Chapter 8, Problem 8.59P

Helium at 660 K expands in a turbine to 369 K during which 84 kJ/kg of heat was lost to the surroundings which are at 27 oC. The pressure across the turbine was 6.0, What is the isentropic efficiency "%"?

Please be very detailed

Problem 4.01. A carnot refrigerator (carnot cycle heat pump in reverse) operating between Th and Te is used to cool and freeze a bottle of water, volume V, at a temperature To < Th to freezing temperature T (known density Pw, heat capacity cw). (a) Find the work required to cool and freeze the water. (b) Find the change in entropy in the heat baths, and use it to place a limit on the change in entropy of the water (without calculating the entropy change in the water). The C.O.P. of a carnot refrigerator: KR= Qc = W Te Th-Te

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

A condenser (heat exchanger) brings 1 kg/s water flow at 10 kPa quality 95% to saturated liquid at 10 kPa. The cooling is done by lake water at 20 degree Celsius that returns to the lake at 30 degree Celsius. For an insulated condenser, find the flow rate of cooling water.

Steam to a turbine at a mass flow rate of 1.4 kg/s, 700 kPa pressure and 400 °C enters the temperature. Steam at 100 kPa pressure and 1.4 m3/kg specific volume exits the turbine. Heat transfer from turbine to environment 50 kW, with turbine Since the boundary temperature between the environment is 70 °C, a) Find the power produced by the turbine, entropy produced in the turbine and isentropic efficiency of the turbine. Note: The changes in kinetic and potential energies will be neglected and T (K) = 273 + °C will be taken.

Ao air turbine with one intet and one exit operates at Steady State, and has heat trans fer to the Surroundings at an average 3.0x' 10" J per ka of air flowing. The inlet conditions are 980°K and 400 kPa, and the exit conditions are 670°k and 100 kla. Neglect kinetic and potential energy e ffects and use the ideal gas madel without assumung constant specific heats, to calculate the entropy producHon per mass of air flowing. Pres ent your answer in kJ/ (kgʻk) wsing 5 Signifigant figures. outer surface temperature of 315°k ät the rate of

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A fluid at 0.8 bar occupying 0.06 m is compressed reversibly to a pressure of 113 bar and specific volume of 0.3 m/kg according to the low p/ c The fluid then expands reversibly according to the law pv to 14 bar Arevertable coolmg at constant volume then restores the fluid back to Initial state. Calculate the work for the expansion in the process in Joules