The Science of Sustainability

What’s So “Smart” About a Smart Home?

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SmartHome Cleveland

The windows on the SmartHome let in heat during the winter and shade the sun's rays in the summer.

Reduce, reuse, and recycle. We’ve heard it. Some people practice it. But as energy and other natural resources become harder to obtain and conserve, more people are looking toward solutions for a sustainable future. SmartHome Cleveland, first located at the Cleveland Museum of Natural History, was designed to create a vision for some sustainable technologies and practices that are available right now to people who are thinking about building or renovating their homes.

One of the biggest challenges in our country is to conserve our energy supply. Energy, usually starting in the form of natural gas or other fossil fuels, is burned or converted to electricity to supply heating, cooling, illumination, and other household conveniences. It is estimated that an average home wastes about 30% of the energy used for heating and cooling due to poor household insulation. The U. S. Department of Energy estimates an annual cost of about $1,900 per household in lost energy savings. And that doesn’t count the energy we use for lighting, appliances, computers, video games, and many other things we might take for granted.

So, what have the designers of SmartHome Cleveland done to address these and other environmental challenges? They have incorporated a variety of technologies to reduce this home’s heating and cooling demands to about 10% of that required by the average home, and they have reduced the need for primary energy consumption to about 30% of that used in the average home. Let’s take a closer look at some of these technologies and the strategies to employ them.

The first design principle was to create an air-tight system of super insulation. This involved installing an insulated concrete foundation and walls one foot thick that use a combination of synthetic foams and natural cellulose. High-performance triple-pane windows seal in the heat and keep out the cold. Even the joists and beams in the house’s construction were insulated to prevent conduction of the home’s heat to the outside. Even the little bit of heat that would normally escape to the outside is channeled back into the incoming air.

Large windows with a southern exposure are used to allow the sun’s heat energy into the home during the winter. Instead of a furnace, the SmartHome uses the sun’s heat energy and a small, ductless, air-source heat pump to provide winter heating. The inside-outside air exchange in the house is rated at about 0.6 changes per hour. A typical home exchanges its internal air supply with the outside about 3 to 6 times per hour. By comparison, a drafty, poorly-insulated home might be exchanging its complete air system with the outside as much as 20 times per hour! In northeast Ohio, with winters averaging about 30 degrees Fahrenheit, you can calculate that you might have to heat a poorly insulated house 33 times for every 1 time in the SmartHome!

A solar panel array and a storage/conversion system provide the home’s electricity. Enough electricity is generated to power the heating-cooling-ventilation system and the energy-efficient appliances and LED lighting. The large southern windows also provide a special kind of directional shading. In the summer, when the sun is higher in the sky and more heat energy is concentrated in the northern hemisphere, the shading reflects the sun’s rays back toward the outside. The heat pump, insulated walls, and roof also help to maintain a comfortable summer temperature.

Outside the house, the roof, a rain garden, and pervious pavement channels up to 500 gallons of rain water and storm runoff to a storage cistern and irrigation system. This reduces the demand on the city sewer system and provides recycled water used to keep the shade trees, lawn, and garden plants healthy during the hot Ohio summer.

In the end, the Cleveland Museum of Natural History hopes people will “warm up” to this “cool house” by using components of SmartHome Cleveland design to improve our community’s use of its natural resources. In October 2011 the SmartHome was moved to a residential neighborhood in Cleveland’s University Circle area and will serve as a real home for a family so that further innovation and development can be conducted on its systems.

For more information on saving energy in your home, download the U.S. Department of Energy’s “Energy Savers Booklet (pdf).”

Additional audio, video, and images: "What Makes a Smart Home Smart?" Sound of Ideas radio report, WCPN ideastream.

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Category: Energy, Engineering, Environment

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George Viebranz

About the Author ()

George Viebranz is a mathematics and science content specialist with ideastream’s Education Division. He spent 32 years as a mathematics and science teacher and curriculum supervisor before joining ideastream. He has worked on more than 50 television and radio productions focusing on the improvement of K-12 mathematics, science, engineering and technology education.
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