What is Direct Expansion Air Handling Unit

What is Direct Expansion Air Handling Unit

Direct Expansion Air Handling Unit is a combined air handling equipment with its own cooling and heating source, which combines an air handling unit with an air-cooled compression condensing unit, and realizes the cooling or heating function by directly connecting through the refrigerant pipeline. This type of unit is characterized by a simple, energy-saving system and does not need to be equipped with a chilled water system and a cooling water system, and is suitable for places with high requirements for cleanliness.

Main components.

Air handling unit .

Contains components such as evaporator, filter, fan, etc., which are responsible for handling the temperature, humidity and cleanliness of the air.

Air-cooled compression condensing unit: .

Containing compressor, condenser and other components, responsible for the circulation of refrigerant and the generation of cold.

Working Principle: .

Refrigeration: Liquid refrigerant directly evaporates and absorbs heat in the evaporator, lowering the air temperature.

Heating: In heating, the refrigerant condenses and releases heat in the evaporator to raise the air temperature.

Advantages.

Simple system: no need for complicated chilled water and cooling water system, easy to install and maintain.

Energy saving: reduce the loss of secondary heat exchange, improve the efficiency of the system.

Strong applicability: It can be widely used in places with high requirements for cleanliness, such as electronic plants, hospital operating rooms, etc.

Disadvantages.

Maintenance cost.

As the refrigerant is in direct contact with the air, the maintenance cost is relatively high in case of leakage.

Energy efficiency ratio.

Under certain conditions, direct expansion air conditioners may not be as efficient as water-cooled air conditioners.

Applications: Direct Expansion Air Handling Units are widely used in a variety of applications.

Direct Expansion Air Handling Units are widely used in various places where clean air is required, such as:

Electronic factories: where air cleanliness, temperature and humidity are extremely high.

Hospital operating rooms: need to strictly control air cleanliness to prevent infection.

Laboratory: need to control the air temperature, humidity and cleanliness.

Precision instrument manufacturing: requires stable and reliable temperature and humidity environment.