Chapter 8, Problem 8.129EP

9 In a constant temperature, transferred to the working fluid at 80F. What is the change of entropy of the working fluid, KJ/kg-K? closed system process, 120 BTU of heat is 10 1ne in -rease of certain is 141 KJ/ka when the gas

2000 kg cast iron hoisin at 350 degree Celsius is quenched in 4000 kg of water at 15 degree Celsius. Find the amount of heat transferred to the water bath, entropy change for water and cast iron, use the entropy generation to prove that the entire system does not violate the second law of thermodynamics. Water specific heat of 4.18kj/kg.k, cast iron specific heat of 0.42kj/kg.k

I was getting 35.4 but correct answer is 0.228. please help me to solve it

A steam turbine receives 0.52 MPa of steam at 300 C. Then expand in an irreversible adiabatic process to a pressure of 0.012 MPa. If the exhaust steam is dry and saturated, calculate:a. The work of an irreversible processb. The efficiency of the process.

Given 0.603MW electrical power supplied to a boiler when the temperature of the entering water is 20 C and the exiting temperature is 89 C. The flow of.the pressured water is 2 Kg/s. There is a negligible pressure drop through this boiler and it operates at a constant pressure of 3 bars. The specific heat is c = 4,370 J/(Kg K).  a) Calculate the total rate of entropy production b) Calculate the total rate of exergy destruction (W). The dead state temperature is 293.2 K and pressure is 1 bar. c) Calculate the mass flowrate of fuel (natural gas, CH4) required to heat the water flow to the conditions of the problem if the electrical heating device is replaced with a gas fired boiler. The high heating value (HHV) of the fuel is 50.02 MJ/kg.

Steam at 5.2 MPa, 4000C expands in a Rankine turbine to 0.036MPa. For 136 kg/s of steam, determine the work, the thermal efficiency, and the steam rate (a) fot the cycle(b) for the turbine, (c) for an actual turbine with the same specifications, the brake steam rate is 4.80 kg/kwh ang the driven electric generator has an efficiency of 93%, Find brake thermal efficiency , brake engine efficiency, combined work, and quality or temperature of exhaust steam. Don't answer the given problem, just give me the schematic diagram and T-S diagram of the given problem

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Problem 4: In the pump of a steam power plant, saturated liquid at 75 kPa pressure is compressed to 3 MPa pressure. Since the adiabatic efficiency of the pump is 85%, find the work consumed by the pump.

Example 8.5. Heat flows from a hot reservoir at 800 K to another reservoir at 250 K. H entropy change of the overall process is 4.25 kJ/K, make calculations for the heat flowinger of the high temperature reservoir.