[D2L] 102B Vapour Compression Cycle

Question 1

What will a liquid changing to a vapour do to heat?

Answer 1

Absorb the heat

Question 2

What will a vapour changing to a liquid do to heat?

Answer 2

Release heat

Question 3

What is the state change called when a substance changes from a liquid to a vapour?

Answer 3

Evaporating

Question 4

What is the state change called when a substance changes from a vapour to a liquid?

Answer 4

Condensation

Question 5

Non-Positive displacement compressors (Centrifugal compressors) do not have cylinders or pistons?

T or F

Answer 5

True

Question 6

Potential energy is energy based on position

Answer 6

True

Question 7

What is positive displacement?

Answer 7

The process of moving a piston to squeeze vapour in a cylinder

Question 8

How does a centrifugal compressor increase refrigerant pressure?

Answer 8

Forces the acceleration of refrigerant

Question 9

Which are the four essential components for a refrigeration system? (MULTI-SELECT)

1) Evaporator
2) Water pump
3) Compressor
4) Metering device
5) Condenser

Answer 9

Evaporator
Compressor
Metering device (TXV)
Condenser

Question 10

Where does the refrigerant change pressure? (Choose all that apply)

1) Metering device
2) Condenser
3) Compressor
4) Evaporator

Answer 10

Metering device
Compressor

Question 11

What order does refrigerant flow? (start with the compressor)

Answer 11

1. Compressor
2. Condenser
3. Metering device
4. Evaporator

Question 12

What is the order of the state change that occurs in the condenser?

Answer 12

1. Desuperheat
2. Condensing
3. Subcooling

Question 13

What should the state of the refrigerant be at the outlet of the evaporator?

Answer 13

Low pressure vapour

Question 14

What is superheating?

Answer 14

The process of adding sensible heat to a vapour while it remains at a constant pressure.

Question 15

List the order of state the refrigerant is in the evaporator

Answer 15

1. mostly liquid
2. 1/2 liquid and 1/2 vapour
3. complete vapour