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3.70 Referring to Fig. P3.70, water contained in a piston- cylinder assembly, initially at 1.5 bar and a quality of 20%, is heated at constant pressure until the piston hits the stops. Heating then continues until the water is saturated vapor. Show the processes of the water in series on a sketch of the T-y diagram. For the overall process of the water, evaluate the work and heat transfer, each in kJ/kg. Kinetic and potential effects are negligible.
3.71 A piston-cylinder assembly contains 2 lb of water, initially at 300°F. The water undergoes two processes in series: constant-volume heating followed by a constant-pressure process. At the end of the constant-volume process, the pressure is 100 lbf/in.2 and the water is a two-phase, liquid- vapor mixture with a quality of 80%. At the end of the constant-pressure process, the temperature is 400°F. Neglect kinetic and potential energy effects.
(a) Sketch T-y and p-y diagrams showing key states and the processes.
(b) Determine the work and heat transfer for each of the two processes, all in Btu.
A transmission tower is held by three guy wires anchored by bolts at B, C, and D. If the tension in wire AB is 2100 N, determine the components of the force exerted by the wire on the bolt at B.
A large manufacturing space with an average floor to ceiling height of 30 ft has a floor area of 5000 ft^2. The total infiltration rate for the space is estimated to be 1.5 air changes per hour. The inside design temperature and relative humidity are..
two carts a and b are moving in a straight line with velocities v and 2v respectively. the length of each of the carts
A simple ideal Rankine cycle with water as the working fluid operates between the pressure limits of 15 MPa in the boiler and 100 kPa in the condenser. Saturated steam vapor enters the turbine. Determine the work produced by the turbine, the heat tra..
hydrogen h2 at 2.28 atm and 400 degrees f enters an insulated turbine operating at steady state and expands to 1 atm.
Air flows into the atmosphere from a nozzle and strikes a vertical plate as shown in Fig. A horizontal force of 9 N is required to hold the plate in place. Determine the velocity at the exit, V1, and the velocity within the pipe, V2.
Given the melting point of steel to be approximately 1500C, how much energy is required to melt a cubic inch from room temperature? How much water would this amount of energy raise by 10oC from room temperature?
air in a piston-cylinder assembly undergoes a process from state 1 where t1 300 k p1 100 kpa to state 2 where t2500 k
two refrigerators are arranged in series. one of them receives 300 kjcycle from a reservoir at 300 k. the heat
write a reflective assessment of how you rate yourself against these competencies and Describe the main learning outcomes that this course and the EWB project have generated for you over the semester. Have any of these learning outcomes been a ..
The maximum thermal efficiency of any power cycle operating between hot and cold thermal reservoirs at 10008C and 5008C, respectively, is 50%.
two 20mm steel plates are welded to a rolled S section as shown. Determine the moments of inertia and the radii of gyration of the combined section with respect to the centroidal x and y axes.
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