MEPH Questions

Question 1

What is the difference between comfort cooling and air conditioning?

Answer 1

• Comfort cooling relates solely to cooling of the internal environment.
• Air conditioning relates to numerous different functions including cooling, heating, ventilation, filtration and humidity control.

Question 2

Outline the different types of air conditioning system?

Answer 2

• Constant volume.
• Variable air volume.
• Fan coil units.
• Split units.
• Variable refrigerant flow.

Question 3

What is the difference between VRF and VAV?

Answer 3

• Both refer to the same type of air-conditioning system.

VRF systems use variable refrigerant flow to adjust heating and cooling in different zones, while VAV systems adjust airflow to meet varying cooling needs in a building.

• Daikin registered the term VRV whilst other companies use the term VRF.

Question 4

What is VRF heating and cooling?

Answer 4

• An air conditioning system in which the refrigerant flow to each individual indoor unit can be controlled and varied, meaning indoor unit can provide heating or cooling.
• The system consists of multiple indoor units connected to a single external unit.

Question 5

What are the different types VRF?

Answer 5

• Heat pump VRF (2 pipe) whereby all indoor units can be in cooling mode or heating mode but not simultaneously.
• Heat recovery VRF (3 pipe) whereby all indoor units can be in cooling mode or heating mode at the same time.

Question 6

Outline the different types of ventilation system?

Answer 6

• Natural ventilation.
• Mechanical extract.
• Mechanical supply.
• Mechanical supply and extract.