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Meditch Murphey Architects 6900 Wisconsin Ave – Suite 500phone: (301) 657-9400 Bethesda, MD 20815www.meditchmurphey.com Designing the Zero Energy House.

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Presentation on theme: "Meditch Murphey Architects 6900 Wisconsin Ave – Suite 500phone: (301) 657-9400 Bethesda, MD 20815www.meditchmurphey.com Designing the Zero Energy House."— Presentation transcript:

1 Meditch Murphey Architects 6900 Wisconsin Ave – Suite 500phone: (301) 657-9400 Bethesda, MD 20815www.meditchmurphey.com Designing the Zero Energy House Marcie Meditch - AIA & Mike Binder – Assoc. AIA, LEED-AP

2 Meditch Murphey Architects 6900 Wisconsin Ave – Suite 500phone: (301) 657-9400 Bethesda, MD 20815www.meditchmurphey.com Who We Are Meditch Murphey Architects is a small firm based in Chevy Chase, MD. Mostly single family homes but expanding into multi-family housing, small commercial and institutional projects. Commitment to sustainable design that is comfortable, beautiful and affordable.

3 Meditch Murphey Architects 6900 Wisconsin Ave – Suite 500phone: (301) 657-9400 Bethesda, MD 20815www.meditchmurphey.com What IS Zero-Energy? Goal : House is designed to produce as much energy as it consumes on yearly basis. The power grid is our storage system.

4 Meditch Murphey Architects 6900 Wisconsin Ave – Suite 500phone: (301) 657-9400 Bethesda, MD 20815www.meditchmurphey.com Our Motivation To prove that a zero- energy, market-viable speculative house is possible. Cost competitive Beautiful Sustainable Because American energy independence is important. Because a healthy natural environment is important Bethesda Zero Chesapeake Zero

5 Meditch Murphey Architects 6900 Wisconsin Ave – Suite 500phone: (301) 657-9400 Bethesda, MD 20815www.meditchmurphey.com Highly Insulated, Tightly Sealed Envelope High Efficiency Mechanical System High-Efficiency Appliances Taking Advantage of Free Energy Solar Power – Heat and Electricity How to achieve Zero-Energy

6 Meditch Murphey Architects 6900 Wisconsin Ave – Suite 500phone: (301) 657-9400 Bethesda, MD 20815www.meditchmurphey.com Beyond Zero-Energy Water efficiency Sustainable materials LEED-H Platinum Rating Leadership in Energy & Environmental Design for Homes. Levels (high to low) Platinum Gold Silver Certified EnergyStar Home Public Outreach and Education Market Viability

7 Meditch Murphey Architects 6900 Wisconsin Ave – Suite 500phone: (301) 657-9400 Bethesda, MD 20815www.meditchmurphey.com Design Process Integrated Design Team Architect Owner Builder Mechanical Electrical and Plumbing Engineer (MEP) Structural Engineer Civil Engineer Landscape Architect LEED Consultant/Green- Rater Sustainability from Day-1 Staying focused on goals Accepting trade-offs Energy vs. water vs. materials Sustainability vs. cost Up-front vs. recurring costs Exploit synergy, know when to stop

8 Meditch Murphey Architects 6900 Wisconsin Ave – Suite 500phone: (301) 657-9400 Bethesda, MD 20815www.meditchmurphey.com The Architectural Design Comfort Aesthetics Efficiency Sustainability Cost Context Kitchen viewed from Dining RoomFront of house with entry and pergola. First floor Second floor Living room & Dining room viewed from Kitchen Solar array

9 Meditch Murphey Architects 6900 Wisconsin Ave – Suite 500phone: (301) 657-9400 Bethesda, MD 20815www.meditchmurphey.com Site Selection Infill vs. Virgin Territory Public Amenities Transportation 29 T2 32 1/4 mi 1/2 mi

