Passive House

Urban Olympic reboot

We've been investigating what the Urban Olympic project would look like as an 27 unit apartment building.  One potentially excited twist on the building is that we have split the bulk into two volumes with a 18' wide courtyard atrium.  The atrium and circulation are exterior, so we can apply another 2000 S.F.for an extra 3 units and still come in under the FAR limit.

We also did a first run at some energy modeling, using Archicad's EcoDesigner program, and feel that given the bulk it would be fairly straight forward to achieve the Passive House standard, but the return on investment is better if we design to the envelop to Washington State Energy Code, add solar hot water, switch the lighting to LEDs, and add an ERV.

 

Future Shack 2011

Join us tonight at Future Shack 2011 for another evening of great dialogue about houses.  Last year I participated in the 'Speed-Date'---seven minutes to lay out the project and have a design brainstorm, then on to the next architect.  It was a blast, and this year Tim will be sitting in for me. After Speed Date Design, there will be a presentation of innovative ideas in housing.

Our entry, Urban Olympic, is a nine unit townhouse complex designed to use 90% less energy that typical code compliance housing.  See our entries over the last few years : 2011, 2009

It is at Fisher Pavillion in the Seattle Center, starting at 5 pm.

Alternate views of the Passive House conference in Olympia, March 18

Stefan and I attended a conference put on by Passive House Northwest at Evergreen State College on Friday and I feel like we got a bit more of the nuance of the standard, understanding of more of the nerdy building science, as well as a chance to look at first hand some of new projects being brought to the US market. A little more background: Passive House is a concept developed by the PassiveHaus Institute in Germany.  They developed the tools that are used to model performance, and do the training and certification of Passive House consultants.  While there are about 30,000 PH projects worldwide, the US rollout has led to a few complications.

First, within the name, there are two inherent misconceptions:  that they are passive solar houses, and that it is a strategy for houses (since the direct german translation for haus would be 'building' , it's easy to overlook the impact on larger institutional and commercial projects).

Second, the Passive House standard was developed in Germany, and there are concerns that it doesn't address other climates.  In very cold climates, for example, the PH standard would call for an impractical amount of insulation, while in hotter areas, a code compliant house with an interior air seal might make the cut.

Third, the software is a black box, and as one conference goer pointed out, the Northwest is home to a lot of DIY building science 'rogues' who want to see into the box, fiddle and tweak the system to optimize it for our climate. It's a bit of a culture clash manifesting itself in the black box/open source conversation. Plus it is proprietary, so I feel a little bit of the same resistance I have to LEED and the USGBC.

Fourth, the spent energy metric is based on an area measurement.  Since the US first adopters are building houses, and on the small side, the bar is pretty high because the same energy hogs populate big and small homes alike.  Joe Giampetro has recently finished his 'Mini-B' passive house--essentially a small DADU, so it can be done, but there is no inherent reward for building not so big.

The flip side of the argument would be that we shouldn't be building single family detached at all.  Urban Olympic, our multifamily Passive House, seen in the prior post, will be an excellent data point to compare how the overall size of the building affects the energy model's performance and cost of construction.

All in all, if you are a building science nerd, I'd recommend the next event, scheduled for June 17th.  Regardless of your commitment to green building, the underlying idea is powerful, and will have a big impact on the industry over the next 20 years.

On the Boards: Urban Olympic Passive House

Urban Olympic multifamily Passive House Urban Olympic is a community of 9 townhouses, and will  mark a couple of firsts for us:  our first Passive House project and also our first project under the new Seattle multifamily code.

Passive House is a rigorous green building standard focused on exclusively on energy consumption, energy efficiency and air quality. They are super insulated, almost airtight, and therefore need very little energy input to heat (up to a 90% reduction of the energy used by a typical code compliant house).  The heat from equipment, people and lighting retained within the insulated building envelope essentially replaces the furnace/boiler as the primary heat source. Fresh air is conditioned through a Heat Recovery Ventilator (HRV) with the exhausted air.  Although solar gain does factor into the equation, Passive Houses are not passive solar houses.

Urban Olympic, to my knowledge, will be the first multifamily Passive House in the United States.