FUNDAMENTALS OF THERMODYNAMICS
10th Edition
ISBN: 9781119634928
Author: Borgnakke
Publisher: WILEY
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It has been suggested that a building could be heated by a refrigeration engine operating in a Carnot cycle. The engine takes heat from the outside at 280 K and delivers heat to the building a 295 K. How much work would have to be done for every kilo joule heat delivered to the
building?
The 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?
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?
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- A 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_forwardWhat 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.arrow_forwardNonearrow_forward
- Nonearrow_forwardA 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?arrow_forwardCogeneration is often used where a steam supply is needed for industrial process energy. Assume a supply of 5 kg/s steam at 0.5 MPa is needed. Rather than generating this from a pump and boiler, the setup in below. is used so the supply is extracted from the high-pressure turbine. Find the power the turbine now cogenerates in this process. 2 3 HP LParrow_forward
- Find the COP of heat pump operating between 1000K and 300Karrow_forwardCarnot Cycle A, B, C are connected in series so that the heat rejected from A will be the heat added to B and heat rejected from B will be added to C. Each cycle operates between 303K and 4000C. If heat added to A is 1000 kW, find the work output of C, kW, nearest tenths.arrow_forwardA 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_forward
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