10 Meditch Murphey Architects 6900 Wisconsin Ave – Suite 500phone: (301) 657-9400 Bethesda, MD 20815www.meditchmurphey.com Site Selection Infill vs. Virgin Territory Public Amenities Transportation Community Services Community Pool Bannockburn Elementary School Community Clubhouse Walt Whitman Senior High School Glen Echo Park

11 Meditch Murphey Architects 6900 Wisconsin Ave – Suite 500phone: (301) 657-9400 Bethesda, MD 20815www.meditchmurphey.com Site Selection Infill vs. Virgin Territory Public Amenities Transportation Community Services Greenspace PARK CLUBHOUSE

12 Meditch Murphey Architects 6900 Wisconsin Ave – Suite 500phone: (301) 657-9400 Bethesda, MD 20815www.meditchmurphey.com Site Selection Infill vs. Virgin Territory Public Amenities Transportation Greenspace Community Services House Orientation for optimum solar income: Passive solar design Solar hot-water and Electricity.

13 Meditch Murphey Architects 6900 Wisconsin Ave – Suite 500phone: (301) 657-9400 Bethesda, MD 20815www.meditchmurphey.com Building Demolition & Construction Waste Neighbors offered materials from existing house Cabinets, Flooring Fixtures Windows & Doors Contractor salvaged all usable materials for reuse/recycling. Very little waste sent to landfill. Framing lumber being ordered to minimize waste. All waste is being tracked. Waste materials will be sorted and recycled to greatest degree possible.

14 Meditch Murphey Architects 6900 Wisconsin Ave – Suite 500phone: (301) 657-9400 Bethesda, MD 20815www.meditchmurphey.com Envelope – Insulation The cheapest energy to buy is the energy you dont use. Continuous Air-Barrier, sealed at all openings and edges. Basement walls : R-20 (R-13 by code) Slab : R-10 Wall : R-33 (R-19 by code) Roof : R-50 (R-30 by code) High-reflectivity roofing to reduce heat island

15 Meditch Murphey Architects 6900 Wisconsin Ave – Suite 500phone: (301) 657-9400 Bethesda, MD 20815www.meditchmurphey.com Envelope – Windows Windows/Doors U-factor = 0.32 (R3) Solar Heat Gain Coeff. (SHGC) = 0.28

16 Meditch Murphey Architects 6900 Wisconsin Ave – Suite 500phone: (301) 657-9400 Bethesda, MD 20815www.meditchmurphey.com Envelope – Windows Windows/Doors U-factor = 0.32 (R3) Solar Heat Gain Coeff. (SHGC) = 0.28 Limit East and West facing Glass At least 50% more glass on North and South than on East and West. Shade South-facing Windows and Doors exclude heat in summer, admit it in winter SOUTH

17 Meditch Murphey Architects 6900 Wisconsin Ave – Suite 500phone: (301) 657-9400 Bethesda, MD 20815www.meditchmurphey.com Envelope – Windows EAST WEST NORTH SOUTH Limit East and West facing Glass At least 50% more glass on North and South than on East and West.

18 Meditch Murphey Architects 6900 Wisconsin Ave – Suite 500phone: (301) 657-9400 Bethesda, MD 20815www.meditchmurphey.com Envelope – Sustainable Materials Framing : FSC if you can afford it… we couldnt. Soy-based foam insulation Local or recycled gypsum Local, recycled, reclaimed or FSC siding. Reclaimed buildings Low VOC sealants FOREST STEWARDSHIP COUNCIL Certified

19 Meditch Murphey Architects 6900 Wisconsin Ave – Suite 500phone: (301) 657-9400 Bethesda, MD 20815www.meditchmurphey.com Passive Mechanical Systems – Natures Services Natural ventilation during swing months Operable windows Cross-ventilation Timed or Humidistat controlled fans in bathrooms. Awnings and trees reduce cooling requirements in summer. South orientation allows for some passive heating in winter.

