Better and Best: Energy Efficiency at Armory Park del Sol

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More technologies used in the Zero Energy House

June 01, 2003
Technology
Typical Armory Park del Sol Home $333,000
for 1717 square feet
The Zero Energy Home $376,000 for 1717
square feet ($43,000 additional*)
Manufacturer
User notes
Photovoltaic
panels
1 kWh
3.5 kWh
BP Solar
through Dankoff Solar and The Solar Store;
SMA America
(inverters)
Additional PV
power accounts for most of the additional cost in the ZEH.
HVAC Equipment
Heat pump with 12 SEER
cooling, 7.5 HSPF
An 18-SEER,
2-speed air conditioning system with variable speed air handler
Carrier
The high-efficiency air
conditioner in the ZEH takes ½ the usual energy to run; very quiet. Sized to
run at low speed most of the time.
Water/space
heating
A solar water heater only
(with back-up provided by on-demand tankless water heater)
An innovative,
integrated solar water and space heating system (with back-up provided by
on-demand tankless water heater )
SunEarth Inc.
(solar collectors);
Seisco
(tankless water heaters)
Of all the
energy features in ZEH, the biggest additional installation cost. System is
sized to provide all water and 80% of space heating needs.
Plumbing
system for hot water supply
Copper
plumbing supply buried in concrete slab
PEX plumbing
lines for hot water supply
Manifold
provided by Sioux Chief Manufacturing
Hot water lines run in
conditioned space in ZEH.
Plumbing vents
Conventional
through-the-roof plumbing vents
Air admittance
vents (AAV)
Studor (AAV)
A break-even on cost: more
for the AAV, but less on labor and roof vents. The elimination of roof
penetrations is advantageous for the solar installation.
High
efficiency windows
Double pane,
low-e, vinyl, with argon (Windows have a low solar heat gain coefficient)
Double pane,
low-e, vinyl, with argon
Milgard
NAHB Research Center
simulations showed Miller’s typical
windows were compatible with ZEH requirements.
Roof decking
Standard OSB
Radiant
barrier roof decking
TechShield
Radiant barrier technology
is advantageous in cooling climate.
Lamps and
permanent
fluorescent lighting fixtures
Incandescent
lamps and ceiling fans. Permanent fluorescents in garage and kitchen.
Permanent
fluorescent lighting used throughout house. Two-lamp fixtures provide
half-dimming.
Nora Lighting;

Osram Sylvania
(lamps);
Sun Lighting
(supplier)

Super energy efficient
bulbs and fixtures run
an extra $2,800. Saves on
cooling as well as running the lights.

In the ZEH, when possible,
decorative lights were fitted with CFLs or supplied with dimmer switch.

Ceiling fans
Ceiling fans
with light kits
Energy
efficient ceiling fans without light kits
Emerson Fans
Fans without light kits
may reduce inadvertent lighting energy use.
High
efficiency appliances
ENERGY STAR
qualified dishwasher, range and microwave/ ventilating hood combination
Additional ENERGY
STAR® qualified appliances (refrigerator, washer, dryer)
Whirlpool
The Duet front-loading
washer will use about 1/3 of the water and energy of conventional washers
Bath fans
Standard
efficiency fans
ENERGY STAR®
qualified bath fans
Panasonic
High efficiency fans offer
quieter operation as well as cost savings.

* Additional cost for a Zero Energy Home is based on aplan built with typical APdS specs. Cost does not reflect homeowner's Sunshare rebate of $5,000 for additional photovoltaics. Pricing reflects upgrade package (appliances, surfaces, fixtures, etc.).

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