Forum discussion

NZE v. ZNE

This might be going down a rabbit hole, but in moving to California this year I noticed that "zero net energy" (ZNE) is the standard term, whereas "net zero energy" (NZE) was more common back east. The DOE's 2015 definition (below) uses "zero energy building" (ZEB), which to me implies a building uses no energy at all.

Regional differences in terminology present an interesting challenge for firms practicing nationally. Hoagie, sub, or grinder...?

Thoughts on this, anyone?

https://energy.gov/eere/buildings/articles/doe-releases-common-definition-zero-energy-buildings-campuses-and

‘A basic issue that needed to be established is what to call buildings that are designed and operated in such a way that energy consumption is reduced to a level that it is balanced by renewable energy production over a typical one-year period. To make the determination, the Project Team reviewed definitions already in use; collected opinions of SME and Stakeholders; and considered other DOE programs and goals. In addition, a key factor came from the DOE Zero Energy Ready Homes program which had received feedback that concluded the term “net” was confusing to consumers. The desire was to have a term that resonated with building owners. The Project Team considered an idea advanced by some that “net” is necessary to be accurate in accounting for energy usage. The team reached the conclusion that the word “net” did not add substantive meaning to the name, since the definition fully describes how to account for delivered and exported energy. Therefore, in striving for simplicity, consistency and to accentuate the core objective, DOE and NIBS selected the term “Zero Energy Building (ZEB).” However, it is recognized that the terms Net Zero Energy (NZE) and Zero Net Energy (ZNE) are in wide use and convey the same meaning as Zero Energy.’

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Wed, 12/20/2017 - 17:55

Hoagie (zero source mayo) -Stephen

Wed, 12/20/2017 - 17:56

I’m a NZE gal myself but I speak fluent ZNE and ZEB. Thank you, Anica ANICA LANDRENEAU Associate AIA, LEED® AP BD+C, WELL AP Senior Principal | Director of Sustainable Design HOK anica.landreneau@hok.com t +1 202 944 1490 m +1 202 250 1779 Canal House, 3223 Grace Street, N.W. | Washington, DC 20007 US hok.com | connect Fr

Wed, 12/20/2017 - 18:01

I know that this is the source of much dorky humor at NBI/RMI’s Getting to Zero conference each year. Indeed it is a “pop” or “soda” kind of issue. Brad Jacobson Associate Principal d 415-321-6330 ehdd. From: Lan

Tue, 01/02/2018 - 16:17

I had started a thread on my concerns about referring to buildings that use energy from any source as "zero energy buildings" a few months ago.  I felt, and still feel, that it is a terrible idea.  If a building uses energy, even from a renewable source, it is not zero energy and we should not label it as such.  I am slightly more comfortable with "net zero", although agree that it requires explanation for those that aren't in the industry (and even for many who are).  I lean towards more mainstream language such as "hybrid renewable" and "100% renewable", which most people would already understand and are more accurate descriptors of the energy source(s) for a given building.  As in the thread I started, I am keenly interested in others' opinions on this topic.  I think the messaging coming out of the green community is so important to the overall success of our efforts.    

Tue, 01/02/2018 - 16:43

Bryna, I agree. Renewable energy is still energy so Zero Energy Buildings is not correct even in those cases. They may not receive energy from an outside source, but energy is energy. I personally don't see anything wrong with NZE as it at least indicates a balance happening. On the flip side, if we could just get to producing more energy than is needed, making everything a Net Positive Energy building bypasses the need for any of these other terms...

Tue, 01/02/2018 - 17:35

Thanks for weighing in. As noted below, I agree that “zero energy” is misleading. But my real question was simpler: if you practice across various regions, how does your firm handle the NZE v ZNE question in general literature (website, published articles, marketing collateral, speaking engagements, etc.)? Admittedly this is a question of logistics and isn’t as important as the larger issue. Personally, I’m not comfortable with “net positive” for a number of reasons, in large part because it’s being applied to more than just energy. There is no such thing as a building whose impact is positive in all the ways our industry has been claiming. (Our long-standing debate about whether materials can be “healthy” is a good example.) That aside, even when focused exclusively on energy, we’re misleading when we claim a building is “net positive.” As far as I’m aware, most buildings for which this is claimed do draw from the grid on occasion, but they make up for it over the course of that year with renewables. While the total amount of energy produced on site might exceed the total required to operate the building in a given year, it still draws from the grid, and there’s a negative impact to that, especially if the grid is powered by fossil fuels. The net result of the renewables doesn’t negate the result of the periods when the grid is being used, so there’s still a harmful effect in that case, no? Then there’s the question of over-emphasizing energy alone; any building can become “net positive” or “net zero” if enough renewables are used. So when renewables become more readily available and cheaper than other sources, do we merely deploy a whole bunch of them and call it a day? There’s an argument that the embodied energy of materials used to make a building exceeds the energy used to power most buildings, so the total equation for a “net positive” building with high-impact materials exotically sourced could be significantly more harmful than a conventional building with low-impact materials locally sourced. Regardless, I totally agree with Bryna: “the messaging coming out of the green community is so important to the overall success of our efforts.” We need better language to address all of this comprehensively. Ideally that language would at least hint at the complexities of all of this. I mean, the fundamental lesson of ecology is that all things are connected, while the language we use to address this tends to isolate these issues: energy, water, materials, etc. From: Robert Phinney [mailto:no-reply@buildinggreen

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