In the following image, if we intend to increase the theoretical efficiency of this engine, we can raise TH by AT or by decreasing T by the same AT. Which one of the two scenarios will be more effective?
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As we know the efficiency of Carnot heat engine
Efficiency
Now when increase in source then the efficiency becomes
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- An ideal gas expands isothermally along AB and does 700 J of work (see below). (a) How much heat does the gas exchange along AB? (b) The gas then expands adiabatically along BC and does 400 J of work. When the gas returns to A along CA, it exhausts 100 J of heat to its surroundings. How much work is done on the gas along this path?It is found that an engine discharges 100.0 J while absorbing 125.0 J each cycle of operation. (a) What is the efficiency of the engine? (b) How much work does it perform per cycle?When a gas expands along AB (see below), it does 500 J of work and absorbs 250 J of heat. When the gas expands along AC, it does 700 J of work and absorbs 300 J of heat. (a) How much heat does the gas exchange along BC? (b) When the gas makes the transmission from C to A along CDA, 800 J of work are done on it from C to D. How much heat does it exchange along CDA?
- Can you help with subpart d it is not correct 5. A Carnot engine works between two heat reservoirs at temperatures Thot= 301.0 K and Tcold= 220.0 K. a. What is its efficiency? 0.27 % b. If it absorbs 200.0 J from the hot reservoir during each cycle, how much work does it do per cycle? 54 J c. How much heat does it reject during each cycle? 146 J d. What is the coefficient of performace, COP, of this engine when it works as a refrigerator between the same two reservoirs? 3.72Can you help with subpart d 5. A Carnot engine works between two heat reservoirs at temperatures Thot= 301.0 K and Tcold= 220.0 K. a. What is its efficiency? b. If it absorbs 200.0 J from the hot reservoir during each cycle, how much work does it do per cycle? c. How much heat does it reject during each cycle? d. What is the coefficient of performace, COP, of this engine when it works as a refrigerator between the same two reservoirs?8. A heat engine with an efficiency of 40% takesin 600 J of heat from the high-temperaturereservoir in each cycle.a. How much work does the engine do in eachcycle?b. How much heat is released to the low temperature reservoir?
- Help me Please. Thanks in advance a. A Carnot engine takes 1000 Joules of heat from a high temperature reservoir of 560 K and delivers that heat to a low temperature reservoir of 460 K. What is the work exerted on a low temperature reservoir and calculate the efficiency of the engine? b. Carnot engine efficiency is 60% and high temperature is 800K. What is the low temperature?Can you help with subparts a-c 5. A Carnot engine works between two heat reservoirs at temperatures Thot= 301.0 K and Tcold= 220.0 K. a. What is its efficiency? b. If it absorbs 200.0 J from the hot reservoir during each cycle, how much work does it do per cycle? c. How much heat does it reject during each cycle? d. What is the coefficient of performace, COP, of this engine when it works as a refrigerator between the same two reservoirs?2. Two bodies A and B with corstant total heat capacities Cp, and Cp, and different initial temperatures Tg ana Ta, exchange heat with each other under isobaric conditions. No heat is transferred to or from the surroundings and the temp. of both bodies are assumed uniform at al times and the process is irreversibile. a. Derive an expression for the total entropy change of the two Dodies as a function of temp. b. What is the equiliorium temp of the system?
- Question B2i. Give an equation for the infinitesimal change in entropy, ??, of a system in terms of the heat transfer ??? and the temperature ? at which the heat transfer occurs. Explain the sign convention. ii. A litre of water at 20 °C is placed in a fridge at 5 °C. Calculate the change in entropy of the water, including the sign, once all the water has come into thermal equilibrium. iii. Calculate the change in entropy of the fridge from part ii, including the sign. iv. Demonstrate that the Second Law has been obeyed in the process described in ii and iii.Carnot efficiency-theoretical maximum efficiency-can be calculated with just the temperatures of the thermal reservoirs. This makes it a useful tool to quickly estimate possible efficiency for different situations. Try the calculations below. Hint a. Automobile fuel ignites at about 550 K. Estimate the Carnot efficiency assuming that this is the temperature of high-temperature thermal reservoir and the low-temperature thermal reservoir is at the approximate room temperature 300 K. The Carnot efficiency for automobile engines is %. b. In a steam-electric power station, fossil-fuel powered superheater provides a steam of high temperature 700 K. Estimate the Carnot efficiency assuming that the temperature of low- temperature reservoir is at about 350 K (temperature of the condensor kept well below 100°C). The Carnot efficiency for steam-electric power station is %. C. A lecture-demonstration Stirling engine uses a hot cup of coffee as the source of heat energy. Using the high-temperature…Q68 A single cylinder oil engine has a coinpression ratio of 1081. The specific fuel cons umption is o.6 kg/kw.h, the calorific value of the fuel oil is 44000kjlKg. calculate the ther mal efficiency and O the relative efficiency, assuming the engine operates on the constant valume cycle. Take 8-1.4for air Answers [ 13.6% 22.6%1