1:5:10:365 EcoTip Blog

December 20, 2008

:355 Thermal Heat Detector

Take the 1:5:10:365 challenge: Do one thing – for 5 to 10 minutes – 365 days a year to make our home and planet environment better.

1:5:10:355 EcoTip: Air infiltration and missing insulation in our homes is a major energy waster. Thermal imaging is a sophisticated way to have your home analysed for these issues – but Black and Decker has come up with an inexpensive do-it-yourself Thermal Heat Detector. It allows you to set a base temperature and then scan for temperature variations – which can indicate energy loss.



 Additional Information:

Suggested Review: :040, :041, :042, :043, :044

In the winter if you are inside the house, one would look for cold spots. Standing outside one would look for warm spots. If you are using it during the summer it would be the opposite.

More information is available at: http://www.blackanddecker.com/productguide/product-details.aspx?productid=20626

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September 30, 2008

:274 Cool Pavement

Welcome to today’s 1:5:10:365 Tip for becoming a better steward for our home and planet environment.

1:5:10:274 EcoTip: Cool pavement is more reflective so it doesn’t build up as much heat as asphalt. This has the advantage of increasing the amount of light available because it is reflected off of the ground. When light is absorbed by asphalt or other dark surface materials the wavelength changes to heat energy that can contribute to the heat island effect in cities and higher cooling costs for individual buildings. The temperature of asphalt can be as much as 70 degrees F (40 degrees C) hotter than light colored paving.


Source: Heat Island Group


 Additional Information:

Suggested Review: :273

You can learn more about the heat island effect cool roofs and cool pavement from the Heat Island Group  

Tomorrow’s 1:5:10:365 EcoTip is about how cool pavement can also benefit from being pervious.

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April 20, 2008

:111 Fill a Bag – Checking HVAC Flow

 Welcome to today’s 1:5:10:365 Tip for becoming a better steward for our home and planet.

1:5:10:111 EcoTip: In order for central air conditioning systems to function efficiently, it is necessary for them to be free of significant leaks and be balanced. This means that the air supply is flowing somewhat equally throughout the system. In an unbalanced system you might have too much air going to one area and not enough in others. There are sophisticated duct balancing systems that can be used to professionally perform these checks, but an inexpensive simple do-it-yourself method was developed by the Canadian Mortgage and Housing Administration using a plastic garbage bag, coat hanger, duct-tape and a timer.

image credit: Lawrence Berkeley National Laboratory


Additional Information

Suggested Review – :110

The CMHC says to use a Glad 66 cm x 91 cm garbage bag. Which is about 2ft X 3ft when it is laid out flat. The coat hanger is bent into a circle, shape that will fit all the way around the heating and cooling supply registers you have in your home. You may need to reshape it for different openings. Tape the edge of the plastic bag to the coat hanger.

To test your duct system – turn your HVAC fan unit to on. It is not necessary to have it actually heating or cooling  –  just blowing. Place the completely deflated garbage bag over a supply register and time how long it takes the bag to inflate completely. Record this time for all the supply registers. Now place the fully inflated garbage bag over each return register record how long it takes for the bag to deflate.

The total inflation time for the supply registers should equal the total deflation time for the return registers. If there is only one return register, you may find it deflates too quickly to measure accurately. In this case you might try using two bags simultaneously over the return register.

If it takes 2 seconds for bag to inflate that is approximately 75 cubic feet of air per minute coming into the room. This is pretty good for a standard size room. Same size rooms should have approximately the same amount of air delivered to them. Half size rooms should have about half the air. Serious deviations should be checked. A duct may have come loose or the system may not have been designed properly.

The following table from CHMC shows ratio between inflation times and airflow rates.

Time to inflate a plastic trash bag (66 cm x 91 cm [26 in. x 36 in.]


Approximate time to inflate bag

5 L/s (10 cfm)

13 seconds

10 L/s (20 cfm)

8 seconds

15 L/s (30 cfm)

5 seconds

25 L/s (50 cfm)

3 seconds

If more air is required, adjust the grille openings at the supply register in the room. Keep in mind that bedrooms require more fresh air when occupied by more than one person. http://www.oee.nrcan.gc.ca/Publications/infosource/Pub/hrv/hrvsystem.cfm?text=N&printview=N#airflow



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