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RED Calc Free Help ASHRAE 62.2-2016
ASHRAE 62.2-2016 Tool User Guide

ASHRAE 62.2-2016
Red Calc Tool User Guide

What this tool can do for you

The ASHRAE 62.2-2016 RED Calc tool handles all the requirements of the Standard, including new and existing buildings, the alternative compliance path, and infiltration credit. We have added useful features, including the advanced blower door inputs option, the fan-run time option for intermittent operation of dwelling-unit ventilation, and the dwelling-unit leakage rate solver.

This tool complies with all of the requirements of the ASHRAE 62.2-2016 Standard, so you can use it with confidence.

Cover ASHRAE 62.2-2016 standard.
ASHRAE 62.2-2016

Primary calculated values

  • Effective annual average infiltration rate.
  • Dwelling-unit Total required ventilation rate, Qtot.
  • Alternative compliance supplement.
  • Infiltration credit, Qinf.
  • Dwelling-Unit Required mechanical ventilation rate, Qfan.
  • Fan run-time per hour.
  • Corresponding measured leakage @ 50Pa for a chosen dwelling-unit ventilation rate.

Tips

  • Clicking the label for any input or result will cause a popup help box to appear. This help box includes the allowed and normal values (for inputs). Read more.
  • The 2016 version of the ASHRAE 62.2 Standard is the first to include dwelling units in multifamily buildings of any height. Previous versions were limited to buildings of three stories or fewer above grade. However, ASHRAE 62.2-2016 does not regulate common areas in in multifamily buildings, such as hallways, lobbies, meeting areas, etc. These areas continue to be regulated by the ASHRAE 62.1 Standard.
  • Weather data is included for the United States and Canada. The weather data for the 2016 tool includes 1100 locations in North America.
  • As an aid in finding the closest weather station location, use the Weather Station Data (TMY) RED Calc Free tool. Select the "Show map" check box to select the closest weather station on the Google map.
  • You may choose to use the Advanced Blower Door Inputs to adjust your results for temperature, altitude, and pressure exponent.
  • You may choose to use the Local Ventilation Alternative Compliance feature for existing dwellings. This feature includes one kitchen and from one to five bathrooms. This option may not be used for new buildings, based on the requirements of the 62.2-2016 Standard.
  • For new construction, the infiltration credit is limited to 2/3 of the Total required ventilation rate, Qtot. The RED Calc Free 62.2-2016 Ventilation tool automatically calculates this limit for you. The existing building infiltration credit is not limited by this 2/3 rule.
  • For new and existing, horizontally-attached single-family dwellings, an infiltration credit is available based on the ratio of the exterior envelope surface area to total envelope surface area. When you select the appropriate dropdown items in the RED tool and enter the corresponding values, this infiltration credit, based on a blower door test, is calculated for you.
  • For multifamily dwellings, refer to the "Multifamily Dwellings" section below.
  • The Dwelling-Unit Ventilation Run-Time Solver allows you to determine run-time per hour if you wish to operate the dwelling-unit fan intermittently.
  • The Dwelling-Unit Leakage Rate Solver allows you to determine the meaaured leakage rate at 50 pascals that corresponds to a chosen dwelling-unit mechanical ventilation rate.
  • The ASHRAE 62.2 Standard is written as a minimum standard; you may exceed the minimum requirements of the Standard.

