What are the characteristics of a closed centralized air conditioning system compared to the DC type

The closed type adopts the return air structure, which can save heat or cooling capacity, the structure is relatively complex, the one-time investment cost is high, the operating cost is low, and it is the mainstream air conditioning system.

The direct flow type adopts a fresh air system, with high air supply quality, but the cooling and heating load is large, and the one-time investment cost is low, but the operating cost is high, and it is mainly used in hospitals, places with pollutants or dust.

1. DC air conditioner: fresh air is introduced from the outside, and after temperature and humidity treatment, it is sent indoors, due to the indoor environment, the temperature and humidity of this part of the air changes, and can not meet the requirements of the indoor environment, and then this part of the air is discharged from the room.

That is, fresh air is introduced from the outside, and finally discharged to the outside.

2. Closed air conditioning: that is, the indoor air is repeatedly circulated. The air from the room enters the air conditioning system for temperature and humidity treatment, and then sends it into the room, and when it cannot meet the requirements of the room, it is then treated.

That is, the air in the room is circulated repeatedly.

3. Hybrid air conditioner: a combination of the first two. That is, part of it is fresh air, and part of it is indoor circulating air. That is, a return wind. is the most reasonable way.

The DC type is the best for comfort, but it is the most wasteful of energy when fresh air is always introduced.

The enclosed type is the most energy-saving, but the air quality is the worst if the indoor return air is used repeatedly.

Hybrid, which is currently the most reasonable. Air quality and energy are effectively addressed.

As for what occasion it is suitable for, it depends on the designer

Enclosed centralized air conditioning features:

Compared with the direct flow air conditioner, which brings fresh air from the outside and sends it into the room through temperature and humidity treatment, the closed air conditioner repeatedly circulates the indoor air. That is, the air in the room is circulated repeatedly. Closed air conditioner adopts return air structure, which can save heat or cooling capacity, the structure is relatively complex, the one-time investment cost is high, and the operating cost is low, which is the mainstream air conditioning system.

(1) Centralized air-conditioning system.

The centralized air-conditioning system is to centralize all kinds of air handling equipment and fans in a special machine room, centralize the air treatment, and then the air supply system will send the treated air to each air-conditioning room.

2) Semi-centralized air conditioning system.

In addition to the centralized air treatment room, there is also a secondary treatment equipment in each air-conditioned room to further supplement the air from the centralized treatment room, such as induced air conditioning system and fan coil air conditioning system.

3) Fully distributed air conditioning system.

An air-conditioning unit that assembles air handling equipment, fans, automatic control systems, cold and heat sources, etc., and directly places them in the air-conditioned room to process the air on the spot, such as window air conditioners, split air conditioners and various cabinet air conditioners.

Answer] :d The knowledge points assessed in this question are the content of the closed centralized air conditioning system. The closed centralized air-conditioning system is also known as the full-cycle centralized air-conditioning system, and all the air it handles comes from the air-conditioned room, and all the air is recirculated, and there is no fresh air outside the room to supplement the system. Answer: Oak.

Answers] :d, e

This question examines the category of air conditioning system. Semi-centralized system: In addition to centralized air handling equipment, there are also terminal devices for air treatment in each air-conditioned room.

For example, fan coil unit and fresh air system, multi-line Changdong and fresh air system, inducer system, etc.

Answer]: c, envy d

The fan pan silver scatter pipe plus fresh air system is a typical semi-centralized system. A semi-centralized system that uses an inducer as a terminal device is called an inducer system.

Answer]: The characteristics of the semi-centralized air-conditioning system are that the fresh air treatment equipment is installed in the inspection machine room, and the fan coil is installed in the air-conditioned room, so it is also called the air-water system or the fan coil unit plus the fresh air system.

Answer]: In addition to the centralized air-conditioning machine room, the semi-centralized air-conditioning system also has the secondary treatment equipment (also known as "terminal equipment") in the air-conditioning room to bear part of the cold chain rolling heat load.