FUNDAMENTALS OF THERMODYNAMICS
10th Edition
ISBN: 9781119634928
Author: Borgnakke
Publisher: WILEY
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2. If 0.17 kg/s of air are compressed isothermally from Pi = 96 kPaa and V, = 0.13
m/s to p2 = 620 kPaa, find the work, the change of entropy, and heat for: a) a
nonflow process, and b) a steady flow process with V1 = 15 m/s and V2 = 60
%3D
%3D
m/s.
1. A closed tank, V = 10 L, containing 5 kg of water initially at 25 °C, is heated to 150 ° C by a heat
pump that is receiving heat from the surroundings at 25 ° C. Assume that this process is reversible.
Find the heat transfer to the water and its change in entropy.
Thermodynamics
There is a rigid tank initially with water in a
critical state, which after a heat transfer
process reaches a pressure of 1 psia. The
surrounding temperature is 1540°F. Find the
total entropy change. Please draw a scheme.
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- Number 4arrow_forwardGiven 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.arrow_forwardSteam 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_forward
- The subject is Thermodynamics 1 Processes of Ideal Gasesarrow_forward3. An adiabatic compressor takes argon from 100 kPa, 300 K to 2000 kPa. The compressor efficiency is 80%. (a) Find the outlet temperature (K) and the work (kJ/kg) (b) Find the entropy generation (kJ/kg-K)arrow_forward7. If 10 kg/min of air are compressed isothermally from = 96 kPa and V, = 7.65 m/min to p, = 620 kPa, find the work, the change of entropy and the heat for (a) nonflow process and b) a steady flow process with v, = 15 m/s and v, = 60 m/s. Ans. (a)-1370KJ/min,-5.356 kJ/K.min; (b)-1386.9kJ, %3D minarrow_forward
- 20. If 10 kg/min of air are compressed isothermally from P1 = 96 kPa and Vi 7.65 m³/min to P2 = 620 kPa, find the work, change in entropy %3D for a non-flow process and a steady flow process with vị = 15 m/s and v2 = 60 m/s.arrow_forward40°C 4. A mixing chamber receives 5 kg/min of ammonia as saturated liquid at -20°C from one line (1) and ammonia at 40°C, 250 kPa from another line (2). The chamber also receives 325 kJ/min of energy as heat transferred from a 40°C reservoir as shown in figure. At the outlet, ammonia leaves as saturated vapor at -20°C. Find the mass flow rate in second line and calculate the total entropy generation in the process. Is this process possible?arrow_forwardQ10) One kg of an ideal gas is compressed isothermally at 400K from 100 kPa to 1000kPa in a piston cylinder arrange, calculate the entropy change of the gas, the entropy change of the surroundings and the total change in entropy if, a- the process is mechanically reversible b- the process is reversible and the surroundings consist of heat sink at 300K ,c- the process is mechanically irreversible requiring 20% more work than the mechanically reversible compression and the surroundings consist of heat sink reservoir at 300K. Take R=0.287.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_forwardHelium is compressed through a compressor steadily. At the inlet the pressure is and the temperature is . At the exit the pressure is and the temperature is . The power input is and the heat loss rate is during this process. Neglect the kinetic and potential energy changes. Assume helium is ideal gas with a constant specific heat and its specific heat ratio , which means that enthalpy can be calculated using . Calculate the work per unit mass _________arrow_forwardA small turbine, shown in Fig. P 4.48, is operated at part load by throttling a 0.25 kg/s steam supply at 1.4 MPa, 250°C down to 1.1 MPa before it enters the turbine and the exhaust is at 10 kPa. If the turbine produces 110 kW, find the exhaust temperature (and quality if saturated). 우~8arrow_forward
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