The air conditioning circulating water system is mainly divided into two parts: circulating cooling water and circulating chilled water. The cooling water system operates when exposed to the atmospheric environment, and the circulating water condenses with changes in water temperature. In addition, the deposition of turbid substances in the environment will accumulate a large amount of scale, rust, microorganisms, and sludge in the system. Although the chilled water system operates in a closed environment, dissolved oxygen in the water can generate corrosion products such as iron oxide when it comes into contact with the inner wall of the pipeline. Scale, rust, and other substances can clog the copper pipes and fan coil units inside the host, slowing down or stopping water circulation, increasing thermal resistance, increasing operating costs, reducing air conditioning effectiveness, and shortening equipment lifespan.

The circulating water system is medium An important part of the central air conditioning system. In the middle The central air conditioning circulating water system includes a cooling circulating water system and a freezing circulating water system. The following provides a detailed explanation of the issues present in two water systems and the solutions that should be taken.

The main problems with the cooling circulating water system are:

Air conditioning circulating water treatment:

1. Scaling caused by water concentration reduces the heat transfer efficiency of the condenser, increases system water resistance, and increases the energy consumption of the circulating pump;

2. The cooling tower nourishes a large amount of algae, mud, equipment, and pipeline corrosion.

To address the above issues, the treatment of circulating cooling water can be carried out using physical methods, combined physical and chemical treatment methods, or chemical dosing methods.

The physical processing equipment includes available circulating water side flow processors, cooling tower scale absorbers, induction water processors, electronic scale removers, ion rod water processors, comprehensive water processors, condenser rubber ball automatic cleaning devices, side filter filters, and strong magnetic water processors.

The physical and chemical combined treatment equipment includes: physical and chemical comprehensive water processor, ionization release dynamic water processor.

The chemical dosing treatment equipment includes automatic dosing devices and water softeners (used for water replenishment and softening).

The main problems with the chilled circulating water system are:

Air conditioning circulating water treatment:

1. Corrosion issues;

2. Unstable system pressure.

Corrosion problems are mainly caused by three types: microbial growth, water quality issues, and gases.

The corrosion problem caused by microbial reproduction can be treated by the following equipment:

1. Frozen water treatment - physical method:

Circulating water flow processor, ion rod water processor, comprehensive water processor, electronic water processor, electronic induction water processor, and strong magnetic water processor.

2. Frozen water treatment - combined physical and chemical methods:

Physical and chemical integrated water processor, ionization release dynamic water processor.

3. Chilled water treatment - chemical method:

Automatic dosing device:

For corrosion caused by water quality, an automatic dosing device can be used.

For corrosion caused by gases within the system, a vacuum degassing machine can be used.

The problem of unstable system pressure can be addressed by using a constant pressure water replenishment device to stabilize the system pressure.

How to evaluate What is the effect of central air conditioning cooling circulating water treatment?

1. The pressure difference before and after the condenser decreases and tends towards the pressure difference when newly installed, which proves that the scaling trend of the condenser decreases, the heat transfer efficiency is improved, and energy consumption is reduced.

2. The algae and sludge in the cooling tower gradually decrease or even disappear, indicating a continuous decrease in microbial content. Due to the reduction of biological sludge, water scaling is reduced, and the water treatment effect is significant.

3. The yellow color of the circulating water gradually becomes clearer, indicating that the corrosion of the circulating water equipment and pipelines has been contained; The corrosion inhibition effect is significant.

4. The clear and transparent circulating water indicates a significant filtering effect.

Air conditioning cooling water treatment standards and maintenance requirements

After chemical cleaning and pre film treatment, the cooling water system should meet the relevant acceptance requirements of the chemical industry standard "Technical Rules for Chemical Cleaning and Pre film Treatment of Cooling Water Systems" (HG/T3778-2005).

During the operation of the equipment, the water quality of the treated cooling water and chilled water system should meet and be maintained within the range specified in the provincial and local standard "Water Quality Standards for Central Air Conditioning Circulating Water and Circulating Cooling Water" (DB44/T115-2000):

The difference between the saturated condensation temperature of the refrigerant in the condenser and the outlet temperature of the cooling water shall not exceed 1.5 ℃.

During the normal operation of the cooling tower, there is no moss or other dirt inside the tower, no blockage in the outlet holes of the water distribution pipe or water distribution tank, and no blockage in the packing material.

5. Hanging plates are required in the air conditioning water system, and their corrosion rate needs to be lower than the standard

In the middle Cost of central air conditioning circulating water treatment:

Under normal circumstances, the equipment investment cost required for the reasonable and effective treatment of circulating water can be recovered after 3-6 months of normal operation of the equipment. In a water-cooled unit with a capacity of 1 million kcal Taking central air conditioning as an example, it can save operating costs of 200000 to 400000 yuan per year.