Introduction to Chemical Engineering Thermodynamics
8th Edition
ISBN: 9781259696527
Author: J.M. Smith Termodinamica en ingenieria quimica, Hendrick C Van Ness, Michael Abbott, Mark Swihart
Publisher: McGraw-Hill Education
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What is the thermochemical equation of the Hydrogen combines with oxygen in fuel cells to produce steam. It releases heat energy of 571.7 kJ per mole of oxygen gas.
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- Formaldehyde at 52.688 bar and 175.65 ℃ passes through a heater-expander and emerges at 39.516 bar and 420.45 ℃. There is no work into or out of the heater, but heat is supplied. Calculate the heat transfer into the heater-expander per mole of formaldehydearrow_forwardIn a stirred tank with 3000 kg of oil at 22°C, 650 kg/h of oil enters at 220°C and 650 kg/ha leaves at 500°C. Calculate the time needed if the heating of the oil is done with saturated steam that condenses in the heating jacket of the tank and gives out 150 kW. The specific heat of the oil is 2.5 kj/kg°C.arrow_forward1. (a) Hot oil at a flow rate of 5.5 kg/s (average cp = 1.92 kJ/kgK) enters an existing counter-flow exchanger at 435 K and is cooled by water entering at 325 K (under pressure) and flowing at a rate of 7.2 kg/s and the water exit temperature is 350 K. The overall heat transfer coefficient based on the outside area is 685 W/m²K (Average specific heat of water is 4.187 kJ/kgK). (i) Calculate the exit oil temperature. (ii) Calculate the heat transfer area. (b) The fluid in (a) enters an existing co-current-flow exchanger at the same conditions. (i) Calculate the heat transfer area. (ii) Explain the performance of both heat exchangers.arrow_forward
- Please show the outright and legible answers/solutions. Thermodynamics Ideal Gas Sulphur dioxide is circulated as refrigerant in a small refrigerator. SO2 gas at a pressure of 5 bar and temperature 340 K is to be cooled at a constant volume of 0.142 m3, to 293 K as part of the refrigeration cycle. Calculate (a) The heat liberated, (b) The work done by the gas on cooling, (c) The final pressure attained on cooling and(d) The change in enthalpy.Sulphur dioxide may be treated as an ideal gas. The specific heat (J/mol K) is found to vary with temperature (K) according toCP = 25.736 + 5.796 X 10-2 T – 3.8112 x 10-5 T2 + 8.612 x 10-9 T3arrow_forwardSteam expands in a turbine from 6 MPa and 500°C to 0.2 MPa and 150°C at a rate of 1.2 kg/s.Heat is lost from the turbine at a rate of 34 kJ/s during the process. Find the power output of theturbine.arrow_forwardThe figure below is the basic plot of pressure vs. volume for the Dual Standard Cycle. Constant pressure heat addition 3 4 = constant Нeat IN Adiabatic expansion Heat OUT (Constant volume heat rejection) Constant volume heat addition Adiabatic compression Volume (V) Using the Dual Air Standard Cycle and the following data: Assume constant properties of air. R= 287 J/kgK; Cp = 1005 J/kgK; Cv = 718 J/kgK;y = 1.4 Cycle compression ratio = 11 (v1/v2) Air conditions prior to compression: Pressure = 1.6 bar; Temperature = 298K Heat added at constant volume = 290000 J/kg Heat added at constant pressure = 579000 J/kg a) Calculate the pressure at the end of the compression process. P2 = bar Pressure (P) LOarrow_forward
- calculate the heat required to raise the temperature of 1 mol of methane from 260 to 600 °c in steady flow process at a pressure sufficient low that methane may be considered an ideal gasarrow_forwardes Hot exhaust gases of an internal combustion engine are to be used to produce saturated water vapor at 2 MPa pressure. The exhaust gases enter the heat exchanger at 400°C at a rate of 32 kg/min while water enters at 15°C. The heat exchanger is not well insulated, and it is estimated that 10 percent of heat given up by the exhaust gases is lost to the surroundings. If the mass flow rate of the exhaust gases is 15 times that of the water, determine the temperature of the exhaust gases at the heat exchanger exit and the rate of heat transfer to the water. Use the constant specific heat properties of air for the exhaust gases. The constant pressure specific heat of the exhaust gases is taken to be cp = 1.045 kJ/kg-°C. The inlet and exit enthalpies of water are 62.98 kJ/kg and 2798.3 kJ/kg. Exhaust 400 C 2 MPa sal- vap. 0 Heat exchanger Water 15 0 The temperature of the exhaust gases is The rate of heat transfer is KW. °C. 4arrow_forward2arrow_forward
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