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Snow Blowers Bad, Snow Scoops Good

By Lee Consavage

Now that spring is here and I’m starting to feel more confident that I can really hang up my snow scoop for the season, I wanted to offer a little eco-friendly advice about using snow scoops and snow blowers.

You may think spring is an unusual time to discuss snow removing equipment as you prepare to store your snow blower for the season. But just think of all that room in your garage being occupied by equipment you may use up to 10 times each year (albeit a very important 10 times each year). And just think of all the cost and time spent preparing the blower for use each year and then preparing the blower to be stored each spring. Not to mention the initial, maintenance and fuel costs.

And then there’s the option I choose: I spent $54 at my local hardware store to purchase a 10 pound snow scoop that I hang on the wall of my barn. No preparation, no maintenance and no fuel (other than a extra bagel or two for me) is required for my human-power snow scoop.

I’ve heard so many eco-conscious folks say “Renewable energy is so expensive. Isn’t there some inexpensive renewable energy option I could afford?” There is!

Using a snow scoop instead of a snow blower would be one very inexpensive way to substantially reduce your carbon footprint. I know you were thinking of a less back-breaking way to reduce your carbon footprint. I’m here to tell you that using a snow scoop doesn’t exert much pressure on your back. It’s all arm work from pushing the scoop. And it’s actually quite fun. I like being outdoors anyway, especially on those sunny mornings after a big snow storm. Listening to music or the latest news on my solar powered radio adds to my enjoyment as I push snow from my driveway. It also helps drown out the annoying noise from snow blower’s in my neighborhood.

When I bought my home here in southern Maine in 1984, I was a young, active, healthy, 26 year old. The thought of using a snow blower never crossed my mind. I like being outdoors, I like physical activity, I like listening to my radio, I like spending $15 for a snow shovel, I don’t like the noise generated from a machine that shoots snow 10 feet in the air, and I don’t like the smell of gasoline. So it was a no-brainer. Twenty-four years later I’m still healthy and active and I’m still using a snow shovel. Actually I have upgraded to a snow scoop now.

Using a snow shovel can be back breaking – especially at the end of the driveway with mounds of heavy, hard-packed snow left by the snow plow clearing the roads. With a snow scoop I’m easily able to scoop up and move even the heaviest hard-packed snow without much effort. For years I thought it would not be practical for me to use a snow scoop since I have rock walls on either side of my driveway. No problem – I just make snow ramps to go up and over the rock walls with little effort.

Now that I’ve discussed the economical and healthy benefits, let’s talk about the environmental benefits. A 1-horsepower snow blower emits about 1 pound of harmful carbon dioxide and other greenhouse gases for each hour the snow blower is used. A 5-horsepower snow blower would emit 5 pounds of carbon dioxide per hour. A 10-horsepower snow blower would emit 10 pounds of carbon dioxide per hour. You can determine how much pollution your snow blower emits at Canada’s Environmental Technology Centre: www.etc-cte.ec.gc.ca. You can also see have many pounds of greenhouse gases are contributed by your lawnmower at this same site. In future blogs I’ll write about the health, economical and environments benefits (and my fun filled summers) using a human powered push reel mower instead of a motorized lawn mower and also using a rake instead of a leaf blower.

 

Tri-Generation in Western Massachusetts

By Lee Consavage

I apologize for my tardiness in posting this blog but fortunately I can blame it on renewable energy (and the IRS - I just completed and submitted our company’s tax forms which were due March 15th). Due to the recent increase in energy costs, I’ve been fielding a lot of questions about renewable energy alternatives. I now have lots of interesting projects I’m working on, but not much time to write about them. So I’ll update you on my most interesting project, which is a tri-generation project. Tri-generation is also known as Combined Cooling, Heat and Power or CCHP.

 

In a previous blog I described a co-generation system being considered for the new Cross Roads House facility to be built in Portsmouth (refer to my blog on January 12th, 2008). Again to briefly summarize, a co-generation unit, such as a Capstone microturbine (www.microturbine.com), creates both electricity and heat. The co-generation unit is typically located inside the building that is using both the electricity and heat. So essentially the building has its own power plant to meet some or all of its electricity and heating needs. Heat is actually the by-product of creating the electricity, so the facility pays to create the electricity but then gets free heat. The microturbine uses natural gas, propane or landfill gas to create the electricity.

Getting free heat is great during these long, cold New England winters. But what about the summer months when air conditioning is needed. Won’t all that excess heat being generated by the microturbine result in higher air conditioning costs? The answer is “yes” if the heat cannot be used and needs to be exhausted from the building. So wouldn’t it be great if your co-generation system could somehow use all that heat for cooling purposes. Well it can! Absorption Chillers, such as the ones made by Yazaki (www.Yazaki.com) are made exactly for that purpose. It uses heat to provide cooling. Sounds unbelievable doesn’t it, but it really does work. Absorption chillers use hot water (190 degrees F) to provide chilled water to cool the building. Absorption chillers are only available for large buildings, but residential sized units are currently being developed. When an absorption chiller is used in conjunction with a microturbine, the system is referred to as tri-generation.

I recently visited the home of a very, very, very wealthy family in western Massachusetts who are interested in a tri-generation system being installed on their property to provide electricity, heating and cooling to their home and other buildings on their 100+ acres. Due to the enormous amount of electricity and heat produced by a microturbine, it is highly unusual for a tri-generation system to be installed at a private residence. I applaud this family for taking the time to learn about the tri-generation technology and its huge positive environmental benefits. The current plans are to install four Capstone C65 (65 kilowatt) microturbines and two Yazaki 20-ton absorption chillers.

The greenhouse gas reduction attributable to using this tri-generation system is approximately 1,400 tons of carbon dioxide. This reduction is equal to removing the carbon that would be absorbed by 400 acres of forest! Wow! So why is the greenhouse gas reduction so great? It’s because the tri-generation system uses a relatively low emissions fuel (natural gas, propane or landfill gas) and has an efficiently rating greater than 80%. A typical power plant is 25% efficient since none of the heat by-product is captured and used. And then there are the transmission losses of 5% or more.

I know you’re thinking that similar environmental benefits could be realized if this family were to just purchase their electricity from a renewable energy source, such as wind or solar. Then they could avoid the high cost of installing the tri-generation system. You’re right to a certain extent. But they would still need to transport the wind or solar energy to their home, resulting in transmission losses. Also the heat generated by the wind turbine and/or the solar electric panels is wasted. And the family still needs to heat and cool their home. So taking the heating, cooling and electricity production into consideration, the environmental benefits from a tri-generation system have a greater impact than just using wind or solar. More to come………

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