Go Back   InterNACHI Inspection Forum > >

Notices

Inspection Question of the Week These are inspection questions posted weekly by members of InterNACHI's Awards Committee.

Reply
 
Thread Tools
  #31  
Old 5/17/18, 3:14 PM
Larry Kage, CMI's Avatar
Larry Kage, CMI Larry Kage, CMI is offline
Certified Master Inspector ®
 
Join Date: Jul 2004
Location: NW, MI
Posts: 17,110
Default Re: Questions of the Week 05/13/2018

Quote:
Originally Posted by snadeau View Post
Very informative - thank you. The books are a bonus, but the learning keeps me coming back.
Thanks, Steve, the Awards Committee hopes that is what it is about.

We appreciate ALL those who take the time to participate.




Awards Committee Officer
SUBMIT YOUR AWARD NOMINATIONS HERE:
http://co.nachi.org/inachiawards/

The InterNACHI Awards Committee is the final authority of issuance of any award the committee offers.
____________________________________________

Larry Kage, CMI 2004-2017
State Licensed Builder since 1973
InterNACHI Lifetime Member
~retired~

The above post represents my personal opinion.
Reply With Quote
Need a home inspection in Delaware? Check out InterNACHI's listing of Delaware certified home inspectors. Or, find a home inspector anywhere in the world with our inspection search engine.
  #32  
Old 5/17/18, 7:48 PM
Chuck Evans's Avatar
Chuck Evans Chuck Evans is online now
Certified Master Inspector ®
 
Join Date: Sep 2006
Location: Stagecoach, TX
Posts: 10,027
Default Re: Questions of the Week 05/13/2018

I'm heading for Colorado in the wee hours of the morning so rather than leave folks hanging, the answers are below.

I wanted to make this one a bit challenging. I didn't intend to make it insurmountable. Thanks to all who participated.

Chuck


Answers:

1. A solid object that is opaque to infrared radiation and is a good reflector of infrared radiation will be a _____ emitter of infrared radiation.
A. strong
B. poor (For opaque objects reflectivity and emissivity are complementary and combined always equal 1.0. The more reflective an object is, the less emissive it is.)
C. unpredictable based on information provided... (explain)
2. Ordinary glass is opaque to infrared radiation.
True
False
It depends on the infrared wavelength. Glass is opaque to long wave infrared (LWIR), which is what most thermal imagers detect, but not short wave infrared (SWIR). If you image an incandescent light bulb with a LWIR imager, you will see the heat radiated from the glass itself. A SWIR imager can actually see the filament inside the light bulb.
3. The emissivity of an object may be affected by (identify all that are FALSE).
A. the surface smoothness of the object
B. the shape of the object
C. the angle at which the object is viewed
D. the temperature of the object
E. the color of the object
F. the IR wavelength
4. If you plug the appropriate emissivity of an object into your infrared imager, it will give you an accurate representation of the actual temperature of that object.
True
False (there are multiple other parameters to set and factors to take into account in order to be able to accurately determine temperature)
5. Decreasing the emittance value of your imager will cause the observed temperature to go ____
Up
Down
It depends on whether the reflected temperature is higher or lower than the target object temperature. If the reflected temperature is higher than the object temperature reducing the emissivity value will cause the observed temperature to go down. If the reflected temperature is lower than the object temperature, reducing the emissivity value will cause the observed temperature to go up.

Bonus question (the prize is bragging rights): How do Low-E windows for hot climates differ from Low-E windows for cold climates and why?

In very hot climates, the Low-E coating should be on surface #2 (reducing the ability of the outer glass to radiate heat into the structure across the space between the panes). In very cold climates, it goes on surface #3 (reducing the ability of the inner pane to radiate heat out of the structure across the space between the panes).

Surfaces are numbered from the outside in: The outside surface of outside pane is #1; The inside surface of outside pane is #2; The outside surface of the inside pane is #3; the inside surface of the inside pane is #4



Chuck Evans (TREC #7657)
Level III Infraspection Institute Certified Infrared Thermographer (#8402)
HomeCert Houston Home Inspections & Thermal Inspections Find us on Facebook
The Woodlands Home Inspection


Houston, TX
_______________________
Awards Committee Member

SUBMIT YOUR AWARD NOMINATIONS HERE

The InterNACHI Awards Committee is the final authority of issuance of any award the committee offers.

