FUNDAMENTALS OF THERMODYNAMICS
10th Edition
ISBN: 9781119634928
Author: Borgnakke
Publisher: WILEY
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A bio-reactor is kept at 42°C by a heat pump driven by a motor of 2 kW. The reactor loses energy at a rate of 0.5 kW per degree difference to the colder ambient. The heat pump has a COP that is 50% that of a Carnot heat pump. What is the minimum ambient temperature for which the heat pump is sufficient?
A large heat pump should upgrade 4 MW of heat at 65 C to be delivered as heat at 145 C. What is the minimum amount of work input that will drive this?
3.Two Carnot heat engines run in series with the efficiency of first engine is 1/k times the second. If the thermal
reservoir at low and high temperatures were denoted by TL and TH, find the simplified ratio of heat absorbed to
heat rejected by the second heat engine in terms of TL, TH and k only.
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- Find the efficiency of the Carnot heat engine operating between 427 C and 77 C.arrow_forwardAn inventor draws 25000 kJ/h of heat from a heat well at -30°C, which requires 1.2 kW of power. He claims to have developed a refrigeration cycle that dumps heat into the heat source at 20°C. environment There is no other energy transfer with Evaluate this claim.arrow_forwardA solar energy based heat engine which receives 80 kJ of heat at 100 deg C and rejects 70 kJ of heat to the ambient at 30 deg C is to be designed. The thermal efficiency of the heat engine isarrow_forward
- An inventor comes to you saying he has invented a refrigerator that maintains a room at 20F while operating in a location at 80F with a coefficient of performance of 8.5, is this possible?arrow_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? (B) 2.33 (D) Can't be calculate (A) 0.30 (C) 3.33arrow_forwardFind out the COP of a Carnot heat pump operating between 6°C and 37°C.arrow_forward
- A heat engine with a thermal efficency of 45% rejects 500kJ/kg of heat. How much heat does it recieve?arrow_forwardA Carnot Engine receives 250 KJ/s of heat form a heat-source reservoir at 525ºC and rejects heat to a heat-sink reservoir at 50ºC. What is the power developed and heat rejected?arrow_forwardA heat pump absorbs 10 kW of heat from outside environ- ment at 250 K while absorbing 15 kW of work. It deliv- ers the heat to a room that must be kept warm at 300 K. The Coefficient of Performance (COP) of the heat pump isarrow_forward
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