University:
California State University, Northridge
Course:
ME 584 | Modeling and Simulation of Dynamic Systems
Academic year:

2010
Views:

367

Pages:

13
Author:

Hugh Kaufman

Circuit Analysis of Static Thermal Systems Example 1: Lowest Cost for Thermal Conductivity Example 1: Lowest Cost for Thermal Conductivity Chp6 17 Example 1: Lowest Cost for Thermal Conductivity Chp6 18 Example 2: Pair-Share: Heat Loss Through Window • Calculate the amount of heat loss (in Watts) through an uncovered window in a home. The temperature difference between the air inside and outside of the house is 200C, with moderate convection on each side of the glass. The size of the glass is 0.75m by 1.2 m, and the thickness is 3 mm. Chp6 Example 2: Heat Loss Through Window 19 Chp6 20 Example 2: Heat Loss Through Window Chp6 21 Example 3: Radiator Hose • The radiator hose on an automobile is made of something similar to BunaTM rubber. The internal diameter of the hose is 50 mm, its length is 200mm, and its thickness is 6 mm. The water on the inside is maintained at 1000C, and the outside air temperature is 500C. Calculate how much heat is conducted through the hose. Chp6 22 Example 3: Radiator Hose Eq. 6.10 (pg. 178) Chp6 23 Example 4: Pair-Share: Iron Pipe A ¾ inch pipe (ID = .824 inch, OD = 1.050 inches) is used to transmit hot water. The internal water temperature is 1200F, and the ambient air temperature is 750F. Consider a pipe that is 5 feet in length. – Calculate how much heat is transferred from the water to air. – If a spongy rubber tape that is 0.1 inch thick is placed on the outside of the pipe, calculate how much heat is transferred. – What is the reduction in heat loss with the use of the rubber insulation? Chp6 24 Example 4: Pair-Share: Iron Pipe Chp6 25 Example 4: Pair-Share: Iron Pipe Chp6 26 Example 4: Pair-Share: Iron Pipe

Circuit Analysis of Static Thermal Systems