PHEV (Plug-in Hybrid Electric Vehicle)

Confluence already uses an electric car for site visits in the valley; 2013 Nissan Leaf.

But it won’t make it to our HERS Rating inspections and blower door tests in Telluride, Mountain Village, Steamboat, Vail Valley and Summit County.

So we have added a PHEV (Plug-in Hybrid Electric Vehicle) to the “fleet”.

A 2018 Toyota Prius Prime…

2018 Prius Prime

2018 Prius Prime

Some features…

  • Hybrid Synergy Drive with Electronically controlled Continuously Variable Transmission
  • 55 city/53 highway MPG
  • 133 MPGe
  • 640-mile EPA-estimated total driving range
  • 25-mile EPA-estimated EV Mode driving range

 

Energy & Sustainability Services

Recently more jurisdictions have adopted the 2015 IECC or the IgCC and we have been helping several architects & designers with energy and sustainability code compliance.

Go custom! You don’t have to follow the recipe. Make the energy code work for your project.

Farm out the energy work to Confluence. We will be responsible for any or all of these, bring value to the performance of the building, and take the load off of your hands:

  • Energy code compliance
    • Infiltration (blower door) testing
    • Assembly UA trade-off (calculation software)
    • Total UA trade-off (REScheck or HERS Rating)
    • Performance path compliance (REScheck or HERS Rating)
    • ERI path compliance (HERS Rating)
  • Code compliance/optimization and Construction Documents
    • Ventilation calculations
    • Sealed crawlspace & ventilation details
    • Continuous Insulation details
    • Back-ventilating siding and attachment details
    • Efficient framing details
    • Fenestration flashing details
    • Radon mitigation details
    • Thermal and pressure envelope delineation
    • Vapor retarder specifications
    • Air-sealing details
  • Local/municipal Green/Efficient Building Checklists
    • Carbondale, Basalt, Town of Snowmass Village, Telluride, Mountain Village
  • Above-code/Net Zero design and certification
    • LEED, Passive House, HERS Rating, etc.

Very Large Residential and Commercial Infiltration Tests

Confluence can perform very large residential and commercial infiltration tests, or blower door tests.

H4H-ReStore

We set up eight fans in three doorways for this test at Habitat For Humanity’s new ReStore warehouse In Glenwood Springs, Colorado. Although, not the biggest test we have conducted. That honor goes to a 56,000 square foot house built for a Saudi Arabian Prince in the Starwood neighborhood near Aspen, Colorado.

Starwood

 

Recent work…

We have recently gotten the chance to photograph some recently completed work.

The Basler Residence at Elk Springs, Garfield County, Colorado…

 

And this storage banquette…

Here’s a house going up in Oak Meadows…

 

 

How much solar do I need to power an Electric Vehicle?

Nissan Leaf

I don’t understand MPGe. A better metric would get me closer to knowing what I really want to know; how much does it electricity does it take to charge my car’s batteries? How far will that get me? What does it cost? How much solar do I need to offset the power consumption of an EV?

We’ve been driving our 2013 Nissan Leaf for one and a half years now and I have some data… the metric that makes the most sense to me is miles/Kwh. We live in a climate that is less than perfect for electric cars; little too hot in the summer, little too cold in the winter and lots of mountains. But still we average 4.5 miles/Kwh annually. I can’t find much difference in efficiency between the different makes and models of EVs. It seems to have much more to do with your climate, geography, topography, and a driver’s tendency to show passengers how fast an electric car will take off from a start. In 2016 we drove 12,108 miles. Assuming 4.5 miles/Kwh, then 2,691 Kwh went into powering the car.

Our solar array is officially rated at 3,240 watts. It was predicted to make us 4,753 Kwh annually, but in 2016 it gave us only 4,000 Kwh (16% less than estimated). The solar guys say this is because their software doesn’t de-rate for “losses” like; snow on the panels, age, azimuth and orientation. Sounds like a weak excuse to me; regardless, 4,000 Kwh is what we get.

The solar panels made enough power to push the car 4,000 x 4.5 = 18,000 miles. Each one of our twelve panels made us 1,500 miles worth of driving electricity. We drove only 12,108 miles, so the rest went into powering the house. To zero-out our total electric consumption, we would need to make a total of about 8,000 Kwh of power, or have a 6,500 system. 2,700 Kwh for our 12,000 miles of driving (34%) and 5400 Kwh for the house (66%).

