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RED Calc Free Help ASHRAE 62.2 California
ASHRAE 62.2 California Tool User Guide

ASHRAE 62.2 California
Red Calc Tool User Guide

What this tool can do for you

The ASHRAE 62.2 California tool handles all the requirements of the unique version of the 62.2 Standard, including new and existing buildings, single-family and multifamily buildings, the alternative compliance path, and infiltration credit. We have added useful features, including the advanced blower door inputs option and the fan-run time option for intermittent operation of whole-building ventilation.

It is very important that this tool be used ONLY in California. This RED Calc Free tool is based on the California version of the ASHRAE 62.2-2010 Standard that was prepared with ASHRAE's permission by the California Energy Commission for the most recent update of the California Building Energy Efficiency Standards (California Code of Regulations, Title 24, Part 6).

Cover of California ASHRAE 62.2-2010
ASHRAE 62.2-2010 California

Calculated values

  • Effective annual avg. infiltration rate.
  • Whole-building Total required ventilation rate.
  • Alternative compliance supplement.
  • Infiltration credit.
  • Whole-building Required mechanical ventilation rate, Qfan.
  • Fan run-time per hour.

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.
  • For some tighter buildings, the required mechanical ventilation rate is lower if the infiltration credit is NOT used.
  • Weather data is included for 73 weather station locations California. The "Closest weather station" section of the tool is displayed only when you are using the infiltration credit feature.
  • As an aid in finding the closest weather station location, use the Weather Station Data 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 dwellings.
  • The Whole-Building Ventilation Run-Time tool allows you to determine run-time per hour if you wish to operate the whole-building fan intermittently.
  • The ASHRAE 62.2 Standard is written as a minimum standard; you may exceed the minimum requirements of the Standard.

Inputs and field measurements

  • Building type - select Single-family or Multifamily. Single-family allows you to use the infiltration credit feature; multifamily does not.
  • New or existing construction - existing construction allows Use Local Ventilation Alternative Compliance; new construction does not.
  • Use infiltration credit - you may choose to use the infiltration credit for new and existing construction, but not for multifamily dwellings. Note that for some tighter buildings, the required mechanical ventilation rate is lower if "No" is selected.
  • Floor area - from site measurement or construction drawings. Area of the livable floor space of the dwelling. Include basements only if they are characterized as living space within the pressure envelope.
  • Number of occupants - the number of bedrooms, plus one.
  • Building height - from site measurement or construction drawings. The Standard defines this as "vertical distance between the lowest and highest above-grade points within the pressure boundary, ft (m)".
  • 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 existing fan flow in kitchen and up to five bathrooms, openable windows in kitchen and up to five bathrooms. 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 at least the Required mechanical ventilation rate, Qfan.

Background

The following paragraphs are excerpted from the cover of the California version of the ASHRAE 62.2-2010 Standard.

This is a non-ASHRAE-prepared version of ANSI/ASHRAE Standard 62.2-2010, Ventilation and Acceptable Indoor Air Quality in Low-Rise Residential Buildings. This document was prepared with ASHRAE's permission by the California Energy Commission staff for the 2013 update to the California Building Energy Efficiency Standards (California Code of Regulations, Title 24, Part 6). It includes ANSI/ASHRAE Addenda to ANSI/ASHRAE Standard 62.2-2007 listed in Appendix B and ANSI/ASHRAE Addenda b, c, e, g, h, i, j, l, and n to ANSI/ASHRAE Standard 62.2-2010, as well as the errata to Standard 62.2-2010 noted in the list dated 7/21/10. It has not been through the consensus process of the American National Standards Institute and is therefore not an ANSI-approved document.

This document is not the current version of ASHRAE Standard 62.2-2010 [or 62.2-2013]. This document was the current version of ASHRAE Standard 62.2-2010 at the time the California Energy Commission adopted it for the 2013 update to the California Building Energy Efficiency Standards.

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 building 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 whole-building 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 whole-building ventilation fan airflow rate with a variable-speed control to satisfy the final whole-building airflow rate, Qfan.
  • Regarding the infiltration credit and the required blower door testing, the ASHRAE 62.2-2010 California Standard states: "Effective Annual Average Infiltration Rate (Qinf) 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.". Both ASTM E779 and CGSB 149.10 require multi-point blower door tests.

    The above statement from ASHRAE 62.2-2010 California requires a multi-point blower door test for compliance with the Standard, "unless the authority having jurisdiction [approves] another means of calculating effective leakage area (ELA). . ." 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 a single-point test is not best practice, and, unless you have approval, it is not in compliance with the Standard.
  • The ASHRAE 62.2-2010 California Standard allows the use of the alternative compliance path (Appendix A of the Standard) for existing dwellings. This path allows adjustment for deficits in local ventilation (kitchens and bathrooms) by increasing the flow rate of whole-building 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 whole-building ventilation fans.

Multifamily Dwellings

The 2010 California version of the ASHRAE 62.2 Standard includes a significant section for multifamily buildings (the Standard addresses multifamily buildings of three stories or fewer above grade). In order to use the RED Calc Free 62.2 California tool for multifamily dwelling units, select "Multifamily" as your choice for Building type in the top section of the tool.

References

  • ASHRAE. California Energy Commission Adopted Version of Standard 62.2-2010: 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 is the standard upon witch this RED Calc tool is based.
  • ASHRAE. ASHRAE Standard 62.2-2013: 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 is the official standard upon witch the RED Calc tool is based.
  • ASHRAE. 62.2 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 62.2-2010 and includes many explanations and examples for field use.
  • ASHRAE. ASHRAE Guideline 24: 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 62.2-2010 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 62.2-2013, Section 4.1.2.
  • 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 62.2-2013, Section 4.1.2.
  • 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. (2011). Mortgage industry National Home Energy Systems Standard. Residential Energy Services Network.
    Comment: This blower door testing protocol is cited in ASHRAE 62.2-2013, Section 4.1.2.
  • 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 62.2-2013 tool.
  • 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. Do not confuse this country-wide version with the specific California version of the 62.2-2010 standard.
  • 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
© 2013 Residential Energy Dynamics, LLC

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