### 4A -i 

## APPENDIX 4A. CHARACTERISTICS OF MEDIUM OFFICE REFERENCE

BUILDING MODEL AND MODULAR CLASSROOM MODEL

TABLE OF CONTENTS

4A.1 Introduction ...................................................................................................................... 4A-1

4A.2 Medium Office Reference Building Model Description ................................................. 4A-1

LIST OF TABLES

Table 4A.2.1. Description of DOE Reference Medium Office Building Model ...................... 4A-2

Table 4A.2.2. Key Schedules for DOE Reference Medium Office Building Model ............... 4A-8

### 4A -1 

## A PPENDIX 4A. CHARACTERISTICS OF MEDIUM OFFICE REFERENCE BUILDING

MODEL AND MODULAR CLASSROOM MODEL

4A.1 I NTRODUCTION

The analysis of baseline energy consumption for both water-cooled air conditioners and

evaporatively cooled air conditioners discussed in chapter 4 were based on simulation data for

DOE’s medium office reference building model. This appendix provides key characteristics of

the DOE medium office reference building model which formed the basis of this data. Further

details and background may be found in the documentation and through review of the input files

available at

< http://www1.eere.energy.gov/buildings/commercial_initiative/new_construction.html >.

4A.2 MEDIUM OFFICE REFERENCE BUILDING MODEL DESCRIPTION

Table 4A.2.2 provides a high level description of the DOE medium office reference

building model.

### 4A -2 

## Table 4A.2.1. Description of DOE Reference Medium Office Bu ilding Model

Item Description

Program

Vintage NEW CONSTRUCTION

Location

(Representing 8 Climate Zones) Zone 1A: Miami (very hot,

humid)

Zone 2A: Houston (hot,

humid)

Zone 2B: Phoenix (hot, dry)

Zone 3A: Memphis (warm,

humid)

Zone 3B: El Paso (warm, dry)

Zone 3C: San Francisco

(warm,marine) Zone 4A: Baltimore (mild,

humid)

Zone 4B: Albuquerque (mild,

dry)

Zone 4C: Salem (mild, marine)

Zone 5A: Chicago (cold,

humid)

Zone 5B: Boise (cold, dry) Zone 6A: Burlington (cold,

h umid)

Zone 6B: Helena (cold, dry)

Zone 7: Duluth (very cold)

Zone 8: Fairbanks (subarctic)

Available fuel types gas, electricity

Building Type (Principal Building Function) OFFICE

Building Prototype Medium Office

Form

Total Floor Area (sq feet) 53,600

(163.8 ft x 109.2 ft)

### 4A -3 Item Description

Building shape

Aspect Ratio 1.5

Number of Floors 3

Window Fraction

(Window

- to

- Wall Ratio) 33%

Window Locations even distribution among all four sides

Shading Geometry none

Azimuth non

- directional

### 4A -4 Item Description

Thermal Zoning Perimeter zone depth: 15 ft.

Each floor has four perimeter

zones and one core

zone. Percentages of floor area:

Perimeter 40%, Core 60%

Floor to floor height (feet) 13

Floor to ceiling height (feet) 9

(4 ft above

- ceiling plenum)

Architecture

Exterior walls

Construction Steel

- Frame Walls

U

- factor (Btu / h * ft 2 

### * °F) and/or

R- value (h * ft 2 

### * °F / Btu) ASHRAE 90.1

- 1997 Requirements

Nonresidential; Walls, Above

- Grade, Steel

- Framed

Roof

Construction Built

- up Roof:

Roof membrane+Roof insulation+metal decking

U

- factor (Btu / h * ft 2 

### * °F) and/or

R- value (h * ft 2 

### * °F / Btu) ASHRAE 90.1 Requirements

Nonresidential; Roofs, Insulation entirely above deck

Window

### 4A -5 Item Description

U

- factor (Btu / h * ft 2 

### * °F) ASHRAE 90.1 Requirements

Nonresidential; Vertical Glazing, 31.1

- 40%, U_fixed

SHGC (all)

Operable area 0

Foundation

Foundation Type Slab

- on

- grade floors (unheated)

Construction 8" concrete slab poured directly on to the earth

Thermal properties for ground level floor

U- factor (Btu / h * ft2 * °F)

and/or

R

- value (h * ft2 * °F / Btu) ASHRAE 90.1 Requirements

Nonresidential; Slab

- on

- Grade Floors, unheated

Infiltration

Infiltration Peak: 0.2016 cfm/sf of above grade exterior wall surface area (when fans turn off)

Off Peak: 25% of peak infiltration rate (when fans turn on)

HVAC

System Type

Heating type Gas furnace inside the packaged air conditioning unit

Cooling type Packaged air conditioning unit

Distribution and terminal units VAV terminal box with damper and electric reheating coil

Zone control type: minimum supply air at 30% of the zone design peak supply air.

HVAC Sizing

Air Conditioning autosized to design day

Heating autosized to design day

HVAC Control

Thermostat Setpoint 75°F Cooling/70°F Heating

Thermostat Setback 80°F Cooling/60°F Heating

Economizers Various by climate location and cooling capacity

Control type: differential dry bulb

### 4A -6 Item Description

Ventilation ASHRAE Ventilation Standard 62.1

- 1999

0.10 cfm/sf

.

