Fundamentals Of Thermodynamics
10th Edition
ISBN: 9781119494966
Author: Borgnakke, C. (claus), Sonntag, Richard Edwin, Author.
Publisher: Wiley,
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Chapter 4, Problem 4.38P
An exhaust fan in a building should be able to move
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A pump is used to raise the pressure of water from 0 psig to 55 psia. How much power (in kW) will be required to pump 1.5ft3/s of water? What is the effect of the water temperature on the pump power that is required?
a. Sketch the problem.
b.Draw lines identifying the control volume, or control mass.
c.Identify the states with numbers, letters, or descriptions such as “in” and “out”.
d.Write down the knowns and unknowns.
e.Identify what is being asked for.
f.State all assumptions.
For the air compressor shown in Figure below, the air enters from a large area and
exit from small one, explain why?
3. The power requirement of a fan in kW in order to supply air at a rate of 500m3/h at a total discharge pressure of 0.5psia
in kW is
Chapter 4 Solutions
Fundamentals Of Thermodynamics
Ch. 4 - A temperature difference drives a heat transfer...Ch. 4 - What is the effect can be felt upstream in a flow?Ch. 4 - Prob. 4.3PCh. 4 - Air at 500 kPa is expanded to l00 kPa in two...Ch. 4 - A windmill takes out a fraction of the wind...Ch. 4 - An underwater turbine extracts a fraction of the...Ch. 4 - A liquid water turbine at the bottom of a dam...Ch. 4 - You blow a balloon up with air. What kinds of work...Ch. 4 - Storage tanks of cryogenic liquids (O2,N2,CH4) are...Ch. 4 - A large brewery has a pipe of cross-sectional area...
Ch. 4 - A pool is to be filled with 60m3 water from a...Ch. 4 - Natural gas, CH4 , flowing in a 5cm -diameter pipe...Ch. 4 - A boiler receives a constant flow of 5000kg/h...Ch. 4 - A 0.6m -diameter household fan takes air in at...Ch. 4 - Liquid water at 15°C flows out of nozzle straight...Ch. 4 - A nozzle receives an ideal gas flow with a...Ch. 4 - In a jet engine a flow afar at 1000K,200kPa, and...Ch. 4 - The wind is blowing horizontally at 30m/s in a...Ch. 4 - A meteorite hits the upper atmosphere at 3000m/s ,...Ch. 4 - Carbon dioxide is throttled from 20C,2000kPa to...Ch. 4 - Saturated liquid R-410A at 25°C is throttled to...Ch. 4 - Carbon dioxide used as a natural refrigerant flows...Ch. 4 - Liquid water at 180C,2000kPa is throttled into a...Ch. 4 - Methane at 1MPa,250K is throttled through a valve...Ch. 4 - A steam turbine has an n1et of 3kg/s water at 1200...Ch. 4 - Air at 20m/s,1500K,875kPa with 5kg/s flows into a...Ch. 4 - Solve the previous problem using Table A.7.Ch. 4 - A wind turbine can extract at most a fraction...Ch. 4 - A liquid water turbine receives 2kg/s water at...Ch. 4 - A small high-speed turbine operating on compressed...Ch. 4 - Hoover Dam across the Colorado River dams up Lake...Ch. 4 - What is the specific work one can get from Hoover...Ch. 4 - R-410A in a commercial refrigerator flows into the...Ch. 4 - A compressor brings nitrogen from 100kPa,290K to...Ch. 4 - A refrigerator uses the natural refrigerant carbon...Ch. 4 - A factory generates compressed air from l00kPa,17C...Ch. 4 - A compressor brings R-134a from...Ch. 4 - An exhaust fan in a building should be able to...Ch. 4 - Prob. 4.39PCh. 4 - The air conditioner in a house or a car has a...Ch. 4 - A boiler section boils 3kg/s saturated liquid...Ch. 4 - A superheater takes 3kg/s saturated water vapor in...Ch. 4 - Carbon dioxide enters a steady-state, steady-flow...Ch. 4 - Find the heat transfer in Problem 4.13.Ch. 4 - A chiller cools liquid water for air-conditioning...Ch. 4 - Saturated liquid nitrogen at 600 kPa enters a...Ch. 4 - Prob. 4.47PCh. 4 - Liquid nitrogen at 90K,400kPa flows into a probe...Ch. 4 - Liquid glycol flows around an engine, cooling it...Ch. 4 - An irrigation pump takes water from a river at...Ch. 4 - A pipe from one building to another flows water at...Ch. 4 - A river flowing at 0.5m/s across a 1-m-high and...Ch. 4 - A cutting tool uses a nozzle that generates