Chapter 8, Problem 8.15P

Two reversible cycles are in series, each process doing the same net work, Wcycle. The first cycle receives energy QH by heat transfer from a hot reservoir at 1000°R and energy Q is reinjected by heat transfer to a reservoir at an intermediate temperature, T. The second cycle receives energy Q by heat transfer from the reservoir at temperature T and reinjects the QC energy by heat transfer to the reservoir at a temperature of 400°R. All energy transferred is positive in the direction of the arrow. Determine: a) the intermediate temperature T, in °R, and the thermal efficiency for each of the two cycles; b) the thermal efficiency of a simple reversible cycle operating between the hot and cold reservoirs at 1000°R and 400°C, respectively. Then determine the net work done by the simple cycle, expressed in terms of the net work done by each of the two cycles, Wcycle.

Consider a heat transfer process of the steady form that occurs along a plain wall. While the inner room temperature was kept at 25 °C, the outdoor environment temperature was measured to be 2 °C. If the heat transfer at this plain wall in an hour is 3,528 kJ, determine the.total exergy destruction per unit time (the rate), which occurs during this heat transfer process, a) use the total entropy generation to find the rate of the total exergy destruction in the room (i.e.., use the entropy balance), b) use the exergy balance to find the rate of the total exergy destruction in the room

How reversible process differs from irreversible process?

Air is heated at constant pressure from 2 7 degrees C to 57 degrees C at 3 bar in a heater from an infinite heat source at temperature 227 degrees C Find the gain in availability of air and the effectiveness of the heater. Assume To = 280K and Cp =1.0 kj/kgK.

An internally reversible process occurs in a system during which Q = – 12 KJ, AU = – 79 KJ and Ah = - 111 KJ A. Find the work if the system is non- flow. B. Determine the work and the change of flow energy if the system is steady state, steady flow system with AEK 4 KJ. %3D

i need the answer quickly

Define the Exergy Transfer by Mass, m.

A fluid at 0.6 bar occupying 0.07 m is compressed reversibly to a pressure of 10.2 bar and specific volume of 07 m/kg according to the law pv =c. The fluid then expands reversibly according to the law py =c to 1.9 bar A reversible cooling at constant volume then restores the fluid back to initial state Calculate the net work for the process in Joules.

Provide complete solution and detailed diagram.  Find the work needed to isothermally compress 200 m3/min of air from 100 kpa to 700 kpa. A. 294 kw         B. 385 kw         C. 456 kw            D. 649 kw