Tarik Al-Shemmeri. Engineering Thermodynamics (776123), страница 11
Текст из файла (страница 11)
Steam (0.05 kg) initially saturated liquid, is heated at constant pressure of 0.2 MPa until itsvolume becomes 0.0658 m3. Calculate the heat supplied during the process.[Ans: 128.355 kJ]12. Steam at 0.6 MPa and dryness fraction of 0.9 expands in a cylinder behind a pistonisentropically to a pressure of 0.1 MPa. Calculate the changes in volume, enthalpy andtemperature during the process.[Ans: 1.1075 m3, -276 kJ/kg, -59oC]13. The pressure in a steam main pipe is 1.2 MPa; a sample is drawn off and throttled where itspressure and temperature become 0.1 MPa, 140oC respectively.
Determine the drynessfraction of the steam in the main stating reasonable assumptions made![Ans: 0.986, assuming constant enthalpy]Download free ebooks at bookboon.com1064. Thermodynamics Tutorial problemsEngineering Thermodynamics14. A boiler receives feed water at 20 kPa as saturated liquid and delivers steam at 2 MPa and500oC. If the furnace of this boiler is oil fired, the calorific value of oil being 42000 kJ/kgdetermine the efficiency of the combustion when 4.2 tonnes of oil was required to process42000 kg of steam.[Ans: 96%]15. 10 kg/s steam at 6 MPa and 500oC, expands isentropically in a turbine to a pressure of 100kPa. If the heat transfer from the casing to surroundings represents 1 per cent of the overallchange of enthalpy of the steam, calculate the power output of the turbine. Assume exit is 5m above entry and that initial velocity of steam is 100 m/s whereas exit velocity is 10 m/s.[Ans: 96%]Please click the advertdongenergy.com/jobMay we offer you oneof the world’s greatestchallenges?In all humility.We are looking for highlyeducated engineers andfinance students.Join us at dongenergy.com/job107.
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