EGEE7 - Lesson 7 Home heating is the single highest energy...

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Lesson 7 Home heating is the single highest energy expense for a household o Energy spent for residential space heating accounts for about 10 percent of the total energy consumed in the US o Average household consumes 92 million BTUs and 46% of that is used for home heating o Average annual home heating expenses were $1,488 n 2001 o Home energy use also accounted for 20 percent of the greenhouse gas emissions Reduction of energy consumption in home heating results in substantial monetary savings and reduction in air pollution (could reduce 30%) Houses are heated to keep the temperature inside at about 65 degrees F when the outside temperature is lower o Requires constant heat because of heat loss Can escape from various places including: roof, walls, doors, windows, basement walls, chimney, vents, and even the floor o The more heat the house leaks, the more the furnace has to put out to make up for the loss o In order for a furnace to keep up it must use more fuel , hence higher fuel or heating costs o Furnaces are not 100 percent efficient When a furnace’s efficiency is lower, the fuel consumption is the same amount of heat output will be even hgher 35% of the heat is lost through cracks in the walls windows and doors, 17% through the walls, 3% through walls, 16% through windows, 5% through the roof, 1% through basement floor, and 20% through basement walls. Heat escapes from inside to outside by three mechanisms from a home: o Conduction: process by which heat is transferred from the hot area of a solid object to the cool area of a solid object by the collisions of particles
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In solids the atoms or molecules do not have the freedom to move, as liquids or gases do, so theenergy is stored in the vibration o atoms An atom or molecule with more enrgy transfers energy to an adjacent atom or molecule by physical contact or collisions Rod and candle example: heat is conducted from the end of the rod in the candle flam further down the to the cooler end of the rod as the vibrations of one molecule are passed to the next , however there is no movement of
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This note was uploaded on 03/31/2008 for the course EGEE 102 taught by Professor Pisupati,sarmave during the Spring '07 term at Pennsylvania State University, University Park.

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EGEE7 - Lesson 7 Home heating is the single highest energy...

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