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An air heater for an industrial application consists of an insulated, concentric tube annulus, for which air flows through a thin-walled inner tube. Saturated steam flows through the outer annulus, and condensation of the steam maintains a uniform temperature Ts on the tube surface.
Consider conditions for which air enters a 50-mm-diameter tube at a pressure of 5 atm, a temperature of Tm,i; = 17°C, and a flow rate of m = 0.03 kg/s, while saturated steam at 2.455 bars condenses on the outer surface of the tube. If the length of the annulus is L = 5 m, what are the outlet temperature Tm,o and pressure Po of the air? What is the mass rate at which condensate leaves the annulus?
a cylindrical bar of radius 15 mm and length 100 mm is held at both ends. if at 30degc no axial force exists in the bar
Compare the time and cost of using the following three alternative methods for casting the concrete for the wall: 1) direct chute 2) pumped 3) crane and bucket.
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a truck travels on a level roadway. after traveling initially at 65 mph the brakes are applied so all tires are on the
Consider 0.8 grams of air (which may be assumed to be an ideal gas) at 295 K and 1.5 bar trapped in a rigid tank. An electrical heater is operated for 30 seconds. During this time the voltage across the heater is 12 V and 0.6 amps pass through the re..
a thermodynamic system undergoes a cycle composed of a series of three processes for q1 10 kj q2 30 kj q3 -5 kj. for
A new motorcycle is being developed to meet new gas mileage standards recently passed by the federal government. An engineer tested three model designs by randomly assigning the motorcycles in a blind study (the riders recorded the mileage but did no..
A rigid container with volume V is originally filled with water of Temperature T1. A hose is then connected to an inlet port and hotter water of temperature T2 is pumped into the container at mass flow rate m in., while another venting port allows th..
The device is used to hold an elevator door open. If the spring has a stiffness of k = 50N/m and it is compressed 0.17m, determine the horizontal and vertical components of reaction at the pin A and the resultant force at the wheel bearing B.
problem a compound cylinder is composed of a tube of 250mm internal diameter at 25mm wall thickness. it is shrunk on to
water is the working fluid in a regenerative rankine cycle with one closed feedwater heater and one open feedwater
the wing is supported by a strut be with ball-and-socket joints at b and e and by bearings at a and f. the bearings
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