Solution to the problem of central air-conditioning cooling circulating water

way of solving the problem:

1. Online monitoring and sewage discharge

In actual management, due to the large changes in the cooling water load of the air conditioner and the uncertain operating time, it is often very difficult to manually manage the sewage pipe daily. The simple method is to control the concentration of the cooling water by using the water conductivity and pH as indicators. , When the concentration reaches the upper limit, the forced sewage discharge will be carried out. When the conductivity or PH value reaches the lower limit, the forced sewage discharge will be stopped.

This method realizes automatic control, and the process is as follows:

Cooling water dosing system process of Shanghai central air-conditioning project

Since the controller is controlled by a microcomputer, it can realize automatic monitoring, automatic sewage discharge, and automatic dosing. The use of this control system makes the dosage and timeliness of the medicines more reasonable. So as to more effectively control the system's fouling, corrosion and the growth of bacteria and algae.

2. Management of enrichment multiples

Under normal circumstances, the concentration factor is controlled at 3.5-4 times. Exceeding the sewage should be discharged as soon as possible to ensure normal water quality in the system.

3. Daily management

(1) Strengthen monitoring

(2) Keep the cooling tower tray clean

The open system is easy to bring dust, silt, etc. into the system and accumulate on the tray. These impurities are easy to combine with bacteria, algae and microorganisms to form slime. Therefore, the cooling tower must be cleaned once a month to prevent problems.

(3) Keep the fan coil fins clean

The fan coil is an important heat exchange device for the central air conditioning system. In summer, the condensed water makes the fins moist and easy to produce microorganisms such as fungi. In addition, the influence of dust and smoke often causes the fins to be covered by dirt, which affects the heat exchange effect. Also, the fins are relatively thick due to the small gaps , It is difficult to clean.

It is recommended to regularly use air conditioning fin cleaning agent for cleaning to maintain the heat transfer coefficient of the coil.

(4) Keep the drain pan of the fan coil unit clean

The fan coil water pan is a device to drain the condensed water from the coil. Due to the reproduction of microorganisms and the formation of slime, condensed water vapor often overflows, causing unnecessary losses to users. Especially in high-end hotels and restaurants, it not only damages the perfection of interior decoration, but also increases the labor and maintenance costs of dredging the drain pipe of the water receiving tray.

It is recommended to use pipelines to pass the agent regularly to keep the drain pipe of the water receiving pan unobstructed.

(5) Seriously do winter maintenance work

During the non-use period of Gree's central air-conditioning cooling and refrigeration cycle system, the cooling water is generally discharged to prevent accidents such as freezing and cracking equipment and pipelines. However, in winter, the metal surface of the equipment reacts with oxygen in the air to easily cause the equipment to rust, so the system must be maintained. It is recommended to use DA-505 central air conditioning moisture preservative to maintain the equipment. The product has the characteristics of strong medicinal effect, easy operation, low investment, high benefit, and long-lasting protective film (6-8 months).

(6) Do the system cleaning and pre-filming work before starting up

The purpose of pre-filming is to form a complete and corrosion-resistant protective film on the active metal surface that is in an activated state after cleaning, before putting it into normal operation.

(7) Timely maintenance of equipment

Prevent dripping and leakage of the water system. If there is running water, replenish the medicine in time.

4. Swirl filter

After many tests, we proposed to add a cyclone filter water cleaner to the original automatic monitoring, automatic dosing, and automatic sewage discharge to reduce suspended solids and turbidity, thereby making the effect of corrosion and scale inhibitors To achieve better, and reduce the amount of sewage, to achieve the purpose of saving water and cost.

(1) The cyclone filter water cleaner adopts the method of one-stage centrifugation and two-stage filtration to remove large and small particles in the water, and cleverly connects with the pipeline in parallel with the water pump, which can make full use of the pump lift to overcome the resistance of the equipment . Swirl filtration adopts pure mechanical working principle, which has no adverse effect on equipment and system. The filter adopts synthetic organic materials, which has the characteristics of low filtering resistance and high dirt holding capacity.

(2) The effect of the cyclone filter on the removal of suspended matter: the effect of the filter on the removal of suspended matter is very obvious.

(3) The influence of cyclone filter on turbidity: the filter can also remove turbidity obviously.