Determine the quantity of air the fan must provide

Assignment Help Mechanical Engineering
Reference no: EM132280174

Questions -

Q1. An exhaust ventilation system is shown in Figure below. The head losses given are based on the assigned air quantities, and the shaft dimensions are 10 x 7.5 ft (3.05 x 2.29 m). Determine the quantity of air the fan must provide. Locate regulators where needed, specifying the amount of regulation at each. Find the mine heads and the air power.

1136_figure.png

Q2. In the exhaust ventilation system shown in the following figure, determine all of the missing quantities for individual segments of airway; locate regulators where needed and calculate the amount of regulation needed. Determine the static head for each of the two fans. Also, determine the size of the regulator to be placed across the heading containing Q12.

1898_figure1.png

Q3. A temperature survey of a mine is made to investigate the natural ventilation. The data obtained are indicated in the figure below. The friction factor is 100 x 10-10 lb.min2/ft4 (0.01855 kg/m3), all airways are 10 x 10 ft (3.05 x 3.05 m), and the elevation of the collar of the higher shaft is 5000 ft (1524 m). Disregarding the shock losses and the velocity head, compute the natural ventilation head, and the quantity of flow and air power on the basis of the most reliable calculated head. Indicate the direction of flow and sketch the characteristic curve of the system.

799_figure2.png

Q4. The following data are obtained during a test of a vane-axial mine fan:

Static Head in. (kPa)

Quantity cfm ( m3/s)

Power Input Bhp (kW)

8.00 (1.99)

0          (0)

37.6 (28.0)

7.65 (1.90)

5,000   (2.36)

35.5 (26.5)

6.00 (1.49)

12,500 (5.90)

24.0 (17.9)

6.65 (1.65)

16,000 (7.55)

25.5 (19.0)

6.10 (1.52)

20,000 (9.44)

25.0 (18.6)

3.70 (0.92)

25,000 (11.80)

21.0 (15.7)

0        (0)

28,600 (13.50)

13.0 (9.7)

The fan has a diameter of 38 in. (965 mm) and a speed of 1750 rpm, and the air specific weight is 0.075 lb/ft3 (1.20 kg/m3). Plot characteristic curves of the fan for quantity versus static and total heads, power input, static and total air power, and static and total efficiency. Tabulate all data used in plotting curves.

Reference no: EM132280174

Compressed isobaric ally until its volume is two-thirds

Ten pounds-mass of R-22 is at an initial volume of 4.059 ft3 and pressure of 200 psia. It is compressed isobaric ally until its volume is two-thirds of its initial volume. The

Carbon monoxide gas undergoes a constant-pressure process

In a cryogenic application, carbon monoxide (CO) gas undergoes a constant-pressure process at 1000 lbf/in^2. In a piston-cylinder assembly from T1=-100F to T2=-30F Determine t

What is the average actual power produced by a turbine

What is the average actual power produced by a turbine of this type at this wind speed? (Hint: Find Cp)Hint: Find the maximum power coefficient, Cp, based on the following equ

How much heat is rejected to the cooling system

steam with 88.6% quality and a flow rate of 750 kg/s enters a condenser operating @ 75 KPa. Saturated liquid leaves the condenser. How much heat is rejected to the cooling s

Calculate the error between the actual value

Calculate the estimated energy available in the wind using the average wind speed and the Rayleigh function. For bin 16, assume an average wind speed of 16 m/s. Calculate th

Satisfy the smoothness requirements at the transition points

Assume lift L = 1 cm. Satisfy the smoothness requirements at the transition points (boundaries), and the equality of displacements at the inflection points. Plot the displac

Interpret the industry project and define parameters

Ability to apply knowledge and skills that you have learnt; correct work methods and best practice using a variety of industry standard software to generate required outcome

Find an expression for the thrust produced by engine

Assuming that the jet accelerates the air to a speed vrel relative to the jet's center of mass G, draw a control volume and find an expression for the thrust produced by the e

Reviews

Write a Review

 
Free Assignment Quote

Assured A++ Grade

Get guaranteed satisfaction & time on delivery in every assignment order you paid with us! We ensure premium quality solution document along with free turntin report!

All rights reserved! Copyrights ©2019-2020 ExpertsMind IT Educational Pvt Ltd