Problem 4.1P: A temperature difference drives a heat transfer Does a similar concept apply to m ? Problem 4.2P: What is the effect can be felt upstream in a flow? Problem 4.3P Problem 4.4P: Air at 500 kPa is expanded to l00 kPa in two steady-flow cases. Case one is a nozzle and case two is... Problem 4.5P: A windmill takes out a fraction of the wind kinetic energy as power on a shaft. How do the... Problem 4.6P: An underwater turbine extracts a fraction of the kinetic energy from the ocean current. How do the... Problem 4.7P: A liquid water turbine at the bottom of a dam takes energy out as power on a shaft. Which term(s) in... Problem 4.8P: You blow a balloon up with air. What kinds of work terms, including flow work, do you see in that... Problem 4.9P: Storage tanks of cryogenic liquids (O2,N2,CH4) are very cold so they are well insulated but some... Problem 4.10P: A large brewery has a pipe of cross-sectional area 0.2m2 flowing carbon dioxide at 1000kPa,0C with a... Problem 4.11P: A pool is to be filled with 60m3 water from a garden hose of 2.5cm diameter flowing water at 2m/s .... Problem 4.12P: Natural gas, CH4 , flowing in a 5cm -diameter pipe at 15C and 200kPa at the rate of 0.05kg/s ,... Problem 4.13P: A boiler receives a constant flow of 5000kg/h liquid water at 5 MPa and 20°C, and it heats the flow... Problem 4.14P: A 0.6m -diameter household fan takes air in at 98kPa,20C and delivers it at 105kPa,20.4C with a... Problem 4.15P: Liquid water at 15°C flows out of nozzle straight up 15m . What is nozzle Vexit . and the specific... Problem 4.16P: A nozzle receives an ideal gas flow with a velocity of 25m/s , and the exit at l00kPa,300K velocity... Problem 4.17P: In a jet engine a flow afar at 1000K,200kPa, and 30m/s enters a nozzle, as shown in FigP4.17, where... Problem 4.18P: The wind is blowing horizontally at 30m/s in a storm at P0,20C toward a wall, where it comes to a... Problem 4.19P: A meteorite hits the upper atmosphere at 3000m/s , where the pressure is 0.1 atm and the temperature... Problem 4.20P: Carbon dioxide is throttled from 20C,2000kPa to 800kPa . Find the exit temperature, assuming ideal... Problem 4.21P: Saturated liquid R-410A at 25°C is throttled to 400kPa in a refrigerator. What is the exit... Problem 4.22P: Carbon dioxide used as a natural refrigerant flows out of a cooler at 10MPa,40C , after which it is... Problem 4.23P: Liquid water at 180C,2000kPa is throttled into a flash evaporator chamber having a pressure of 500... Problem 4.24P: Methane at 1MPa,250K is throttled through a valve to l00 kPa. Assume no change in the kinetic... Problem 4.25P: A steam turbine has an n1et of 3kg/s water at 1200 kPa and 350°C with a velocity of 15m/s . The exit... Problem 4.26P: Air at 20m/s,1500K,875kPa with 5kg/s flows into a turbine and it flows out at 25m/s,850K,105kPa .... Problem 4.27P: Solve the previous problem using Table A.7. Problem 4.28P: A wind turbine can extract at most a fraction 16/27 of the wind kinetic energy. With a rotor... Problem 4.29P: A liquid water turbine receives 2kg/s water at 2000kPa,20C with a velocity of 15m/s . The exit is at... Problem 4.30P: A small high-speed turbine operating on compressed air produces a power output of 100 W. The inlet... Problem 4.31P: Hoover Dam across the Colorado River dams up Lake Mead 200m higher than the river downstream (see... Problem 4.32P: What is the specific work one can get from Hoover Dam now that the water level is down to 160 m... Problem 4.33P: R-410A in a commercial refrigerator flows into the compressor at 25C and x=1 . The exit is at 1200... Problem 4.34P: A compressor brings nitrogen from 100kPa,290K to 2000kPa . The process has a specific work input of... Problem 4.35P: A refrigerator uses the natural refrigerant carbon dioxide where the compressor brings 0.02kg/s from... Problem 4.36P: A factory generates compressed air from l00kPa,17C by compression to 800kPa,500K , after which it... Problem 4.37P: A compressor brings R-134a from 150kPa,10Cto1200kPa,50C . It is water cooled, with heat loss... Problem 4.38P: An exhaust fan in a building should be able to move 3kg/s atmospheric pressure air at 25°C through a... Problem 4.39P Problem 4.40P: The air conditioner in a house or a car has a cooler that brings atmospheric air from 30Cto10C ,... Problem 4.41P: A boiler section boils 3kg/s saturated liquid water at 2000 kPa to saturated vapor in a reversible... Problem 4.42P: A superheater takes 3kg/s saturated water vapor in and heats it at 2000kPato350C . Find the specific... Problem 4.43P: Carbon dioxide enters a steady-state, steady-flow heater at 300kPa,300K and exits at 275kPa,1500K .... Problem 4.44P: Find the heat transfer in Problem 4.13. Problem 4.45P: A chiller cools liquid water for air-conditioning purposes. Assume that 2.5kg/s water at 20C,l00kPa... Problem 4.46P: Saturated liquid nitrogen at 600 kPa enters a boiler at a rate of 0.008kg/s and exits as saturated... Problem 4.47P Problem 4.48P: Liquid nitrogen at 90K,400kPa flows into a probe used in a cryogenic surgery. In the return line the... Problem 4.49P: Liquid glycol flows around an engine, cooling it as it absorbs energy. The glycol enters the engine... Problem 4.50P: An irrigation pump takes water from a river at 10C,100kPa and pumps it up to an open canal, where it... Problem 4.51P: A pipe from one building to another flows water at 10°C from one building to another. In the winter... Problem 4.52P: A river flowing at 0.5m/s across a 1-m-high and 10-m-wide area has a clam that creates an elevation... Problem 4.53P: A cutting tool uses a nozzle that generates a high-speed jet of liquid water. Assume an exit... Problem 4.54P: An adiabatic steam turbine in a power plant receives 5kg/s steam at 3000kPa,500C . Twenty percent of... Problem 4.55P Problem 4.56P: A steam turbine receives steam from two boilers (see Fig. P4.56). One flow is 5kgsat3MPa,700C and... Problem 4.57P Problem 4.58P Problem 4.59P: A condenser (heat exchanger) brings 1kg/s water flow at 10 kPa quality 95 to saturated liquid at 10... Problem 4.60P: Steam at 500kPa,300C is used to heat cold water at 15°C to 75°C for a domestic hot water supply. How... Problem 4.61P: A dual-fluid heat exchanger has 5kg/s water entering at 40C,150kPa and leaving at 10C,150kPa . The... Problem 4.62P: An energy recovery heat exchanger, shown in Fig. P4.62, is used to heat water flow at... Problem 4.63P: Do the previous problem if the water is heated to the boiling point at 200 kPa. Problem 4.64P: In a co-flowing (same-direction) heat exchanger, 1kg/s air at 500 K flows into one channel and 2kg/s... Problem 4.65P: An a water counter flowing heat exchanger has one line with 2kg/s at 125kPa,1000K entering, and the... Problem 4.66P: An automotive radiator has glycol at 95°C enter and return at 55°C as shown in Fig P4.66. Air flows... Problem 4.67P Problem 4.68P: Two air flows are combined to a single flow. One flow is 1m3/sat20C and the other is 2m3/s at 200°C,... Problem 4.69P: An open feedwater heater in a power plant heats 4kg/s water at 45C,l00kPa by mixing it with steam... Problem 4.70P: A de-superheater has a flow of ammonia of 1.5kg/s at 1000kPa,100C that is mixed with another flow of... Problem 4.71P: A mixing chamber with heat transfer receives 2kg/s of R410A , at 1MPa40C in one line and 1kg/s of... Problem 4.72P: A geothermal supply of hot water at 500kPa,150C is fed to an insulated flash evaporator at the rate... Problem 4.73P: A flow of 5kg/s water at l00kPa,20C should be delivered as steam at 1000kPa,350C to some... Problem 4.74P: A two-stage compressor takes nitrogen ri at 20C,150kPa and compresses it to 600kPa,450K . Then it... Problem 4.75P: The intercooler in the previous problem uses cold liquid water to cool the nitrogen. The nitrogen... Problem 4.76P Problem 4.77P: A modern jet engine has a temperature after combustions of about 1500K at 3200kPa as it enters the... Problem 4.78P: A proposal is made to use a geothermal supply of hot water to operate a steam turbine, as shown in... Problem 4.79P Problem 4.80P: An initially empty canister of volume 0.2m3 is filled with carbon dioxide from a line at 800kPa,400K... Problem 4.81P: Repeat the previous problem but use the line condition at 800kPa,20C and Table B.3 to solve it. Problem 4.82P: A tank contains 1m3 air at 100kPa,300K . A pipe flowing at 1000kPa,300K is connected to the tank and... Problem 4.83P: A 2.5L tank initially is empty, and we want to fill it with l0 g of ammonia. The ammonia comes from... Problem 4.84P: An insulated 2m3 tank is to be charged with R-134a from a line flowing the refrigerant at 3MPa,90C .... Problem 4.85P: Repeat the previous problem if the valve is closed when the tank reaches 2 MPa. Problem 4.86P: A 3m3 ? cryogenic storage tank contains nitrogen at 120 K, with quality 20 . Saturated vapor is now... Problem 4.87P: A nitrogen line at 300K,0.5MPa , shown in Fig. P4.87, is connected to a turbine that exhausts to a... Problem 4.88P Problem 4.89P: A 200L tank (see Fig. P4.89) initially