ASHRAE 90.1-2007

1. ASHRAE 90.1-2007 Session #8 � Building Area Method Overview The Building Area Method Special Situations Welcome to Session #8 on the ASHRAE 90.1-2007 energy code. This session will cover: an overview of the interior lighting power allowance in general and how to determine that allowance using the building area method. We will also look at how to apply this method to certain building types. Welcome to Session #8 on the ASHRAE 90.1-2007 energy code. This session will cover: an overview of the interior lighting power allowance in general and how to determine that allowance using the building area method. We will also look at how to apply this method to certain building types.

2. Codes & Standards Training Series 2 �9.2.2.3 Interior Lighting Power Allowance The interior lighting power allowance for a building or a separately metered or permitted portion of a building shall be determined by either: the Building Area Method described in Section 9.5 or the Space-by-Space Method described in Section 9.6. The prescriptive lighting requirements limit the installed electric wattage for interior building lighting. Either the Building Area Method described in this session or the Space-by-Space Method described in a later session may be used. Please note that while the Building Area Method is sometimes referred to as the whole building method, it may be used for portions of a building. The prescriptive lighting requirements limit the installed electric wattage for interior building lighting. Either the Building Area Method described in this session or the Space-by-Space Method described in a later session may be used. Please note that while the Building Area Method is sometimes referred to as the whole building method, it may be used for portions of a building.

3. Codes & Standards Training Series 3 �9.2.2.3 Interior Lighting Power Allowance The interior lighting power allowance for a building or a separately metered or permitted portion of a building shall be determined by either: the Building Area Method described in Section 9.5 or the Space-by- Space Method described in Section 9.6. The installed interior lighting power identified in accordance with Section 9.1.3 shall not exceed the interior lighting power allowance developed in accordance with Section 9.5 or 9.6 The installed interior lighting power we calculated in an earlier session must be less than or equal to the interior lighting power allowance we will calculate here. The installed interior lighting power we calculated in an earlier session must be less than or equal to the interior lighting power allowance we will calculate here.

4. Codes & Standards Training Series 4 �9.2.2.3 Interior Lighting Power Allowance The interior lighting power allowance for a building or a separately metered or permitted portion of a building shall be determined by either: the Building Area Method described in Section 9.5 or the Space-by- Space Method described in Section 9.6. The installed interior lighting power identified in accordance with Section 9.1.3 shall not exceed the interior lighting power allowance developed in accordance with Section 9.5 or 9.6 Trade-offs of interior lighting power allowance among portions of the building for which a different method of calculation has been used are not permitted. The user is allowed to use the Building Area Method in one area of the building and use Space-by-Space in the other. However wattage trade-offs, between those areas using different methods of calculation, are then prohibited. The user is allowed to use the Building Area Method in one area of the building and use Space-by-Space in the other. However wattage trade-offs, between those areas using different methods of calculation, are then prohibited.

5. Codes & Standards Training Series 5 �9.5 Building Area Method Where, ILPA = Interior Lighting Power Allowance LPD = Lighting Power Density for that area GLA = Gross Lighted Area of that area The building area method is the easiest way of determining the lighting power allowance simply because it involves fewer computations. The building area method assigns a single interior lighting power density to the entire area based on the building type. The lighting power density is then multiplied by the gross lighted area of the building to determine the interior lighting power allowance (ILPA). The building area method is the easiest way of determining the lighting power allowance simply because it involves fewer computations. The building area method assigns a single interior lighting power density to the entire area based on the building type. The lighting power density is then multiplied by the gross lighted area of the building to determine the interior lighting power allowance (ILPA).

