QC Tools Make Capturing and Calculating Audit Data a Breeze
When it comes to creating precise energy models nothing beats obtaining fast, accurate and repeatable results. That's why the Program created and made available to contractors an Excel document titled "QC Tools." The document was created for use during an audit (either test-in or test-out) and gives the auditor the ability to record project information.
The QC Tools has many built-in functions and formulas that make quick work out of complex calculations. The document is comprised of the following seven tabs, each with its own purpose:
- Combustion Safety
- Duct Leakage Calculator
- Air Leakage and MV Calculator
- Intermittent MV Hours-Per-Day
- Intermittent MV Minutes-Per-Hour
Once back at the office, the values from the QC Tools can be quickly and easily plugged into the energy-modeling software of your choice. For contractors not using energy-modeling software, the QC Tools is an indispensable tool to help you get the most for your customer.
The Introduction Tab
gives a detailed description of each of the other six tabs, specific examples of their use, and informs the reader if that tab is required by the Program to be completed.
The Combustion Safety Tab
is the form used by the RHA's Energy Field Technicians. Use it to document CAS/CAZ details for attended and un-attended appliances. Color-coding red and green results easily identify pass and fail criteria. A simple click of a button resets the form allowing it to be used repeatedly.
The Dimensions Tab
lets you easily calculate conditioned floor area, volume, average ceiling height, wall and window area by orientation, and window area as a percentage of wall area. These calculations are performed by entering a minimal number of dimensions.
Duct Leakage Calculator Tab:
By entering just three values, the duct leakage calculator calculates system airflow, duct leakage percentage, and whether the system meets the 10% maximum leakage requirement. This tab can calculate two separate duct systems at once and calculates system airflow based on cooling tonnage or heating output, whichever is greater.
Air Leakage and MV Calculator Tab: There are two calculations that take place on this form. First, values are entered in the white cells on step 1 to determine if mechanical ventilation is required, recommended, or is not an issue. If mechanical ventilation is required or recommended in step 1, enter values in the white cells in step 2. The calculator will determine the amount of minimum continuous mechanical ventilation airflow required or recommended.
Intermittent MV Hours-Per-Day Tab:
If mechanical ventilation is required, you can set up the MV fan to run for a specific number of hours per day as opposed to running 24/7. By using the MV airflow required and entering the desired number of hours of operation, one can easily determine the correct fan airflow for intermittent use.
Intermittent Minutes-Per-Hr. Tab: Just as with the Hours-Per-Day above, you can set up the MV fan to run for a specific number of minutes per hour as opposed to running continuously every hour. By using the MV airflow required and entering the desired number of minutes per hour of operation, one can easily determine the correct fan airflow for intermittent use.