meditch murphey architects a1 sofeh co. isfahan, iran, tel: (311)663 9087, fax:(311)663 9088, ...
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Meditch Murphey Architects A1 Sofeh Co. Isfahan, IRAN, Tel: (311)663 9087, Fax:(311)663 9088, www.a1sofeh.com
Designing the Zero Energy House
NetZEB Concepts
A1 Sofeh Work Shop for SABA Seminar 21/02/1392
Meditch Murphey Architects A1 Sofeh Co. Isfahan, IRAN, Tel: (311)663 9087, Fax:(311)663 9088, www.a1sofeh.com
Who We Are
► Eyvan Sofeh Co.
Internationl Design, Construction & Development
► We Do:
► Engineering
► Procurement
► Construction
► Management
► Financing
Meditch Murphey Architects A1 Sofeh Co. Isfahan, IRAN, Tel: (311)663 9087, Fax:(311)663 9088, www.a1sofeh.com
What IS NetZEB?
► Goal : House is designed to produce as much energy (Renewable) as it consumes on yearly basis.
► The power grid is our storage system. The surplus of energy produced in low peak time is to be transferred to the Grid
► Reduction on Energy Consumption is the first priority. This purpose can be achieved through Passive Energy Home Design
Meditch Murphey Architects A1 Sofeh Co. Isfahan, IRAN, Tel: (311)663 9087, Fax:(311)663 9088, www.a1sofeh.com
Our Motivation
► To prove that a NetZEB, market-viable speculative house is possible.• Cost competitive• Beautiful• Sustainable
► Because energy independence and health Natural Environment is important.
► Because Energy Resources are limited and should be saved as well for next generations
► Because reduces Energy bills amount for home owners
Meditch Murphey Architects A1 Sofeh Co. Isfahan, IRAN, Tel: (311)663 9087, Fax:(311)663 9088, www.a1sofeh.com
► Highly Insulated, Tightly Sealed Envelope
► High Efficiency Mechanical System
► High-Efficiency Appliances
► Taking Advantage of Free renewable Energies for Heat, Cool, and Electricity
How to achieveNetZEB
Meditch Murphey Architects A1 Sofeh Co. Isfahan, IRAN, Tel: (311)663 9087, Fax:(311)663 9088, www.a1sofeh.com
Beyond NetZEB
► 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
Meditch Murphey Architects A1 Sofeh Co. Isfahan, IRAN, Tel: (311)663 9087, Fax:(311)663 9088, www.a1sofeh.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
Meditch Murphey Architects A1 Sofeh Co. Isfahan, IRAN, Tel: (311)663 9087, Fax:(311)663 9088, www.a1sofeh.com
The Architectural Design
(Example)
► Comfort
► Aesthetics
► Efficiency
► Sustainability
► Cost
► Context
Kitchen viewed from Dining RoomFront of house with entry and pergola.First floor
Second floorLiving room & Dining room viewed from Kitchen
Solar array
Meditch Murphey Architects A1 Sofeh Co. Isfahan, IRAN, Tel: (311)663 9087, Fax:(311)663 9088, www.a1sofeh.com
Site Selection(Example)
► Infill vs. Virgin Territory
► Public Amenities• Transportation
29
T2
3232
1/4 mi1/4 mi 1/2 mi1/2 mi
Meditch Murphey Architects A1 Sofeh Co. Isfahan, IRAN, Tel: (311)663 9087, Fax:(311)663 9088, www.a1sofeh.com
Site Selection (Example)
► Infill vs. Virgin Territory
► Public Amenities• Transportation• Community Services• Greenspace
PARK
CLUBHOUSE
Meditch Murphey Architects A1 Sofeh Co. Isfahan, IRAN, Tel: (311)663 9087, Fax:(311)663 9088, www.a1sofeh.com
Site Selection (Example)
► Infill vs. Virgin Territory
► Public Amenities• Transportation• Greenspace• Community Services
► House Orientation for optimum solar income:• Passive solar design• Solar hot-water and
Electricity.
Meditch Murphey Architects A1 Sofeh Co. Isfahan, IRAN, Tel: (311)663 9087, Fax:(311)663 9088, www.a1sofeh.com
Envelope – Insulation
► The cheapest energy to buy is the energy you don’t 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
Meditch Murphey Architects A1 Sofeh Co. Isfahan, IRAN, Tel: (311)663 9087, Fax:(311)663 9088, www.a1sofeh.com
Envelope – Windows
► Windows/Doors • U-factor = 0.32 (R3)• Solar Heat Gain Coeff.