Last edited by cevans; 5/17/18 at 8:30 PM..
Reply With Quote
  #33  
Old 5/17/18, 8:24 PM
Dave Fetty, CMI's Avatar
Dave Fetty, CMI Dave Fetty, CMI is online now
Certified Master Inspector ®
 
Join Date: Feb 2014
Location: Naples all SWFL
Posts: 10,620
Default Re: Questions of the Week 05/13/2018

Excellent questions and a true learning opportunity, thank you for your time. Enjoy your trip to CO.




Dave Fetty Certified Master Inspector
Florida Home Inspection And Property Services LLC
www.FHIAPS.COM
www.NaplesBestInspector.com
www.FortMyersInspector.com
Naples, Marco Island, Ft. Myers, Bonita Springs, Estero, Cape Coral
Dfetty@FHIAPS.COM
http://https://www.facebook.com/pages/Flori...2450912?ref=hl
Florida Radon Measurement Technician R2547
(239)339-7380
Reply With Quote
  #34  
Old 5/17/18, 10:07 PM
Marc A. Goldenberg's Avatar
Marc A. Goldenberg Marc A. Goldenberg is offline
Certified Professional Inspector (CPI) ®
 
Join Date: Feb 2004
Location: Boca Raton, FL
Posts: 5,942
Default Re: Questions of the Week 05/13/2018

Quote:
Originally Posted by cevans View Post
I'm heading for Colorado in the wee hours of the morning so rather than leave folks hanging, the answers are below.

I wanted to make this one a bit challenging. I didn't intend to make it insurmountable. Thanks to all who participated.

Chuck


Answers:

1. A solid object that is opaque to infrared radiation and is a good reflector of infrared radiation will be a _____ emitter of infrared radiation.
A. strong
B. poor (For opaque objects reflectivity and emissivity are complementary and combined always equal 1.0. The more reflective an object is, the less emissive it is.)
C. unpredictable based on information provided... (explain)
2. Ordinary glass is opaque to infrared radiation.
True
False
It depends on the infrared wavelength. Glass is opaque to long wave infrared (LWIR), which is what most thermal imagers detect, but not short wave infrared (SWIR). If you image an incandescent light bulb with a LWIR imager, you will see the heat radiated from the glass itself. A SWIR imager can actually see the filament inside the light bulb.
3. The emissivity of an object may be affected by (identify all that are FALSE).
A. the surface smoothness of the object
B. the shape of the object
C. the angle at which the object is viewed
D. the temperature of the object
E. the color of the object
F. the IR wavelength
4. If you plug the appropriate emissivity of an object into your infrared imager, it will give you an accurate representation of the actual temperature of that object.
True
False (there are multiple other parameters to set and factors to take into account in order to be able to accurately determine temperature)
5. Decreasing the emittance value of your imager will cause the observed temperature to go ____
Up
Down
It depends on whether the reflected temperature is higher or lower than the target object temperature. If the reflected temperature is higher than the object temperature reducing the emissivity value will cause the observed temperature to go down. If the reflected temperature is lower than the object temperature, reducing the emissivity value will cause the observed temperature to go up.
Bonus question (the prize is bragging rights): How do Low-E windows for hot climates differ from Low-E windows for cold climates and why?

In very hot climates, the Low-E coating should be on surface #2 (reducing the ability of the outer glass to radiate heat into the structure across the space between the panes). In very cold climates, it goes on surface #3 (reducing the ability of the inner pane to radiate heat out of the structure across the space between the panes).

Surfaces are numbered from the outside in: The outside surface of outside pane is #1; The inside surface of outside pane is #2; The outside surface of the inside pane is #3; the inside surface of the inside pane is #4
GREAT job as usual Chuck!
Thank you



http://www.alltropic.com


~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~

Awards Committee Member
SUBMIT YOUR AWARD NOMINATIONS HERE

The InterNACHI Awards Committee is the final
authority of issuance of any award the committee offers.
Reply With Quote
  #35  
Old 5/18/18, 1:31 AM
Larry Kage, CMI's Avatar
Larry Kage, CMI Larry Kage, CMI is offline
Certified Master Inspector ®
 
Join Date: Jul 2004
Location: NW, MI
Posts: 17,110
Default Re: Questions of the Week 05/13/2018

Quote:
Originally Posted by mgoldenberg View Post
GREAT job as usual Chuck!
Thank you

Ditto!!