Supply Fan

Fan schedules See under HVAC Operation Schedules , Below

Supply Fan Total Efficiency (%) 60% to 62% depending on the fan motor size

Supply Fan Pressure Drop Varies depending on the Equipment Type

Internal Loads & Schedules

Lighting

Average power density (W/ft 2 

### ) ASHRAE 90.1

- 2004

Lighting Power Densities Using the Building Area Method

Schedule See under Schedules , Below

Daylighting Controls ASHRAE 90.1 Requirements

Occupancy Sensors ASHRAE 90.1 Requirements

Plug load

Average power density (W/ft 2 

### ) 0.75

Schedule

See under Schedules , Below

Occupancy

Average people 268 Total (5 persons/1000 sf)

Schedule

See under Schedules , Below

Misc.

Elevator

Quantity 2

Motor type hydraulic

Peak Motor Power

(W/elevator) 16,055

### 4A -7 Item Description

Heat Gain to Building Interior

Peak Fan/lights Power

(W/elevator) 161.9

Exterior Lighting

Peak Power (W) 2,740

Schedule See under Schedules , Below

### 4A -8 

## Table 4A.2.2. Key Schedules for DOE Reference Medium Office Building Model

Schedule Type Through Day of Week 1 am 2 am 3 am 4 am 5 am 6 am 7 am 8 am 9 am 10 am 11 am Noon

Internal Loads Schedules

BLDG_LIGHT_SCH Fraction Through 12/31 WD, SummerDesign 0.05 0.05 0.05 0.05 0.05 0.1 0.1 0.3 0.9 0.9 0.9 0.9

Sat, WinterDesign 0.05 0.05 0.05 0.05 0.05 0.05 0.1 0.1 0.3 0.3 0.3 0.3

Sun, Hol, Other 0.05 0.05 0.05 0.05 0.05 0.05 0.05 0.05 0.05 0.05 0.05 0.05

BLDG_EQUIP_SCH Fraction Through 12/31 WD, SummerDesign 0.4 0.4 0.4 0.4 0.4 0.4 0.4 0.4 0.9 0.9 0.9 0.9

Sat, WinterDesign 0.3 0.3 0.3 0.3 0.3 0.3 0.4 0.4 0.5 0.5 0.5 0.5

Sun, Hol, Other 0.3 0.3 0.3 0.3 0.3 0.3 0.3 0.3 0.3 0.3 0.3 0.3

BLDG_OCC_SCH Fraction Through 12/31 WD 0 0 0 0 0 0 0.1 0.2 0.95 0.95 0.95 0.95

SummerDesign 0 0 0 0 0 0 1 1 1 1 1 1

Sat, WinterDesign 0 0 0 0 0 0 0.1 0.1 0.3 0.3 0.3 0.3

Sun, Hol, Other 0 0 0 0 0 0 0.05 0.05 0.05 0.05 0.05 0.05

HVAC Schedules

HVACOperationSchd on/off Through 12/31 WD, SummerDesign 0 0 0 0 0 0 1 1 1 1 1 1

(Fan Schedule) Sat, WinterDesign 0 0 0 0 0 0 1 1 1 1 1 1

Sun, Hol, Other 0 0 0 0 0 0 0 0 0 0 0 0

Schedule Type Through Day of Week 1 pm 2 pm 3 pm 4 pm 5 pm 6 pm 7 pm 8 pm 9 pm 10 pm 11 pm 12 pm

Internal Loads Schedules

BLDG_LIGHT_SCH Fraction Through 12/31 WD, SummerDesign 0.8 0.9 0.9 0.9 0.9 0.5 0.3 0.3 0.2 0.2 0.1 0.05

Sat, WinterDesign 0.15 0.15 0.15 0.15 0.15 0.05 0.05 0.05 0.05 0.05 0.05 0.05

Sun, Hol, Other 0.05 0.05 0.05 0.05 0.05 0.05 0.05 0.05 0.05 0.05 0.05 0.05

BLDG_EQUIP_SCH Fraction Through 12/31 WD, SummerDesign 0.8 0.9 0.9 0.9 0.9 0.5 0.4 0.4 0.4 0.4 0.4 0.4

Sat, WinterDesign 0.35 0.35 0.35 0.35 0.35 0.3 0.3 0.3 0.3 0.3 0.3 0.3

Sun, Hol, Other 0.3 0.3 0.3 0.3 0.3 0.3 0.3 0.3 0.3 0.3 0.3 0.3

BLDG_OCC_SCH Fraction Through 12/31 WD 0.5 0.95 0.95 0.95 0.95 0.3 0.1 0.1 0.1 0.1 0.05 0.05

SummerDesign 1 1 1 1 1 1 1 1 1 1 0.05 0.05

Sat, WinterDesign 0.1 0.1 0.1 0.1 0.1 0.05 0.05 0 0 0 0 0

Sun, Hol, Other 0.05 0.05 0.05 0.05 0.05 0.05 0 0 0 0 0 0

HVAC Schedules

HVACOperationSchd on/off Through 12/31 WD, SummerDesign 1 1 1 1 1 1 1 1 1 1 0 0

(Fan Schedule) Sat, WinterDesign 1 1 1 1 1 1 0 0 0 0 0 0

Sun, Hol, Other 0 0 0 0 0 0 0 0 0 0 0 0