FUNDAMENTALS OF THERMODYNAMICS
10th Edition
ISBN: 9781119634928
Author: Borgnakke
Publisher: WILEY
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Question 3:
Superheated steam enters a turbine at 7 MPa, 550°C, and exits at 150kPa
a. Draw the system.
b. If the process is reversible adiabatic (isentropic), find the final temperature (T2), the
final enthalpy (h2,) of the steam, and do the energy balance to calculate the turbine
work (Wts).
c. Using entropy balance, show that Sgen for the above process is 0.
d. If the isentropic efficiency is 85%, find the actual final temperature (T23)
and calculate Sgen?
e. Plot process in (b) and (d) on a Ts diagram with proper labelling.
A steam with a quality of 49%, enters an adiabatic nozzle at 3.5 MPa and leaves at 0.4
MPa and 140
oC with a flow of 7 m/s. Find the entrance velocity, in m/s.
An adiabatic turbine has an efficiency of 90%. If air is compressed from 1100kpa and 227 degree Celsius to 101kpa. Find the work done and final temperature. Sketch process on T-S diagram.
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- Water Vapor pressure 8 MPa and 350 in an adiabatic turbineIt enters at a temperature of oC and at a pressure of 750 kPacomes out. Reversible The amount of work done by the unit mass of steam for the processcalculate.arrow_forwardPlease be very detailedarrow_forward9. An air compressor takes in air at 105 Pa and 27°C having volume of 1.5 m3/kg and compresses it to 4.5×105 Pa. Find the work done, heat transfer and change in internal energy if the compression is isothermal.arrow_forward
- Number 4arrow_forwardAir enters an insulated compressor at ambient conditions, 100 kPa, 20 oC at the rate of 0.2 kg/s and exits at 500 K. The isentropic efficiency of the compressor is 70%. What is the exit pressure? How much power is required to drive the compressor? Assume specific heats at room temperatures.arrow_forwardone kg of air is compressed in a cylinder according to the law PV^1.3= constant. If intital temperature is 100°C amd compression ratio is 15, find the work done and change in entropy of air.arrow_forward
- 9. Helium is compressed in an adiabatic cylinder from 70°F, 10 ft³, 15 psia to 1 ft³ according to the relation pVK = c. Find the work nonflow, the final temperature and the change of enthalpy.arrow_forwardA compressor has R-134a entering at 10°C, 100 kPa and exiting as a saturated vapor. It is given that this particular compressor also involves heat loss (i.e., this compressor, in a non-typical fashion, has a non- zero q; i.e., you cannot neglect q for this compressor). If the compressor operates in a reversible isothermal manner, find the specific heat transfer and specific work.arrow_forwardThermodynamics sketch and label the turbine. Sketch and label the process on a T-s diagram also mentions all numbers on the process please. Thanks 7.56 A steam turbine has an inlet of 2 kg/s water at 1000 kPa, 400°C with velocity of 15 m/s. The exit is at 100 kPa, 150°C and very low velocity. Find the power produced and the rate of entropy generation.arrow_forward
- 4. Air at a temperature of 500 0C is compressed at a constant pressure of 1.2MPa from a volume of 2 m3 to a volume of 0.4m3 . If the initial internal energy decrease is 4820 KJ, find a. The work done during the reversible compression b. The heat transferred c. The change of enthalpy d. The average specific heat at constant pressurearrow_forwardan air flow is brought from 20 degree celsius, 100 kPa to 1000 kPa, 330 degree celsius by an adiabatic compressor driven by 50 kW motor. what are the mass flow rate and the exit volume flow rate of air?arrow_forwardProvide the solution and diagram. A 120 tons refrigeration system with COP of 5 has a condenser which is to be cooled by means of a cooling tower. Air enters the tower at 25 oC db and 50% RH and leaves at 35 oC db and 80% RH. Find the volume of air needed m3/hr. At 25oC and 50% RH: h = 50 KJ/kg, v = 0.86 m3/kg At 350C db and 80% RH: h = 108 A. 7.51 m3/s B. 2.34 m3/s C. 4.98 m3/s D. 3.16 m3/sarrow_forward
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