1.A fan is to be selected to ventilate a bathroom whosedimensions are 2 m x 3 m x 3 m. The air velocity is not toexceed 7 m/s to minimize vibration and noise. The combinedefficiency of the fan-motor unit to be used can be taken tobe 50 percent. If the fan is to replace the entire volume of airin 15 min, determine (a) the wattage of the fan-motor unit tobe purchased, (b) the diameter of the fan casing, and (c) thepressure difference across the fan. Take the air density to be1.25 kg/m and disregard the effect of the kinetic energy cor-rection factors.7 m/s- ExhaustfanAir

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Answered: A fan is to be selected to ventilate a…

Structural Analysis

6th Edition

ISBN:9781337630931

Author:KASSIMALI, Aslam.

Publisher:KASSIMALI, Aslam.

Chapter2: Loads On Structures

Section: Chapter Questions

Problem 1P

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1. A pump must be selected to deliver water to a tank that is 9m above a sump. The system to which the pump will be connected consists of a pipe 100m long and 100mm diameter with an f value of 0.006. Determine the pump that will require the least energy per unit volume in J/m³ to deliver water to the tank. (19mks) Q (m³/s) 0 0.01 0.015 0.02 0.025 0.03 Ha (m) 22.6 20.8 19.1 16.7 13.5 9.6 na (%) 0 59 72 80 79 74 13.2 12.7 12.1 11.4 10.4 9 Hb (m) ŋb (%) 0 42 60 74 80 77
Air with a mass flow rate of 5 kg/s enters a horizontal nozzle operating at steady state at 450 K, 350 kPa, and velocity of 3 m/s. The nozzle is well insulated. At the exit, pressure is 300 kPa and temperature is 390 K. Using the ideal gas model for air, the area at the inlet is m², and the velocity at the outlet is Are potential effects negligible? Why? m/s. Is heat transfer negligible? Why? Note that you may choose to model the specific heat as constant.
Current Attempt in Progress A small electric immersion heater is used to heat 71 g of water for a cup of instant coffee. The heater is labeled “63 watts" (it converts electrical energy to thermal energy at this rate). Calculate the time required to bring all this water from 19°C to 100°C, ignoring any heat losses. (The specific heat of water is 4186 J/kg-K.) 17h pros Number i Units
The system presented on Figure 1 pumps water from the left reservoir to ensure a water in the elevated basin stays level. Knowing that the offset from water-surface to water-surface 7.5m and the water temperature is 5oC, you must: a) Determine the out-flow from the basin's orifice; b) Determine the efficiency of the pump (n) feeding the basin if the pump's absorbed power is 2550W; Consider that hs=0 c) Determine how long it will take for the basin to fully empty if the pump ceases to function. Lconduit 20m; Chw-130; D=0.15m 1m h Dorifice =0.075m; h=1.2m; Dimension of the rectangular basin: 3m x 2m *The orifice coefficient can be presumed to be 0.9 Figure 1
11 Estimate the kilowatt pump you would need to pump 450 Liter/min of liquid water at 20 °C through a rise in elevation °C of 100 m. Assume the water is pumped adiabatically and with negligible changes in temperature and kinetic energy. [ans: -7.355 kW]
Argon gas flows through a well-insulated nozzle at steady state. The temperature and velocity at the inlet are 570°R and 150 ft/s, respectively. At the exit, the temperature is 460°R and the pressure is 40 lb/in². The area of the exit is 0.0085 ft². Use the ideal gas model with k = 1.67, and neglect potential energy effects. Determine the velocity at the exit, in ft/s, and the mass flow rate, in lb/s.
Water at 50°F is pumped from a lake at 750 gpm through a length of 3-inch schedule 40 commercial steel pipe as shown below. The inlet to the pipe is eight feet below the surface of the lake. A 25-HP gasoline engine drives the pump and the pump has an efficiency of 80% What is the Reynolds number in the pipe? Is the flow laminar or turbulent? What is the head added to the water by the pump? What is the head loss due to pipe friction?
Hello, I have an equalization tank with the following dimensions: Height: 5.15 meters Length: 10.3 meters Width: 30.48 meters Total volume calculated: 1616.8116 m³ How can I calculate the air requirement for the tank? The flow rate is 2.5 MGD.
Part 1 Part 2 Part 3 hp A centrifugal pump having a 7.5-in-diameter impeller and the characteristics shown in the figure below is to be used to pump gasoline through 4000 ft of commercial steel 3-in.-diameter pipe. The pipe connects two reservoirs having open surfaces at the same elevation. Determine the flowrate. Do you think this pump is a good choice? This figure is referred to as the pump performance characteristics. 500 8 in. dia 400 7 出300 6 Head, ft 200 100 65 60 55 50 40 bhp 30 25 20 80 ° 40 120 160 200 240 280 320 Capacity, gal/min Write the system equation for this flow system as function of the friction factor f and volume flowrate Q in gal/min. (Use 2 significant digits on coefficients. Do not enter units as a part of your response.)
A centrifugal pump is driven by a motor. The performance of the pump reveals the following information:Power input to the pump by the motor (kW):0.5, 0.7, 0.9, 1.0, 1.2Power input to the fluid by the pump (kW):0.3, 0.55, 0.7, 0.9, 1.0Plot the efficiency curve. The efficiency of a pump is a function of the flow rate. Assume that the flow-rate readings corresponding to power data points are equally spaced.
An insulated piston-cylinder device contains 4 L of saturated liquid water at a constant pressure of 200 kPa. Water is stirred by a paddle wheel while a current of 8A flows for 50 min through a resistor placed in the water. If one-half of the liquid is evaporated during this constant-pressure process and the paddle-wheel work amounts to 300 kJ, determine the voltage of the source. Also, show the process on a P-v diagram with respect to the saturation lines.

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