Thermodynamic Cycles and Thermal Reservoirs

In Lesson 4F we learned that thermodynamic cycles consist of a system, a cold reservoir, and a hot reservoir.
Reservoirs are regions outside the system that are so large that their intensive properties remain constant.
Thermal Reservoirs are bodies that can exchange an infinite amount of heat with the system. The temperature of a thermal reservoir never changes.
The system transfers heat to a thermal reservoir called a heat sink.
A heat source is a thermal reservoir that transfers heat to the system.
Earth's atmosphere, large bodies of water, vapor condensing at a constant pressure
This diagram shows a hot reservoir, a cold reservoir and a system boundary that encloses the processes that make up a cycle.
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Ch 6, Lesson B, Page 2 - Thermodynamic Cycles and Thermal Reservoirs