FUNDAMENTALS OF THERMODYNAMICS
10th Edition
ISBN: 9781119634928
Author: Borgnakke
Publisher: WILEY
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What is the COP of the Carnot refrigerator if the COP of the Carnot heat pump is 2.3 where two cycles are operation between identical reservoirs?
A heat exchanger, shown below, is used to cool an air flow from 550 K to 250 K, both states at 1 MPa. The
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1 air
3 water
9 In a constant temperature,
transferred to the working fluid at 80F. What is the change of entropy
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closed system process, 120 BTU of heat is
10
1ne in -rease
of
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- A car engine burns 10 lbm of fuel (equivalent to addition of Q H ) at 2600 R andrejects energy to the radiator and the exhaust at an average temperature of1300 R. If the fuel provides 17 200 Btu/lbm what is the maximum amount ofwork the engine can provide?arrow_forwardA fraction of some power to a motor (1), 2 kW, is turned into heat transfer at 500 K (2) and then it dissipates in the ambient at 300 K (3). Give the rates of exergy along the process 1-2-3.arrow_forwardA heat exchanger is used to cool an air flow from 900 to 400 K, with both states at 1 MPa. The coolant is water flow at 20 degrees C and 0.1 MPa. If the water leaves a saturated vapor, find the ratio of the flow rates (mass flowwater/mass flowair.arrow_forward
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- find the specific enthalphy at each point of the cycle, the amount of heat added, heat rejected, turbine work, pump work, net work and thermal efficiency in a carnot cycle between pressure limits of 3MPa and 10KPaarrow_forward.The thermal efficiency of a heat engine is 30%, the heat rejected from the engine is 30kJ, evaluate the heat input to the engine.arrow_forwardPls solve this 2 question, very urgentarrow_forward
- R-134a as a refrigerant, in a cooling machine used; refrigerant to evaporator (evaporator) 0.15 drynessIt enters with a temperature of -12oC and a flow rate of 0.028 kg/s and leaves the evaporator as saturated steam. cooling machineSince it works according to the reverse Carnot cycle and the compressor consumes 1.45 kW of power a) Find the efficiency coefficient of the cooling machine. b) Calculate the heat given to the outside environment c) Calculate the condenser temperaturearrow_forwardR-134a as a refrigerant, in a cooling machine used; refrigerant to evaporator (evaporator) 0.15 drynessIt enters with a temperature of -12 oC and a flow rate of 0.028 kg/s and leaves the evaporator as saturated steam. cooling machineSince it works according to the reverse Carnot cycle and the compressor consumes 1.45 kW of power a) Find the efficiency coefficient of the cooling machine. b) Calculate the heat given to the outside environment c) Calculate the condenser temperaturearrow_forwardPlz provide answer with in 1 hourarrow_forward
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