08_Series%20and%20parallel_bwhandouts

08_Series%20and%20parallel_bwhandouts - Heat transfer in...

Info iconThis preview shows pages 1–4. Sign up to view the full content.

View Full Document Right Arrow Icon
07_Series and parallel_Benton_2004 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 designer’s use! Bill Burke
Background image of page 1

Info iconThis preview has intentionally blurred sections. Sign up to view the full version.

View Full DocumentRight Arrow Icon
07_Series and parallel_Benton_2004 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 º F Conductivity Btu in/hr ft 2 ºF Conductance Btu/hr ft 2 ºF Resistivity hr ft 2 ºF /Btu in Resistance hr ft 2 º F/Btu Air film resistance hr ft 2 º F/Btu In Review: A Festival of Material Properties Density lb/Ft3 Specific Heat Btu/lb º F Conductivity Btu in/hr ft 2 ºF Conductance Btu/hr ft 2 ºF Resistivity hr ft 2 ºF /Btu in Resistance hr ft 2 º F/Btu Air film resistance hr ft 2 º 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 º F Conductivity Btu in/hr ft 2 ºF Conductance Btu/hr ft 2 ºF Resistivity hr ft 2 ºF /Btu in Resistance hr ft 2 º F/Btu Air film resistance hr ft 2 º 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 Ћ + Л + Н = 1.0 Џ = Ћ (for a given wavelength) Џ = 1 – Л .
Background image of page 2
07_Series and parallel_Benton_2004 How does a Thermos work? From the Dept. of Energy’s “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 rat ling, wiggling motion of al 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 mil ing about, even though the crowd isn't going anywhere. It's like that with solid objects, which are real y vast "crowds" of individual atoms, that may be quiet (cold) or may be mil ing 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
Background image of page 3

Info iconThis preview has intentionally blurred sections. Sign up to view the full version.

View Full DocumentRight Arrow Icon
Image of page 4
This is the end of the preview. Sign up to access the rest of the document.

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.

Page1 / 10

08_Series%20and%20parallel_bwhandouts - Heat transfer in...

This preview shows document pages 1 - 4. Sign up to view the full document.

View Full Document Right Arrow Icon
Ask a homework question - tutors are online