Post on 31-Mar-2015
Energy Conservation
1.Air Sealing Holes/Cracks 2. Improved Insulation 3. Increased Efficiency of Heating/Cooling &
Domestic Hot Water (DHW)4.Lighting & Efficient Appliances/Products 5.Staff and resident education
Top Energy Reduction Strategies
Major Home Energy Usage Air SealingAir Sealing
Energy Loss: Infiltration & Ventilation
Common Air Sealing Opportunities–Electrical penetrations–Plumbing penetrations–Window framing–Wall to floor
connection–Doors and vestibules–Basement ceiling–In-unit ventilation
grills–Ducts, plenums,
registers
General Air Sealing Guidelines
Gaps ≤ 1/4"
CaulkGaps 1/4" – 3"
Spray foam
OtherFoam board,
fiberglass in plastic bags, etc.
General Air Sealing Guidelines
Doors & Windows
Weatherstripping
Ducts & Plenums
Mastic, Duct Tape
How did the resident cut their bill in half? Insulation Insulation & Other EnvelopeImprovements
Measuring the Efficacy of Insulation
R-value: The measure of a material’s resistance to heat transfer.
Insulation Target R-Values
www.naima.org
Blown-In Attic Insulation
How much is in that back corner?
Staple rulers every 15 feet for even coverage
Source: www.waptac.org
Reality
Other Envelope Strategies
Solar Screens
Reflective Metal
Roof
Radiant Barrier
How a smart strip surge protector works Lighting & AppliancesLighting & Appliances
ENERGY STAR
ENERGY STAR-certified products meet energy efficiency standards set by the U.S.
Environmental Protection Agency. They are tested in laboratories and off-the-shelf.
Where to Use ENERGY STAR Lighting?
17
Rooms Family and living
room Kitchen Dining room Porch
Fixtures Table lamps Floor lamps Wall sconces Pendants Open ceiling fixtures
Lighting: Use Sensors & Bi-level Lighting Occupancy or motion sensors turn lights on
when people enter the area Photo Sensors sense light and turn lights on
and off based on light levels inside and out Bi-level lighting dims lights when
no one is present Good for areas
where light levels have to be maintained and not off to meet code
Foundation Communities Lighting Inventory
Goal: Comprehensive inventory of all lighting fixtures at FC for use in planning phased lighting upgrade
Timeframe: May-October 2013
Energy Star Products/AppliancesENERGY STAR Available: Bathroom Fans Refrigerator Computer Window Kitchen Fans Air Conditioning Units Hot Water Heaters Heating/Cooling
Equipment Dishwasher Lighting Dehumidifier Clothes Washer
ENERGY STAR NOT Available:
Clothes Dryer Mini fridge Stove Microwave
Measuring Phantom Loads
Ways to save energy through purchasing HVAC & Domestic Hot Water (DHW)HVAC & Domestic Hot Water (DHW)
A Few Measures of Efficiency
SEER: Measures AC efficiency (split systems) EER: Measures AC efficiency (PTACs) EF: Measures appliance efficiency, including
water heaters
Replacing HVAC
Buy high-efficiency equipment 14.5 SEER for split system HVACs 10.8 EER for heat pump PTACs
Have the equipment sized to load, ask your engineer to show the math (Ask for the ACCA Manual J report) Measured in tons of cooling
Use R410 Refrigerant
Typical Hot Water Heaters Inefficient Short life Can spill or backdraft
products of combustion
Notorious for carbon monoxide production
Alternative Hot Water Heat Pump Water
Heater Tankless Gas Water
Heater
Alternative Hot Water Solar Thermal Gas Condensing
How did the resident cut their bill in half? Evaluating Multifamily BuildingsEvaluating & UpgradingMultifamily Buildings
Benchmarking: Read Your Utility BillLook at the utility bill and answer the following
questions.1. What is the total bill amount?2. What is the invoice date?3. What was the electric consumption in kWh?
What was the demand in kW?4. Look at the account breakdown on the
second page.1. What are the different per-kW charges? (Identify
charge type and amount.)2. What are the different per-kWh charges? (Identify
charge type and amount.)
Conduct An Energy Audit Different levels of auditing by increasing
complexity Walkthrough audits Weatherization audits Whole building audits Investment grade audits
Hire an expert BPI certified Uses ASHRAE standards
Choose Upgrades
Focus on the top five strategies
1.Air Sealing Holes/Cracks 2. Improved Insulation 3. Increased Efficiency of Heating/Cooling &
Domestic Hot Water (DHW)4.Lighting & Efficient Appliances/Products 5.Staff and resident education
Simple Payback
A way to calculate the time it will take to recuperate your investment in resource efficiency upgrades.
Simple payback period =
(in years)
Cost of efficiency measure
Annual savings
Simple Payback - Practice
Measure Cost Annual Savings
1 New 14.5 SEER split system HVAC, installed
$2,500 $500
2 LED light bulb $15 $16.30
3 R-38 insulation $1,800 $275
Simple payback period =
(in years)
Cost of efficiency measure
Annual savings
How did the resident cut their bill in half? Evaluating Multifamily BuildingsEasy, Free Things You Can Do Today
Easy & Free
1. Shut windows & doors when HVAC is on2. Lower the set temperature of your water
heater (~120°F)3. Lower the set temperature of your furnace
(65° - 70°F4. Raise the set temperature of your A/C (76°
- 82°F)5. Shut off phantom loads6. Program your thermostat