# Presentation: 302500

## ASHRAE/IESNA STANDARD 90.1 ENERGY STANDARD FOR BUILDINGSEXCEPT LOW-RISE RESIDENTIAL BUILDINGS

**Bruce D. Hunn**
**Director or Technology**
**ASHRAE**
**2001 National Workshop on **
**State Energy Codes **
**Burlington, VT   July 17, 2001**

## DEVELOPMENT OF STANDARD 90.1

**Promulgating organizations****:** *- ASHRAE (American Society of Heating, Refrigerating, and **	**	**Air-Conditioning Engineers)* *- IESNA (Illuminating Engr Society of North America)*
**Background****:***  **- Standard 90 has been basis for energy codes since it **	**	**was first published in 1975**- Previous standard version adopted in 1989; Codified **	**version in 1993*
- 	- *Current version published in 1999*
**ASHRAE/IESNA Standard 90.1-2001 – *****Fall 2001***

## CODE COMPLIANCE ISSUES FOR APPLICANTS AND CODE OFFICIALS

**Applicants who don't know the code and simply want a permit, or those who design beyond code but want easy compliance:**- *provides prescriptive option with minimal calculations*
**Applicants who want flexibility:**- *provides multiple compliance options (ENVSTD, lighting      **	**wattage)*
**Need for  consistent information sources:**- *NFRC ratings for fenestration (windows, skylights, doors)**- tables of pre-calculated U-factors for opaque assemblies*

## FEATURES OF STANDARD 90.1-1999

**Written in mandatory, code-enforceable language throughout:** - *minimum requirements*
**Organized by design discipline** (building envelope, HVAC, and lighting):- *corresponds with stages of the permitting process**	**(building permit, mechanical permit, electrical permit)*
**Criteria based on common construction***- typical opaque assemblies with thermal bridges for the **	**building envelope, actual projects for lighting*

## BUILDING ENVELOPE FEATURES

**All requirements for climate location in one-page table**
**Prescriptive compliance option **- *can specify R-value of insulation and **	**NFRC U-factor and SHGC ratings for fenestration, **	**no calculations required except for fenestration area, OR**- can look up tabulated U-factors for 2500 common roof, wall, and **	**floor assemblies *
**ENVSTD trade-off option **- *includes all components of building envelope**- drop-down menus contain all default assemblies**- output provides detailed listing of assemblies and **	**	**	**corresponding areas to facilitate comparison with plans*

## HVAC & LIGHTING FEATURES

**HVAC (heating, ventilating, & air-conditioning)****- ***simple systems compliance option**	**(applies to packaged equipment in low-rise buildings)*
**Lighting***- building area compliance option for lighting wattage**	**(such as office, retail)*- s*pace-by-space compliance option for lighting wattage**	**(such as emergency room, pharmacy, nurse’s station, etc.)**- lighting control requirements simplified**	*

## ADMINISTRATIVE FEATURES

**Clarifies application to existing buildings, additions, alterations, and change of use***- additions treated same as new construction**- altered portions only to comply (subject to limitations)**- change from unheated space to heated space to comply*
**Documentation and labeling simplify plan review and inspection***- compliance documents to contain all necessary information**- insulation to be labeled with R-value, fenestration labeled with **	**U-factor and SHGC, mechanical equipment identified**	*

## ADDENDA APPROVED FOR2001 VERSION

***34 Total Addenda***
***16 involve substantive changes***
***Changes to criteria***
***Changes to exceptions***
***Increased flexibility of requirements***
***18 involve clarifications or editorial changes***
***HVAC=11, Envelope=9, Lighting=7, Admin/Enforce.=2, ECB=2, SWH=1, Power=1, Definitions=1 ***

## RESOURCES FOR IMPLEMENTATION

***Users Manual includes examples and sample compliance forms***
***Users Manual includes ENVSTD software for Windows***
***Professional Development Seminar – “Complying with Standard 90.1” scheduled for January 2002 at ASHRAE Winter Meeting, Atlantic City, NJ***

## RESOURCES FOR IMPLEMENTATION (Cont.)

***Continuous Maintenance***
**Proposed addenda may be submitted at any time **
**SSPC must take documented, consensus action within one year, and must notify proposer of action**
***Interpretation requests handled by 90.1 Committee***
**Informal (unofficial): Chair or staff respond **
**Formal (official): SSPC approves response***** ***

## CODE INTERACTION SUBCOMMITTEE OBJECTIVES

***Work closely with model code organizations to incorporate features of 90.1 and 90.2***
**Adoption by reference**
**By insertion of key 90.1 and 90.2 elements, as appropriate**
***Synchronize with model code cycles***
**Republish standards on 3-year cycle coordinated with model code organizations**

## CONCLUSIONS

***ASHRAE provides a forum in which complicated technical issues can be resolved and consensus achieved***
***Subject to negotiation and compromise***
***Process has been streamlined to be more responsive and timely***
***continuous maintenance***
***procedures overhaul***
***All are invited to participate***