a...Ch. 4 - An adiabatic steam turbine in a power plant...Ch. 4 - Prob. 4.55PCh. 4 - A steam turbine receives steam from two boilers...Ch. 4 - Prob. 4.57PCh. 4 - Prob. 4.58PCh. 4 - A condenser (heat exchanger) brings 1kg/s water...Ch. 4 - Steam at 500kPa,300C is used to heat cold water at...Ch. 4 - A dual-fluid heat exchanger has 5kg/s water...Ch. 4 - An energy recovery heat exchanger, shown in Fig....Ch. 4 - Do the previous problem if the water is heated to...Ch. 4 - In a co-flowing (same-direction) heat exchanger,...Ch. 4 - An a water counter flowing heat exchanger has one...Ch. 4 - An automotive radiator has glycol at 95°C enter...Ch. 4 - Prob. 4.67PCh. 4 - Two air flows are combined to a single flow. One...Ch. 4 - An open feedwater heater in a power plant heats...Ch. 4 - A de-superheater has a flow of ammonia of 1.5kg/s...Ch. 4 - A mixing chamber with heat transfer receives 2kg/s...Ch. 4 - A geothermal supply of hot water at 500kPa,150C is...Ch. 4 - A flow of 5kg/s water at l00kPa,20C should be...Ch. 4 - A two-stage compressor takes nitrogen ri at...Ch. 4 - The intercooler in the previous problem uses cold...Ch. 4 - Prob. 4.76PCh. 4 - A modern jet engine has a temperature after...Ch. 4 - A proposal is made to use a geothermal supply of...Ch. 4 - Prob. 4.79PCh. 4 - An initially empty canister of volume 0.2m3 is...Ch. 4 - Repeat the previous problem but use the line...Ch. 4 - A tank contains 1m3 air at 100kPa,300K . A pipe...Ch. 4 - A 2.5L tank initially is empty, and we want to...Ch. 4 - An insulated 2m3 tank is to be charged with R-134a...Ch. 4 - Repeat the previous problem if the valve is closed...Ch. 4 - A 3m3 ? cryogenic storage tank contains nitrogen...Ch. 4 - A nitrogen line at 300K,0.5MPa , shown in Fig....Ch. 4 - Prob. 4.88PCh. 4 - A 200L tank (see Fig. P4.89) initially contains...Ch. 4 - A 1-L can of R-410A is at room temperature, 20°C,...Ch. 4 - Steam at 3MPa,400C enters a turbine with a...Ch. 4 - In a glass factory a 2m -wide sheet of glass at...Ch. 4 - Assume a setup similar to that of the previous...Ch. 4 - Three a flows, all at 200 kPa, e connected to the...Ch. 4 - A 1m3,40kg rigid steel tank contains air at 500...Ch. 4 - An insulated spring-loaded piston/cylinder device,...Ch. 4 - A piston/cyl. setup like Fig. 4.96 is such that at...Ch. 4 - A mass-loaded piston/cylinder shown in Fig. P4.98,...Ch. 4 - A flow of 2kg/s of water at 500kPa,20C is heated...Ch. 4 - Refrigerant R-410A at l00psia,60F flows at...Ch. 4 - A pool is to be filled with 2500ft3 water from a...Ch. 4 - Liquid water at 60 F flows out of a nozzle...Ch. 4 - Prob. 4.103EPCh. 4 - Prob. 4.104EPCh. 4 - Nitrogen gas flows into a convergent nozzle at...Ch. 4 - A meteorite hits the upper atmosphere at 10000ft/s...Ch. 4 - Refrigerant R-410A flows out of a cooler at...Ch. 4 - Saturated vapor R-410A at 75 psia is throttled to...Ch. 4 - A wind turbine can exact at most a fraction 16/27...Ch. 4 - A liquid water turbine receives 4Ibm/s water at...Ch. 4 - Prob. 4.111EPCh. 4 - What is the specific work one can get from Hoover...Ch. 4 - A small-speed turbine operating on compressed air...Ch. 4 - R.410A in a commercial refigerator flows into the...Ch. 4 - An exhaust fan in a building should be able to...Ch. 4 - Carbon dioxide gas enters a steady-state,...Ch. 4 - Prob. 4.117EPCh. 4 - Liquid glycol flows around an engine, cooling t as...Ch. 4 - Prob. 4.119EPCh. 4 - Prob. 4.120EPCh. 4 - Do the previous problem if the water is just...Ch. 4 - A dual-fluid heat exchanger has l0Ibm/s water...Ch. 4 - Steam at 80psia,600F is used to heat cold water at...Ch. 4 - Prob. 4.124EPCh. 4 - Two flows of air are both at 30 psia one has...Ch. 4 - A de-superheater has a flow of ammonia of 3Ibm/s...Ch. 4 - A two-stage compressor takes nitrogen n at...Ch. 4 - The intercooler in the previous problem uses cold...Ch. 4 - Prob. 4.129EPCh. 4 - Prob. 4.130EPCh. 4 - A tank contains l0ft3 of air at 15psia,540R . A...Ch. 4 - Prob. 4.132EPCh. 4 - In a glass factory a 6 ft-wide sheet of glass at...Ch. 4 - A mass-loaded piston/cylinder containing air is at...
