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Download Excel Calculator For HVAC Duct Leakage Test




Instructions :
  • %Duct Leakages To Outdoors : Enter the estimated percentage of the total Duct Leakage that leads to outdoors in order to estimate cost of duct leakage.(Input is only required when performing a total duct leakage test).
  • 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 included in the cooling bill.
  • 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.
  • 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 as accurate.
  • Leakage Split : Enter the estimated fraction of the Total Duct Leakage that is on the Supply Side and the return side.Their default values are 0.5, meaning the leakage the HVAC system is split evenly between the supply and return.The Leakage split for the supply side and the return side always add up to 1.0.
  • Supply Leakage Penalty : This is the estimated fraction of energy loss of the supply side.The default valves is 1.0.This means that of the supply air leakage, all of its energy is lost to the outdoor (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 loss will be regained back into the house, so a lower leakage penalty would provide a better estimate of annual HVAC losses.
  • 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 is regained back into 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 greater effect on the annual HVAC losses.

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