Awards Committee Officer
SUBMIT YOUR AWARD NOMINATIONS HERE:
http://co.nachi.org/inachiawards/

The InterNACHI Awards Committee is the final authority of issuance of any award the committee offers.
____________________________________________

Larry Kage, CMI 2004-2017
State Licensed Builder since 1973
InterNACHI Lifetime Member
~retired~

The above post represents my personal opinion.
Reply With Quote
  #36  
Old 5/18/18, 6:48 AM
Marcel R. Cyr, CMI's Avatar
Marcel R. Cyr, CMI Marcel R. Cyr, CMI is offline
Certified Master Inspector ®
 
Join Date: Jul 2004
Location: Winslow, ME
Posts: 30,082
Default Re: Questions of the Week 05/13/2018

Thanks Chuck



CMI 2004-2017 Retired

Awards Committee Member
U.S. Member of the Year Winner 2009
45 Years Residential/Commercial Builder
Submit your AWARDS NOMINATIONS here
The InterNACHI Awards Committee is the final authority of issuance of any award the committee offers.
Reply With Quote
  #37  
Old 5/18/18, 7:27 AM
Madison Moore's Avatar
Madison Moore Madison Moore is offline
Certified Professional Inspector (CPI) ®
 
Join Date: Nov 2017
Location: Evanston, IL
Posts: 84
Default Re: Questions of the Week 05/13/2018

Thanks Chuck!





Madison Moore, CPI
Framework Home Inspections Inc.
Evanston, IL
224-277-2332
Madison@frameworkhi.com
www.frameworkhi.com
www.frameworkhomeinspections.com
Reply With Quote
  #38  
Old 5/18/18, 11:26 AM
Steve Nadeau's Avatar
Steve Nadeau Steve Nadeau is offline
Certified Professional Inspector (CPI)
 
Join Date: May 2014
Location: Denver
Posts: 772
Default Re: Questions of the Week 05/13/2018

Good job Chuck. Don't eat the Colorado brownies, but do stop by every brewery you get the opportunity to.
Reply With Quote
  #39  
Old 5/18/18, 7:41 PM
Chuck Evans's Avatar
Chuck Evans Chuck Evans is online now
Certified Master Inspector ®
 
Join Date: Sep 2006
Location: Stagecoach, TX
Posts: 10,027
Default Re: Questions of the Week 05/13/2018

Thanks guys. I usually hit at least one brewery when I go. Hails was pretty crazy. Looks like more to come.



Chuck Evans (TREC #7657)
Level III Infraspection Institute Certified Infrared Thermographer (#8402)
HomeCert Houston Home Inspections & Thermal Inspections Find us on Facebook
The Woodlands Home Inspection


Houston, TX
_______________________
Awards Committee Member

SUBMIT YOUR AWARD NOMINATIONS HERE

The InterNACHI Awards Committee is the final authority of issuance of any award the committee offers.
Reply With Quote
  #40  
Old 5/19/18, 12:03 PM
William B. Ogletree's Avatar
William B. Ogletree William B. Ogletree is online now
Certified Professional Inspector (CPI) ®
 
Join Date: Apr 2017
Location: Grapevine, Texas
Posts: 894
Default Re: Questions of the Week 05/13/2018

Answers (without looking at responses)

1 - B
2 - Depends. If the glass is in contact with a hot item, the imager will detect heat on the opposite side of the glass at the point of contact.
3 - DEF
4 - False
5 - Up

A little more than halfway through Level I. This was a very educational QOTW. Thanks!




William Bruce Ogletree
Ogletree Inspection Services

214-287-4630
www.ogletreehi.com
ogletreehi@gmail.com

Last edited by wogletree; 5/19/18 at 12:14 PM..
Reply With Quote
  #41  
Old 5/19/18, 12:15 PM
Roy Lewis, CMI's Avatar
Roy Lewis, CMI Roy Lewis, CMI is online now
Certified Master Inspector ®
 
Join Date: Nov 2012
Location: North Florida
Posts: 12,546
Default Re: Questions of the Week 05/13/2018

He already gave the answers. See post 32.




InterNACHI Lifetime Member.
www.1stproinspection.com
roy@1stproinspection.com
Serving Gainesville Florida and surrounding areas.
Florida Certified Contractor #CRC1328001
Florida Certified Home Inspector #HI7019
Deus solus me iudicare potest
#1st Pro Inspection
Reply With Quote
Reply

Thread Tools

Posting Rules
You may not post new threads
You may not post replies
You may not post attachments
You may not edit your posts

BB code is On
Smilies are On
[IMG] code is On
HTML code is Off


All times are GMT -4. The time now is 12:48 AM.
no new posts