{[ promptMessage ]}

Bookmark it

{[ promptMessage ]}

4_pdfsam_Quizzes 11-14 solutions_1

# 4_pdfsam_Quizzes 11-14 solutions_1 - In the northeastern...

This preview shows page 1. Sign up to view the full content.

This is the end of the preview. Sign up to access the rest of the document.

Unformatted text preview: In the northeastern United States, certain regions get a lot of snow in wintertime. An example is the Buffalo, NY, area, where, due to the lake effect, yearly snowfall amounts to roughly 100 inches. One way to save energy for cooling during the summer months is to pile the snow up into a sizable mound, or order 100 m X 100 m x 10 m. By covering with the proper insulating material, the lost (due to melting) can be kept down to ~ 3 111 into summer. ' V 3. Assuming the mound is at —10 0C, with what is left for summer use, how many BTU of cooling can be harvested if the snow is melted and raised to 25 °C (assuming 100 % efficiency, and a snow mass density of roughly 250 Kg/m3) (4 points)? [Specific heat of ice 2,090 J/kg°C, of water 4,190 J/ngC, latent heat of fusion 3.33 x 105 J/kg, latent heat of evaporation 2.26 X 106 J/kg.] e fvas = PVr— QBO’N‘E- localoo'm-‘lww HS'l‘)7 L93 b. The sun’s surface (radius 7 x 105 km) is at a temperature of 5,800 K. The surface emits with an emissivity close to 1, at a distance of 1.5 x 103 km from earth. If the snow absorbs 50 % of the sunlight impinging on it, assuming the sunlight shines down directly on the snow mound from above, and that the area of the mound does not shrink, how many hours would it take to melt the entire volume that is available for summer use (3 points)? rm. twat... (>5 that - s.bi-\o“°-s«s;.-1‘530<>l = Eds-is” w P _ ”id’s-lb” W= 1‘ ﬁft- 4110.549“? 3 mm W“; Page»? W‘oSthl‘. PALS ‘5 (Emcimch‘CLn-Lmsi-LjNCﬂMK) M f : of: ~l3d7.30%1-lo" if = rage-m" w (Ema—r35 W “W W‘W) P alas M‘ T1 ,(W = Q :7 twat-(due. RH @Q ...
View Full Document

{[ snackBarMessage ]}

### What students are saying

• 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.

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

• 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.

Dana University of Pennsylvania ‘17, Course Hero Intern

• 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.

Jill Tulane University ‘16, Course Hero Intern