3.9.9

Typical School Building (1)

Pre-1980

Post-1980

Stock Floor Area (billion SF)

7.482

0.595

Floor-Area Weighted Averages

Building Area (thousand SF)

22 - 47

16 - 26

Floors

2

2

Shell

Percent Glass

27

18

Window R-Value

1.39 - 1.6

1.67 - 1.71

Window Shading Coefficient

0.80 - 0.83

0.71 - 0.73

Wall R-Value

2.7 - 3.4

5.3 - 5.7

Roof R-Value

10.1 - 10.9

12.6 - 13.3

Wall Material

masonry

masonry

Roof Material

built-up

built-up

Occupancy

Average Occupancy (SF/person)

105

105

Weekday Hours (hrs/day)

8

8

Weekend Hours (hrs/day)

2

2

Equipment

Average Power Density (W/SF)

0.8

0.8

Full Equipment Hours (hrs/year)

1,136

1,136

Lighting

Average Power Density (W/SF)

1.8

1.7

Full Lighting Hours (hrs/year)

2,436

2,436

System and Plant

System and Distribution Type

6 (Classrooms, Gym,

1 Central System

Auditorium, Dining, Kitchen)

Packaged Multi-Zone w/ Economizer

Unit Ventilators

Heating Plant

Gas Boiler

Gas Boiler

Cooling Plant

Hermetic Centrifugal Chiller

Hermetic Centrifugal Chiller

Service Hot Water

Gas Boiler

Gas Boiler

Note(s):

1) The prototypes are synthetic buildings compiled from statistical data from building surveys or conclusions from previous studies. The physical characteristics, system characteristics, and usage patterns are based upon various surveys, studies, engineering estimates, or engineering judgment.