Friday, May 1, 2020

ASHRAE - Whole Building Ventilation Calculations

About this sheet 

  • This sheet is designed to determine the volume of airflow required to meet the ASHRAE 62.2-2013 whole building ventilation requirement. 
  • There is a tab at the bottom of the page that links to a report sheet that can be completed and signed to document the system.
  • The "Exist.Adjusted whole building CFM cells displays the ventilation requirements for existing buildings adjusted for existing fans, windows and infiltration credit.
  • It displays required ventilation when the building is tightened , calculates theACH50,ACHnatural,calculates the 'N' factor and the target CFM50 for .35 ACH Natural 
  • Note that the 'N'factors are based on ASHRAE'S TYM 3 weather data, and the number of stories of the building.
  • If Macros are active, select "Clear Entries " to clear all the entry fields.

How to Use this Sheet ?

  • Select the State or Province.
  • Select a Weather Station.
  • Enter the Square footage of the House.
  • Enter the number of bedrooms or number occupants-1 ,whichever is more.
  • Select the  number of floors.
  • Enter the blower door CFM50 on single family units .(No entry for multi family units )

Existing Building Adjustment :-
Note :- Calculation assumes that if there is no entry for a window or fan in the kitchen, the existing building calculations are not being used.

  • The "Finish" column allows you to adjust the fan sizes to achieve a '0' CFM deficit.
  • Select "Yes" or "No" for window in the Kitchen.
  • Enter the measured fan CFM in the Kitchen.
  • Select "Yes" or "No" for window in the bathroom.
  • Enter the measured fan CFM in the bathroom e.t.c.

Note that for intermittent control, click the intermittent control tab.
Click on the report control tab for a printable report version of the data.
All information with PINK fill is generated automatically.

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