08_Series%20and%20parallel_2008

08_Series%20and%20parallel_2008 - Heat transfer in series...

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Unformatted text preview: Heat transfer in series and parallel Preamble (projection screen off): The 140 Way Taking the pulse of buildings -- Vital Signs, back of envelope The Oakland Firestorm anecdote the best windows How does a Thermos work? Later we shift to survey coverage Heat transfer week continues Heat transfer in series and parallel Field trip to the remarkable Pacific Energy Center in San Francisco where you saw with your own eyes radiation emitted at 10 micron wavelengths from terrestrial surfaces! You saw the amazing Heliodon cast shadows before your very eyes for any place on the planet at any time! Ryan Stroupe You boggled at the Tool Lending Library where over $1,500,00.00 of scientific measurement instruments are available for designers use! Bill Burke You danced the jig of joy that you got to spend section on a fun field trip as opposed to yet more time in Wurster! Robert Marcial You marveled at ingenious apparatus (like this sky simulator) designed to aid architects in the exploration of physical building performance. Anna LaRue In Review: A Festival of Material Properties Density lb/Ft3 Specific Heat Btu/lb F Conductivity Btu in/hr ft 2 F Conductance Btu/hr ft 2 F Resistivity hr ft 2 F /Btu in Resistance hr ft 2 F/Btu Air film resistance hr ft 2 F/Btu In Review: A Festival of Material Properties Density lb/Ft3 Specific Heat Btu/lb F Conductivity Btu in/hr ft 2 F Conductance Btu/hr ft 2 F Resistivity hr ft 2 F /Btu in Resistance hr ft 2 F/Btu Air film resistance hr ft 2 F/Btu ivity i mplies v ariability i n t hickness, y o! In Review: A Festival of Material Properties Density lb/Ft3 Specific Heat Btu/lb F Conductivity Btu in/hr ft 2 F Conductance Btu/hr ft 2 F Resistivity hr ft 2 F /Btu in Resistance hr ft 2 F/Btu Air film resistance hr ft 2 F/Btu Absorptivity unitless Reflectivity Transmissivity Emissivity (LWIR) In Review: Equations from last lecture Conduction Q = k/d x A x T = 1/R x A x T Convection R i = 1/h i = 0.68 (vertical interior) R o = 1/h o = 0.25 (summer) = 0.17 (winter) Radiation + + = 1.0 = (for a given wavelength) = 1 . How does a Thermos work? From the Dept. of Energys Ask a Scientist Program Name: Karen T Question - How does a thermos work? Status: student Age: 14 First, you need to know what heat is. Heat is the rattling, wiggling motion of all the atoms that make up a substance. It's a form of motion energy, but special because the solid as a whole isn't going anywhere. How is that possible? Imagine a large crowd of people standing around, in line, perhaps, for concert tickets. They could be standing quietly or shoving and milling about, even though the crowd isn't going anywhere. It's like that with solid objects, which are really vast "crowds" of individual atoms, that may be quiet (cold) or may be milling around excitedly (hot). A hot (jumpy) solid contains more energy per unit volume than a cold (quiet) solid. If we put a hot solid next to a cold, then some (cold) or may be milling around excitedly (hot)....
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This note was uploaded on 01/13/2010 for the course ARCH 140 taught by Professor Benton during the Spring '08 term at University of California, Berkeley.

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08_Series%20and%20parallel_2008 - Heat transfer in series...

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