Hot nitrogen gas at 400°C and atmospheric pressure flows into a waste-heat boiler at the rate of 20 kg-s-1, and transfers heat to water boiling at 101.33 kPa. The water feed to the boiler is saturated liquid at 101.33 kPa, and it leaves the boiler as superheated steam at 101.33 kPa and 150°C. If the nitrogen is cooled to 170°C and if heat is lost to the surroundings at a rate of 80 kJ for each kilogram of steam generated, what is the steam-generation rate? If the surroundings are at 25°C, what is SG for the process? Assume nitrogen to be an ideal gas for which Cp = (7/2)R.

Ethylene at 30 bar and 100°C passes through a throttling valve and heat exchanger, emerging at 20 bar and 150°C. Assuming that ethylene obeys the Peng-Robinson equation of state, compute the flow of heat (J/mol) into the heat exchanger per mole of ethylene.

A heat exchanger is used to transfer heat from a steam stream to a chlorine gas stream. 100 kg of steam at 1 bar and 200 °C enters the heat exchanger and leaves the exchanger as saturated steam at 1 bar. Chlorine gas enters the exchanger at 1 bar and 48.0 °C and leaves the exchanger at 141.0 °C. Assume the heat exchanger is adiabatic. What is the specific enthalpy of the inlet steam stream? (Use liquid water at 0.01 °C as a reference state.) Ĥ și= kJ/kg What is the specific enthalpy of the outlet steam stream? (Use the same reference state.) 50= kJ/kg What is the specific enthalpy of the inlet chlorine gas stream? (Use chlorine gas at 1 bar and 48.0 °C as a reference state.) Ĥci= kJ/mol What is the specific enthalpy of the outlet chlorine gas stream? (Use chlorine gas at 1 bar and 48.0 °C as a reference state.) ÊĤ co= kJ/mol How many moles of chlorine gas enter the heat exchanger? nc = mol What is the ratio of the volume of inlet steam to the volume of inlet chlorine gas? Use the ideal…

Consider an engine operating on the ideal Otto cycle with a compression ratio of 9.5. At the beginning of the compression process, the air is at 100 kPa and 25°C. During the constant-volume heat-addition process, 850 kJ/kg of heat is transferred to air from a source at 1800K and waste heat is rejected to the surroundings at 290 K. Accounting for the variation of specific heats of air with temperature, determine (a) the thermal efficiency of this cycle, (b) the exergy destruction associated with the heat-addition process, (c) the exergy destruction associated with the heat-rejection process, and (d) the second-law efficiency of this cycle.

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2-Steam initially at 10 bar and 0.25 dryness fraction (i.e quality=85%.). Expands down to P₂= 3.5 bar According to the hyperbolic law. PV=Constant, Determine. 1. The final of the steam. 2- The change of temperature of the steam. 3. The work done kg during the change. 4 The change in internal energy. 5- The amount of heat supplied