Chapter 5, Problem 5.101EP

Discuss the importance of reversible processes. Says in engineering practice. Briefly discuss the major factors that irreversibility.

(15%) A small expander (a turbine with heat transfer) has 0.05 kg/s helium entering at 1000 kPa, 550 K and leaving at 250 kPa, 300 K. The power output on the shaft measures 55 kW. Find the rate of heat transfer, neglecting kinetic energies.

5.49 Air in a piston/cylinder goes through a Carnot cycle with the P-v diagram shown in Fig. 5.21. The high and low temperatures are 600 K and 300 K, respectively. The heat added at the high temperature is 250 kJ/kg, and the lowest pressure in the cycle is 75 kPa. Find the specific volume and pressure after heat rejection and the net work per unit mass.

150 kJ of work is done in a rigid container while the internal energy increases by 95 kJ. Find the heat transfer, in kJ.

Q5: A. An engine transfers 1.5 * 103 J of energy from a hot reservoir during a cycle and transfers 1 * 103 J as exhaust to a cold reservoir.(a) Find the efficiency of the engine.(b) How much work does this engine do in one cycle?

If Malaysia could not sustain in oil and natural gas production, how the renewable energy can help to generate power into the hydropower plant system? Please justifyyour answer with the suitable system and analyze your example with assumptions.

From the turbine the heat loss per kg of steam flow rate is 5 kW. Find the power developed in kW by the steam turbine per kg of steam flow rate?

A certain SSSF turbine (irreversible and adiabatic) operates on air with the following conditions, Inflow: Ti=1000 K, Pi = 13223.07354 kPa Outflow (actual): Te = 402.3904382 K Find the actual specific work output of the turbine, wt in KJ/kg. (Assume single inflow/outflow, neglect change in KE and PE. Assume constant specific heats in this problem, with Cp0 =1.004 kJ/(K*kg) and k= 1.4. Next if the hypothetical ideal, reversible adiabatic (isentropic) specific work output of the turbine is wt= +800 Kj/kg: Find the isentropic efficiency of the turbine, outflow pressure Pe in kPa and finally what is the ratio of the outflow pressure of the actual turbine to the same pressure for the ideal turbine.