6. Codes & Standards Training Series 6 Gross Lighted Area Includes: basements, mezzanines and intermediate-floor tiers, and penthouses, provided these spaces have a headroom height of 7.5 ft (2.3 m) or greater The gross lighted area is measured: from the exterior faces of exterior walls and from the centerline of walls separating buildings. Excludes: covered walkways, open roofed-over areas, porches and similar spaces, pipe trenches, exterior terraces or steps, chimneys, roof overhangs, and similar features The gross lighted area is used in the building area method of determining interior lighting power allowance. The gross lighted area of the building is the gross floor area of lighted spaces in the building. It includes basements, mezzanines and intermediate-floor tiers, and penthouses, provided these spaces have a headroom height of at least 7.5 ft. The gross lighted area is measured from the exterior faces of exterior walls and from the centerline of walls separating buildings. The gross lighted area excludes covered walkways, open roofed-over areas, porches and similar spaces, pipe trenches, exterior terraces or steps, chimneys, roof overhangs, and similar features.The gross lighted area is used in the building area method of determining interior lighting power allowance. The gross lighted area of the building is the gross floor area of lighted spaces in the building. It includes basements, mezzanines and intermediate-floor tiers, and penthouses, provided these spaces have a headroom height of at least 7.5 ft. The gross lighted area is measured from the exterior faces of exterior walls and from the centerline of walls separating buildings. The gross lighted area excludes covered walkways, open roofed-over areas, porches and similar spaces, pipe trenches, exterior terraces or steps, chimneys, roof overhangs, and similar features.

7. Codes & Standards Training Series 7 LPD-Lighting Power Density Let�s look at how to select the correct LPD or Lighting Power Density. Here we see the building types available in the Building Area Method and their LPD allowances. E.g.[C1] a school or university building would be allowed 1.2 watts per sq.ft while [C2] a Religious Building would be allowed 1.3 watts per sq.ft. Please note that when both a general building type and a more specific building type applies, the more specific building type shall be used. So for a religious building on a school campus, the religious building LPD would be used. Now, let�s look at a few individual buildings types.Let�s look at how to select the correct LPD or Lighting Power Density. Here we see the building types available in the Building Area Method and their LPD allowances. E.g.[C1] a school or university building would be allowed 1.2 watts per sq.ft while [C2] a Religious Building would be allowed 1.3 watts per sq.ft. Please note that when both a general building type and a more specific building type applies, the more specific building type shall be used. So for a religious building on a school campus, the religious building LPD would be used. Now, let�s look at a few individual buildings types.

8. Codes & Standards Training Series 8 Dining Family Dining: Table service, menus, etc. Cafeteria No table service; patrons order and pick up their food from a counter and then go to a table Fast Food Like a cafeteria but food may be picked up at a drive-up window Bar Lounge Typically a limited food menu. Entertainment typically available. Leisure: Like Family Dining but geared more for adults and a more relaxed pace When the building type for dining is not clear, the authority having jurisdiction will decide. There are five Building Area types labeled dining: Family Dining, Cafeteria, Fast Food, Bar Lounge and Leisure (two pairs of these types have been grouped in the standard based on allowed LPD). Much of the time, the distinction will be clear. When the building type for dining is not clear, the authority having jurisdiction will decide. The designer may use the following descriptions as guidelines: ? Family Dining is characterized by table service, menus and other amenities associated with full-service restaurants. ? Cafeteria dining has no table service; patrons order and pick up their food from a counter and then go to a table. ? Fast Food dining has no table service; patrons order and pick up their food from a counter and then go to a table or they pick up their food at a drive-up window. ? Bar Lounge dining frequently has a limited food menu. The atmosphere is typically more social. Often pool tables, game machines, TV monitors, a stage or other means of entertainment is offered. ? Leisure dining, like Family Dining, is characterized by table service, menus and other amenities associated with full-service restaurants but is typically geared towards adults and a more relaxed pace.There are five Building Area types labeled dining: Family Dining, Cafeteria, Fast Food, Bar Lounge and Leisure (two pairs of these types have been grouped in the standard based on allowed LPD). Much of the time, the distinction will be clear. When the building type for dining is not clear, the authority having jurisdiction will decide. The designer may use the following descriptions as guidelines: ? Family Dining is characterized by table service, menus and other amenities associated with full-service restaurants. ? Cafeteria dining has no table service; patrons order and pick up their food from a counter and then go to a table. ? Fast Food dining has no table service; patrons order and pick up their food from a counter and then go to a table or they pick up their food at a drive-up window. ? Bar Lounge dining frequently has a limited food menu. The atmosphere is typically more social. Often pool tables, game machines, TV monitors, a stage or other means of entertainment is offered. ? Leisure dining, like Family Dining, is characterized by table service, menus and other amenities associated with full-service restaurants but is typically geared towards adults and a more relaxed pace.