Inputs and field measurements

  • Foor area - from site measurement or construction drawings. This area is defined as all enclosed above- and below-grade finished areas suitable for year-round use. Include basements, or parts thereof, only if they are finished in a manner similar to the rest of the dwelling.
  • Number of occupants - the number of bedrooms, plus one. For variation, see ASHRAE 62.2-2016, Section 4.1.3.
  • Dwelling height - from site measurement or construction drawings. The Standard defines this as the "vertical distance between the lowest and highest above-grade points within the [dwelling] pressure boundary".
  • Wall surface areas (just below "Dwelling height") - optional; these inputs will appear only if in the top section of the tool you select 1) "Attached to other dwelling unit(s)" in the "Dwelling unit is" dropdown, 2) "Yes" for "Only walls are in common with other dwelling units", and 3) "Yes" for "Use infiltration credit". These choices signify horizontally-attached dwelling units in a multifamily building. Examples of multifamily buildings that include horizontally-attached single-family dwellings include side-by-side duplexes, triplexes, and row houses. For this selection, these input boxes will appear just below "Dwelling height": "Area of common walls", "Envelope area of adjoining garage", and "Remaining envelope area".
  • Measured leakage - from single-point or multi-point blower door test.
  • Advanced blower door inputs - optional; indoor temperature, outdoor temperature, altitude, and pressure exponent.
  • Local ventilation alternative compliance - optional; measured fan flow in kitchen and up to five bathrooms for the fans that will be in place when the job is completed. Also must enter whether kitchen or bathroom has an openable window. May be used for existing dwellings only.
  • Fan capacity - optional; the capacity of the fan you will install (or the fan that is already installed) that you will automatically control to operate intermittently. This value must be larger than the Required mechanical ventilation rate, Qfan.
  • Target mechanical ventilation rate - optional; a dwelling-unit mechanical ventilation rate for which you want to determine the corresponding Measured leakage rate at @ 50Pa.

Background

Although the first version of the ASHRAE Standard 62.2, Ventilation and Acceptable Indoor Air Quality in Low-Rise Residential Buildings, was published in 2003; the 2010 version was the first to gain national attention.

The Wisconsin low-income weatherization program was the first organization to adopt the residential ventilation/IAQ standard, in late 2004. The adoption of the ventilation/IAQ standard gained momentum in 2011 when the Department of Energy required the use of ASHRAE 62.2-2010 in the low-income weatherization program by the end of the 2012 program year. In 2013 the Building Performance Institute (BPI) adopted the 2013 version of the standard.

The 2016 version of the 62.2 Standard includes a significant change in scope: Rather than addressing single-family and multifamily buildings of three stories and less above grade (low-rise), as the previous versions did, it addresses dwellings in buildings of any height, including high-rise multifamily buildings.

Best practices

  • In order to use the infiltration credit for a new dwelling, you must conduct a blower door test. The appropriate sequence to use for a new dwelling is as follows: First, you must estimate what you think the blower door test value will be when the dwelling is completed. Second, install a dwelling-unit fan with a capacity that exceeds your estimate for the final airflow rate. Third, conduct the blower door test when the dwelling is finished. Finally, adjust the dwelling-unit ventilation fan airflow rate with a variable-speed control to satisfy the actual dwelling-unit airflow rate, Qfan. Or, if you are using intermittent operation of the dwelling-unit ventilation fan, adjust the run time of the fan to correspond with the "Required mechanical ventilation rate, Qfan.

  • Regarding the infiltration credit and the required blower door testing, ASHRAE 62.2-2016 Standard states: "Effective Annual Average Infiltration Rate" shall be calculated using the normalized leakage calculated from measurements of envelope leakage using either ASTM E779 or CGSB 149.10. The authority having jurisdiction may approve other means of calculating effective leakage area (ELA), such as the RESNET Mortgage industry National Home Energy Systems Standard." (ASHRAE 62.2-2016, Section 4.1.2). Both ASTM E779 and CGSB 149.10 require multi-point blower door tests.

    In other words, when using the infiltration credit, you are not in compliance with the Standard unless you do a multi-point blower door test, unless your "authority having jurisdiction" allows you to use a single-point test. So, keep in mind that unless you have approval, a single-point blower door text is not in compliance with the Standard.

  • The ASHRAE 62.2-2016 Standard allows the use of the alternative compliance path (Appendix A of the Standard) for existing dwellings. This path allows compensation for deficits in local ventilation (kitchens and bathrooms) by increasing the flow rate of dwelling-unit ventilation. Generally, use of this alternative path saves installation time and money, but it might result in lower indoor air quality. Whenever possible, avoid the use of the alternative compliance path and install separate local and dwelling-unit ventilation fans.

Multifamily dwellings

The 2016 version of the ASHRAE 62.2 Standard includes dwellings in multifamily buildings of any height, including more than three stories above grade. Previous versions only included dwellings in multifamily buildings of three stories or fewer above grade. In order to use the RED Calc Free 62.2-2016 tool for dwelling units in multifamily buildings, select "Attached to other dwelling unit(s)" in the "Dwelling unit is" dropdown.