So, how much solar do you need to offset your drive. Impossible to calculate for sure, but here’s starting point…  wattage of PV array required = (miles driven annually / 4.5 miles/Kwh) X .8  If you have a lead foot, get a couple more panels.

If we bought the electricity to drive the car 12,108 miles (2,691 Kwh x $.138) it would have cost $371. It would cost me about $1,000 for the gas to drive our 2005 Subaru Outback the same distance. Solar is good when offset your home electric uses, but when it keeps you from buying gas- it pays back three times faster! And don’t get me started on maintenance and repairs; oil changes, transmission oil, power-steering fluid,  fan belts, timing belts, head gaskets, catalytic converters, mufflers, oil filters, air filters, fuel filters, hoses, plugs, tubes, valves, sensors, etc. EV’s still have/need; insurance, tires, shocks, air conditioners, windshield wipers, windshield washer fluid, brakes and brake fluid. But I really don’t miss the regular stops at the gas and oil change stations and repair shops. If you have the means and it fits your commuting- buy one! You’ll love it.

Couple creates a deep-green, DIY home in Satank, Colorado

This is a re-posting of an article from Roaring Fork Lifestyles magazine.

Link…

Check this Tumbler scrapbook about the construction process, very interesting.

Link…

Confluence Architecture & Sustainability was the HERS raters for this home. The HERS is an outstanding -10! The negative means is actually beyond net-zero, it is net-positive. As in, the occupants of this home should never have to pay for heating, cooling, lighting or hot water. Attention to detail got this house crazy air tight. Even with salvaged windows and doors, Steven was able to get this down to .69 ACH50. I’m sure it would have bested Passive House requirements (.6 ACH50) if not for the less-than perfect windows and doors.

Congratulations Steven and Bailey- you have a beautiful, high-quality home. Here are a few teaser photos…

The "Hainestead"

 

 

Confluence Architecture’s Design Process

Predesign

Typically, the process begins with walking the site and talking about the vision for the structure. If it is an undeveloped lot, we often identify the ”power spot”, a point on the site that relates the conceptual center to the design. The program is developed, that is the recipe of spaces and requirements for the house.

 

Schematic Design

The first schematic sketches are based on; site forces like the sun, views, trees. Civil issues like vehicular access, topography, and drainage. Tangible issues like program, size, and scale. Local vernacular. Confluence typically develops several schematic designs for residential projects.  The diagrams take the form of two dimensional plans and three-dimensional massing models.

Example of schematic site plan

Examples of schematic massing model

Design Development

During design development, the multiple design directions studied in schematic design coalesce into one design direction.  The 2-D plans and 3-D model are developed with more detail showing fenestration and exposed structure.

Example of design development plan

Examples of design development models

Construction Documents

During the Construction Documents phase, the details and materiality of the design are created.  These documents are used for building department, HOA approval, and ultimately to build the home.

Construction Documents

Beyond Construction Documents

On occasion, a project needs more description beyond construction documents.  Confluence can do fully rendered models for sales and advertising, interior drawings and details and more.

Marble Distillery Inn – rendering of hotel room

Photo of hotel room

 

Marble Distillery Inn – rendering of tasting room

Photo of tasting room

Sustainability

We are committed to keeping up with the state of the art in energy efficient and sustainable construction. Our construction documents will include details for building in an air-tight and durable manner.

Generic energy modeling verses HERS Ratings

What is energy modeling and why would I want it?

Basically, energy modeling software creates a mathematical simulation of your building over time to estimate how much it will cost to operate. It figures out how much heat is lost through every square foot of the envelope and how much heat is gained by the sun shining through the windows every year. It uses historical weather and solar data to calculate how much heat you will need to put into or remove to keep the indoor environment comfortable. And it can put this data in terms of dollars spent on fuel and utilities.

What’s the point? Optimization. We can swap different windows, adjust overhangs, try differing amounts of insulation, etc. and see what the result to the loads are, so we can find the sweet spot for your particular building. Knowing how much it costs to operate your building will allow you to calculate a return on investment for monies spent on energy conservation upgrades. For example, solar will pay for itself in the long run, but what is the payback period 5 years? 10 years? 20 years? Is it better to add continuous exterior insulation or buy better windows? Is it more cost-effective to add insulation to the attic or buy a few more solar panels?

HERS Rating

So what is a HERS Rating?

