A hair dryerjs basically a duct in which a few layers of electric resistors are placed. A small fan pulls the air in and forces itto flow over the resistors where it is heated. Air enters a 900-W hair dryer at 100 kPa and 25°C and leaves at 377 K. Thecróss-sectional area of the hair dryer at the exit is 60 cm4. Neglect the power consumed by the fan and the heat lossesthrough the walls of the hair dryer.T =P1= 100 kPaA2 = 60 cm2lllT= 25°CWe= 900 W%3DDetermine the volume flow rate of air at the inlet. You must provide an answer before moving to the next part.

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Answered: A hair dryer is basically a duct in…

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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A manometer with water as working fluid is connected to an air duct as shown in Figure 1.1. Air flow through the pipe at a rate of 170 L/s. The pipe diameter ismeasured to be 20 cm at the entrance, which reduces to half with asmooth reducing section. The pressure difference between the two pipesections is measured by a water manometer. Assume the systemoperates in the environment at a constant temperature 50°C. Determine the differential height of the water in the manometer and predict the changes of the differential height in the manometer if a fluid with the density lower than water is used as the working fluid. State at least 3 assumptions you have made for your calculations
A 3m3 rigid, insulated tank that is initially evacuated is connected through a valve to a supply line that carries R-134a at 2 MPa and 90°C. Now the valve is opened, and refrigerant is allowed to flow slowly into the tank until the pressure reaches 2 MPa, at which point the valve is closed. Determine: a. the final temperature of the refrigerant in the tank, and b. the mass of refrigerant in the tank.
Steam enters a nozzle at 600 °C and 1200 kPa with a velocity of 13 m/s and leaves at 400 °C and 600 kPa while losing heat at a rate of 26 kW For an inlet area of 870 cm2 determine the velocity and the volume flow rate of the steam at the nozzle exit. rks ME 203 ons Steam V2 = 599 899 m/s volume flow rate = 2678 m/s V2 = 619 002 mis yolume flow rate = 3 152 m ls V2 = 914 995 m/s
Water is being heated in a close pan on top of a range while being stirred by a paddle wheel. During the process, 30kj of heat are transferred to the water, and 5kj of heat is lost to the surrounding air. The paddle-wheel work amounts to 500 N*m. Determine the final energy of the system if its initial energy is 10kj.
Thank you so much can you hand write clear please
A fluid with a pressure of 850kPa, a specific volume of 0.35m3/kg, and a velocity of 170m/s enter a device. The work done by the fluid is 480kJ/kg and the heat loss due to radiation is 30kJ/Kg. The exit condition of the fluid is 120kPa, 0.85m3/kg, and 350m/s. Determine the change in internal energy per unit mass.
Air is compressed in a cylinder polytropically from an initial temperature and pressureof 84°F and 16 psia to a final of 290°F and 78 psia. The cylinder contains 0.015 lb of air,and has a piston area of 0.18 sq ft. Sketch the process on P - v and T – s coordinates andfind the work done, ft.lbfA. (-)648.41 (on) B. (-)850.85 (on) C. (-)950.85 (on) D. (+)648.41 (by)
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An adiabatic capillary tube is used in some refrigeration systems to drop the pressure of the refrigerant from the condenser level to the evaporator level. The R-134a enters the capillary tube as a saturated liquid at 50°C and leaves at -22.00°C. Determine the quality of the refrigerant at the inlet of the evaporator. Use data from the tables. (Round the final answer to three decimal places.) The quality of the refrigerant is
A fluid at 690 kPa has a specific volume of 0.25 m³/kg and enters an apparatus with a velocity of 15 m/s. Heat radiation losses in the apparatus are equal to 25 kJ/kg of fluid supplied. The fluid leaves the apparatus at 135 kPa with a specific volume of 0.9 m³/kg and a velocity of 300 m/s. In the apparatus, the shaft work done by the fluid is equal to 900 kJ/kg. Does the internal energy of the fluid increase or decrease, and how much is the change?A. 858 kJ/kg (increase)B. 858 kJ/kg (decrease)C. 908 kJ/kg (increase)D. 908 kJ/kg (decrease)

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