Note: The only infiltration credit allowed for dwellings in multifamily buldings by the 2016 version of the 62.2 Standard is for horizontally-attached single-family units, such as side-by-side duplexes, triplexes, and row houses. Dwellings units that are attached to other dwelling units in any way other than via side walls are not allowed a infiltration credit.

References

  • ASHRAE. ASHRAE Standard 62.2-2016: Ventilation and Acceptable Indoor Air Quality in Residential Buildings. Atlanta, GA: American Society of Heating, Refrigerating and Air-Conditioning Engineers, Inc. This document may be purchased at www.ashrae.org.
    Comment: This is the official standard upon witch the RED Calc tool is based.
  • ASHRAE. 62.2-2016 User's Manual. Atlanta, GA: American Society of Heating, Refrigerating and Air-Conditioning Engineers, Inc. This document may be purchased at www.ashrae.org.
    Comment: This document is based on ASHRAE 62.2-2016 and includes many explanations and examples for field use.
  • ASHRAE. ASHRAE Guideline 24-2015: Ventilation and Acceptable Indoor Air Quality in Low-Rise Residential Buildings. Atlanta, GA: American Society of Heating, Refrigerating and Air-Conditioning Engineers, Inc. This document may be purchased at www.ashrae.org.
    Comment: This document is loosely based on ASHRAE 62.2-2013 and includes commentary and guidance on achieving acceptable indoor air quality in low-rise residential buildings.
  • ANSI/ASTM E799-10. Standard Test Method for Determining Air Leakage Rate by Fan Pressurization. ASTM International, West Conshohocken, PA.
    Comment: This blower door testing protocol is cited in ASHRAE 62.2-2016.
  • CAN/CGSB 149.10-M86. Determination for the Airtightness of Building Envelopes by the Fan Depressurization Method. Canadian General Standard Board, Gatineau, Quebec, Canada.
    Comment: This blower door testing protocol is cited in ASHRAE 62.2-2016.
  • Raymer, Paul H. Residential Ventilation Handbook: Ventilation to Improve Indoor Air Quality. New York: McGraw Hill, 2010
    Comment: This is a very usable resource for the understanding and installation of residential ventilation. Includes many good illustrations, tables, and charts.
  • RESNET. (2013). Mortgage industry National Home Energy Systems Standard. Residential Energy Services Network.
    Comment: This blower door testing protocol is cited in ASHRAE 62.2-2016.
  • Sherman, M.H. (2004). ASHRAE's First Residential Ventilation Standard. Lawrence Berkeley National Laboratory, Berkeley, CA. LBNL-42975R3.
    Comment: This is the best background resource for the ASHRAE 62.2 residential ventilation standard.
  • Walker, Iain and Max Sherman. (2008). Energy Implications of Meeting ASHRAE Standard 62.2. ASHRAE Transactions, Vol. 114, Part 2.
    Comment: Good resource for the implications of energy use when complying with the ASHRAE 62.2 Standard.

Related tools

  • Weather Station Data (TMY): The embedded Google map feature helps you find the closest (TMY) weather station when your location is close to a state/province or national border and the closest station is actually in a different state/province/country. Additionally, the tool's interactive table and chart help you explore the the Typical Meteorological Year (TMY) data for each of 1,100 weather stations in North America. This is the same data used by the ASHRAE 62.2-2016 tool.
  • ASHRAE 62.2-2013 Ventilation: Determine whole-building ventilation requirements for new and existing dwellings, with the choice of using advanced blower door options and the alternative compliance path.
  • ASHRAE 62.2-2010 Ventilation: Determine whole-building ventilation requirements for new and existing dwellings, with the choice of using advanced blower door options and the alternative compliance path.
  • Ventilation Electrical Usage: Determine the annual electrical cost of operating a ventilation fan that is set up for continuous or intermittent use.
  • Depressurization Analysis: With this "solve-all" tool you can calculate house pressure, CFM50 tightness limit (Depressurization Tightness Limit), or total exhaust fan flow.
  • Pitot Tube Airflow: With this tool, a pitot tube, and a digital manometer, you can determine the airflow of a ducted range hood, a clothes dryer, or other appliance will an accessible duct.
  • Box Airflow: Determine the flow of an exhaust fan with this tool, a cardboard box, and your digital manometer.

Version 2016-07-06_01:30
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