fan ventilates at 500rev/min, the airflow is measyured at 150cubic meters/second. the ventilation pressure is 0.40kPa while thepressure along fan is0.85kPa.the mine requires 100cubic meters/second of air flow on an off day.efficiency=0.75. 1.new slow down speed required on an off day 2. Annual savings in electricty if the costs is R0.63/kWh 3. Comment on any savings in the maximum demand. 4. methods for reduction of speed on off-day.

fan ventilates at 500rev/min, the airflow is measyured at 150cubic meters/second. the ventilation pressure is 0.40kPa while thepressure along fan is0.85kPa.the mine requires 100cubic meters/second of air flow on an off day.efficiency=0.75. 1.new slow down speed required on an off day 2. Annual savings in electricty if the costs is R0.63/kWh 3. Comment on any savings in the maximum demand. 4. methods for reduction of speed on off-day.

Refrigeration and Air Conditioning Technology (MindTap Course List)

8th Edition

ISBN:9781305578296

Author:John Tomczyk, Eugene Silberstein, Bill Whitman, Bill Johnson

Publisher:John Tomczyk, Eugene Silberstein, Bill Whitman, Bill Johnson

Chapter40: Typical Operating Conditions

Section: Chapter Questions

Problem 10RQ: The seasonal energy efficiency ratio (SEER) includes the energy used in the _____and _____cycles.

See similar textbooks

Similar questions

1. Kuroto Hydro Electric Plant generates power for 4,850 watts with a flow rate of 712 Itrs/sec with head loss equal to 16%, what is the total efficiency of the plant.
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
What size pump is needed to supply 10 gpm to a cylinder when the electric motor is rotating at 1725 rpm? Assume 100% efficiency and state your answer in in3/rev to two decimal places.?
s) The FD fan delivered the air at the static pressure (350 kPa) with dynamic pressure (150 kPa). The airflow is (368 m³ /min). The fan shat power is (6000 hp). Calculate: 1- Static efficiency. 2- Fan power input. 3- Mechanical efficiency. Pr-Pz
A steam turbine receives a steam flow rate of 2kg/s and the power output is. 700 kW. The heat loss from the casing is negligible. B. when the velocity at the entrance is 60 m/s, the velocity at exit is 360 m/s, and the inlet pipe is 3 m above ?the exhaust pipe, the change of specific enthalpy across the turbine is 700 kJ 600 kJ 400kJ non of the above
1. As a junior city engineer of a municipality, you are tasked to design the specifications of the pump with 3650 cu.m/day. The water source in the municipality is from an open reservoir and will supply to a pressure tank that will distribute to the municipality. open 4l Pressure reservoir Tank 70 m 15 m Pump Determine the following specifications of the pump and piping system (assume fluid stagnation at the pump). Velocity head at pt.1 to 2 if the diameter of the pipe is a.) 200 mm b.) Suction pressure of the pump in kPa (Pressure at pt. 2). c.) Velocíty head at pt.3 to 4 if the diameter of the pipe is 150 mm d.) Discharge pressure of the pump in kPa (Pressure at pt. 4). Assume atmospheric pressure at the pump. If an air vent is installed at the pipe just right before the pressure tank with diameter of 20 mm, what is the velocity of discharge in m/s? The height of the pressure tank is 12 m, what is the flowrate in cu.m/hr at pt.5 if the diameter of the pipe is 150 mm? e.) f.)
A DC driven pump running at 100 rpm delivers 30 litres per second of water at 40°C against a total pumping head of 27 m with a pump efficiency of 60%. Barometer pressure is 758 mmHg. What pump speed and capacity, would result if pump rpm were increase to produce a pumping head of 36 m assuming no change in efficiency. 2. Pump digghange 20 T d is 1C00
A hydraulic vane pump running at 1800 rpm develops 2 L/s flow at 750 kPa. Volumetric efficiency is .85 and overall efficiency is 0.8. Determine the Actual Torque Required, TÀ (N- m). (Hint: first calculate the mechanical efficiency and theoretical flow rate. Convert rpm to rad/s). O 10.6 N-m O 9.94 N-m O 8.01 N-m O 9.35 N-m O 8.85 N-m
1. A centrifugal pump has external and internal diameters of 300 mm and 150 mm respectively. The vane angles of inlct and outlet are 25 and 30° and the pump runs at 1450 r.p.m, If the velocity of flow through the pump is constant, find the work done per kN of water. (Ans. 20-2 kJ)
A 4in3 hydraulic motor has a mechanical efficiency of .91 and a volumetric efficiency of .83. It produces 700lb∙in of torque at 1120 rpm. System flow is provided by a piston pump that has a theoretical flow rate of 37 gpm and a mechanical efficiency of .91. The pump is driven by an electric motor with a .81 efficiency. Find the electric horsepower and kilowatts required to operate the system. What is the overall efficiency of the system?
Note: Don't copy from other experts solution. If you don't know the solution please leave it but don't give me wrong solution. A 26-kW motor with 78% efficiency drives a centrifugal pum p delivery 68 L/s against a head of 24 m. Determine the pump efficiency.
Seven hundred gallons per minute of water are being discharged by a centrifugal pump 5 ft above the pump inlet. The inlet pressure is 4-in Hg above the atmospheric and the discharge pressure is 29 psia. If the pump has an 8-in diameter inlet and a 4-in diameter discharge, find the pump efficiency. Assume the pump input is 8Hp.A. 55%B. 64%C. 73%D. 84%