A Carnot cycle is a cycle of special interest because: O When it is careflly constructed in a laboratory, it provides an upper limit on cycle efficiency. O It provides the maximum efficiency for any cycle It operates between two constant-temperature thermal reservoirs It establishes a lower limit on cycle efficiency.

PYQ Chemical EngineeringA heat exchanger uses 5000 kg/hr of water to cool hydrocarbon oil from 140oC to 65oC. The oil, flowing at the rate of 2500 kg/hr has an average specific heat of 0.6 kcal/kg.oC. The water enters at 20oC. Determine The entropy change of the oil Entropy change of water The total entropy change as a result of this heat exchange process.

Consider the PV diagram as shown above when a thermodynamic system changes its state from state a to state b. With the assumption that the system changes only in its internal energy therefore the changes in internal energy along any of the 3 paths are numerically equal. Be mindful of the directions of the arrows. When a system is taken from state a to state b along the path acb , 120 J of heat flows into the system and the system does 50 J of work. If the work done by the system is 25 J, the amount of heat in J that flows into the system along the path aeb is O 95 O 85 60 O 80

Consider a reheat-regenerative vapor power cycle with two feedwater heaters, a closed feedwater heater and an open feedwater heater. Steam enters the first turbine at 8000 kPa and 480oC and expands to 700 kPa. The steam is reheated to 440oC before entering the second turbine, where it expands to the condenser pressure of 8 kPa. Steam is extracted from the first turbine at 2000 kPa and fed to the closed feedwater heater.  The feedwater leaves the closed heater at 205oC and 8000 kPa and enters the boiler to complete the cycle. The condensate from the closed feedwater heater is throttled into the open feedwater heater. Steam extracted from the second turbine at 300 kPa is also fed into the open feedwater heater, which operates at 300 kPa. The stream exiting the open feedwater heater is saturated liquid at 300 kPa. The net power output of the cycle is 100 MW. If the working fluid experiences no irreversibilities as it passes through the turbines and pumps, determine: 1. thermal efficiency…

chemical engineering A heat engine receives 500 BTU of heat per cycle from a reservoir at 540oF and rejects heat to a sink at 40oF in a hypothetical amounts of (a) 375 BTU per cycle (b) 250 BTU per cycle and (c) 150 BTU per cycle. Which of these respective cases represent a reversible cycle, an irreversible cycle and an impossible cycle?

An ideal gas CP = 7R/2 is heated in a steady flow heat exchanger from 70oC to 190oC, by another stream of the same ideal gas entering at 320oC. The flow rates of the two streams are the same. (i) Calculate ΔS of the two gas streams for countercurrent flow (ii) What is ΔStotal? (iii) If heating stream enters at 200oC, what is ΔStotal?

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DIFFERENTIAL EQUATIONS UPVOTE WILL BE GIVEN. PLEASE WRITE THE COMPLETE SOLUTIONS. NO LONG EXPLANATION NEEDED BOX THE FINAL ANSWER

a Because energy can be changed from one form to another, the energy lost by one system cannot be gained by another system in a different form. The internal energy of a system is the difference of heat exchange and the work done. The symbol for heat exchange is Q. TRUE OR FALSE

A) Give the meaning of the following terms: (1) thermodynamic system (2) thermodynamic cycle (3) thermodynamic process (4) thermodynamic law. B) Choose the correct answer, In an extensive property of a thermodynamic system: (1) extensive heat is transferred (2) extensive work is done (3) extensive energy is utilized (4) all of the above (5) none of the above. C) Which of the following is an intensive property of a thermodynamic system? (1) Volume (2) Temperature (3) Mass (4) Energy (5) Velocity D) The following is the equation which connects u, p and v for several gases: u = a + bpv, Where a and b are constants, prove that for a reversible adiabatic process, b+1 pur: = constant, Where y = b