Acknowledgement:Thanks to Sustainable Buildings Industry Council (SBIC) for providing the materials

to provide a tool that a designer will use routinely to guide his or her decisions while developing the design of low- energy building.

Eventually all buildings will be designed to be delightful living, working, and learning environments, enhanced by natural light, requiring minimum resources to build and operate,

–and that do not impair the environment for following generations.

This library, built in 1980, has saved about 39 billion Btu (about $740,000) over its 20 years operation, compared to a typical library. It cost no more to build and gets rave reviews from the librarians and users.

ENERGY-10 Design Tool

ENERGY-10

ENERGY-10 is suitable for smaller buildings–commercial and institutional buildings under 10,000 sq. ft. – and also residential

<10,000 sq

76% of all non-residential buildings are under 10,000 sq. ft., representing 22 % of the total built floor area and 26% of the energy use.

This restriction will be removed in Version 2

ENERGY-10 Design Tool

ENERGY-10

National Renewable Energy Lab

project lead, passive solarbuildings expertise, PV

Sustainable BuildingsIndustry Councildistribution, user support

training

Lawrence BerkeleyNational Lab

daylighting

Berkeley SolarGroup

CNE thermal simulation engine

U.S. Department of Energy

funding and oversight

ENERGY-10 Design Tool

ENERGY-10

The Progressive Architecture Research Award was given to NREL and SBIC for the Designing Low-Energy Buildings with ENERGY-10 package.

Doug Balcomb, author of ENERGY-10 receiving the award in the Grand Ballroom at the Waldorf Astoria, New York

ENERGY-10 Design Tool

ENERGY-10

First user-friendly program based on hour-by-hour building simulation targeting early conceptual design decisions

Automates many routine tasks, reducing time to produce results needed to make design decisions from days to hours

Graphic input and output Technically solid Becoming widely used, both in practice and

for teaching Major enhancements are in the pipeline

Graphic input, Improved Daylighting, PV…

ENERGY-10 Design Tool

ENERGY-10

Evaluate a wide range of energy-efficient strategies, working together

Daylighting

Economizer cycle

Reduced duct leakage

Reduced infiltration

Insulation

Lighting controlsEnergy efficient lights

and ballasts

Passive solar heating

Thermal mass

Shading

Better HVAC Controls

High Efficiency HVAC

Better windows

ENERGY-10 Design Tool

ENERGY-10

ENERGY-10 focuses on the first phases (conceptual design)

Develop Brief

Pre-design

Schematic Design

Design Development

Construction Documents

Develop reference caseDevelop low-energy case

Rank order strategiesInitial strategy selection

Set performance goals

Review goalsReview strategies

Set criteria, priorities

Develop schemesEvaluate schemesSelect scheme

Confirm that component performances

are as assumed

Phase

Activity

Tool

ENERGY-10

Preliminary teammeetings

ENERGY-10

EnergyPlusor other

HVAC simulationand tools

ENERGY-10 Design Tool

ENERGY-10

Automatic features make it easy and fast AutoBuild - defines a complete building

based on five inputs and many defaults APPLY - creates a second building

applying upgrades to implement any or all of 12 energy-efficient strategies

RANK - determines relative effectiveness of strategies

ENERGY-10 Design Tool

ENERGY-10

Creates two building descriptions based on five inputs and user-defined defaults.

Reference Case Low Energy Case

R-8.9 walls (4" steel stud) R-19.6 Walls (6" steel stud with 2" foam)R-19 roof R-38 roofNo perimeter insulation R-10 perimeter insulationConventional double windows Best low-e double windowsConventional lighting Efficient lights with daylight dimmingConventional HVAC High efficiency HVACConventional air-tightness Leakage reduced 75% Uniform window orientation Passive solar orientationConventional HVAC controls Improved HVAC controlsConventional duct placement Ducts located inside, tightened

•Location•Building Use•Floor area•Number of stories•HVAC system

For example:

Gets you started quickly.

apply

ENERGY-10 Design Tool

ENERGY-10

0

20

40

60

80

100

MW

h /

m²

Heating Cooling Lights Other Total

ANNUAL ENERGY USE

Reference Case

Low-Energy Case

30.7

0.2

10.75.7

15.1

6.6

19.314.9

75.8

27.4

20,000 m2 elementary school

ENERGY-10 Design Tool

ENERGY-10

ENERGY-10 uses the simulation engine to size HVAC equipment. The process is automatic and takes only 1 or 2 seconds.

