Thermodynamics Unit 3

Refrigeration, Heat Pump, Reverse Brayton, Cascade Cycle Theory

Evaporators always have ________.

Qin

Condensers always have _________.

Qout

You want to avoid very low ______ in the evaporator.

Pressures

You want to avoid very _______ pressures in the condenser.

High

In a cascade cycle, you have _________ refridgerants.

Multiple

Using a cascade cycle can pull more ______ from the refrigerated space.

Heat (Qin)

A cascade cycle can pull more heat from the refrigerated space, so the __________________________ is increased.

Refrigeration Capacity

A cascade cycle reduces the total _________ required by the system.

Work

A cascade cycle reduces the total amount of work required by the system which, in turn, increases ________.

COPR

Multistage vapor compression refrigeration cycles decreases the required __________________ to operate between given pressures.

Power Input

Multistage vapor compression refrigeration cycles work because it would take more compressor work to compress in ____ process rather than two.

One

Reversed brayton cycles obtain very ______ temperatures.

Low

With a reversed brayton cycle, the heat addition process takes place at constant temperatures. (T/F)

F

A reversed brayton cycle decreases Qin, therefore decreasing _________.

COPR

Using a reversed brayton cycle with added regeneration, temperatures get even _________.

Lower