Pa Pressure Loss
+ 5 Pa at Flue Outlet
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1996 Edition
Chimney Design Chimney Equation Default Values: 8.5% CO2, 60o F Ambient, 360o F Flue Gas, & Sea Level
Appliance Values: 1,000 MBH Input with 8” Diameter Flue Outlet
Flue or Chimney Layout: • 12” Diameter
• 10’ Vertical
• 5’ Lateral
• (2) Fittings
Results: - 13 Pa Natural Draft
+ 8 Pa Pressure Loss
- 5 Pa at Flue Outlet
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Natural Draft Boiler Exhaust System
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Modulating Boiler Exhaust System
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NFPA 54
IAS (A.G.A.)
ANSI Z
223.1
Appliance Categories
NFPA 54 / International Fuel Gas Code
• Category I
• Category II
• Category III
• Category IV
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IV
III
II
I
Appliance Categories
Atmospheric Forced Draft – non-condensing
Fan-Assisted Forced Draft – condensing
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IV
III
II
I
Chimney Flue/ Vent Material
Aluminium Liner Stainless Steel 316 inner, 304 outer
Stainless Steel 316 inner, 304 outer Stainless Steel 316 inner, 304 outer
+ -
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Modern System Design
• Design Software
• Vent type application
• Operating temperature
• Resistance factors
• Ambient temperature
variations
• Code violations
Demand-Controlled Boiler Exhaust Systems
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Example – Over-draft Application
100 m
Draft
Control
Damper
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Example – Over-draft Application
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Example – Downsize
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Example – Downsize
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Example – Downsize 24 inch (610 mm) boiler exhaust
18 inch (450 mm) boiler exhaust
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Why Packaged Boiler Exhaust
Systems?
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Benefits of Packaged
Boiler Exhaust Systems Where
• Hotels / Resorts / Apartment Buildings
• Hospitals
What
• Steam boilers
• Calorifiers / Water Heaters
Why
• Save space, Save material – use smaller chimney
• Reduce number of chimneys
• Avoid “over-crowded” boiler-rooms
• Aesthetics
• Safety and redundancy
• Single supplier responsibility
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Boiler Exhaust System And Over-draft Control Or Fan-Powered Chimney
Stainless steel boiler exhaust (316/304), 25 mm insulation
Modulating fan control with boiler interlock
Boiler exhaust fan (variable speed)
Modulating Over-Draft Damper
Packaged Boiler Exhaust Systems
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Packaged Boiler Exhaust Systems
Boiler exhaust
with safety
controls
Boiler exhaust
with over-draft
control
Boiler exhaust with
over-draft control and
modulating draft
control
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IPVB 300 - 685 – Inline Power Venter
• SS316L construction
• Direct drive, TEFC variable
speed motor
• Maintenance free
• 575ºF Continuous
• All gas-fired or oil-fired
boilers
• Simple design with few
components reduces the
risk of failure and simplifies
service
• UL 378 – Draft Equipment
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IPVB 300 - 685 – Inline Power Venter
Motor and impeller drive
unit can be removed
without removing the fan
from the stack system
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Modulating Over-Draft Damper System MDF Damper
• Sizes – 12 in. to 48 in. diameters
• Multiple opposed blades made of 16 gauge type 316 stainless
• Pressure stack flange connections
• Rated to 700°F
EBC30
• Prime function
• Additional over-pressure protection for Forced-draft boilers
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IPVB 300 - 500 – Power Venter
Anywhere You Want It
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ENERVEX Chimney Flue
EPS
High Pressure Twin-Wall
Stainless Steel Multi-Purpose
Exhaust Duct and Chimney
System
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One Chimney Flue – EPS Multi-Purpose
• Building Heating
Chimney – condensing
and non-condensing
• Engine/Generator
Exhaust
• Grease Duct / Kitchen
Exhaust
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Chimney Flue - EPS
• Inner Liner:
316L stainless steel, 1mm
thick (1.2mm for diameters
of 1000mm and above)
• Outer wall:
304 stainless steel, 0.6mm
thick (0.8mm for diameters
of 700mm and above)
• Insulation
25-100mm thick fiber
insulation
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Chimney Flue - EPS
• Welded continuous
construction
• Integral flange at each end
• Male insert for easy
centering and assembly
• Graphite seal (no messy
silicone sealant)
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Chimney Flue - EPS
• Easy and accurate
assembly
• Hinged v-band
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Generator & Engine Exhaust
• NFPA37, Standard for
Emergency Generators
• 60” (1500mm) W.C.
pressure capability
• 1400°F (760°C)
• 2-4” (25-100mm) insulation
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Boiler Exhaust
• UL103 Building Heating
Chimney
• UL1738 Chimney for
Condensing Heating
Appliances
• 60” (1500mm) W.C.
pressure capability
• 1400°F (760°C)
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Kitchen Exhaust
• UL 1978 Grease Duct
Exhaust System
• Thermal expansion
compensation
• Clean-out access
• No welding
• Easy hood and fan
connection
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Space Saving & Aesthetics
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Space Saving
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Space Saving
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Aesthetics
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Design Freedom
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Crowded Boiler Rooms
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Redundancy for Critical Installations
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Energy Savings
Demand-Controlled boiler exhaust system
Demand-Controlled boiler exhaust System with Heat Recovery
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Case Studies/Design Examples
How to get the most out of a creative design ……
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Burj KhalifaTower / Armani Hotel,
Dubai
Six Demand Controlled Boiler Exhaust
Systems servicing horizontal venting for side
wall termination providing the
engineers full
flexibility in the
design
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Khalidiya Palace, Abu Dhabi
Three boilers common vented with a
Demand Controlled Boiler Exhaust
System using an inline boiler exhaust
fan. Savings on material cost over $
30,000
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Capital Plaza (Sofitel Hotel), Abu
Dhabi Four boilers common vented with a Demand
Controlled Boiler Exhaust System using an
inline boiler exhaust fan. Savings on material
cost over $ 60,000
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Jumeirah Creekside Hotel, Dubai
Four boilers common vented with a
Demand Controlled Boiler Exhaust
System using an inline boiler exhaust
fan. Savings on material cost over $
60,000.
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Why is This Attractive?
• Single supplier responsibility.
• Space savings = cost savings
• Small footprint = less space required
• Save energy and reduce emissions
• Improve boiler room safety
• Enhance aesthetics
Make the unimaginable and impossible
POSSIBLE.
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A Final Note
“Chimney system must be designed/approved/supplied by boiler
manufacturer”
Let boiler experts deal with the boiler design
Let chimney design experts deal with the chimney design
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Questions?
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Contact Information
Steen Hagensen
+1 770 587 3238
Jad Rajeh
+974 3328 8614
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