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- Steam enters a turbine 80 lb of steam per minute with an enthalpy of 2171 BTU/lb and velocity of 125 fps. It leaves the turbine at 1520 BTU/lb at 589 fps. The heat loss is 90,000 BTU/hr. Find the horsepower output of the turbine.arrow_forwardDoes a turbine in an aero engine have stators and rotors?arrow_forwardA centrifugal air compressor handles 200 cfm from 12 psia to 90 psia. The initial specific volume is 12.6 cu ft/ lb and the final specific volume is 3.25 cu ft/lb. If the inlet suction line is 4-in ID and the discharge line is 2.5-in ID, determine (a) the change in flow energy between the boundaries, ft-lb/min, (b) the mass rate of flow, lb/min, and the (c) change in velocity. (draw a diagram)arrow_forward
- 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).arrow_forward17. A fully inflated tire has a volume of 15 ft3. The pressure and temperature of theair in the tire are 65 psia and 75 F, respectively. At this condition, the air intakeneedle is depressed for 3 s and then released. Treating air as an ideal gas and assumingsmall changes in the tire temperature and volume, Find the amount of air that leftthe tire. Assume a discharge coefficient of 0.61 and a flow area of 0.01 in2.arrow_forwardA centrifugal air compressor compresses 200 cfm from 12 psia to 90 psia. The initial specific volume is 12.6 ft3/lb and the final specific volume is 3.25 ft3/lb. If the inlet suction line is 4 in. ID and the discharge line is 2.5 in. ID, determine (a) the change in flow work between the boundaries, ft-lb/min; (b) the mass rate of flow, lb/min; and (c) the change in velocity. Answer: (a) 324,000, (b) 15.88, (c) -12.9 fpsarrow_forward
- A nozzle is a device for increasing the velocity of a steadily flowing stream of fluid, At the inlet to a certain nozzle the enthalpy of the fluid is 3025 kJ/kg and the velocity is 60m's. At the exit from the nozzle the enthalpy is 2790 kJ/kg. The nozzle is horizontal and there is negligible heat loss from it. (a) Find the velocity at the nozzle exit. (b) If the inlet area is 0.1 m’and the specific volume at the inlet is 0.19 m²/kg, find the rate of flow of fluid (C) If the specific volume at the nozzle exit is 0.5 m kg, find the exit area of the nozzle. Dr. Hameed J. Khalaf Subject Lecturearrow_forward4. An open system has a mass flow rate of 1 kg/s the enthalpy, velocity, height of entry are: 232 KJ/kg, 91 m/s, and 98m. At exit these quantities are: 230 KJkg, 15 m/s, 3.35m. If the heat received by the system is 10 KJ/s. What is the work done by the system per minute?arrow_forwardA centrifugal pump uses a 134767 rpm motor to pump 116334 kg/min of standard temperature water and has a pressure rise from 2 bar to 38 bar using a 0.11 cm diameter impeller. The Inlet diameter is 0.39 cm and the outlet diameter is 0.18 cm. The inlet and outlet are at the same level with each other. What will be your water power (in kW)? ?arrow_forward
- 2) In a steady flow of air through a nozzle, the enthalpy decreases by 40 kj. Assuming there is no other energy changes other than KE det the velocity at sec 2, if the vel at sec 1 is 100 m/sarrow_forwardA pump delivers 4 ?3/??? of water from 110 kPa to 350 kPa. Both pipes’ gages are on the same level. The inlet and the outlet pipe diameters are 16 cm and 13 cm respectively. The inlet and outlet temperature are both 25 deg C and the mass density of water is 997 ??/?3. Calculate the pump work in kW. Please answer it with a complete solution thank you.arrow_forwardSolve please, correctlyarrow_forward
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