[大學(xué)英語]2007年12月大學(xué)英語六級(jí)真題a卷可編輯-在線瀏覽
2025-02-25 20:43本頁(yè)面
【正文】 Forty percent of that powers oldfashioned incandescent light bulbsa 19thcentury technology that wastes most of the power it consumes on unwanted heat Compact fluorescent lamps or CFLs not only use 75 to 80 percent less electricity than incandescent bulbs to generate the same amount of light but they also last 10 times longer Phasing old bulbs out by 2030 would save the output of 650 power plants and avoid the release of 700 million tons of carbon into the atmosphere each year Comfort Zone Water boilers space heaters and air conditioners have been notoriously inefficient The heat pump has altered that equation It removes heat from the air outside or the ground below and uses it to supply heat to a building or its water supply In the summer the system can be reversed to cool buildings as well Most new residential buildings in Sweden are already heated with groundsource heat pumps Such systems consume almost no conventional fuel at all Several countries have used subsidies to jump
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