How EEV works - Electronic Expansion Valve working principle, HVAC Basics

The video tutorial explains electronic expansion valves (EEVs), highlighting their efficiency and performance benefits in refrigeration systems. It covers various designs, focusing on a simplified model using a permanent magnet step motor. The tutorial details the working principle of EEVs, including their role in controlling refrigerant flow and maintaining superheat. It also describes the components involved, such as sensors and controllers, and how they interact to optimize system performance.

What is one of the main benefits of using electronic expansion valves in refrigeration systems?

• Increased noise levels

• Higher energy consumption

• Reduced energy consumption

• Decreased system performance

Which component in the simplified design of an electronic expansion valve generates an electromagnetic field?

• Valve seat

• Copper coils

• Permanent magnet

• Valve needle

In a refrigeration system, what is the role of the evaporator?

• To create a pressure difference

• To collect unwanted heat

• To compress the refrigerant

• To condense the refrigerant

What happens to the refrigerant as it passes through the expansion valve?

• It remains a liquid

• It increases in pressure

• It becomes a solid

• It drops in pressure

How does the controller determine whether to open or close the expansion valve?

• By measuring the refrigerant color

• By observing the refrigerant's taste

• By comparing saturation and actual temperatures

• By checking the refrigerant's smell

What is the purpose of the pressure and temperature sensors in the refrigeration system?

• To measure the refrigerant's color

• To calculate the superheat

• To increase the refrigerant's volume

• To change the refrigerant's state

What action does the expansion valve take when the cooling load decreases?

• It opens to allow more refrigerant

• It closes to allow less refrigerant

• It remains unchanged

• It increases the refrigerant's pressure