zero energy home rob, alex, karen, iman. project overview project goals: -creating a zero energy...
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Zero Energy HomeRob, Alex, Karen, Iman
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Project OverviewProject Goals:-Creating a Zero Energy Home that is still our dream home where we would all desire to live.-Designing in a way that is energy efficient and aesthetically pleasing
Important Features:-2 story arched windows on South wall-Spiral staircase-2 story sunroom with mass floor-Solar water heater-Open kitchen -TV / media room -Best for family of 4-6 people
House Size 2852 sq. ft.
Number of floors 2
Number of bedrooms 4
Heating System High Efficiency heat pump
Size of PV system 7.3
R-value for ceiling 60
Wall Construction Double 2x4 with 10” foam
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Research Summary
Typical Characteristics of ZEH based on team research:
-All homes researched under 2000 sq. ft.
-Ventilation air heat recovery and solar water heater systems
-Most common heating system – heat pumps
-Photovoltaic systems range from 4.2-8.2 kW in size
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Research Summary- 1152 sq. ft.- 1949 kWh used and 4892 kWh
produced annually -light skirt glows red when using energy from grid and green when producing more than it uses
2000 sq.ft. home with only a 4.2 PV system
- ZEH can be simple, unique, unusual or anywhere in between
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Envelope- 473 sq. ft. of windows main cause
of air leakage
- Ceiling R value of 60
- Double 2x4 wall construction with 10” insulation
- Double low e windows-chose cheaper model because triple low e let out less heat but also let in less passive solar heat.
-about the same efficiency
- Air tight with heat recovery-utilizing this option allowed us to decrease size of PV system
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AppliancesSony 46” LCD Television -213 kWh/year-$989.99 -Yearly opp costs $21.30-Not most energy efficient-Best choice economically
Amana 24.9 Cu. Ft. French Door Refrigerator
-683 kWh/year-$1708.20-Yearly opp costs $73-Not Energy Star -Most cost efficient
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AppliancesGE 24 In. Built-In Dishwasher-324 kWh/year-$299.99-Yearly opp costs $28-Energy Star -Most efficient for economic value
Whirlpool Lunar Silver Duet HE 4.4 cu
- 183 kWh/year-$980.99-Yearly opp costs $25-Energy Star -More expensive – ten years to pay back cost difference
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HVAC Electric High Efficiency Heat
Pump
-More than 100% efficient
-Only small system necessary due to passive solar
-Delivers both heating and cooling
-Utilizing high efficiency dropped pv system size by .5 kW
-Saved $86 in utilities
Duct Location: Inside thermal envelope
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Solar Technologies
- 7.3 kW PV System
- 30 panels needed
- SolarWorld Sunmodule+
- 245 watt panels
- $661.81 per panel
- Cheap model with correct dimensions to support our energy needs
Solar Water Heater Utilized
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Passive Solar- 3’ Overhang shades
2nd story windows on South walls in summer
- 383 sqft of windows on South wall
- 2 story bay windows
- Mass floor
- Smaller windows for bedrooms
- Open spaces for air circulation
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Behavior- Frequent use of clothes line (save
energy on dryer use)
- Water Conservation- air drying dishes- short showers- low water settings on clothes washer
- Very few extra appliances
- Regulating home temperatures Summer above 76°Winter 68-70°
- Recycling Practices
- Compost pile
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Key DecisionsRealized necessity to use heat recovery based on number of air changes/ hour
- Very few extra appliances to utilize less energy- Change practices (air drying) to control energy use
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SketchUp Model
North Wall – Front of House
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2nd Floor
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1st Floor
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Shadow in November at noon
Shadow in June at noon
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Physical Model
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2nd Floor
Bedroom
Bath
BedroomMasterBedroom
Bath
Closet
Spiral Staircase
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1st Floor
TV room
Bath
Bedroom SunroomKitchen
Spiral Staircase
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SummaryLessons Learned
-Teamwork – task distribution
-Solving design complications with the size and dimensions of our home
-Understanding our environmental impact (Footprint calculator)
-Interrelation of classroom lessons and their applicability to real design
Important Aspects:-2 story arched windows for passive solar
-383 sqft windows on mass wall
-Open spaces on 1st floor for air circulation and large windows
-Tight with heat recovery-High efficiency heat pump-Solar Water Heater
-7.3 kW PV System
-Combination of both ordinary and energy efficient appliances
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Greatest Challenges:
-Cutting down on size while maintaining all desired features
-Understanding the real life size of our 2852 sqft. home
-Choosing between energy efficiency and cost efficiency
Favorite Features:
-Alexandra loves the 2 story arched windows and the way the light shines in on our open sunroom.-Karen likes the openness of the house.-Rob likes the spiral staircase and how it can be viewed through the large back windows-Iman loves the aesthetic look of the house from the back (South wall view).
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ReflectionAfter completing our ZEH project, we can now understand… - how parts of a system interrelate especially those dealing with
energy - how to utilize SketchUp and SolidWorks to bring our ideas to life- that solar energy can be used in combination with energy from the grid but greatly contributes to reducing nonrenewable energy resources
Zero Energy Homes…- Do not have to be ugly or bizarre to be efficient and effective- Can still have the qualities of you dream home while lessening your ecological footprint- Are still connected to the grid but create as much
energy as they use- Work best when combined with sustainable
practices and behavior
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ReflectionWorking as a team could be improved by…
- more efficient and assertive task delegation - having better and more open communication- a more equal distribution of individuals work loads
On the next project…- we will start earlier and spread the work out over a longer period of time- we will improve at delegating tasks and making
sure everyone participates fully- our team will try to better visualize the end
product from the beginning of our design process
We remember most about using SketchUp…- that layers are very helpful in the design process- that after becoming more comfortable with the software we created a more intricate model- that precision from the earliest stages is important because imperfections cannot be easily fixed and can slow results later
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