Oil in an engine is being cooled by air in a cross-flow heat exchanger, where both fluids are unmixed. oil (cp = 2000 j/kg. k) flowing with a flow rate of 0.020 kg/s enters the heat exchanger at 75°c, while air (cp = 1000 j/kg. k) enters at 30°c with a flow rate of 0.20 kg/s. the overall heat transfer coefficient of the heat exchanger is 50 w/m2 . k and the total surface area is 1 m2 . determine: (a) the heat transfer effectiveness and (15 points) (b) the outlet temperature of the oil. (use the effectiveness-ntu method) (15 points)

Apump is used to circulate hot water in a home heating system. water enters the well-insulated pump operating at steady state at a rate of 0.42 gal/min. the inlet pressure and temperature are 14.7 lbf/in.2, and 180°f, respectively; at the exit the pressure is 60 lbf/in.2 the pump requires 1/15 hp of power input. water can be modeled as an incompressible substance with constant density of 60.58 lb/ft3 and constant specific heat of 1 btu/lb or. neglecting kinetic and potential energy effects, determine the temperature change, in °r, as the water flows through the pump.

Manometers are good examples of measuring instruments, nowadays they are not as common as before. a)-capacitive probe gauges b)-gravitational gauges deformation ) gauges d)-digital gauges

The flow rate of air through a through a pipe is 0.02 m5/s. a pitot static tube is placed in the flow. the radius of the pitot static tube is 1 mm. assuming the flow to be steady and the air to be at 300k, calculate the difference in total and static pressure if the diameter of the pipe is: (a) d 0.1 m d 0.05 m (c) d 0.01 m