Q: Oxygen enters an insulated 12-cm-diameter pipe with a
Oxygen enters an insulated 12-cm-diameter pipe with a velocity of 70 m/s. At the pipe entrance, the oxygen is at 240 kPa and 20°C, and at the exit it is at 200 kPa and 18°C. Calculate the rate at whic...
See AnswerQ: Water at 20 psia and 50°F enters a mixing chamber
Water at 20 psia and 50°F enters a mixing chamber at a rate of 300 lbm/min where it is mixed steadily with steam entering at 20 psia and 240°F. The mixture leaves the chamber at...
See AnswerQ: Cold water (cp = 4.18 kJ/kg⋅°
Cold water (cp = 4.18 kJ/kg⋅°C) leading to a shower enters a well-insulated, thin-walled, double pipe, counterflow heat exchanger at 10°C at a rate of 0.95 kg/s...
See AnswerQ: Air (cp = 1.005 kJ/kg·°C
Air (cp = 1.005 kJ/kg·°C) is to be preheated by hot exhaust gases in a crossflow heat exchanger before it enters the furnace. Air enters the heat exchanger at 95 kPa and 20°C at a rate of 1.6 m3/s. Th...
See AnswerQ: In a dairy plant, milk at 4°C is pasteurized
In a dairy plant, milk at 4°C is pasteurized continuously at 72°C at a rate of 12 L/s for 24 hours a day and 365 days a year. The milk is heated to the pasteurizing temperature b...
See AnswerQ: A glass tube is attached to a water pipe, as shown
A glass tube is attached to a water pipe, as shown in Fig. P2–78. If the water pressure at the bottom of the tube is 107 kPa and the local atmospheric pressure is 99 kPa, determine h...
See AnswerQ: Steam is to be condensed in the condenser of a steam power
Steam is to be condensed in the condenser of a steam power plant at a temperature of 60°C with cooling water from a nearby lake, which enters the tubes of the condenser at 18°C at a rate of 75 kg/s an...
See AnswerQ: An ordinary egg can be approximated as a 5.5-
An ordinary egg can be approximated as a 5.5-cm-diameter sphere. The egg is initially at a uniform temperature of 8°C and is dropped into boiling water at 97°C. Taking the proper...
See AnswerQ: During a heat transfer process, the entropy of a system (
During a heat transfer process, the entropy of a system (always, sometimes, never) increases.
See AnswerQ: Chickens with an average mass of 2.2 kg and average
Chickens with an average mass of 2.2 kg and average specific heat of 3.54 kJ/kg·°C are to be cooled by chilled water that enters a continuous-flow-type immersion chiller at 0.5°C and leaves at 2.5°C....
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