20 Meditch Murphey Architects 6900 Wisconsin Ave – Suite 500phone: (301) 657-9400 Bethesda, MD 20815www.meditchmurphey.com Active Mechanical Systems – Heating & Cooling Geothermal – Ground Source Heat Pump Energy Recover Ventilator Sealed duct work, all INSIDE the Envelope. Mechanical Ventilation – seal tight, ventilate right – 0.35 air changes per hour. House zoned to allow upstairs and basement to be shut down when not in use. Master bedroom is also a separate zone for day-night differential control. BASEMENT ZONE 1 ZONE 2 ZONE 3 ZONE 4

21 Meditch Murphey Architects 6900 Wisconsin Ave – Suite 500phone: (301) 657-9400 Bethesda, MD 20815www.meditchmurphey.com Appliances EnergyStar Appliances Refrigerator Convection ovens Induction cooktop Dishwasher Clothes Washer (no dryer is energy efficient – consider clothesline instead) Compact Fluorescent (CFL) and LED Lights, EnergyStar Ceiling Fans. Gas fireplace w/ Electronic Ignition

22 Meditch Murphey Architects 6900 Wisconsin Ave – Suite 500phone: (301) 657-9400 Bethesda, MD 20815www.meditchmurphey.com Power Generation 9.5 kW Photovoltaic array Goal: 100% of annual electricity needs 49 panels on the roof Two inverters in the basement Grid tied : power grid is our storage system Solar Hot Water system Goal: 85% of hot water needs 2 flat panel panels on roof (tubes another option) 120 gallon pre-heat tank in basement

23 Meditch Murphey Architects 6900 Wisconsin Ave – Suite 500phone: (301) 657-9400 Bethesda, MD 20815www.meditchmurphey.com Energy Balance Zero was our goal, but dont have to go that far to save money and the environment. High efficiency envelope, HVAC and appliances cuts demand to manageable level. Cut usage first before buying more PV panels. Knowing when to stop – the better it is, the harder it is to improve.

24 Meditch Murphey Architects 6900 Wisconsin Ave – Suite 500phone: (301) 657-9400 Bethesda, MD 20815www.meditchmurphey.com Water Efficiency No irrigation system required. Plants are drought tolerant. Low-flow fixtures 1.75 gpm shower head 1.5 gpm lavatory faucets 1.1 gallon per flush toilets Clothes Washer – Water Factor 5.5 Recirculation pump – water recirculated to tank until desired temperature is reached. Fixture-by-fixture graywater reuse – had to delete because of county permit trouble. Still considering rainwater harvesting AQUS system from AquaPro Solutions s s s Motion Sensor Hot water heater Motion Sensor warm water recirculates in cold water line RECIRCULATION PUMP sink tub shower

25 Meditch Murphey Architects 6900 Wisconsin Ave – Suite 500phone: (301) 657-9400 Bethesda, MD 20815www.meditchmurphey.com Finish Materials – Sustainability LEED Recognizes following materials as environmentally preferred: FSC Certified (Forrest Stewardship Council) Recycled (including rubber) Reclaimed Local Rapidly Renewable (bamboo, linoleum) Low VOC (Volatile Organic Compounds). No urea-formaldehyde No exotic woods Durability – more about how and where materials are installed than materials themselves. Ray Amos – New Oxford Studios

26 Meditch Murphey Architects 6900 Wisconsin Ave – Suite 500phone: (301) 657-9400 Bethesda, MD 20815www.meditchmurphey.com Finish Materials on Our project No added urea- formaldehyde in anything Low VOC paints, sealants, adhesives. Hard-floors instead of Carpet FSC / reclaimed / local Hardwoods Engineered wood Linoleum Rubber Cabinets FSC / reclaimed / local woods NOT planned FSC framing or trim Window / Door framing – hard to get.

