Commonly Used HVAC Terms and Explanations Part 2

9. Cooling Tower: Special equipment for cooling water by means of air. Generally installed on the top of the building. It is used in refrigeration, electric power, chemical industry and many other industries. The hot cooling water discharged from the condenser and other equipment is recycled after being cooled by the cooling tower.

10. Modular unit: It changes the traditional Freon pipeline into a water system, combines the indoor and outdoor units into a refrigeration unit, and changes the indoor unit into a fan coil unit. It uses the heat exchange of the refrigerant water to realize the refrigeration process. The modular machine gets its name because it can automatically adjust the number of start-up units according to the cooling load requirements and realize flexible combination.

11. Multi-connection: Multi-connection is not actually a central air conditioner in the traditional sense. The central air conditioner in the traditional sense is to pass water into the fan coil unit, and the multi-split unit is to directly pass fluorine into the fan coil unit. Therefore, it is destined that the multi-line pipeline should not be too long. However, the energy loss in the pipeline of the multi-line is greater than that of the split machine. If the pipeline of the multi-line leaks, it is often impossible to repair. Not all compressors are variable frequency, generally only one compressor is variable frequency, and the others are fixed frequency. The multi-line pipeline system and control system are more complicated.

12. The difference between the modular machine, the screw machine and the multi-line machine: the modular machine and the screw machine are both water systems, that is, the chilled water comes out of the main machine, and is supplied to the indoor end fan plate and other equipment for cooling. The multi-line is a fluorine system, and the refrigerant (R22 or R410a refrigerant, etc.) coming out of the main unit is the internal unit that is connected to the fluorine pipe at the end of the supply to the room. It is similar to the one-to-one air-conditioning unit for home use, except that it has become one-to-many, and frequency conversion (DC frequency conversion or digital scroll frequency conversion) technology has been added.

13. The difference between an air-cooled machine and a water-cooled machine: an air-cooled machine means that the host uses a fan to dissipate heat, and a water-cooled machine means that the host uses water to dissipate heat. The air cooler has a compact structure, does not require a special machine room, and is easy to maintain. The disadvantage is that cooling and heating are greatly affected by the climate, and the energy efficiency ratio is slightly lower than that of water coolers. Water-cooled machines generally require a dedicated machine room with a cooling tower. The system is a bit more complicated, the maintenance is a little cumbersome, and most of them cannot be used for heating. The advantage is that the cost is lower than that of air-cooled machines, and the energy efficiency ratio is slightly higher than that of air-cooled machines.

More Recommendations:

The pre-installation of air conditioning ducts, step by step

Air duct machine installation precautions

Advantages of good ventilation system

The characteristics, design methods and comparison of commonly used air-conditioning systems Part Three

Central Air-conditioning Construction Site Experience-Part 3

Reasons why factory-made air ducts are more advantageous than on-site production

The characteristics, design methods and comparison of commonly used air-conditioning systems Part Four

Commonly Used HVAC Terms and Explanations Part 1

Composite pre-insulated air duct

What are the precautions for fresh air system installation