FUNDAMENTALS OF THERMODYNAMICS
10th Edition
ISBN: 9781119634928
Author: Borgnakke
Publisher: WILEY
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The thermal efficiency of a Carnot heat engine is 30%.
If the engine is reversed in operation to work as a heat
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An engine has a thermal efficiency of 40%. It is used to drive a refrigerator having a COP of 5.0.Heat Removed from the cold body by the refrigerator is 1 kJ. What should be the heat input to theengine?
A 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?
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- Refrigerators currently being manufactured in the United States are using______as their refrigerant.arrow_forwardIt 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?arrow_forward1.) A Carnot engine is coupled to a Carnot refrigerator so that all the work produced by the engine is used by the refrigerator in extraction of heat from a heat reservoir at 270K at the rate of 4 kJ/s. The source of energy for the Carnot engine is a heat reservoir at 500K. If both devise discard heat to the surrounding at 300K, a. How much heat does the engine absorb from the 500K reservoir? b. If the actual efficiency of the engine is n= Ncarnot /1.5 and the COP = COPCarnot/1.5, how much heat does the engine absorb from the 5O0K reservoir?arrow_forward
- Heat is transferred to a heat engine from a fumace at a rate of 120KW. If the rate of waste heat rejection to a nearby river is 50000W. Find the net Power output and the thermal efficiency for this heat engine.arrow_forwardNonearrow_forward5. A heat engine release heat into the cold reservoir at 500 K with a carnot efficiency of 25 %. What exhaust temperature will increase the carnot efficiency to 60 %?arrow_forward
- A cold storage plant of 30 tonnes of refrigeration capacity runs with its performance just th of its 25% of Carnot COP. Inside temperature is -10°C and atmospheric temperature is 25ºC. Calculate the power required to run the plant. [Note: 1 ton of refrigeration = 3.52 kW]arrow_forwardSuppose a certain heat engine has an efficiency of 35%. Heat in In order for this heat engine to do 420 J of useful work, how much energy must be taken in as heat from the high- temperature reservoir? 780 J Work 420 J 12 J 150 J 1620 J 1200 J Heat out O O Oarrow_forwardI need the answer quicklyarrow_forward
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