1. Group 3 Members: Agno, Jennilyn Balmes, Niña Chan, Armi Samia, Romulo Santos, Olivia

3. Solution

4. Solution

6. Solution

7. Solution When insulator 1 is the better insulator: Assume L=1m

8. Solution On insulator 1:

9. Solution On insulator 2:

10. Solution When insulator 2 is the better insulator:

11. Solution  When insulator1 is the better insulator, lower heat is being transferred for the pipe to the outside environment. (Computations are done regardless of the inner and outer temperature and the actual value of mean thermal conductivity)

12. Problem  Insulation for a refrigerated food warehouse . It wants to build a cold storage with a 19.1mm inner layer of pine, an intermediate layer Pressed cork and an outer layer of 50.8mm of concrete. The temperature of the wall interior is -17.8 C and the outer surface of 29.4 C in the concrete. The conductivities are averages for the pine, , to cork, , and for concrete The total internal surface area to be used in the calculations is approximately 39m2 (omitting the effects of corners and edges). How thick is the Cork pressing needed to keep the heat loss at 586 W?

13. Solution Pine Pressed Cork Concrete 19.1mm X 50.8mm

14. Solution

15. Solution If overall heat not exceed 586W:

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18. Solution

19. Solution Assume:

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21. Solution

22. Solution

23. Solution Iteration 2:

24. Solution