EBK FUNDAMENTALS OF THERMODYNAMICS, ENH
9th Edition
ISBN: 9781119321453
Author: Sonntag
Publisher: JOHN WILEY+SONS,INC.-CONSIGNMENT
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Chapter 5, Problem 5.38P
A car engine
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A 5 Hp Carnot engine operates between
temperature limits of 300°C and 50°C. Find the
rate of heat wasted by the engine in kW.
Water vapor enters a turbine at 6 MPa pressure and 800 ° C temperature and leaves at 20 kPa pressure. Since the heat loss from the turbine with an izanopic efficiency of 95% is 49.7 kJ / kg,
a) Find the actual amount of work (kj / kg) produced by the turbine.
b) Find the reversible work (kJ / kg) between the inlet and outlet of the turbine. (Take the ambient temperature 20 ° C.)
Q5/ Air expands at constant pressure from 100 KPa, 0.03 m3 to 0.06 m3 with 80 kJ negative heat transfer. There is no work other than that done on a piston. Find total energy difference for the air. *
Chapter 5 Solutions
EBK FUNDAMENTALS OF THERMODYNAMICS, ENH
Ch. 5 - Prob. 5.1PCh. 5 - A windowmounted air conditioner removes 3.5kJ from...Ch. 5 - Prob. 5.18PCh. 5 - R410A enters the evaporator (the cold beat...Ch. 5 - A large heat pump should upgrade 4MW of heat at...Ch. 5 - A car engine 5g/s fuel (equivalent to addition of...Ch. 5 - Prob. 5.45PCh. 5 - R134a fills a 0.1m3 capsule at 20°C, 200kPa. It is...Ch. 5 - Air in a piston/ cylinder goes through a Carnot...Ch. 5 - Consider the previous problem and assume the...
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- · A closed gaseous system undergoes a reversible process with constant pressure of 200kpa. 2500 kJ of heat is rejected, and the volume changes from 5m3 to 2m3. Find the change in internal energyarrow_forwardA Carnot engine absorbs 1900 kJ of heat from a reservoir at 360 °C and exhausts heat to a reservoir at 130 °C. Find the work it does.arrow_forwardWhat is the efficiency of a Diesel Engine if the heat added is 19 BTU and heat rejected is 9 BTU?arrow_forward
- The power of a steam turbine in a thermal power plant is 60 MW. Water vapor enters the turbine at 3MPa pressure, 4000C temperature and 50 m / s speed, 10 kPa pressure, 0.9 dry degree and 200 m / s speed leaves the turbine. Considering the turbine as adiabatic; 1-Find the mass flow of steam 2-Find the turbine outlet cross-sectional area, its ratio (A2 / A1) to the inlet cross-sectional area.arrow_forwardAt the beginning of compression in an SI engine, it operates on a 0.045 kg/s of air from 14 psia and 580R. At the end of combustion process, the temperature is 4450 deg F; rk is 5.5. Determine the value of the net work in HP.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
- 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_forward1.A rotary compressor receives 6m3/min of gas (R=410 J/kg-K, k=1.67) at 105 kPaa, 26.85°C and delivers it at 630 kPaa; changes of potential and kinetic energies are negligible. Find the work in kJ/min if the process is a) isentropic, b) isothermal c)polytropic with n=1.4arrow_forwardAir flows steadily through an engine at a constant temperature, 400K. Find the work per kilogram if the exit pressure is one-third the inlet pressure and the inlet pressure is 207 kPa. Assume that the kinetic and potential energy variation is negligible.arrow_forward
- Steam enters a continuous flow turbine at a pressure of 8 MPa and a temperature of 450 ℃ and reaches a pressure of 70 kPa it is expanding. The mass flow rate of the steam is 200000 kg/hour and it is in the form of saturated steam at the outlet. By accepting the ambient temperature, 25℃ and pressure 100 kPa; a) The power potential of the steam at the inlet conditions b) Can you find the turbine power output for the situation where there are no irreversibilities? (Kinetic and potential energy ignore the changes).arrow_forward1. An engine from a quarry vehicle used in the Build a Beach program of DEMR has a power requirement of 560 kW. Per hour of its operation, it ejects 234 MJ into its surroundings at 50 °C. If it behaves like a Carnot engine, answer the questions below. A. How much work (MJ) is done by the engine per hour of operation? B. What is the efficiency (%) of the engine?C. What is the temperature (°C) of the hot reservoir? 2. Determine the entropy change (kJ/K) associated to the conversion of 10 kg of ice at -11 °C to steam at 121 °C. 3. Anna and Beth are using another rare metal, the nth metal (c = 0.600 J/g-℃), to build the 5-kg cuirass of their design. Initially, the metal is at 2250 K. It is then submerged to 10 kg of water at 15 °C. If the remaining liquid water after submerging the metal is 8.5 kg, solve for the net entropy change (kJ/K) of the system.arrow_forwardEx/ a cylinder is closed by piston and inside it gas has mass (0.45 kg) and pressure (6.7 bar) and temperature (185 °C). The gas is expanded by adiabatic process and becomes has new pressure (138 kpa) and temperature decreased by values (165 K). the work done by the piston is (53 kJ) calculate (Cv) and (y).arrow_forward
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