The RESNET HERS Rating protocol is a nationally standardized energy modeling system, just for houses, that lets us get to the answers relatively quickly and makes results consistent and comparable across the country.

The value of a HERS Rating over just energy modeling comes in four ways.

  1. Code compliance- HERS Ratings supersede the rigid rules of the energy code and gives you flexibility.
  2. Third-party inspections- we inspect at rough to look for problems with air barriers and insulation. Having an air-tight envelope not only saves energy, it helps prevents rodents, bugs and dust from getting into the house. We grade insulation on the quality of its installation. If we find less than perfect installation, we bring it to the attention of your GC and he can have it corrected before it is too late.
  3. Rebates- many rebates are only available to those that receive a HERS Rating.
  4. Resale- the score goes on the MLS report so buyers get a sense of how efficient the house can be (like a MPG sticker for a car). Embedding the value of energy features in the value of the home also makes it easier to invest in features that have a longer return on investment.

 

What energy modeling doesn’t do…

  1. The model doesn’t know how much anything costs, except gas and electric. So it will not do a cost benefit analysis without help from the rest of your team.
  2. It is not the same kind of zoned load calculations used by HVAC designers to size ductwork or radiant tubing layouts. You will still need a heat/cooling/ventilation distribution design. It will tell us how many kBtu the furnace or boiler should produce, but not how to get the right amount of heat to every corner of the house to maintain comfortable temperatures.
  3. It is just an estimate. Occupant factors, like where the thermostat is set, will skew the numbers accordingly.

 

Why choose Confluence Architecture and Sustainability?

The team at Confluence has been practicing architecture in the extreme climate of the mountains of Colorado since the turn of the century. We started offering sustainability services when the 2009 International Energy Conservation Code was adopted. We know how to play with Owners, Architects, Engineers, Builders and Code Officials. We bring our experience to the table on tangential matters like; air barriers, vapor retarders, ventilation rates, indoor air quality, mechanical systems and optional solutions and alternative methods for code compliance. And we can make recommendations to increase the quality, comfort and durability of your structure.

Hers are some other related blogs…

https://www.confluencearchitecture.com/hers-rating-process/

https://www.confluencearchitecture.com/blower-door-test/

https://www.confluencearchitecture.com/preparing-for-your-blower-door-test/

 

2015 IECC Adoption Western Colorado

Here in western Colorado, local jurisdictions are busily adopting the 2015 building code.  The 2015 IECC adoptions are the most contentious and most heavily modified.  It is hard to keep track what needs to be done to comply with the energy requirements for residential construction.  Below is a cheat sheet table of adoptions and modifications in Western Colorado.  If you need assistance getting the most sustainable home or just figuring out what a jurisdiction wants – give Confluence Architecture a call.  How is the 2015 IECC different than 2009?  See this blog. We do HERS ratings, blower door tests, and code compliance documents for the IECC.

Adopted Residential Energy Codes and Amendments
JurisdictionIRCIECCAmendments to CodeHERS RequiredHERS usable for permitBlower Door Required
Garfield County20152009No Amendments to IECCnonono
City of Glenwood Springs20092009No Amendments to IECCnonono
Town of New Castle20032009Requires third party checklist, blower door (7 ACH50), CAS test, and ENERGY STAR appliancesnoyesyes
Town of Silt2009nonone
City of Rifle20092009No Amendments to IECC
Town of Carbondale20092009No Amendments to IECCnoyesmaybe
Pitkin County20152015No Amendments to IECCnoyesyes
Town of Basalt20062015noyesyes
Town of Snowmass Village20152015No Amendments to IECCyesyesyes
City of Aspen20152015IECC -many amendmentsnonono
Eagle County20152015Fenestration U-factor .30 max.noyesyes
Town of Vail20152015R21 on wood framed can be substituted for continuous insulationnoyesyes
Town of Avon20152015all gas fired boilers used for snow melt minimum 92% AFUEnoyesyes
Town of Eagle20122012No Amendments to IECCno
Town of Gypsum2003nononeno
San Miguel County20092009San Miguel County Prescriptive Codeif over 5000 sfyesif over 5000 sf
Town of Telluride20032009Eliminated whole code and replaced with their own that has higher insulation levels, required HERS, blower door, and duct blasting, min. HVAC efficiencies, low flow fixtures, and rough for solaryesyesyes
Town of Mountain Village (Telluride)20122012HERS rating required, mechanical engineering required, permit fee reduced for good HERS or low exterior energy useyesyesyes