Refrigeration

Question 1

What are the 3 methods of heat transfer?

Answer 1

Conduction (direct contact), Convection (mass motion of molecules) and Radiation (electromagnetic radiation)

Question 2

What is latent heat?

Answer 2

Where the state changes but the temperature remains the same.

Question 3

What is sensible heat?

Answer 3

Where the temperature changes but the state stays the same.

Question 4

What is superheat?

Answer 4

Every degree above a liquids boiling point.

Question 5

What is subcooling?

Answer 5

Every degree below a liquids boiling point.

Question 6

What is the name of the commonly used refrigerant and why do we use it?

Answer 6

R134A
It has a lower boiling point (-26.5 degrees) at atmospheric pressure. This means it will stay colder than the heat it is extracting from the system.

Question 7

What are the components of the Refrigeration cycle?

Answer 7

Compressor
Condenser
Thermal Expansion Valve
Evaporator