Applied Fluid Mechanics (7th Edition)
7th Edition
ISBN: 9780133494839
Author: Mott
Publisher: PEARSON
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Chapter 18, Problem 18.31PP
To determine
The specific weight of refrigerant at both conditions.
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The power requirement of a 3-stage compressor (in kW, two decimal places) in order to supply air at 20 degrees celcius at a rate of 250 cubic meter per hour at a total discharge pressure of 100 psig is ___________. If the efficiency of the compressor is 60%.
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The temperature of the air in a balloon is 20 °C and the pressure is 220 kPa. Since the volume of the balloon is 0.030 m3, what will the pressure in the balloon be when the air temperature rises to 40 °C? Calculate how much air must be expelled to restore the pressure at this temperature? Note: Atmospheric pressure is 99,632 kPa. Rair=0.287 kJ/kgK, the volume of the balloon is constant throughout the entire procedure. If it is to be initialized, P2=P1 can be accepted.
An air compressor delivers 10 ft3of air at a pressure of 130 psia and 85°F into an air reservoir.Calculate the mass of air delivered (lbm).
Chapter 18 Solutions
Applied Fluid Mechanics (7th Edition)
Ch. 18 - A pipe in a compressed air system is carrying 2650...Ch. 18 - Prob. 18.2PPCh. 18 - Prob. 18.3PPCh. 18 - A duct in a heating system carries 8320 cfm....Ch. 18 - The velocity of flow in a ventilation duct is 1140...Ch. 18 - Prob. 18.6PPCh. 18 - Prob. 18.7PPCh. 18 - Prob. 18.8PPCh. 18 - Prob. 18.9PPCh. 18 - Prob. 18.10PP
Ch. 18 - Prob. 18.11PPCh. 18 - Describe a centrifugal fan with forward-curved...Ch. 18 - Prob. 18.13PPCh. 18 - Prob. 18.14PPCh. 18 - Name four types of positive-displacement...Ch. 18 - Name a type of compressor often used for pneumatic...Ch. 18 - Prob. 18.17PPCh. 18 - Prob. 18.18PPCh. 18 - Prob. 18.19PPCh. 18 - Compute the specific weight of nitrogen at 32...Ch. 18 - Compute the specific weight of air at 1260...Ch. 18 - Prob. 18.22PPCh. 18 - An air compressor delivers 820 cfm of free air....Ch. 18 - Prob. 18.24PPCh. 18 - Prob. 18.25PPCh. 18 - Prob. 18.26PPCh. 18 - Specify a size of Schedule 40 steel pipe suitable...Ch. 18 - For an aeration process, a sewage treatment plant...Ch. 18 - Prob. 18.29PPCh. 18 - Prob. 18.30PPCh. 18 - Prob. 18.31PPCh. 18 - Prob. 18.32PPCh. 18 - Prob. 18.33PPCh. 18 - Prob. 18.34PPCh. 18 - Prob. 18.35PPCh. 18 - Figure 18.14 iD shows a two-compartment vessel....Ch. 18 - Prob. 18.37PPCh. 18 - Prob. 18.38PPCh. 18 - Prob. 18.39PPCh. 18 - A tank of Refrigerant is at 150 kPa gage and 20C....Ch. 18 - Prob. 18.41PP
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- 5. An air receiver of volume 6 m3 contains air at 15 bar and 40.5°C. A valve is opened and some air is allowed to blow out to atmosphere. The pressure of the air in the receiver drops rapidly to 12 bar when the valve is then closed. Calculate the mass of air which has left the receiver.arrow_forwardA motorist equips his automobile tires with a relief type valve so that the pressure inside the tire never will exceed 240 kpa gage. He starts the trip with a pressure of 200 kPa gage and a temperature of 23oC in the tires. During the long drive, the temperature of the air in the tires reaches 83oC in the tires. Each tires contains 0.11kg of air. Determine (a) the mass of air escaping each tire (b) pressure of the tire when the temperature returns to 23oC. Show Illustrationarrow_forward7. An air bubble rises from the bottom of the well where the temperature is 20°C to the surface where the temperature is 50°C. If the existing atmospheric pressure at the surface of the well water is 101.3kPa, determine the percent increase in volume of the bubble if the pressure in the bottom of the well is 200kPag. Draw a figure or FBD that will support the problem. Explain each step by step formula.arrow_forward
- What horsepower is required to isothermally compress 755 cu.ft. Of air per minute from 14.7 psia to 90 psig? If 1hp = 550ft.lb/sec.arrow_forwardQ2A compressor takes in air at a pressure of 67 kN/m2. The pressure of the air at exit from thecompressor is 167 kN/m2. The mass flow rate and increase in specific enthalpy of the air are0.25 kg/s and 80 J/g respectively. The intake and exit ducts are designed so that the velocitiesof the air equal in both. Calculate the power required to operate the compressor and the ratioof the duct areas inlet to exit. Assume that the compressor casing is adiabatic, gravity terms inthe steady flow energy equation are negligible and the quantity Pv1.3 has the same value atinlet and exit.arrow_forwardA motorist equips his automobile tires with a relief-type valve so that the pressure inside the tire never will exceed 240 kPa(gage). He starts a trip with a pressure of 200 kPa(gage) and a temperature of 23 degree Celcius in the tires. During the long drive, the temperature of the air in the tires reaches 83 degree Celcius. Each tire contains 0.11 kg of air. Determine (a) the mass of air escaping each tire, (b) the pressure of the tire when the temperature returns to 23 degree Celcius. Please indicate all the conversion.arrow_forward
- The energy wasted as compressed air escapes through the leaks is equivalent to the energy it takes to compress it.arrow_forward--SHOW THE ILLUSTRATION AND A COMPLETE SOLUTION--A motorist equips his automobile tires with a relief type valve so that the pressure inside the tire never will exceed 240 kpa gage. He starts the trip with a pressure of 200 kPa gage and a temperature of 23oC in the tires. During the long drive, the temperature of the air in the tires reaches 83oC in the tires. Each tires contains 0.11kg of air. Determine (a) the mass of air escaping each tire (b) pressure of the tire when the temperature returns to 23oC.arrow_forwardA motorist equips her automobile tires with a relief type valve so that the pressure inside the tire never will exceed 242 kPa (gage). She starts a trip with a pressure of 200 kPa (gage) and a temperature of 23°C in the tires. During the long drive the temperature of the air in the tires reaches 80°C. Each tire initially contains 0.11 kg of air. Assuming that the tires are inflexible, determine (a) the masses of air escaping each tire; (b) the pressure inside the tire when the temperature returns to 23°C.arrow_forward
- A rigid tank of 20ft contains air at 100psia and 70°F. The tank is equipped with a relief valve that opens at a pressure of 125psia and remains open until the pressure drops to 120psia. If a fire causes the valve to operate, what is the quantity (Ibm) of air lost due to the fire?arrow_forwardThe water level in a tank is 34 ft above the ground. A hose is connected to the bottom of the tank at the ground level and the nozzle at the end of the hose is pointed straight up. The tank cover is airtight, but the pressure over the water surface is unkown. Determine the minimum tank air pressure (gage) that will cause a water stream from the nozzle to rise 72 ft from the ground. A. 13.5 psi B. 14.4 psi C. 16.5 psi D. 15.5 psi With F.B.D.arrow_forwardI2 4.2, there is friction in the piping, which means that an additional pressure equivalent to a height of 100 m is needed to pump the water from the bottom tank to the top tank. What is the minimum power required when accounting for friction? By what percentage has friction increased the minimum power required? Remember to show your calculations.arrow_forward
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