15. The 60-W fan of a central heating system is to circulate air through the ducts. The analysis ofthe flow shows that the fan needs to raise the pressure of air by 50 Pa to maintain flow. Thefan is located in a horizontal flow section whose diameter is 30 cm at both the inlet and theoutlet. Determine the highest possible average flow velocity in the duct.CHAPTER 2ENERGY CONCEPTS: WORK AND HEAT

The net transfer of energy through a system is the net difference between the input energy and the…

Answered: 15. The 60-W fan of a central heating…

Elements Of Electromagnetics

7th Edition

ISBN:9780190698614

Author:Sadiku, Matthew N. O.

Publisher:Sadiku, Matthew N. O.

ChapterMA: Math Assessment

Section: Chapter Questions

Problem 1.1MA

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An air pump is used to fill a rigid gas bottle with air. The pump is connected to the gas bottle via a rigid pipe. The pump consists of a piston of internal diameter d=0.08 m and a cylinder with a stroke L=0.3m. Air enters the pump through an orifice located at the bottom of the cylinder to raise the pressure in the pump to atmospheric pressure. Air, drawn into the pump through the orifice, mixes completely and adiabatically with the cylinder contents. A valve allows the bottle's refill. The valve opens when the pump pressure is equal to the gas bottle. The valve is always closed when the pump pressure is below the gas bottle pressure. Pressure drop across the valve can be neglected. The bottle, the connecting pipe and the pump are thermally insulated. Air in the pump and connecting pipe undergoes isentropic compression and expansion processes. I F-one The working fluid (air) can be considered a perfect gas with R=287 J/KgK, cp=1005 J/KgK and y=1.4. Initially the piston is located at…
A nozzle operates with steam entering at 700 kPa and 300 °C. The velocity at the inlet is 30 m/s. As the steam flows through the nozzle, the pressure decreases. Determine the area ratio value (Area / Area inlet), where Area inlet is the cross sectional area of the nozzle at the inlet, at the sections of the nozzle where the pressure values are 650, 550, 450, 350, and 250 kPa. Assume nozzle operates isentropically.
Determine the electrical power supplied to a boiler when the temperature of the entering water is 20 C and the exiting temperature is 89 C. The flow of.the pressured water is 2 Kg/s. There is a negligible pressure drop through this boiler and it operates at a constant pressure of 3 bars. The specific heat is c = 4,370 J/(Kg K). There is a 150000 W rate of heat loss from the boiler during this process to a surrounding at 293.2 k. Consider steady state conditions. Calculate the total rate of entropy production. Calculate the total rate of exergy destruction (W) The dead state temperature is 293.2 K and pressure is 1 bar.
A reservoir is at effective height of 95m. An irreversible pump is used to pump a mass flow of 4500 kg/s of water from ground level into the reservoir. Consider water as an incompressible liquid with mass density of 1000kg/m . 1) What is the power consumption of pump for an isentropic pump efficiency of 82%? 2) What is the power that can be recovered from a turbine with 93%? (with the same mass flow and height). 3)What is the change in temperature of the pumped water?

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