Passive House Institute to Include Renewable Energy in New Ratings

The Passive House Institute has announced [PDF] that it will start rating buildings that produce renewable energy while meeting the clearly defined Passive House Standard. In order to do this, PHI had to reexamine the calculations for primary energy. PHI uses the term primary energy to refer to what the US EPA calls source energy which you may be familiar with for Energy Star ratings. I’ll use PHI’s terminology in this post. See the Energy Star Portfolio Manager Technical Reference [PDF] for national source energy ratios for the US and Canada. These ratios depend on the mix of electricity generation. EPA chose to use national averages instead of local or electrical grid ratios. The choice of a “correct” primary energy ratio is complicated and not apolitical. For example, some people may disagree that burning coal on site is equivalent to onsite PV (both have primary energy ratios of 1.0 per EPA).  And the ratios are constantly changing. When designing buildings that will last decades, should we use past primary energy ratios or future forecasts? These choices only get more complicated as renewable energy becomes a larger fraction of the electric grid because wind and sunlight are intermittent, requiring energy storage.

PV panels on vegetated roof of Etrium Passive House office building near Cologne. Photo by Greg Duncan

Solar panels on vegetated roof of Etrium Passive House office building near Cologne. Photo: Greg Duncan

Current definitions of Net Zero Energy Buildings—there are at least four—ignore the energy storage and transmission requirements due to renewable energy produced on site. Different uses of energy have different requirements for storage and transmission. Because of these problems, PHI is replacing the primary energy ratio with a new concept, Primary Energy Renewable (PER), that takes into account storage losses as well as production and distribution losses. For example, onsite PV can power air conditioners during summer days when there is plenty of sun, so there is no need for storage and the PER is lower. Conversely, PV systems are not particularly ideal for heating. The PER for heating with electricity—ideally with an air source heat pump instead of direct resistance—is therefore higher. In the future, it will be much more environmentally sound and cost-effective to use renewable energy to cover energy demand for any cooling that may be needed than for heating. These new application-specific PER ratios are also climate specific, dependent on seasonal solar and wind production potential. [Proceedings of the 18thInternational Passive House Conference, pp 648-9. Aachen, Germany 2014. ISBN 978-3-00-045216-1.]

USAF - 070731-F-8831R-001

Utility-scale solar at Nellis Air Force Base USAF – 070731-F-8831R-001

As you can see just from the examples of heating and cooling, calculation of a Net Zero Energy building is complicated. All of them rely on the building itself as the boundary condition for renewable energy production, although sometimes including parking lots and public rights of way. The Net Zero concept discriminates against tall buildings because it is not feasible to install enough PV or wind turbines to meet the energy demands of a 4+ story building. WNYC has an article on the challenges of going solar in an urban environment and why Passive House should be the basis for the design, in order to reduce energy consumption. The article uses the example of a Net Zero Energy school on Staten Island with the luxury of a more suburban location than most of New York City that will open in 2015. This building uses the “trick” of including PV panels over a parking lot.

P.S. 62, being built on Staten Island's South Shore, will have 2,000 solar panels to generate as much energy as the building uses. (Chris Mossa/WNYC)

P.S. 62, being built on Staten Island’s South Shore, will have 2,000 solar panels to generate as much energy as the building uses. (Chris Mossa/WNYC)

 

To address the discrimination against tall buildings that Net Zero definitions perpetuate, PHI is proposing new classifications based on renewable energy produced on site per lot area rather than floor area:

  • Passive House Classic: unchanged except for the new definition of Primary Energy Renewable. No onsite renewable energy required.
  • Passive House Plus: for a single family house, about as much energy is produced as is consumed.
  • Passive House Premium: for a single family house, produces an energy surplus.

Without changing the Passive House definition, PHI will also start recognizing “Energy Conservation Buildings” that meet a certain threshold for energy efficiency but fall short of meeting the Passive House standard.

2 replies
  1. Nick Grant
    Nick Grant says:

    Nice summary

    I think PHI are trying really hard to come up with a better alternative to the usual Net Zero definitions.

    However I still think it is problematic to include renewables as part of the building energy performance standard.

    One of the things that has made Passivhaus popular in the UK is that many people are fed up with the zero carbon building fiasco.

    Sure we can come up with ever more complicated allowances to work around poor PV sites, tall buildings, lack of budget etc but better to separate building and generation.

    The realisation that electricity used for say DHW or cooling might be satisfied by PV in a way that winter heating cannot be, is a useful refinement. However why limit it to site PV rather than grid renewables which might include wind, large scale PV and other inputs. Designing buildings that reduce peak load and can use renewables when available is a good thing and independent of individual PV installations.

    Also I have a real problem with the names Plus and Premium which imply rather more than some PV on the roof. If I lived in a city I’d rather have a roof garden and let the PV go on industrial sheds. Fine to call it Passivhaus ‘plus PV’.

    I’m not against people putting PV on their buildings if they want to but I am against making this a requirement by regulation or marketing pressures.

    It is hard enough to get buildings designed and built properly without adding additional complications, constraints and expense. The obsession with the arbitrary building boundary is a real distraction.

    Nick

    • duncanadmin
      duncanadmin says:

      Thanks, Nick.

      I agree. I think the Primary Energy Renewable definition provides a way to start thinking about optimizing a building for the consumption of renewable energy, whether it comes from the roof, the parking lot, or an off-shore wind farm. Government and utility policies seem to be shifting towards making residential production and sale of PV less economical through reduced feed-in tariffs and limits or fees on net metering. This makes “self-consumption” more important, and a Passivhaus with low PER would be better suited to take advantage of it. That will be the subject of another blog post.

      Politically, though, it is probably necessary to have an alternative to Net Zero/Zero Carbon. Zero is such a magic number. Invented in North America!

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