27 Meditch Murphey Architects 6900 Wisconsin Ave – Suite 500phone: (301) 657-9400 Bethesda, MD 20815www.meditchmurphey.com Landscaping Keeping rainwater on-site Nearly 100% Pervious surfaces. Light colored surfaces to reduce heat island effect Rainwater harvesting (still being considered) Bioswales (not planned) Green Roof (planned as an OPTION)

28 Meditch Murphey Architects 6900 Wisconsin Ave – Suite 500phone: (301) 657-9400 Bethesda, MD 20815www.meditchmurphey.com Landscaping Shading the House (but not the panels) Saving potable water 100% Drought tolerant High-efficiency irrigation system (we need NO irrigation system) Native Species Only Protecting house No materials that attract termites within 2 ft. of house. Minimize site disturbance, add plantings to eliminate erosion.

29 Meditch Murphey Architects 6900 Wisconsin Ave – Suite 500phone: (301) 657-9400 Bethesda, MD 20815www.meditchmurphey.com Cost Advantages of Green Building Basically prepaying your energy bills for next 25 years. Its (relatively) inflation- proof Its deductible Comfort Sustainable materials are healthier for you and your family to live with. Tight, energy-efficient construction is more comfortable to live in (when properly designed). Grants and Tax Rebates Federal State Local Cooperatives offer additional discounts. http://www.dsireusa.org/

30 Meditch Murphey Architects 6900 Wisconsin Ave – Suite 500phone: (301) 657-9400 Bethesda, MD 20815www.meditchmurphey.com ROI on Green Building One Example $11,900 added cost $1000 added mortgage payments per YEAR $1,900 utility savings per year About $900 / year ROI Near net-zero house in Massachusetts courtesy Steven Winters Associates

31 Meditch Murphey Architects 6900 Wisconsin Ave – Suite 500phone: (301) 657-9400 Bethesda, MD 20815www.meditchmurphey.com LEED-H Administered by U.S. Green Building Council (USGBC). Considered by many to be the de-facto standard for green home construction LEED-H is administered by approved network of Green Raters. Other standards exist EnergyStar (U.S. EPA) NAHB (National Association of Home Builders). Others?

32 Meditch Murphey Architects 6900 Wisconsin Ave – Suite 500phone: (301) 657-9400 Bethesda, MD 20815www.meditchmurphey.com LEED-H – Cost trade-offs Bragging rights Marketing tool for sale / resale Can definitely add to cost, may save money in long run. Really depends. Point system seems odd at times: Skewed in places : same points for shoe rack as for all FSC framing. No-irrigation landscape earns less points than high-efficiency irrigation system. Tends to suppress innovation. Zero-energy design not rewarded.

33 Meditch Murphey Architects 6900 Wisconsin Ave – Suite 500phone: (301) 657-9400 Bethesda, MD 20815www.meditchmurphey.com LEED-H – Our score Going for PLATINUM (102.5 points), might settle for GOLD.

34 Meditch Murphey Architects 6900 Wisconsin Ave – Suite 500phone: (301) 657-9400 Bethesda, MD 20815www.meditchmurphey.com Summary – the Fundamentals Site selection Energy efficiency Water efficiency Sustainable materials Recycled Reclaimed Local Certified Demolition and construction waste management.

35 Meditch Murphey Architects 6900 Wisconsin Ave – Suite 500phone: (301) 657-9400 Bethesda, MD 20815www.meditchmurphey.com Summary Have to decide whats important to you. Setting priorities and limits. Synergy and Holistic design – Look for opportunities to achieve multiple goals with one solution. Explore LEED but be open to other options too. You want something that you will love and which will enrich the community. This is why Architects are especially important. The Zero Energy House Project embodies all these principles and is at frontier of market-rate speculative house construction. Webcam image April 13, 2009 8:21 AM Making Progress

36 Meditch Murphey Architects 6900 Wisconsin Ave – Suite 500phone: (301) 657-9400 Bethesda, MD 20815www.meditchmurphey.com Shameless Plug For more information, visit our website at www.meditchmurphy.com If you are looking for a good and green architect for New construction Additions Renovations CALL Meditch Murphey Architects @ (301) 657-9400.


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