Ashell-and-tube heat exchanger is used for heating 14 kg/s of oil (cp = 2.0 kj/kg·k) from 20°c to 46°c. the heat exchanger has one shell pass and six tube passes. water enters the shell side at 80°c and leaves at 60°c. the overall heat transfer coefficient is estimated to be 1000 w/m2 ·k. calculate the rate of heat transfer and the heat transfer area.

The y form of iron is known as: a) ferrite b) cementite c) perlite d) austenite

Coiled springs ought to be very strong and stiff. si3n4 is a strong, stiff material. would you select this material for a spring? explain.

Ariver flows from north to south at 8 km/h. a boat is to cross this river from west to east at a speed of 20 km/h (speed of the boat with respect to the earth/ground). at what angle (in degrees) must the boat be pointed upstream such that it will proceed directly across the river (hint: find the speed of the boat with respect to water/river)? a 288 b. 21.8 c. 326 d. 30.2