Annual cooling cost, Annual heating cost, Average duct operating pressure – Retrotec DucTester 341 User Manual
Page 52: Leakage split, Supply leakage penalty, Return leakage penalty, Save the duct leakage test report as a pdf file, With office 2007, With office 2010, 9 save the duct leakage test report as a pdf file
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10.8.2.
Annual Cooling Cost
Enter the cooling cost per year from the utility bill. This entry is used to estimate the cost of Duct
Leakage to Outdoors that is included in the cooling bill.
10.8.3.
Annual Heating Cost
Enter heating cost per year from the utility bill. This entry is used to estimate the cost of Duct Leakage
to Outdoors included in the heating bill.
10.8.4.
Average Duct Operating Pressure
Measure the pressure in the supply duct closest to the plenum and enter that pressure to get an
accurate calculation of duct losses. Do the same for the return. Using the test pressure (default value)
here will not be accurate.
10.8.5.
Leakage Split
Enter the estimated fraction of the Total Duct Leakage that is on the supply side and the return side.
The default values are 0.5, meaning the leakage of the HVAC system is split evenly between the supply
and return. Adding the Leakage Split for the supply side and the return side together should always
come out to 1.0.
10.8.6.
Supply Leakage Penalty
This is the estimated fraction of energy loss of the supply side. The default value is 1.0. This means that
of the supply air leakage, all of its energy is lost to the outdoors (i.e., none of its energy is returned back
into the house). This number can be lowered if some of the energy from duct leakage leads back into
the house. For example, if supply leaks are going into a wall cavity, some of the energy will be go back
into the house, so a lower leakage penalty would provide a better estimate of annual HVAC losses.
10.8.7.
Return Leakage Penalty
This is the estimated fraction of energy loss of the return side. The default value is 0.5, which assumes
that of the return air leakage, about half of its energy is lost to outdoors (i.e., the other half of its energy
stays inside the house). This number can be raised if you suspect that there is actually more energy loss
to the outdoors from the return side. For example, if the return goes through a very cold crawl space,
the return leakage would pull in cold air and have a greater effect on the annual HVAC losses.
10.9
Save the Duct Leakage Test Report as a PDF file
10.9.1.
With Office 2007:
Click the MS Office icon at the top left corner of the window:
Mouseover “Save As” on the menu Click “PDF or XPS”
Select the directory to save the PDF file to Enter a proper file name for the PDF file to as
Click “Publish”
10.9.2.
With Office 2010
Click "File" "Save As" Change the "Save as type" to "PDF "
Select the directory to save the PDF file to Enter a proper file name for the PDF file to as Click "Save"