- #1
AlaskanPow
- 13
- 0
My problem only gives me joules to work with. Is it possible to convert from joules of energy to temperature (Kelvin)?? If so how?
W = Qh-Ql for any heat engine. So this is the definition of efficiency for any heat engine. To calculate the Carnot efficiency, the maximum efficiency of any possible heat engine operating between these two reservoirs, you would need to know the temperatures, Th and Tc.Basic_Physics said:For a Carnot engine it is assumed that all of the extracted heat, QH - QL (high, low), is converted into work by the engine, so that its efficiency is given by
[itex]\epsilon=\frac{Q_{H}-Q_{L}}{Q_{H}}[/itex]
The heat exhausted to the cold reservoir is not the energy output of the heat engine.AlaskanPow said:My book says (efficiency=energy output/energy input)
Which would give me 75% I believe.
So there is no way to get the carnot efficiency?
Carnot Efficiency is a measure of the maximum possible efficiency of a heat engine, which is the ratio of the work output to the heat input. It was first described by French physicist Sadi Carnot in 1824.
Carnot Efficiency is calculated by dividing the temperature difference between the hot and cold reservoirs by the temperature of the hot reservoir. This can be represented by the formula:
Efficiency = (Th - Tc) / Th
A heat engine is a device that converts thermal energy into mechanical work. It operates by taking in heat from a hot source, converting some of it into work, and then releasing the remaining heat to a cold reservoir.
Carnot Efficiency is important because it provides a theoretical limit for the efficiency of any heat engine. It serves as a benchmark for comparing the performance of real-life heat engines and helps in identifying areas for improvement.
The Carnot Efficiency of a heat engine is affected by the temperature difference between the hot and cold reservoirs, as well as the temperature of the hot reservoir. It also depends on the type of working fluid and the efficiency of the engine's components such as the piston and valves.