Appendix B
2000 IECC
This appendix describes features that have been changed in COMcheck to support the 2000
International Energy Conservation Code (IECC). The 2000 IECC version is very similar to the 90.1-1989 Code version. Areas not addressed in this appendix are the same as in the 90.1-1989 Code version of COMcheck. Major differences occur in only one area – lighting system requirements.
B.1 Building Use Types
The 2000 IECC uses the same whole building types and area categories as the 90.1-1989 Code and the 1998 IECC, except five new building use types were added to the 2000 IECC and the 90.1-1989 Code, but not the 1998 IECC. The new building use types were not added to the 1998 IECC version of COMcheck to keep it fully consistent with the 1998 IECC as published (see Section 2.2 of this document,
for a list of these new building use types). Roughly 60% of the existing building use types have different lighting power densities, reflecting the 2000 IECC changes. The densities have decreased for some building use types and increased for others. Overall they appear to represent a modest increase in stringency. The 2000 IECC version of COMcheck uses the building use types and their corresponding
lighting power densities exactly as listed in Table 805.4.2 of the 2000 IECC. Tables B.1 and B.2 list the lighting power density requirements for whole building types and area categories, respectively.
The 2000 IECC changes were based on what were proposed revisions to Standard 90.1-1989 at the time the IECC code changes were accepted. The changes were proposed by Jeff Johnson with the New Buildings Institute (NBI), and NBI prepared the technical justification for those changes.
Table B.1. Whole Building Type Lighting Power Density (LPD) Requirements
Whole Building Type LPD (W/ft2)
Exercise Center 1.4
Grocery Store 1.9
Library 1.5
Medical and Clinical Care 1.6
Museum 1.6
Office 1.3
Religious Worship 2.2
Restaurant 1.7
Retail Sales, Wholesale Showroom 1.9
School 1.5
Storage, Industrial and Commercial 0.6 Theater-Motion Picture 1.1
Theater-Performance 1.4
Table B.2. Area Category Lighting Power Density (LPD) Requirements
Area Category LPD (W/ft2)
Auditorium 1.6
Bank/Financial Institution 2.0
Classroom/Lecture Hall 1.6
Convention, Conference or Meeting Center 1.5 Corridor, Restroom, Support Area 0.8
Dining 1.4
Exercise Center 1.1
Exhibition Hall 3.3
Grocery Store 2.1
Gymnasium Playing Surface 1.9
Hotel Function 2.4
Industrial Work, < 20 ft Ceiling Height 2.1 Industrial Work, >= 20 ft Ceiling Height 3.0
Kitchen 2.2
Library 1.8
Lobby-Hotel 1.9
Lobby-Other 1.0
Mall, Arcade, or Atrium 1.4 Medical and Clinical Care 1.6
Museum 1.6
Office 1.5
Religious Worship 3.2
Restaurant 1.7
Retail Sales, Wholesale Showroom 2.1 Storage, Industrial and Commercial 1.0 Theaters-Motion Picture 1.0
Theaters-Performance 1.5
Other 1.0
The internal load values used in calculating envelope compliance are based in part on lighting power budgets. The internal loads in the 2000 IECC version of COMcheck were adjusted to reflect the revised
lighting power densities described above. The methods and assumptions used in determining the internal load values were identical to those used in developing the values for the 90.1-1989 Code, except that the values in Table 805.4.2 of the 2000 IECC were substituted for the 90.1-1989 Code values.
B.2 Envelope
B.2.1
Vapor Retarders
The vapor retarder requirement in the 2000 IECC is the same as discussed in A.2.1 for the 1998 IECC.
B.3 Lighting
B.3.1
Exemptions and Allowances
Each code version has exemptions for specific space uses, lighting applications, and/or equipment. Codes using exemptions and allowances based on Standard 90.1-1999 (i.e., 2000 IECC and the
Massachusetts Code) also have power allowances. COMcheck allows exemptions or power allowances
for qualifying fixtures.
B.3.2
Exemptions
The following exemptions based on Section 805.4.1 of the 2000 IECC are available in the 2000 IECC version of COMcheck:
• Special Medical/Dental/Research • Professional Sports Arena Playing Field • Gallery/Museum/Monument Exhibits • Lighting in Residential Dwelling Units • Emergency Lighting (Automatic Control).
B.3.3
Allowances
Additional lighting power allowances can be claimed under certain conditions resulting in the lighting power budget being increased, but only within limits and only to the extent the additional power is used for the qualifying application. Allowances in the 2000 IECC version of COMcheck are available with
both the whole building type and area category methods. This differs from Standard 90.1-1999 and the Massachusetts commercial code, in which allowances are only available under the area category method.
When a fixture is identified as qualifying for an allowance, the user must provide the floor area qualifying for the allowance, the whole building type or area category corresponding with that floor or display area, and the type of allowance. The lighting power budget is increased by the product of the affected area and the wattage per square foot claimed up to the permitted maximum allowance, but not more than the total wattage of the selected fixtures.
COMcheck does not require space-by-space input of lighting fixtures. Without a space-by-space
mapping of lighting fixtures to spaces, it is not possible to ensure that a space fully utilizes its lighting power budget before claiming the exemption or allowance. As a result, any unused budget for a space becomes usable elsewhere in the building, if the exemption or allowance is claimed. This was deemed to be a minor compromise relative to the large advantage of not requiring users to enter every fixture in the
building on a space-by-space basis. In addition, both Massachusetts code and Standard 90.1-1989R language do not explicitly require the rigorous interpretation of these provisions.
Allowances can be obtained for any fixture by specifying the allowance type and its floor area. The budget lighting power is adjusted as below:
i i
i
i space allowance allowance space
required Area LPD Area LPD
LPD =
∑
× +∑
× (B.1)where space i = area category types specified for the building LPD = lighting power density
allowance i = allowance claimed for allowance types specified for fixtures.
The allowances in Table B.3 are available in the 2000 IECC version of COMcheck and are based on
the footnotes to Table 805.4.2 Interior Lighting Power in the 2000 IECC. The whole building types and
area categories qualifying for these allowances are also listed.
Table B.3. Whole Building Types and Area Categories Qualifying for Allowances
Allowance Type Amount (W/ftAllowance 2) Whole Building Type/Area Category Decorative 1.0 Bank/Financial Institution
Convention, Conference or Meeting Center Dining Exercise Center Hotel Function Library Lobby - Hotel Lobby - Other Religious Worship Restaurant Theaters - Performance Visual Display Terminals 0.35 Classroom/Lecture Hall
Medical and Clinical Care Museum
Office Merchandise Display 1.6 Grocery Store
Retail Sales, Wholesale Showroom Fine Merchandise Display 3.9 Retail Sales, Wholesale Showroom Emergency Medical/Pharmacy 1.0 Medical and Clinical Care
B.4 Mechanical
B.4.1
Economizer Requirements
In the 2000 IECC, buildings in Climate Zone 3c are not exempted from the economizer requirements. The integrated economizer requirement was included in the 2000 IECC, so COMcheck-EZ Version 2.0
and the 2000 IECC were already consistent; however, the Climate Zone 3c economizer requirement was included for the 2000 IECC version of COMcheck. All other requirements are identical to the 90.1-1989