contains water at 100 kPa and a quality of 1 . Heat is... Problem 4.90P: A 1-L can of R-410A is at room temperature, 20°C, with a quality of 50°C. A leak in the top valve... Problem 4.91P: Steam at 3MPa,400C enters a turbine with a volume-flow rate of 5m3/s . An extraction of 15% of the... Problem 4.92P: In a glass factory a 2m -wide sheet of glass at 1500 K comes out of the final rollers, which fix the... Problem 4.93P: Assume a setup similar to that of the previous problem, but with the air flowing in the opposite... Problem 4.94P: Three a flows, all at 200 kPa, e connected to the same exit duct and mix thought external heat... Problem 4.95P: A 1m3,40kg rigid steel tank contains air at 500 kPa, and both tank and air are at 20°C. The tank is... Problem 4.96P: An insulated spring-loaded piston/cylinder device, shown in Fig. P4.96, is connected to an air line... Problem 4.97P: A piston/cyl. setup like Fig. 4.96 is such that at V=0 the spring is relaxed and at V=100cm3 the... Problem 4.98P: A mass-loaded piston/cylinder shown in Fig. P4.98, containing : is at 300kPa,17C with a volume of... Problem 4.99P: A flow of 2kg/s of water at 500kPa,20C is heated in a constant-pressure process to 1900 K Find the... Problem 4.100EP: Refrigerant R-410A at l00psia,60F flows at 0.1lbm/s in a 2.5ft2 cross-sectional area pipe. Find the... Problem 4.101EP: A pool is to be filled with 2500ft3 water from a garden hose of 1 in. diameter flowing water at... Problem 4.102EP: Liquid water at 60 F flows out of a nozzle straight up 40 ft. What is the nozzle Vexit and the... Problem 4.103EP Problem 4.104EP Problem 4.105EP: Nitrogen gas flows into a convergent nozzle at 30Ibf/in.2,600R and very low velocity. It flows out... Problem 4.106EP: A meteorite hits the upper atmosphere at 10000ft/s where the pressure is 0.1 atm and temperature 40F... Problem 4.107EP: Refrigerant R-410A flows out of a cooler at 70F,220psia , after which it is throttled to 77 psia.... Problem 4.108EP: Saturated vapor R-410A at 75 psia is throttled to 15 psia. What is the exit temperature7 Repeat the... Problem 4.109EP: A wind turbine can exact at most a fraction 16/27 of the wind kinetic energy. With a rotor diameter... Problem 4.110EP: A liquid water turbine receives 4Ibm/s water at 300psia,77F with a velocity of 50ft/s . The exit is... Problem 4.111EP Problem 4.112EP: What is the specific work one can get from Hoover Darn now that the water level is down to 480 ft... Problem 4.113EP: A small-speed turbine operating on compressed air produces a power output of 0.1 hp The inlet state... Problem 4.114EP: R.410A in a commercial refigerator flows into the compressor l0F and x=1 . The exits at 400psia,180F... Problem 4.115EP: An exhaust fan in a building should be able to move 6Ibm/s of air at 14.4psia,68F through a... Problem 4.116EP: Carbon dioxide gas enters a steady-state, steady-flow heater at 45Ibf/in2,60F and exits at... Problem 4.117EP Problem 4.118EP: Liquid glycol flows around an engine, cooling t as it absorbs energy. The glycol enters the engine... Problem 4.119EP Problem 4.120EP Problem 4.121EP: Do the previous problem if the water is just heated to the boiling point at 60 psia. Problem 4.122EP: A dual-fluid heat exchanger has l0Ibm/s water entering at l00F,20psia and leaving at 50F,20psia .... Problem 4.123EP: Steam at 80psia,600F is used to heat cold water at 60 F to 170 F for a domestic hot water supply.... Problem 4.124EP Problem 4.125EP: Two flows of air are both at 30 psia one has 1Ibm/s at 720 R and the other has 2Ibm/s at 520 R. The... Problem 4.126EP: A de-superheater has a flow of ammonia of 3Ibm/s at 150psia,200F that is mixed with another flow of... Problem 4.127EP: A two-stage compressor takes nitrogen n at 80F,20psia and compresses it to 80psia,800R . Then it... Problem 4.128EP: The intercooler in the previous problem uses cold liquid water to cool the nitrogen. The nitrogen... Problem 4.129EP Problem 4.130EP Problem 4.131EP: A tank contains l0ft3 of air at 15psia,540R . A pipe of flowing air at l50psia,540R is connected to... Problem 4.132EP Problem 4.133EP: In a glass factory a 6 ft-wide sheet of glass at 2700 R comes out of the final rollers, which fix... Problem 4.134EP: A mass-loaded piston/cylinder containing air is at 45lbf/in2,60F with a volume of 9ft3 , while at... format_list_bulleted
Refrigeration and Air Conditioning Technology (Mi...Mechanical EngineeringISBN:9781305578296Author:John Tomczyk, Eugene Silberstein, Bill Whitman, Bill JohnsonPublisher:Cengage Learning