the value of r-value
DESCRIPTION
The Value of R-Value. Home Energy Use. School Energy Use. Natural Gas. Electricity. Energy Efficiency. Whole House Approach. Comfort and the Building Shell. Heat Removed by Cooling System. Heat Supplied by Heating System. Internal and Solar Heat. - PowerPoint PPT PresentationTRANSCRIPT
The Value of R-Value
Home Energy Use
School Energy Use
Natural Gas Electricity
Energy Efficiency
Whole House Approach
Reduce energy demand
•Behavior changes•Air sealing•Insulation•Landscaping and windows
Use energy efficiently •Heating and cooling equipment
•Transport•Lighting and appliances
Use clean sources •Solar
•Geothermal•Wind
Comfort and the Building Shell
Solar heatAir
Leakage
Internal Heat
Trans-mission
Heat Removed by Cooling System
Ceiling Transmission
Wall, Fenestration, Foundation
Transmission
Air Leakag
e
Heat Supplied by Heating System Internal and Solar Heat
Source: Residential Energy, 5th Edition
Cold
clim
ate
hom
es w
ith m
a-jor
air
leaka
ge o
r ins
ulat
ion
prob
lems
Aver
age
cold
clim
ate
hom
es
Aver
age
tem
pera
te c
limat
e ho
mes
Well
insu
lated
hom
es w
ith
low a
ir lea
kage
Very
well
insu
lated
and
air
tight
hom
es w
ith h
eat-
reco
very
ven
tilat
ors
0
20
40
60
BTUs per Hour per Square Foot
0400800
1200
Square Feet Cooled per Ton
Variations in Load
Source: Residential Energy, 5th Edition
Recommended R-Values for Colorado
Source: Colorado Governor’s Energy Office
Space Recommended R-Value
Attic 49
Wall 18
Floor 25
Crawlspace 19
Basement 11
Which is better?
Passivhaus