Air conditioner cleaning  

 Water treatment plan/Budget

The significance of water treatment

     The operation of an air conditioning system requires a large amount of water as a conducting medium. After long-term operation in the system and for other reasons, water can cause problems such as corrosion of the unit equipment, scaling, growth of microorganisms (and algae), and sedimentation of slime. These problems not only increase the various energy consumables of the air conditioner but also affect the normal and stable operation of the air conditioning system and shorten its service life.

Therefore, it is necessary to carry out necessary cleaning and water quality stabilization treatment on the cooling water and chilled water systems to maintain good conduction efficiency, extend the service life of the equipment, and ensure that the unit operates in a stable and safe state. Especially for newly put into operation air conditioning systems or those that start to operate in the new cooling season, cleaning, pre-filming and other treatment work are still required.

Water quality treatment plan

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Cooling water system

During the recycling process of cooling water, it continuously evaporates and concentrates, with the salt content constantly rising. To prevent the salt content from increasing without limit, a portion of the cooling water is discharged while fresh water is replenished. The former is called sewage discharge, and the latter is called water replenishment. When the salt content rises, scale is very likely to form on the water side of the heat exchanger. The formation of scale not only reduces the heat transfer efficiency and increases the refrigeration load, but also causes under-scale corrosion, resulting in waste of water and electricity and shortening the service life of the unit. Therefore, for the water treatment of the cooling water system, it is necessary to control scaling, take corrosion inhibition into account, and add chemicals, drain water and replenish water on time.

Objective: Water conservation, scale prevention, and equipment corrosion prevention

Reagent: Corrosion and scale inhibitor,It can be concentrated in water quality3~4Multiple (water hardness.900~1200ppmUnder such conditions, the scale inhibition rate can be achieved99%The above can be saved20%The water replenishment rate is lower than the national standard50%. Dosing method According to the water quality conditions, relevant parameters are set to automatically add chemicals and manage the drainage of the cooling water system Automatic sewage discharge is implemented based on the results of water quality tests.

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Chilled water system

The chilled water system is a closed system that uses water as the refrigerant medium to exchange with air. Although it has less contact with the outside world, there is an expansion tank at the top of the entire system. Thus, the chilled water medium still comes into contact with air, allowing dissolved oxygen and some nutrients to enter the chilled water system, causing slime deposition. This not only affects heat transfer but may also form an oxygen concentration difference, leading to equipment corrosion. Yellowish-brown or blackish-gray water quality often appears. The chemical treatment of chilled water adopts the method of one-time addition of chemicals to control the corrosion of equipment and the formation of slime. The main problem with the chilled water system is that it is prone to corrosion, resulting in red or black water. The method of its water treatment is to add it once a month according to the size of the water capacity of its systemTNBCorrosion inhibitors should be used. The water quality should be tested once a month. Based on the test results, the corrosion condition of the system should be monitored and the anti-corrosion plan adjusted accordingly.

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Algae control plan

 To prevent the drug resistance and tolerance of fungi and algae, a regular algaecide scheme with multiple algaecides alternately attacking is adopted, which can effectively kill fungi and algae and effectively inhibit their growth. On average, it is killed once every half month.

●Cooling tower and system pipeline cleaning and pre-filming solutions

○Manually clean the accumulated scale and dirt in the cooling tower and the water collection trough.

○After dissolving the descaling agent, repeatedly rinse the packing with a cleaning pump until the scale is completely washed away. (If the packing has been in use for a long time, causing aging and collapse, it is recommended to replace the packing.) At the same time, add an algaecide to thoroughly kill the biological algae and.

○Fill the cooling water system with water, add descaling agent, and start the system circulation pump for circulation8Hours;

○Drain the sewage and then rinse it once again with clean water.

○Clean the filter screen of the circulating pump, remove rust, packing skin and other foreign objects thoroughly, and check if the filter screen is in good condition. Replace it with a new one if it is damaged.

○Pre-filming treatment: Fill the system with water, add pre-filming agent, start the cooling system circulation pump and circulate24When it is small, a protective film is pre-formed on the inner wall of the cleaned system pipeline to prevent corrosion and slow down scaling and other protective functions.

○After discharging the pre-filming solution, it can be put into operation and use.

●Main unit condenser cleaning plan/Budget

○Drain the water in the system and establish a temporary circulation system between the inlet and outlet pipes of the cooling system (thermometers, pressure gauges, exhaust valves, blowdown valves, etc. can be removed and connected to the external circulation pump with hoses).

○After dissolving the descaling agent, inject it from the water inlet with a circulating pump and return it from the water outlet for circulation and soaking4About an hour. At the same time, constantly test the efficacy of the water until all the scale in the system is completely cleaned.

○Drain the sewage and rinse thoroughly with clean water.

○Restore all parts of the system.

●Pre-filming treatment plan for cooling water system/Budget

○Fill the system with water, add the pre-filming agent, start the cooling system circulation pump and circulate24After a certain period of time, a protective film should be pre-formed on the inner walls of the cleaned system pipelines to prevent corrosion and slow down scaling, etc. Then, the pre-formed liquid should be discharged and it can be put into operation.

●Cleaning quality control standards

"HG/T2387－92Quality Standard for Chemical Cleaning of Industrial Equipment

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