Passive Houses Get Good Graphic Explanation


New York Times

The New York Times has a great graphic explanation of the principles of the Passive House, "airtight buildings that use heat from appliances and even the occupants' bodies for warmth." The Times notes that while they are popular in Germany and Scandinavia, they have not caught on in the US, where it seems that the "green gizmo" approach of adding photovoltaics and heat pumps rules over simplicity and efficiency. (and, admittedly, air conditioning is a bit more common)


Passive House, Voralberg, Austria, Passive House Institute

But it makes a lot of sense to design a house that doesn't need a lot of technology. The Passive House idea is really simple:

1. Insulate it. Like 12 inches of the stuff in the walls, sixteen inches in the roof, six inches under the slab.

2. Site it well, to get passive solar gain. Design the overhangs and trellises to stop solar gain in summer.

3. Keep the design relatively small, simple and tight, minimizing exterior area and complicating jogs.

4. Install a heat recovery ventilation system to provide constant fresh air; you are going to need it in a house that is so well sealed.


New York Times

The New York Times describes a heat recovery wheel heat exchanger; others work on a labyrinth principle with no moving wheel, but a heat exchanger. In warmer climates one might use an enthalpy wheel, which transfers moisture as well as heat.


Smith House, Passive House Institute

As I noted in our discussion of the Smith House by Katrin Klingenberg in Urbana, Illinois,

So how simple is that? a tight, efficient plan + careful siting to max out the passive solar + lots of insulation gives you an almost zero energy house. This ain't rocket science, it is just good design.

More on Passive Houses in TreeHugger:
Passivhaus in the New York Times
The Third Industrial Revolution
A Passiv Haus in Urbana, Illinois
Denmark Debuts First Certified Passive House

More in Planet Green on passive design and low tech solutions:

Low-Tech Tips: Tune Your Windows

Low-tech Tips: Get the Roof Overhangs Right

Low-tech Tips: Keep Cool with Awnings

Get a Heat Recovery Ventilator if You Seal Your House Up Tight

More detail at Green Building Advisor
and at the Passive House Institute

Tags: Housing Industry | passive house