Engineering, 09.09.2020 22:01 ItsNataly101
The early steam engines were driven by the atmosphericpressure
acting on the piston fitted into a cylinder filled withsaturated
steam. A vacuum was created in the cylinder by coolingthe cylinder
externally with cold water, and thus condensing thesteam.
Consider a piston-cylinder devise with a piston surface areaof
0.1m2 initially with 0.05m3 of saturatedsteam
at the atmospheric pressure of 100kPa. Now cold water ispoured
outside the cylinder, and the steam inside starts tocondensing as a
result of heat transfer to the cooling wateroutside. If the piston
is stuck at its initial position, determinethe friction force
acting on the piston, and the amount of heattransfer when the
temperature inside the cylinder drops to30oC.
Answers: 1
Engineering, 04.07.2019 18:10
Calculate the bore of a cylinder that has a stroke of 18 inches and an extension time of 6 seconds at a flow rate of 4 gal/min.
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Engineering, 04.07.2019 18:20
A2-m rigid tank initially contains saturated water vapor at 100 kpa. the tank is connected to a supply line through a valve. steam is flowing in the supply line at 600 kpa and 300 c. the valve is opened, and steam is allowed to enter the tank until the pressure in the tank reaches the line pressure, at which point the valve is closed. a thermometer placed in the tank indicates that the temperature at the final state is 200°c. determine (a) the mass of steam that has entered the tank (b) the amount of heat transfer.
Answers: 3
Engineering, 04.07.2019 19:10
For a process taking place in a closed system containing gas, the volume and pressure relationship is pvi-constant. -1.5 bar, the process starts with initial conditions, pi = =0.03 m3 and ends with final volume, v2-0.05 m3 determine the work done by the gas.
Answers: 2
Engineering, 04.07.2019 19:20
Apiping systems consists of 6 m of 6-std type k and 12 m of 4-std type k, both drawn copper tubing. the system conveys ethylene glycol at a rate of 0.013 m3/s. the pressure drop across the system is to be calculated. there are two 90° elbows in the 6-in pipe, a reduction from the 6-in pipe to the 4-in pipe and four 90° elbows in the 4-in pipe. all fittings are soldered (same as flanged) and regular. the inlet and outlet of the system are at the same height.
Answers: 1
The early steam engines were driven by the atmosphericpressure
acting on the piston fitted into a c...
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