Fundamentals Of Thermodynamics
10th Edition
ISBN: 9781119494966
Author: Borgnakke, C. (claus), Sonntag, Richard Edwin, Author.
Publisher: Wiley,
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A heat exchanger is used to cool an air flow from 900 to 400 K, with both states at 1 MPa. The coolant is water flow at 20 degrees C and 0.1 MPa. If the water leaves a saturated vapor, find the ratio of the flow rates (mass flowwater/mass flowair.
4. An evaporator has R-410A at -20°C and quality 80% flowing in. The exit flow is saturated vapor at
-20°C.
a. Consider the heating to be a reversible process and find the specific heat transfer from the
entropy balance. (Answer: 48.7 kJ/kg)
b. If the heat source was at -10°C and the inlet and outlet streams still have the same properties as
in a), calculate the specific entropy generation? (Answer: 7.33 J/(kg K))
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- 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.arrow_forwardi need the answer quicklyarrow_forwardA steam is expanded through a nozzle and the enthalphy drop per kg of steam from the initial pressure to the final pressure is 70 kJ. Neglecting the friction, find the velocity of discharge.arrow_forward
- Write down the steady flow energy equation (SFEE) and apply it for boiler, turbine, heat exchanger and pump with P-V, T-S and h-S plot.arrow_forwardThe pressure and temperature entering the turbine is 1800kpaa and 380oC. The temperature leaving the turbine is 20kpa. The quality of steams entering the condenser is 90%. Find the turbine work in kJ/kg.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
- an 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_forwardRefrigerant R-410a inters a refrigerator compressor at a pressure of 150 kPa, -10 c° and leaves at 1200 kPa, 50 c° with mass flow rate of 3 kg/s. the compressor is water cooled and the heat loss to the water Qloss is 20 kW. Determine the compressor input work W.. Note: Neglect potential and kinetic energy in your calculations. 1 2 CN Compressor coolarrow_forwardA heat exchanger, shown below, is used to cool an air flow from 550 K to 250 K, both states at 1 MPa. The coolant is a water flow at 30 °C, 0.1 MPa. If the water leaves as saturated vapor, 0.1 MPa. 1 air 3 waterarrow_forward
- An amount of 4000 BTU of heat is transferred from a reservoir at 800 deg. F to a reservoir at 200 deg. F. Find the entropy change of the system.arrow_forward4) A boiler generates 600 kg of steam per hour. The enthalpy of feed water s 168 kj/kg and the enthalpy of steam is 2772 kj/kg. Neglecting PE KE cal the rate at which the heat is transferred.arrow_forwardAn 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.arrow_forward
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