Engineering, 11.12.2019 20:31 jamesgraham577

Water at 50°c is routed from one building in which it is generated to an adjoining building in which it is used for space heating. transfer between the buildings occurs in a steel pipe (k = 60 w/m-k) of 100-mm outside diameter and 8-mm wall thickness. during the winter representative environmental conditions involve air at t[infinity] = -5°c and v = 3 m/s in cross flow over the pipe.

a) if the cost of producing the hot water is $0.05 per kw-hr, what is the representative daily cost of heat loss from an uninsulated pipe to the air per meter of pipe length? the convection resistance associated with water flow in the pipe may be neglected.
b) determine the savings associated with application of a 10-mm-thick coating of urethane insulation (k = 0.026 w/m-k) to the outer surface of the pipe.

Answers: 1

Show answers

Another question on Engineering

Engineering, 04.07.2019 18:10

Acompressor receives the shaft work to decrease the pressure of the fluid. a)- true b)- false

Answers: 3

Answer

Engineering, 04.07.2019 18:10

Asingle-geared blanking press has a stroke of 200 mm and a rated capacity of 320 kn. a cam driven ram is assumed to be capable of delivering the full press load at constant force during the last 15 percent of a constant-velocity stroke. the camshaft has an average speed of 90 rev/min and is geared to the flywheel shaft at a 6: 1 ratio. the total work done is to include an allowance of 16 percent for friction a) estimate the maximum energy fluctuation b) find the rim weight for an effective diameter of 1.2 m and a coefficient of speed fluctuation of 0.10

Answers: 1

Answer

Engineering, 04.07.2019 18:20

Vibration monitoring this technique uses the noise or vibration created by mechanical equipment and in seme cases by plant systems to detemine their actual condtion. a)- true b)- false

Answers: 2

Answer

Engineering, 04.07.2019 18:20

A2-m rigid tank initially contains saturated water vapor at 100 kpa. the tank is connected to a supply line through a valve. steam is flowing in the supply line at 600 kpa and 300 c. the valve is opened, and steam is allowed to enter the tank until the pressure in the tank reaches the line pressure, at which point the valve is closed. a thermometer placed in the tank indicates that the temperature at the final state is 200°c. determine (a) the mass of steam that has entered the tank (b) the amount of heat transfer.

Answers: 3

Answer

You know the right answer?

Water at 50°c is routed from one building in which it is generated to an adjoining building in which...

Questions