FUNDAMENTALS OF THERMODYNAMICS
10th Edition
ISBN: 9781119634928
Author: Borgnakke
Publisher: WILEY
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What is the maximum efficiency of heat engine working between 1500K and 300K temperature.
If such engine generates 320 kW of work after extracting 700 kJ/s heat from 1500K source, find the second law efficiency.
A Camot engine operates between 12000F and 1000F and rejects 40 Btu to the low temperature heat reservoir. Find the net work.
A carnot heat pump is operating to keep a room at 20C. The unit is taking in air from a -30C location. If it is pulling 5kW from the -30C location, what is the power input required to do this and how much heat is delivered to the 20C room?
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- A heat engine operates between a cold reservoir at temperature T, = 300 K and a hot reservoir at Temperature T,. It takes 200 J %3D of heat from the hot reservoir and deliver 120 Jof heat to the cold reservoir in a cycle. What will be the efficiency of the engine?arrow_forwardA refrigerator cycle uses refrigerant R-134a and operates between a low-side pressure of 1.5 Bar and high side of 10 Bar. The power input to the compressor 1.88 Kw. find the refrigerant mass flow rate, condensing heat load, and COP of this machinearrow_forwardNonearrow_forward
- A heat pump operates between temperature ranges of 100 C and 250 C. Find its COP. What will be its efficiency if the heat engine operates in the same temperature range?arrow_forwardA reversed carnot cycle that operates between -2 degrees celsius and 50 degrees celsius needs 45 KW compressor power. Find the tons of refrigeration.arrow_forwardFind the COP of heat pump operating between 1000K and 300Karrow_forward
- Solve it fastarrow_forwardThe thermal efficiency of a Carnot heat engine is 30%. If the engine is reversed in operation to work as a heat pump with same operating conditions then what will be the COP for heat pump?arrow_forwardA bio-reactor must be kept at 42°C by a heat pump driven by a 3 kW motor. The reactor has a heat loss of 12 kW to the ambient at 15°C. What is the minimum COP that will be acceptable for the heat pump?arrow_forward
- An Otto cycle has a heat rejected of 300 kJ and work of 700 kJ. Find the cycle efficiency.arrow_forwardHeat engine operating between Tl and T2 (T1 > T2) has the efficiency of 70%. If the machine is reversed and used as refrigerator, what will be COP?arrow_forwardA geothermal power plant has the thermal energy at well head of 1,289 KJ, mass of the liquid of 82 kg, and specific enthalpy at final stage of 4.12 KJ/KG, what is the value of work at the heat utilization system of the plant?arrow_forward
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