FUNDAMENTALS OF THERMODYNAMICS
10th Edition
ISBN: 9781119634928
Author: Borgnakke
Publisher: WILEY
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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.
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- There are received 25 kg/s of steam at 2.15 MPa, 480°C by a Rankine engine; exhaust occurs at 0.10MPa. find the work of turbine in kJ/s. Insert TS diagram, Use Steam Table SI unit onlyarrow_forwardA condenser (heat exchanger) brings 1 kg/s water flow at 10 kPa quality 95% to saturated liquid at 10 kPa. The cooling is done by lake water at 20 degree Celsius that returns to the lake at 30 degree Celsius. For an insulated condenser, find the flow rate of cooling water.arrow_forwardProblem 4.01. A carnot refrigerator (carnot cycle heat pump in reverse) operating between Th and Te is used to cool and freeze a bottle of water, volume V, at a temperature To < Th to freezing temperature T (known density Pw, heat capacity cw). (a) Find the work required to cool and freeze the water. (b) Find the change in entropy in the heat baths, and use it to place a limit on the change in entropy of the water (without calculating the entropy change in the water). The C.O.P. of a carnot refrigerator: KR= Qc = W Te Th-Tearrow_forward
- 9. Air is expanded from 400 kPa, 600 K in a polytropic process to 150 kPa, 400 K in a piston cylinder arrangement. Find the polytropic exponent n and the work and heat transfer per kg air using constant heat capacity.arrow_forwardSolve it correctly please. I will rate accordinglyarrow_forwardPlease help with the correct answer Thermodynamics problemarrow_forward
- 3. 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_forward4. 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))arrow_forwardA complex flow system expands helium from 1500 K, 1000 kPa to 500 K, 100 kPa. In the process this produces 4595 kJ/kg of work. The process exchanges heat with a reservoir at TR. If the process is reversible, find the unknown reservoir temperature (K). You can work this with either Thermofluids or the equations... Your choice. If equations, Cp=5.19 kJ/kg-K, Cv=3.12 kJ/kg-K, R=2.08 kJ/kg-K. Helium 1500 K 1000 kPa TR q 500 K 100 kPa W=4595 kJ/kgarrow_forward
- (15%) A small expander (a turbine with heat transfer) has 0.05 kg/s helium entering at 1000 kPa, 550 K and leaving at 250 kPa, 300 K. The power output on the shaft measures 55 kW. Find the rate of heat transfer, neglecting kinetic energies.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_forwardLiquid water at 35 ºF is fed to a boiler operating at 10 bars and is converted at constant pressureto saturated steam. The steam is produced at a steady state flow rate of 600 lbm/hr. Assume thatthe kinetic energy of the liquid entering the boiler is negligible, and that the steam is dischargedfrom the boiler through a 1 ft pipe.a. Calculate ∆Ĥ (in units of Btu/lbm) for this process.b. Calculate the heat input (Btu/hr) to meet the needed saturated steam production rate.arrow_forward
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