(SHGC) = 0.28
Meditch Murphey Architects A1 Sofeh Co. Isfahan, IRAN, Tel: (311)663 9087, Fax:(311)663 9088, www.a1sofeh.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
Meditch Murphey Architects A1 Sofeh Co. Isfahan, IRAN, Tel: (311)663 9087, Fax:(311)663 9088, www.a1sofeh.com
Envelope – Windows
EAST
WEST
NORTH
SOUTH
Limit East and West facing GlassAt least 50% more glass on North and South than on East and West.
Meditch Murphey Architects A1 Sofeh Co. Isfahan, IRAN, Tel: (311)663 9087, Fax:(311)663 9088, www.a1sofeh.com
Passive Mechanical Systems –
Nature’s 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.
Meditch Murphey Architects A1 Sofeh Co. Isfahan, IRAN, Tel: (311)663 9087, Fax:(311)663 9088, www.a1sofeh.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
Meditch Murphey Architects A1 Sofeh Co. Isfahan, IRAN, Tel: (311)663 9087, Fax:(311)663 9088, www.a1sofeh.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
Meditch Murphey Architects A1 Sofeh Co. Isfahan, IRAN, Tel: (311)663 9087, Fax:(311)663 9088, www.a1sofeh.com
Power Generation(Example)
► 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
Meditch Murphey Architects A1 Sofeh Co. Isfahan, IRAN, Tel: (311)663 9087, Fax:(311)663 9088, www.a1sofeh.com
Energy Balance
► Achieving Zero Energy is the goal, but don’t 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.
Meditch Murphey Architects A1 Sofeh Co. Isfahan, IRAN, Tel: (311)663 9087, Fax:(311)663 9088, www.a1sofeh.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
s s sMotion Sensor
Hot
Motion Sensor Motion Sensor
UMP
sink
sink
tub
shower
Meditch Murphey Architects A1 Sofeh Co. Isfahan, IRAN, Tel: (311)663 9087, Fax:(311)663 9088, www.a1sofeh.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.
Meditch Murphey Architects A1 Sofeh Co. Isfahan, IRAN, Tel: (311)663 9087, Fax:(311)663 9088, www.a1sofeh.com
Finish Materials on the Example 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
► Framing FSC framing or trim • Window / Door framing –
hard to get.
Meditch Murphey Architects A1 Sofeh Co. Isfahan, IRAN, Tel: (311)663 9087, Fax:(311)663 9088, www.a1sofeh.com
Landscaping (Example)
► Keeping rainwater on-site• Nearly 100% Pervious
surfaces.• Light colored surfaces
to reduce heat island effect
• Rainwater harvesting • Green Roof (OPTION)
Meditch Murphey Architects A1 Sofeh Co. Isfahan, IRAN, Tel: (311)663 9087, Fax:(311)663 9088, www.a1sofeh.com
Landscaping(Example)
► Shading the House (but not the panels)
► Saving potable water• 100% Drought tolerant• High-efficiency
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.
Meditch Murphey Architects A1 Sofeh Co. Isfahan, IRAN, Tel: (311)663 9087, Fax:(311)663 9088, www.a1sofeh.com
Cost Advantages of Green Building
(Example)
► Basically prepaying your energy bills for next 25 years.• It’s (relatively) inflation-
proof• It’s 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 in Europe , USA and Canada
► Additional Discounts on Energy Efficient appliances (from Manufacturers), Not in Iran
Meditch Murphey Architects A1 Sofeh Co. Isfahan, IRAN, Tel: (311)663 9087, Fax:(311)663 9088, www.a1sofeh.com
ROI on Green Building(Example)
► One Example• $11,900 added cost• $1000 added mortgage
payments per YEAR• $1,900 utility savings per
year• About $900 / year ROI
Example project for NetZEB
Meditch Murphey Architects A1 Sofeh Co. Isfahan, IRAN, Tel: (311)663 9087, Fax:(311)663 9088, www.a1sofeh.com
LEED and other standards
► 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?
Meditch Murphey Architects A1 Sofeh Co. Isfahan, IRAN, Tel: (311)663 9087, Fax:(311)663 9088, www.a1sofeh.com
Summary – the Fundamentals
► Site selection
► Energy efficiency
► Water efficiency
► Sustainable materials• Recycled• Reclaimed• Local• Certified
► Demolition and construction waste management.
Meditch Murphey Architects A1 Sofeh Co. Isfahan, IRAN, Tel: (311)663 9087, Fax:(311)663 9088, www.a1sofeh.com
Summary
► Have to decide what’s 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