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A cyclic machine uses a piston-cylinder device (closed system) and an ideal gas as a working fluid. The cycle consists of the following four reversible processes: 1→2 adiabatic expansion 2→3 constant-pressure heat addition 3→4 adiabatic compression 4→1 constant-temperature heat rejection (a) Sketch the T-S and P-V diagrams for this ideal gas cycle. Please indicate the different states with the numbers 1-4 on both diagrams. (b) For the working fluid as a system, determine if the quantities in the following table are positive, negative, zero or if we cannot say a priori. That is, fill in the table with +, -, 0, or ? ?T ?P ?V Q ?S W ?U 1→2 2→3 3→4 4→1 (c) Assume the above cycle is performed by 2 kg of an ideal gas with R = 287 J/kg-K and cv = 718 J/kg-K. The initial temperature and pressure are T1 = 300 K and P1 = 1 MPa, respectively. The lowest pressure in the cycle is P2 = 0.1 MPa and the temperature T3 = 280 K. Determine the values of ?T, ?P, ?V, Q, ?S, W and ?U for each process in the cycle, and also calculate the coefficient of performance assuming the cycle is used as a refrigerator.
Find the maximum height above the starting point attained by the body and the time taken to reach that height. Show also that the speed of the body when it returns to its starting point is uV/(V2 + u2)½.
1-2 an actual refrigerator absorbs 500 kj of heat from a sink at 250 k and reject 660 kj of heat to environment at 300
Derive the plant model for an automatic transmission system. Design a state space controller with state feedback based on the performance objectiveof minimizing the peak shift jerk.
the spring-loaded piston-cylinder device is filled with 0.5 kg of water vapor that is initially at 4 mpa and 400oc.
Application: Detection of faults in buried lines. A buried cable has been cut at an unknown point. A signal generator is connected to the cable input and the frequency is swept.
a frac12 -in-diameter unf sae grade 5.2 bolt with rolled threads is preloaded to 80 of its proof load when clamping a
Determine the mass flow rate of air through the engine and Complete the table with flow areas, static pressures, static temperatures, and velocities
a building for which the heat transfer rate through the walls and roof is 1400 btuh per degree temperature difference
A lever of negligible weight is loosely fitted onto a 75-mm-diameter fixed shaft. It is observed that the lever will just start rotating if a 3-kg mass is added at C. Determine the coefficient of static friction between the shaft and the lever.
What is the conceptual difference between the (1) percentage of credit sales and (2) aging methods of estimating bad debts?
A sailing enthusiast is seeking materials for lightweight panels to use in a sea-going yacht. The panels are of rectangular cross-section and will be loaded in bending, as shown in Figure 1. The span L and width b of the panels are fixed, but the thi..
Fish swimming above a dam may be up to 260 feet beneath the surface of the lake. What ambient pressure change would a fish experience if it was pulled up to a boat? Calculate in kPa and in atm.
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