If a 35.0% -efficient Carnot heat engine (Fig. 22.2) is run in reverse so as to form a refrigera

step 1 In this question, we are given a canoe heat engine. Okay, it is 35 % efficient, and then we reve

If a 35.0% -efficient Carnot heat engine (Fig. 22.2) is run...

Labs

Want to see this concept in action?

NEW

Explore this concept interactively to see how it behaves as you change inputs.

View Labs

Key Concepts

Reversibility of the Carnot Cycle

The Carnot cycle is a reversible cycle, meaning that if the processes are reversed, the same thermodynamic relationships apply in reverse. This reversibility implies that the temperature ratios used to determine the efficiency of a Carnot engine can be directly used to derive the performance characteristics, such as the COP, of a Carnot refrigerator operating between the same two reservoirs.

Carnot Efficiency

This concept refers to the maximum efficiency any heat engine can achieve operating between two thermal reservoirs, and it is determined solely by the temperatures of the hot and cold reservoirs. The efficiency for a Carnot engine is given by the formula ? = 1 - (T_c/T_h), demonstrating that efficiency depends entirely on the ratio of the absolute temperatures at which heat is absorbed and rejected.

Coefficient of Performance (COP) for Refrigerators

The coefficient of performance is a measure of the effectiveness of a refrigerator, defined as the ratio of heat removed from the cold reservoir to the work input required for the refrigeration cycle. In the ideal Carnot refrigerator, the COP is expressed as COP = T_c/(T_h - T_c), showing that it too is directly determined by the absolute temperatures of the thermal reservoirs.

Transcript

Please give Ace some feedback