FUNDAMENTALS OF THERMODYNAMICS
10th Edition
ISBN: 9781119634928
Author: Borgnakke
Publisher: WILEY
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9. An air compressor takes in air at 105 Pa and 27°C having volume of 1.5
m3/kg and compresses it to 4.5×105 Pa. Find the work done, heat transfer
and change in internal energy if the compression is isothermal.
· 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 energy
40°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?
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- A steam turbine receives 0.52 MPa of steam at 300 C. Then expand in an irreversible adiabatic process to a pressure of 0.012 MPa. If the exhaust steam is dry and saturated, calculate:a. The work of an irreversible processb. The efficiency of the process.arrow_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_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_forward
- A refrigeration system has a heat added of 440 kw. If COP is 7,find the mass of cooling water in the condenser for a temperature increase of 14°C.arrow_forwardA compressor has R-134a entering at 10°C, 100 kPa and exiting as a saturated vapor. It is given that this particular compressor also involves heat loss (i.e., this compressor, in a non-typical fashion, has a non- zero q; i.e., you cannot neglect q for this compressor). If the compressor operates in a reversible isothermal manner, find the specific heat transfer and specific work.arrow_forwardA closed constant volume system receives 10.5 kJ of paddle work. The system contains oxygen at 344 kPa, 278 K and 0.06 m3. Find the heat loss if the final temperature is 400 K.arrow_forward
- Two rigid tanks are filled with water. Tank A is 0.2 m³ at 100 kPa, 150°C and tank B is 0.3 m³ at saturated vapor 300 kPa. The tanks are connected by a pipe with a closed valve. We open the valve and let all the water come to a single uniform state while we transfer enough heat to have a final pressure of 300 kPa. Give the two property values that determine the final state and find the heat transfer. B Aarrow_forward4. 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 pressurearrow_forwardQ4: A 600 MW heat engine, which is cooled by water, the thermal efficiency of engine is 0.15 heat reject in engine. Determine thearrow_forward
- Solve it correctly and fast please.arrow_forwardA heat engine receives 5 kW at 800 K and 15 kW at 1000 K rejecting energy by heat transfer at 600 K. Assume it is reversible and find the power output, W.?arrow_forwardThe 1 lb of air has decrease of internal energy of 20.58 Btu while its Fahrenheit temperature is reduced to 1/3 of the initial temperature during a reversible nonflow constant pressure process. Find 1).the initial and final temperatures, 2). heat 3).workarrow_forward
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