Energy Auditing Home inspections & … Auditing Home inspections & Weatherization with Thermal...
Transcript of Energy Auditing Home inspections & … Auditing Home inspections & Weatherization with Thermal...
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Energy Auditing
Home inspections &
Weatherization
with Thermal Imagers
Peter HacheyPeter Hachey
Fluke Electronics Canada LPFluke Electronics Canada LP
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Agenda
• General Introduction
• Thermography Principles
• Inspecting with IR
• Thermal Imaging in the Building Envelope
• Other Applications• Other Applications
• How to choose a thermal imager
• IR analysis and reporting software
• Summary
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Overview of ThermographyKnowing a little about thermography helps!
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What is Thermography?
• Infrared radiation is emitted by all objects
• The amount of radiation increases with temperature
• It is the science of “seeing” temperature by measuring the
radiation emitted from an object and converting this data to a
corresponding digital, or visual image called a thermogram
• We are only measuring the surface temperature!
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What Does a Thermal Imager Do?
• Displays the thermal patterns on a given surface by converting temperature data to a digital image
• Provides visual verification and • Provides visual verification and documentation of problems, before and after
• Reduces liability, improves efficiency, adds revenue stream
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Why Thermal Imaging?
• Easier & more effective inspection
• Customers request it
• Be more competitive
• Build a business or…• Build a business or…
• Add to your business portfolio
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Thermography Benefits
• Measurements are:
– Non-contact
– Obtained without disturbing structure
– Very sensitive to problem – Very sensitive to problem characteristics
– Detect problem before significant damage
– Can scan large areas quickly
– Identifies specific location
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What Do We Look For?
• Air infiltration– Energy use
– Comfort
• Insulation issues
• Moisture
• Construction problems
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Where Do We Look?
• Indoor– Walls– Floors– Ceilings– Ducts
• Exterior– Thermal bridging– Windows & doors– Construction joints
• Roofs
• HVAC/R
• Electrical and Mechanical Systems
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Air Leaks Become Visible!
• Fast location of air leaks and missing insulation
• Non-destructive
• Easily document & report findings to property ownerproperty owner
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Three Modes of Heat Transfer
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Heat Transfer
• Heat transfer can be:
– Transient: temperature is constantly and significantly changing
– Steady state: heat flow is constant with time
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Thermal Capacitance
• The amount of energy an object needs to absorb or release in order to change temperature
– Water heats and cools slowly because of its high heat capacity
– Air heats and cools rapidly because of its low heat capacitylow heat capacity
• How quickly this change take place depends on thermal capacitance and thermal conductivity – not time.
• Which has the highest thermal capacitance?
– Copper– Steel– Brick– Wood– Water
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Successful IR Audit
• Air Leaks – ASTM E-1186
– ∆T of 5°C for Air Leak Inspection
• Insulation – ASTM C-1060
°– ∆T of 10°C for Insulation Inspection
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Inspecting with IR
• Stabilize home
• Turn HVAC off 10-15 min after arrive – before scan
• Perform visual inspection of building envelope
• Work systematically – follow route
• IR image appears hot or cold depending on climate• IR image appears hot or cold depending on climate
• Inspect from both inside and outside
• Validate findings with other tools
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Range, Level & Span
• Range
• Span
• Level
• Saturation Colors
Span = 30°°°°FLevel =65°°°°F
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Level and Span
keep span narrow and adjust level as needed
Auto Manual
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Focus is CRITICAL
• Focusing an IR imager is different than a visible camera
– Infrared images are naturally less sharp 283.8°
• Best focus is critical for accurate temperature measurements
• Anything but focus can be modified/optimized later with PC software
362.2°
Unfocused Image
Focused Image
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Air Leaks
• Common causes:
– Door & window gaps
– Exterior wall electrical outlets
– Recessed lights
– Attic penetrations
Image Courtesy of Structure Tech Home Inspections
– Attic penetrations
– Ducts / Vents
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Air Leaks
• Locate exact leak point
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Insulation
• Common causes:
– Missing
– Settled
– Wet
– Insufficient– Insufficient
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Moisture or Air Infiltration?
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Moisture
• Implications:
• Wet insulation does not perform
• Insulation settles
• Mold• Mold
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IR Moisture Detection
Evaporative Moisture Cooling (EMC)
– Wet materials evaporating water will
reduce the surface temperature in a
controlled environment until controlled environment until
equilibrium is reached (dry)
– EMC causes thermal anomaly on
surface, even when surface is dry
– Temperature difference can be >0.2°CMOISTURE
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37 Master Thermography Presentation – JWP-4
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Moisture Intrusion
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Moisture in ceiling
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Detecting Water Leaks
40 Master Thermography Presentation – JWP-4
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Moisture
• Water entering building structure through:
– leaks in building envelop
– failed and poorly installed plumbingplumbing
• Condensation caused by:
– improper construction
– poor building management
– air leakage
All of which can cause health, comfort, safety and financial issues
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MOISTURE
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Other application for thermography
• Electrical
• Mechanical
• Electro-mechanical
• HVAC
• Roofs (flat to low slope types only)
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Roof Inspections
• Visually inspect roof before day of survey
• Plan inspection grid
• Make note of obstacles
• Know the roof type!• Know the roof type!
• Monitor the weather closely
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47
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Electrical Inspections
• Easily find electrical problems at the panel or on mechanical equipment
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Steam Traps
Normal
Faulty
When operating properly,
the steam side is hotter
and the condensate side is
cooler.
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Other!
Alarm threshold set at 40°C Alpha Blending set at 50%
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How to choose a thermal imager
• STEP 1: Analyse your needs
• STEP 2: Speak to an expert
• STEP 3: Talk with your peers
• STEP 4: Work with a local supplier
• STEP 5: Take a test drive!
10/24/2011 Fluke Confidential 53
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What is Your Application?
Building Diagnostics / Inspection
• Thermal imagers designed for this
• Measure smaller range of temperatures than industrial thermal imagers
• Require high thermal sensitivity
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Look for the following Features
• Image fusion Technology
• Large crisp images
• Made for rough environments
– Documented and proven drop tests
• Easy-to-use
• Flexible data storage• Flexible data storage
• Voice annotation
• Simple and full-featured analysis and reporting software
– Ideally, should be included free of charge• Maximum warranty included free
– 2 year warranty should be the minimum
• Look for “The complete package”
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More detailed featuresDesigned to help you work more efficiently in the
field:
• Adjustable Emissivity
• PIP and image blending functions
• Level and Span adjustment• Level and Span adjustment
• Image Format (e.g. jpg, bmp, etc.)
• Voice Annotation
• Selectable Temp Scale (scales F and C)
• Date Format
• Time Format
• Camera screen back light
• Background Temp adjustment
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Field replaceable lenses
• Must be easy to add at any time
• Easy to install (avoid fragile on-board
electronics)
• Typical lens in Building Diagnostics:
Wide angle
Wide-angle LensTelephoto Lens
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• Create professional reports
• Look for software which is included at
no additional charge, with no license
agreement and no costly upgrades
Analysis and Reporting Software
agreement and no costly upgrades
• You can optimize everything besides
focus, range and distance (FoRD) in
the software afterwards
• Customizable templates makes your
life easier!
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Example of IR software:
Modify:
- Temperature range, color palette, emissivity, background temperature,
IR/visual image blending, and add markers and text annotations
�Export Images & Temp Data to Word / Excel
� Create reports in off-the-shelf word processing software (MS Word)
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Questions?
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Thank You!
Peter Hachey
Level I Thermographer
Fluke Electronics Canada LP
1-800-363-5853 x251