1、 Composition of air conditioning system
Air conditioning consists of four parts: refrigeration system, ventilation system, electrical control system, and enclosure system.
1. The refrigeration system is the most basic system of every air conditioner, and it is the main part that realizes the cooling or heating function of the air conditioner; The ventilation system is the part that realizes heat exchange, which sends the cold generated by the refrigeration system indoors and the heat in the condenser outdoors.
2. Electrical control is the operating system of an air conditioner, which has two methods: mechanical control and electronic control. Only with it can the air conditioner work according to people's wishes.
3. The box system is the support frame of the air conditioner, on which various components are installed. The four systems, according to their respective functions, form a complete air conditioner.
2、 Cleaning of air conditioning system
Cleaning method for moldy smell of air conditioning:
Experienced manufacturers may notice a musty smell when the air conditioner is turned on for the first time. If the air conditioner has not been used for a whole winter, the air supply duct will be filled with dust and odors. When the air conditioner is first started, the air blown out has a moldy smell, 90% of which is due to the growth of mold in the evaporator of the air conditioner. The simplest method is to find a sunny day and place it under the sun. First, place the air conditioning system in the warm air mode, turn on the air volume to the maximum, and in the fully open state, after more than ten minutes, the mold can be eliminated. Generally, the "musty smell" can be solved. But if the moldy smell reoccurs after a few days, it is necessary to check whether the filter screen of the air filter needs to be cleaned or replaced. After cleaning the filter, it is best to do another car disinfection and beauty treatment with photocatalyst, but the cost is relatively high.
Cleaning the evaporator:
If the air conditioning filter cartridge has been replaced for a short period of time and there is a decrease in air flow or odor, it is recommended to clean the evaporator. During the cleaning process of air conditioning filters, two types of chemicals are often used: one is a disinfectant for the air conditioning filter, and the other can be used to remove dust and hair impurities accumulated on the evaporator through ultrasonic atomization or high-pressure methods. These impurities, after being atomized by ultrasonic waves, will be discharged through the air conditioning drain. After a thorough cleaning, the air conditioner can now function normally and blow out waves of clean cool air.
3、 Air conditioning system cleaning 3 Air conditioning system debugging
1. Air volume balance of duct system
The air volume of each part of the system should be adjusted to the design requirements, and the air volume can be adjusted by changing the regulating valve. Debugging can start from the end of the system, that is, from the branch pipe farthest from the fan, and gradually adjust to the fan, so that the actual air volume of each branch pipe reaches or approaches the design air volume. Finally, when the air volume of the fan is adjusted to the design value, the air volume of each part of the system can still meet the requirements. After the system air volume is balanced, it should reach:

① The deviation between the measured values of air volume, fresh air volume, exhaust air volume, and return air volume at the air outlet and the design air volume shall not exceed 10%;

② The sum of air volume and return air volume should be approximately equal to the total supply air volume or the sum of all supply air volumes;
③ The total supply air volume should be slightly greater than the sum of the return air volume and exhaust air volume. The continuous operation of the ventilation system should not be less than 2 hours.
2. Testing of fresh air system
The fresh air system mainly consists of air ducts, fresh air regulating valves, and fresh air handling units. The testing method is the same as that of the air supply system. When adjusting the fresh air volume, it must meet the design requirements, otherwise various drawbacks may occur. If the fresh air volume is too high, it will increase the heat load of the refrigeration compressor and affect the indoor air conditioning effect; If the fresh air volume is too low, it does not meet the national hygiene standards and makes people feel stuffy and uncomfortable. Therefore, it is necessary to ensure the positive or negative pressure indoors and adjust the fresh air volume appropriately.
3. Debugging of air conditioning water system
The pipelines of the cold water system are long and complex, and the cleanliness requirements inside the system are high. Therefore, strict and careful cleaning is required when cleaning the pipes. Century Star recommends closing the inlet valves of fan coil units and other equipment before cleaning. Open the bypass valve to allow impurities inside the pipe during the cleaning process to be discharged outside the pipe through the bypass valve.
4. The normal joint trial operation of the air conditioning system with cold and heat sources shall not be less than 8 hours During the trial operation, various factors should be considered, such as whether the building decoration materials are dry and whether the indoor heat and humidity load meets the design conditions.
4、 Classification of air conditioning systems
1. Central air conditioning
All air handling equipment (fans, filters, heaters, coolers, humidifiers, dehumidifiers, refrigeration units, etc.) are centralized in the air conditioning room. After air treatment, they are sent to each air conditioning room through air ducts. This air conditioning system also has centralized heat and cold sources. It has a large air handling capacity, reliable operation, and is easy to manage and maintain, but the computer room occupies a large area.
2. Semi centralized air conditioning
The air treatment equipment concentrated in the air conditioning room only processes a portion of the air, and there are also air treatment equipment in scattered air conditioning rooms. They either process indoor air on-site or supplement and reprocess air from centralized processing equipment. Induction system, fan coil unit+fresh air system are typical examples of this semi centralized air conditioning system.
3. Local air conditioning
This system disperses all air handling equipment in air-conditioned rooms, hence the local air conditioning system is also known as a decentralized air conditioning system. The various air conditioners commonly used belong to this category. The air conditioner integrates indoor air handling equipment, indoor fans, and cold/heat sources and refrigerant output systems into a single box. Distributed air conditioning only delivers cold and hot carriers indoors, while the air is processed in the fan coil units inside the room.