What is the efficiency of the cycle?
THe total thermal energy transferred out of the gas in one cycle is 1300J. Determine the efficiency of the cycle. The area within the cycle is equivalent to the work done by the gas, which is 610J. My first guess was just the ratio of the useful work done to the total, i.e 6101300+610 to give about 32%.
What is thermal efficiency formula?
quantities are heat-equivalent values. So, for a boiler that produces 210 kW (or 700,000 BTU/h) output for each 300 kW (or 1,000,000 BTU/h) heat-equivalent input, its thermal efficiency is 210/300 = 0.70, or 70%. This means that 30% of the energy is lost to the environment.
Why is 100 Efficiency impossible?
It is impossible for heat engines to achieve 100% thermal efficiency () according to the Second law of thermodynamics. This is impossible because some waste heat is always produced produced in a heat engine, shown in Figure 1 by the term.
Why is a Carnot engine reversible?
Heat transfer between the heat source and the cylinder occurs with an infinitesimal temperature difference. Hence, it is a reversible heat transfer process. Gas in the cylinder expands slowly, does work to its surroundings, and remains at a constant temperature TH.
What is the condition for the efficiency of a Carnot engine to be one?
The second law of thermodynamics states that for an engine to develop work it must reject heat to a lower temperature source. So Q1 is not equal to zero. So efficiency is always less than 1.
How do you calculate Carnot efficiency?
Carnot efficiency equation
- Use the temperature converter to convert 25°C to Kelvins. You can also do the calculations manually; in this case, Tc = 25 + 273.15 = 298.15 K .
- Repeat step 1 for the temperature of the hot reservoir.
- Input these values into the Carnot efficiency equation:
What is the efficiency calculator?
This energy efficiency calculator is a simple tool for calculating the ratio of useful energy output to the energy input. You can use it for determining the proportions of heat energy, electric power, mechanical work, or even chemical energy.
Why is the Carnot cycle useful?
The Carnot engine — or the Carnot cycle — is important because it describes a heat engine that uses reversible processes that can be handled theoretically. Then we could use the real heat engine to power a Carnot cycle heat pump. During this isothermal expansion heat Qh flows into the gas from the hot temperature Th.
What is Carnot cycle explain?
: an ideal reversible closed thermodynamic cycle in which the working substance goes through the four successive operations of isothermal expansion to a desired point, adiabatic expansion to a desired point, isothermal compression, and adiabatic compression back to its initial state.
Why is Carnot cycle not used?
Carnot cycles are not encountered in reality since achieving isothermal heat transfer is very difficult (needs very large heat exchangers and long time). Also process 3-4 requires a pump or compressor that can handle two phase mixture (liquid and vapor) which is impractical.