Chapter 7, Problem 7.128EP

Don't use shift solve

A forced draft fan is used to provide the combustion air requirements for a boiler that burns coal at the rate of 10 metric tons per hour. The air requirements are 100,000m3/hr , air is being provided under 150 mm water gage by a fan which has a mechanical efficiency of 60%. Find the size of the driving motor in kW

In a turbine, steam enters with an enthalpy of 1275 Btu/lb, and leaves with an enthalpy of 1115 Btu/lbm. The transferred heat is 13 Btu/ibm. Find the turbine work in hp where the steam flow rate is 5 lbm/sec?

A refrigeration system has a COP of 4.The compressor power is 30 kw.Find the mass of ice produced by the system in 16 hrs from 30C to ice at-6 C.if miscellaneous losses is 35%.

A pump operates at 600 W, the mass flow rate of the liquid is 1 kg/s, at the inlet the fluid is stagnate, and velocity at exit is 12 m/s, the mechanical efficiency of the pump is: Select one: a. 0.90 b. 0.91 c. 0.92 d. 0.89

A pump has a displacement of 90 cm3 . It delivers 1.25 LPS at 20 rps and 80 bar Find a) Overall efficiency of the pump b) What is the theoretical torque required to operate the pump? If prime mover input torque is 108 N-m.

In an internal gear pump, if the flow rate is 26 cm per revolution, the speed of the prime mover which is connected to the pump runs of with 1300 rpm,Find the The pump delivery rate in terms of litres per minute is

A pico hydro turgo turbine has a torque of 0.02Nm with a rotational speed of 41 rad/s. The nozzle or jet has a velocity of 14m/s with a diameter of 19mm. It has a volumetric flow rate of 0.00397 kg/s and a head of 10m. a) Using the specific gravity of water, find the efficiency of the turbine. b) Is the efficiency of the turbine too low? If so, what can you do to improve it.

A two stage air compressor has a suction condition of 100 kpa, 30 o C and has a capacity of 3m3/s. The discharge pressure is 750 kpa. Find the heat loss in the intercooler.