9. Codes & Standards Training Series 9 Religious Building Applies to a religious building with a sanctuary Includes offices, meeting rooms, and other support facilities within the building This building type applies to a religious building with a sanctuary. It also includes the offices, meeting rooms, and other support facilities within the building. If other buildings exist on the site, such as schools, libraries, or administration buildings, these should be considered as separate building types.This building type applies to a religious building with a sanctuary. It also includes the offices, meeting rooms, and other support facilities within the building. If other buildings exist on the site, such as schools, libraries, or administration buildings, these should be considered as separate building types.

10. Codes & Standards Training Series 10 Gymnasiums and Exercise Centers Exercise center: Exercise machines and workout areas Gymnasium: A larger space with a high ceiling suitable for basketball or other team sports An exercise center is characterized by exercise machines and workout areas, while a gymnasium is a larger space with a high ceiling suitable for basketball or other team sports.An exercise center is characterized by exercise machines and workout areas, while a gymnasium is a larger space with a high ceiling suitable for basketball or other team sports.

11. Codes & Standards Training Series 11 Office Applies to administration buildings, multi-tenant offices, and other similar facilities Should only be used for buildings where offices are the primary use This building type applies to administration buildings, multi-tenant offices, and other similar facilities. Some amount of office space is common to just about all the building types listed in Table 9.5.1, but this office space was accounted for when the power allowances for the other building types were developed. The office building type should only be used for buildings where offices are the primary use.This building type applies to administration buildings, multi-tenant offices, and other similar facilities. Some amount of office space is common to just about all the building types listed in Table 9.5.1, but this office space was accounted for when the power allowances for the other building types were developed. The office building type should only be used for buildings where offices are the primary use.

12. Codes & Standards Training Series 12 Q&A-Building Area Method Q: The lighting system for an office building is constructed in phases. The lighting systems for the entrance lobby, the toilets, and other common building areas are included with the plans and specifications for the base building. As tenants move into the building, the tenant improvement plans will include the lighting system for each tenant space. Can the building area method be used for the base building lighting system? What about the tenant lighting systems? Let�s discuss when the building area method might be used. The lighting system for an office building is constructed in phases. The lighting systems for the entrance lobby, the toilets, and other common building areas are included with the plans and specifications for the base building. As tenants move into the building, the tenant improvement plans will include the lighting system for each tenant space. Can the building area method be used for the base building lighting system? What about the tenant lighting systems? Let�s discuss when the building area method might be used. The lighting system for an office building is constructed in phases. The lighting systems for the entrance lobby, the toilets, and other common building areas are included with the plans and specifications for the base building. As tenants move into the building, the tenant improvement plans will include the lighting system for each tenant space. Can the building area method be used for the base building lighting system? What about the tenant lighting systems?

13. Codes & Standards Training Series 13 Q&A-Building Area Method Q: The lighting system for an office building is constructed in phases. The lighting systems for the entrance lobby, the toilets, and other common building areas are included with the plans and specifications for the base building. As tenants move into the building, the tenant improvement plans will include the lighting system for each tenant space. Can the building area method be used for the base building lighting system? What about the tenant lighting systems? A: The building area method may be used for either the tenant spaces or the base building when separately metered or permitted. The answer is yes on both counts. The building area method may be used for either the tenant spaces or the base building when they are separately metered or permitted.The answer is yes on both counts. The building area method may be used for either the tenant spaces or the base building when they are separately metered or permitted.

14. Codes & Standards Training Series 14 Q&A-Tradeoffs Q: A building has retail on the ground level and offices on the upper levels. Can the designer make trade-offs between interior lighting in the retail and office areas? Let�s further discuss trading wattages between spaces. A building has retail on the ground level and offices on the upper levels. Can the designer make wattage trade-offs between the interior lighting in these two areas? Let�s further discuss trading wattages between spaces. A building has retail on the ground level and offices on the upper levels. Can the designer make wattage trade-offs between the interior lighting in these two areas?

