Q4: A spherical tank, Im in diameter, is maintained at a temperature of 120 °C and exposed to a convection environment. With h. =25 W/m2 C and T 15 °C, what thickness of urethane foam should be added to ensure that the outer temperature of the insulation does not exceed 40 °C . What percentage reduction in heat loss results from installing this insulation. Ans : t = 0.023 m q( W/ ins) = 1982

Q: 3.5 A dormitory at a large university, built 50 years ago, has exterior walls constructed of L, =…

A: Given data Ls = 25 mm Ks = 0.1 W/mk Li = 25 mm Ki = 0.029 W/mk Lg= 5 mm Kg = 1.4 W/mk Ti = 22°C ,…

Q: You have mounted 100W PCBs as vertical fins.  The fins are 60mm deep x 60mm high x 1mm thick and…

A: Given:   k = 0.025 W/mK Pr = 0.72 v = 1.847 x 10−5u = 16.84 x 10−6 p = 1.2 kg/m3B = 1Tf (ideal…

Q: A small storage room has the dimensions of 20 m X 20m X 3m high. The walls of the storage consist of…

A:

Q: A 1 in. o.d. (outer diameter) tube reactor is insulated with a 3 inch layer of asbestos. If the…

A: Solution: Given Data: D=1 int=3 inTo=100oFQL=50 BTU/hrka=0.105 BTU/hr-ft-oF   To Find: Temperature…

Q: 11. A steam pipe, 3-cm ID, 5 mm thick and 10 meters long, permits a 100°C water flowing inside. If…

A: Given dataDi=30mmt=5mml=10mk=0.015 w/m°cTo find R

Q: A small storage room has the dimensions of 20 m X 20m X 3m high. The walls of the storage consist of…

A: For finding the temperature of inner wall of the brick steady heat flow concept is applied.

Q: 1) The heat flux and surface temperature of a board are related to each other with the thickness…

A:

Q: There is a horizontal PVC pipe (k=0.16 W/m°C) with a diameter of 15 cm, a wall of 3 mm and a length…

A:

Q: A one-story house is built over a vented crawl space. The attic is alsovented. The heating system is…

A: The temperature distribution represents the temperature at finite points on the surface. The…

Q: Qigihar House in Heilongiiang Province, China Heat Loss Problems, BSCl 2101 Climate: Avg.…

A:

Q: An office space of 15 ft x12 ft x10 ft height. The heat loss through walls is (6949.8 Btuh) if…

A: An office space of 15 ft x12 ft x10 ft height. The heat loss through walls is (6949.8 Btuh) if…

Conduction and Convection

When energy travels from one object to another it is said to have undergone heat transfer. Heat transfer is nothing but the transfer of thermal energy or internal energy from one thing to another, like e.g., when a vessel with water, kept on top of a burner, heats up because of the flame underneath it.