You mean: eff = [1-(T cold/T hot)]*100.
Right.
Good catch, Tom.
A heat engine is a device that converts thermal energy into mechanical energy, typically in the form of work. It operates on the principles of thermodynamics and is used in many everyday applications, such as car engines and power plants.
The efficiency of a heat engine is calculated by dividing the work output by the heat input. This is known as the Carnot efficiency and is expressed as a percentage.
The efficiency of a heat engine is affected by several factors, including the temperature difference between the hot and cold reservoirs, the type of working fluid used, and the design and operation of the engine.
The efficiency of a heat engine is limited by the second law of thermodynamics, which states that it is impossible to convert all of the heat energy into work. Some heat will always be lost to the surroundings, resulting in an efficiency less than 100%.
The efficiency of a heat engine can be improved by increasing the temperature difference between the hot and cold reservoirs, using a more efficient working fluid, and optimizing the design and operation of the engine. Additionally, waste heat can be recovered and reused in other processes to improve overall efficiency.