HVAC cost reductions can pay the added cost of all the other upgrades!

kBtuh

heating CFM

HVAC RATED CAPACITIES, Albuquerque SchoolReference Case Low-Energy Case

802

349

687

478

29484

21162

cooling

Provides the right information at the right time.

ENERGY-10 Design Tool

ENERGY-10

Automatically modifies the building description to implement any or all of 12 strategies

A few mouse clicks does it—saving timeYet the user has total control

Heating

Cooling

Lights

Other

Total

Beforeapply

Afterapply

ENERGY-10 Design Tool

ENERGY-10

Procedures, such as sequencing simulations and rank ordering, are automated, greatly reducing the time required. This entire set of calculations, including making the plot, took

about 10 minutes.Parametric analysis helps guide decisions regarding best strategies to meet

design team goals

New ranking options in Version 1.5:

Net present value

Internal rate of return

Benefit/cost ratio

Simple payback

gives the relative savings

if strategies were to applied

individually

-20 0 20 40 60 80

Economizer CycleShading

High Efficiency HVACPassive Solar Heating

Air Leakage Control

HVAC ControlsEnergy Efficient Lights

Glazing

Insulation

Duct Leakage

Net Present Value, k$

78.39

66.38

45.96

40.82

38.73

35.89

26.22

21.12

13.67

Daylighting 48.85

2.85

RANKING OF ENERGY-EFFICIENT STRATEGIES

ENERGY-10 Design Tool

ENERGY-10

EVALUATEMany powerful graphical views of the data

ADJUST create new weather files expands the available sites 16 fold

CONVERT FILE FORMATS

10

20

30

40

50

60

70

80

90

100

Jan Feb Mar Apr May Jun Jul Aug Sep Oct Nov Dec Jan

Temp

eratur

e, °F

Temperatures Memphis, Tennessee

January 01 - 12 AM to January 01 - 12 AM

Dry Bulb

ENERGY-10 Design Tool

ENERGY-10

Full discounted cash flow analysis, accounting for all relevant factors to support cost/tradeoff decisions during conceptual design

Ranks based on LCC, IRR, benefit/cost, or simple payback

ENERGY-10 Design Tool

ENERGY-10

0

200

400

600

800

1000

1200

1400

SO2 NOx CO2

lbs

0

50000

100000

150000

200000

250000

Ann

ual C

O2

Em

issi

ons,

Pou

nds

Reference Case Low-Energy Case

1215

729662

382

249007

128607

0

100

200

300

400

Heating Cooling Fan

kBtu

h

0

2000

4000

6000

8000

10000

12000

Fan

Vol

ume,

CF

M

HVAC Rated CapacitiesReference Case Low-Energy Case

386

157

358

230

10741

6851

0

20

40

60

80

100

Loads Consumption Cost

Ann

ual E

nerg

y, k

Btu

/ sq

. ft.

0.0

0.2

0.4

0.6

0.8

1.0

Ann

ual C

ost,

$/sq

. ft.

Low-Energy Case - Performance Summary

OtherLightingCoolingHeating

1.3

40.2

10.3

34.2

2.97.6

10.3

34.2

86.0

55.1

$0.90

0.010.12

0.16

0.60

DMAP (3D color)

Solar gains in a passive solar building every hour of the year

Annual Emissions Results

Summary

ENERGY-10 Design Tool

ENERGY-10

Evaluatebuilding energy performance

Reference Case (energy hog)

Low Energy Case

Apply Strategies

ENERGY-10 Design Tool

ENERGY-10