The upstream of the indoor ventilation system industry includes raw materials such as steel, plastic and electronic components; the downstream is mainly used in residential, office buildings, shopping malls, restaurants, subway stations, railway stations, factories, hospitals, schools, etc.

1.Gas-liquid separator
In the evaporator, as the liquid evaporates in the evaporator, the liquid changes into a gas. Due to the change of load, there may be a part of the refrigerant that is not fully evaporated, but will directly enter the compressor.

The air duct can be rectangular or circular. Any type of materials used in pipeline construction must have the characteristics of not transmitting fire, not releasing toxic gas in case of fire, and must be able to bear its weight, stress generated by handling, and vibration and erosion generated by air passing through its interior mechanically.

Production of variable diameter duct
The reducing pipe of the rectangular air duct has two types: single-sided eccentricity and double-sided eccentricity. The angle φ of the single-sided variable diameter should be less than 30%, and the included angle of the double-sided variable diameter should be less than 60%.

As PIR pre-insulated duct system is getting its way into the HVAC industry. The knowledge of duct fabrication is necessary for pre-insulated duct fabricatiors and air conditioning contractors. This article shows how to fabricate and install PIR pre-insulated duct systems by hand made.

--- What is an air duct and what types of common air ducts are there?
The air duct mainly refers to the ventilation duct of the central air conditioning system. It is often overlooked, but it is an important part of the air conditioning system. The air duct is made of thin steel plate, aluminum plate, hard polyvinyl chloride plate, glass fiber reinforced plastic and other composite materials. It is a general term for various pipes used to transport air and air mixture.

The days of classic metal plate or glass wool ventilation ducts may be numbered. Over time, the typical lifetime ductline is being replaced by more flexible systems.

1.Compression air conditioning refrigeration
When the air conditioner is in cooling operation, the low-temperature and low-pressure refrigerant gas is inhaled by the compressor and then pressurized into a high-temperature and high-pressure refrigerant gas.

1.How to choose a fan coil unit?
The fan coil unit has two main parameters: cooling (heat) volume and air supply volume, so there are two ways to choose:

CNC routers normally have 4 major parts, controller, cutting bed, spindle, drive system. The controller is the brain of the CNC router, it sends signals to the arms and tells them which direction to move the spindle.

First, find out the elevation of the air duct according to the design requirements and with reference to the civil construction datum line.

The CLIMAVER duct This company is the main representative and distributor of the international Pre-insulated duct market. This panel has a unique housing with marked guidelines, which helps cut and eliminates the risk of drawing errors.