FUNDAMENTALS OF THERMODYNAMICS
10th Edition
ISBN: 9781119634928
Author: Borgnakke
Publisher: WILEY
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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 pressure
Provide 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/s
A 5 m3rigid tank has propane at 500 kPa, 700 K and connected by a valve to another tank of 0.7 m3with propane at 350 kPa, 600 K. The valve is opened and the two tanks come to a uniform state at 350 K. What is the final pressure?For propane R = 0.1886 kJ/kgK
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- TH 3 kg of air as an ideal gas undergoes a Carnot refrigeration cycle as shown The isothermal expansion occurs at 300K and isothermal compression occurs at 600K. The heat transfer to air during isothermal expansion is 125 kJ. Pressure at the end of figure. isothermal expansion is 75 kPa. a. Find pressure at the beginning of the isothermal expansion. Show all work and explain your numbers. b. Sketch this cycle on the T-s diagram. Show on the diagram the system states (1,2,3, and 4), the cycle direction, and the cycle work (not its amount)arrow_forwardWater at 50°C is cooled in a cooling tower which has an efficiency of 65%. The temperature of the surrounding air is 35°C dry bulb and 70% relative humidity. The heat dissipated from the condenser is 2,000,000kJ/hr. Find the capacity in liters per second of the pump used in the cooling tower.arrow_forwardWhat is the ideal mass flow rate for a refrigeration and cryogenic plant for oxygen production? Show solution if necessary and reference.arrow_forward
- Compute for the work steady flow.arrow_forwardA Factory uses a vapor absorption refrigerator to cool its products, the heat is supplied to generator by steam at 150 C (hfg=2500kJ/kg) and 90% dry. The temperature of the evaporator is to be maintained at -5 C. the refrigeration capacity is 20 Tonnes and actual COP is 70% of the maximum, atmospheric Pressure is 1 bar and ambient temperature 30 C. find the maximum COP. mass of steam per hourarrow_forwardPlease be very detailedarrow_forward
- Air in an ideal diesel is compresses from 8 liters to 0.15 and then expands during the constant pressure heat addition process to 0.3 L. Under cold air standard conditions, find the thermal efficiency.arrow_forward5. A 1-m³ rigid tank has propane at 100 kPa, 300 K and connected by a valve to another tank of 0.5 m3 with propane at 250 kPa, 400 K. The valve is opened, and the two tanks come to a uniform state at 325 K. What is the final pressure?arrow_forward09: Steam at 110 bar has a specific volume of0.0196 m3/kg, find the temperature, the enthalpy and the internal energy.arrow_forward
- A geothermal powerplant uses steam that enters a nozzle @ 973.15 K at 300 kpa under a velocity of having 20 m/sec, such that the steam exits at 200 kpa. The operator provides the process that is adiabatic and reversible. Calculate the ff. a. going out velocity of steam b. the going out temperature c. the sp. enthalpy at going out.arrow_forwardAn ammonia simple vapor operator between evaporator and condenser temperature of 20 C and 35 C respectively. the system used introducing 5000kg of sec in 20 hours. a 100x200 mm compressor with a compressor efficiency of 80% and electric input to the motor driving the compressor is 14 kw motor efficiency is 90%, determine heat, (b) work indicated (c) brake work (d) mechanical efficiencyarrow_forward/Heat is transferred from a tank of water in a refrigerator at(OC) degrees to a tank of boiling water at (100 C) degrees. With a reversible machine (heat pump). Calculate the Heat drawn from the refrigerator. if it was The heat transferred to the tank of boiling water is 2254kJ.arrow_forward
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