{[ promptMessage ]}

Bookmark it

{[ promptMessage ]}

P110_2008_Week_6

P110_2008_Week_6 - P120 Exam I 2008 Avg 86.2 110 = 78 14 12...

Info icon This preview shows pages 1–9. Sign up to view the full content.

View Full Document Right Arrow Icon
P120 Exam I 2008 Avg: 86.2/110 = 78% 0 2 4 6 8 10 12 14 55 60 65 70 75 80 85 90 95 100 105 110 More Bin Frequency Series1
Image of page 1

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

View Full Document Right Arrow Icon
Infiltration Q = 0.018 Btu/ft 3 .hr.F o V K T Here K is the number of “Air exchanges per hour” and V is the interior volume of the house/building. Note: some exchange of air is necessary (you need to breath!), and this is not readily apparent in this figure.
Image of page 2
Some typical R values Material Thickness R (ft 2 .h. o F/Btu) Hardwood 1” 0.81 Concrete block 8” 1.25 1-pane window 0.125” 0.88 2-pane window 0.5” air 1.72 Fiberglass 7” 21.8 Polyurethane 1” 6.3 Nylon carpet 1” 2.0 Wood siding 0.5” 0.81 Plywood 0.5” 0.627 Plasterboard 0.5” 0.45 Steel 1” 0.0032
Image of page 3

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

View Full Document Right Arrow Icon
Degree-Days Heating/Cooling http://www.ersys.com/usa/18/1836003/wtr_norm.htm Indianapolis
Image of page 4
Price of Natural Gas (dollars/MBtu wholesale I believe) http://futures.tradingcharts.com/chart/NG/W
Image of page 5

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

View Full Document Right Arrow Icon
“Low-e” (emissivity) coatings on windows Conducting oxide Double metal layer Single metal layer Phys. Today Nov. 2000
Image of page 6
Basic Heat Engine Efficiency = η = W/Q H = (Q H -Q C )/Q H Recall that this works because the entropy increase at T c is greater than the entropy decrease at T H .
Image of page 7

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

View Full Document Right Arrow Icon
Heat Pumps (one system: heating and cooling) As we saw with heat engines, the second law of thermodynamics puts limits on how much cooling you can get for a given amount of work (entropy of the Universe must not decrease!! => Heat out to warm reservoir must exceed heat in from cold res.) Heat output is greater than work in!
Image of page 8
Image of page 9
This is the end of the preview. Sign up to access the rest of the document.

{[ snackBarMessage ]}

What students are saying

  • Left Quote Icon

    As a current student on this bumpy collegiate pathway, I stumbled upon Course Hero, where I can find study resources for nearly all my courses, get online help from tutors 24/7, and even share my old projects, papers, and lecture notes with other students.

    Student Picture

    Kiran Temple University Fox School of Business ‘17, Course Hero Intern

  • Left Quote Icon

    I cannot even describe how much Course Hero helped me this summer. It’s truly become something I can always rely on and help me. In the end, I was not only able to survive summer classes, but I was able to thrive thanks to Course Hero.

    Student Picture

    Dana University of Pennsylvania ‘17, Course Hero Intern

  • Left Quote Icon

    The ability to access any university’s resources through Course Hero proved invaluable in my case. I was behind on Tulane coursework and actually used UCLA’s materials to help me move forward and get everything together on time.

    Student Picture

    Jill Tulane University ‘16, Course Hero Intern