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Homework Assignment for Thermal Engineering Courses: ARE 346P, ARE 389H, CE 389H - Prof. J, Assignments of Architecture

The University of Texas at AustinArchitecture
Prof. Jeffrey A. Siegel

A homework assignment for students enrolled in thermal engineering courses (are 346p, are 389h, ce 389h) at a university. The assignment, due on february 10, 2009, consists of three problems that require students to calculate heat transfer rates and evaluate wall constructions. The problems involve using given data and tables, and students are reminded to consider air films in their calculations. The total points for the assignment are 30.

Typology: Assignments

Pre 2010

Uploaded on 08/31/2009

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ARE 346P/ARE 389H/CE 389H
Homework Assignment 2 February 3, 2009
DUE: February 10, 2009 30 pts total
1. Problem 2.10 10 pts
b) Why is this wall construction not really reasonable? Would the actual
rate of heat transfer for a reasonable wall be higher or lower than what you
calculated? Why?
Don’t forget air films, Rtotal = 11.4 hr ft2 ºF / BTU
2. Problem 14.8 10 pts
Don’t forget air films, Approximate when using Tables 14.1 and 14.2,
Rtotal = 6 ft2 ºF / BTU
3. Problem 15.1 10 pts
You can use average values for 40º Latitude.
IDN = 876 W/m2 , IDH = 119 W/m2 , te = 78.6 °C

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ARE 346P/ARE 389H/CE 389H

Homework Assignment 2 February 3, 2009

DUE: February 10, 2009 30 pts total

  1. Problem 2.10 10 pts b) Why is this wall construction not really reasonable? Would the actual rate of heat transfer for a reasonable wall be higher or lower than what you calculated? Why? Don’t forget air films, Rtotal = 11.4 hr ft^2 ºF / BTU
  2. Problem 14.8 10 pts Don’t forget air films, Approximate  when using Tables 14.1 and 14.2, Rtotal = 6 ft 2 ºF / BTU
  3. Problem 15.1 10 pts You can use average values for 40º Latitude. IDN = 876 W/m 2 , IDH = 119 W/m 2 , te = 78.6 °C