15. Codes & Standards Training Series 15 Q&A-Tradeoffs Q: A building has retail on the ground level and offices on the upper levels. Can the designer make trade-offs between interior lighting in the retail and office areas? A: Depends on whether or not the two areas are under separate electrical permits. The designer can make trade-offs between the interior lighting for the two occupancies as long as one electrical permit is issued for both the office and retail lighting systems. If the lighting systems for the retail and office portions of the building are constructed under separate electrical permits (which is the more likely scenario), then each building occupancy would have to independently comply with the lighting requirements and no tradeoffs would be permitted between them.The designer can make trade-offs between the interior lighting for the two occupancies as long as one electrical permit is issued for both the office and retail lighting systems. If the lighting systems for the retail and office portions of the building are constructed under separate electrical permits (which is the more likely scenario), then each building occupancy would have to independently comply with the lighting requirements and no tradeoffs would be permitted between them.

16. Codes & Standards Training Series 16 Q&A-Building Area Method Q: A one-story building measures 200 ft by 100 ft and consists of an office area and an unconditioned warehouse. The office area is 75 ft by 100 ft measured from the outside edge of the exterior walls to the center of the partition wall. The warehouse is 125 ft by 100 ft measured likewise. What is the gross lighted area? What is the interior lighting power allowance using the building area method? A one-story building measures 200 ft by 100 ft and consists of an office area and an unconditioned warehouse. The office area is 75 ft by 100 ft measured from the outside edge of the exterior walls to the center of the partition wall. The warehouse is 125 ft by 100 ft measured likewise. What is the gross lighted area? What is the interior lighting power allowance using the building area method? A one-story building measures 200 ft by 100 ft and consists of an office area and an unconditioned warehouse. The office area is 75 ft by 100 ft measured from the outside edge of the exterior walls to the center of the partition wall. The warehouse is 125 ft by 100 ft measured likewise. What is the gross lighted area? What is the interior lighting power allowance using the building area method?

17. Codes & Standards Training Series 17 Q&A-Building Area Method Q: A one-story building measures 200 ft by 100 ft and consists of an office area and an unconditioned warehouse. The office area is 75 ft by 100 ft measured from the outside edge of the exterior walls to the center of the partition wall. The warehouse is 125 ft by 100 ft measured likewise. What is the gross lighted area? What is the interior lighting power allowance using the building area method? A: GLA of the entire building is 100 ft x 200 ft = 20,000 ft�. Office portion is 7,500 ft� and Warehouse is 12,500 ft�. The interior LPD allowance for the office portion of the building is 1.0 W/ft� and for the warehouse it is 0.8 W/ft�. ?Lighting Power Allowance = (1.0 � 7,500) + (0.8 � 12,500) = 17,500W. Watts tradable between areas if: One permit application and as long as the overall interior lighting power is no more than 17,500 W. The gross lighted area of the entire building is 100 ft x 200 ft = 20,000 ft�. The gross lighted area of the office portion is 7,500 ft� and for the warehouse, it is 12,500 ft�. Using the earlier table, [C1] the interior lighting power density allowance for the office portion of the building is 1.0 W/ft� and for the warehouse it is 0.8 W/ft�. ? [C2] the Lighting Power Allowance = (1.0 � 7,500) + (0.8 � 12,500) equaling 17,500W. [C3} Provided the interior lighting system for the entire building is included under the same permit application, the designer can use more lighting power in the office and less in the warehouse (or vice versa), as long as the overall interior lighting power is no more than 17,500 W.The gross lighted area of the entire building is 100 ft x 200 ft = 20,000 ft�. The gross lighted area of the office portion is 7,500 ft� and for the warehouse, it is 12,500 ft�. Using the earlier table, [C1] the interior lighting power density allowance for the office portion of the building is 1.0 W/ft� and for the warehouse it is 0.8 W/ft�. ? [C2] the Lighting Power Allowance = (1.0 � 7,500) + (0.8 � 12,500) equaling 17,500W. [C3} Provided the interior lighting system for the entire building is included under the same permit application, the designer can use more lighting power in the office and less in the warehouse (or vice versa), as long as the overall interior lighting power is no more than 17,500 W.

18. Codes & Standards Training Series 18 Session Complete Submit an evaluation about this training session at: http://www.surveymonkey.com/s/75WVJXR Thank you! Please submit questions to: Richard.Heinisch@AcuityBrands.com That completes this session. We want to provide you with the best possible training experience, so please take 2 minutes to complete the survey at the link provided here. Thank you.That completes this session. We want to provide you with the best possible training experience, so please take 2 minutes to complete the survey at the link provided here. Thank you.