ENG/PHY160 May 10, 2011. http://sexualsoul.tumblr.com/post/5436707155. I Carbon Sequestration II Conservation . ``First law of Economics:’’ . TANSTAAFL. T here A in’t N o S uch T hing A s A F ree L unch . The equivalent for economists of the Second
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I Carbon Sequestration
The equivalent for economists of the Second
Law of thermodynamics—always a cost no matter
what. We will examine the costs and not present
``green technologies’’ as panaceas, but as subjects
to study and consider for implementation.
Mammoth Lakes Area (Gradual leak)
Lake Nyos, roiled after Limnic Eruption
Heat loss = Si AiDT/Ri
Straw Bale House Dining Room
Mattawa WA Library
Straw bale in British Columbia
Real Goods Store,
Interior of Santa Fe Straw Bale House
tested plastered straw bales for fire safety and found them to perform better than
conventional building materials. In fact, the plaster surface withstood temperatures of
about 1,850� F for two hours before any cracks developed. According to the Canada
Mortgage and Housing Corporation, "The straw-bales/mortar structure wall has proven
to be exceptionally resistant to fire. The straw bales hold enough air to provide good
insulation value, but because they are compacted firmly, they don't hold enough air to
permit combustion." (Source: http://www.eere.energy.gov/buildings/info/components/envelope/framing/strawbale.html)
Table 4. Life cycle cost estimate for conventional vs straw-bale houses
Conventional(Construction)$82,500 (Finance)396,000(Energy)120,000 (Total)532,500(Savings)------Straw bale(Construction)$78,375 (Finance)376,000(Energy)60,000 (Total)451,675(Savings)83,875Straw Bale* (Construction)$40,000 (Finance)192,000(Energy)60,000 (Total)260,000(Savings)272,500*owner-built walls, finishing, roofingNotes:
Life cycle = 100 years.
Finance cost = construction cost minus down payment of twenty percent at an annual interest rate of
six percent over the one hundred year life cycle (does not include closing costs when the house is sold).
Energy = the average cost for heating and cooling a conventional home for this analysis to be $100 per month.
Total = Amount of down payment plus energy and finance.
Source: Working Group Reports, Plastered Straw Bale Conference, "Roots and Revival," Arthur Nebraska, September, 1993.
Source: http://www.eere.energy.gov/buildings/info/components/envelope/framing/strawbale.htmlAdditional benefits
http://www.sfgate.com/cgi-bin/article.cgi?file=/chronicle/archive/2002/02/03/CM28488.DTL and http://www.harrisondocumentary.com/ )
What is Cob?
Earth is probably still the world's commonest building material. The word cob comes from an old English root meaning a lump or rounded mass. Cob building uses hands and feet to form lumps of earth mixed with sand and straw, a sensory and aesthetic experience similar to sculpting with clay. Cob is easy to learn and inexpensive to build. Because there are no forms, ramming, cement or rectilinear bricks, cob lends itself to organic shapes: curved walls, arches and niches. Earth homes are cool in summer, warm in winter. Cob's resistance to rain and cold makes it ideally suited to cold climates like the Pacific Northwest, and to desert conditions.
Cob has been used for millennia even in the harsh climates of coastal Britain, at the latitude of the Aleutians. Thousands of comfortable and picturesque cob homes in England have been continuously occupied for many centuries and now command very high market values. With recent rises in the price of lumber and increasing interest in natural and environmentally safe building practices, cob is enjoying a renaissance. This ancient technology doesn't contribute to deforestation, pollution or mining nor depend on manufactured materials or power tools. Earth is non-toxic and completely recyclable. In this age of environmental degradation, dwindling natural resources, and chemical toxins hidden in our homes, doesn't it make sense to return to nature's most abundant, cheap and healthy building material?
Cob House in New Zealand
Cob house in Russia
Shaping Cob by Hand
Cob Mud Pit Dance