Importance of cleaning water system of central air conditioning
In the normal working process of central air conditioning, there will be scale, algae, biological slime, rust and other metal corrosion products in the water system. These substances continue to accumulate in the condenser, heat exchanger, fan coil inside and in the pipeline, forming a smaller pipeline flux, which affects the heat transfer effect. Moreover, because of the low thermal conductivity of the dirt, when the dirt deposits are covered in the heat exchange surface of the heat exchanger, it will increase As a result, the pressure of the condenser increases, the refrigeration effect decreases and the power consumption increases greatly. The fouling also accelerates the corrosion and shortens the life of the central air conditioning unit. Therefore, in order to save power and extend the service life of central air-conditioning units, central air-conditioning cleaning is beneficial to the country and self.
During the working process of the central air conditioner, scaling, rusting, cooling effect decline, power consumption rise, and even high-voltage tripping phenomenon occurs. After perfect cleaning, the cooling effect of the central air conditioner is significantly improved, saving the working time of the compressor, saving 10-30% of the power consumption of the unit, and extending the service life of the unit. For example, it takes ten minutes for a room to fall to the set temperature before the central air conditioner is cleaned, and it takes only seven minutes for the central air conditioner to fall to the set temperature after cleaning, so the compressor can work three minutes less, and then save 30% of the electricity. The current situation in China is: the refrigeration effect of many central air conditioners is not good, resulting in extended tightening time and waste of electricity. After cleaning the central air conditioner, the air conditioner can return to normal refrigeration effect, shorten tightening time and save 10-30% of electricity.
A millimeter of scale will reduce the cooling capacity of the central air conditioning unit by 20% - 40%, increase the condenser pressure, increase the motor load, and consume 20-30% more electric energy. If the capacity of the unit is 1 million kcal, the energy efficiency ratio of the equipment is 3.2kw/10000 kcal, the average load is 80%, and the unit works for 5000 hours for 10 months in a year, the additional power consumption in a year is 100 × 80% × 3.2 × 5000 × (10-30)% = 128000-384000 kwh, and the annual waste of electricity is 102400-307200 yuan based on 0.8 yuan per kWh. This waste is immeasurable and intangible.
1、 Importance of central air conditioning water system cleaning
The water system of central air conditioning is divided into cooling water system and chilled water system
1. The cooling water system mainly relies on the cooling tower to dissipate heat. The water in the cooling tower will fully contact with the air due to splashing and activities, and then bring a lot of dust, microorganisms, soluble salt and corrosive gas into the cooling tower, so that the concentration of water impurities is increasing, which brings a lot of harm to the work of the central air conditioning system.
Harm performance: dust, salt, bacteria, dissolved oxygen, etc. → scale, bacteria, algae, rust residue → accumulation in the main machine copper tube, filter → slow circulation → poor heat dissipation effect → poor refrigeration effect → waste power → shorten equipment life.
The refrigeration system is a sealed system, which accumulates a lot. The dissolved oxygen in the water is very simple, which results in the blockage of the coil, the corrosion of the unit and pipeline accessories, and then the attenuation of the cooling capacity and the premature damage of the equipment, which directly affects the normal work of the central air conditioning system.
The harm performance: water corrodes the inner wall of the pipe, causes rust and slag, blocks the main engine coil and fan coil, causes the coil to burst or has no refrigeration effect, wastes power and shortens the service life of the equipment.
2、 Cleaning principle of central air conditioning water system
1. After participating in the sterilization of slime stripping agent to the circulating system, all kinds of bacteria and algae in the circulating water were eradicated.
2. Participate in stripping agent to peel and fall the biological slime in the pipeline, and clean the biological slime through circulation.
3. Participate in the chemical cleaning agent (cleaning agent for central air conditioning), clean the floating rust, scale and oil in the pipeline system, discharge them loosely, and restore them to the cleaned metal surface.
4. Put in pre filming agent to form a fine polymer protective film on the metal surface to prevent corrosion.
5. Participate in corrosion inhibitor to prevent metal rust, and participate in scale inhibitor together. After summarizing the effect, prevent calcium and magnesium ion crystallization accumulation. And punctual sampling inspection, monitoring water quality.
After the first year of operation, the energy efficiency ratio of general air conditioners will decrease by 8%; after three years of operation, the energy efficiency ratio of air conditioners will decrease by 25%. According to the inquiry of more than 300 star hotels across the country, all kinds of central air conditioners used in hotels will be obviously attenuated after working for a period of time. The energy efficiency ratio of central air conditioners working for a long time can be attenuated by more than 25%, which constitutes a waste of power expenditure of the users.
The condenser of the central air conditioning unit has scale, the pressure is high, the exhaust temperature increases, the high-pressure protection equipment of the unit initiates, which makes the central air conditioning stop automatically; some water temperature of the evaporator of the central air conditioning unit is lower than the set temperature (condensation), the low-temperature protection equipment initiates, which makes the central air conditioning stop automatically; the temperature difference of the cooling water in and out of the central air conditioning unit is lower than 2 ~ 2.5 ℃, The cooling tower of central air-conditioning has bacteria, algae and scale formation, blocking the condenser pipeline, high-pressure shutdown;
The temperature difference between the inlet and outlet water of the central air conditioning unit is lower than 2 ℃, The results show that the cooling capacity can not be released, and the air conditioning effect is poor; the temperature of the cooling water of the central air conditioning unit can not drop down, and can not reach the set temperature of the unit, and the air conditioning effect is poor; the cooling water temperature of the central air conditioning unit can reach 7 ~ 8 ℃, but the air conditioning effect is still not good; the aluminum fins of the central air conditioning unit stick dust, and the heat dissipation effect of the air conditioning is not good.
The scale in the fan coil of the central air conditioning is attached to the pipe wall, blocking the filter, reducing the flow and heat transfer effect; some rooms have good air conditioning effect, while others have poor air conditioning effect; some rooms have large air volume, but high indoor temperature, and no cool air; when the central air conditioning is on, there is abnormal smell in the room, and the air quality is poor; the condensate in the water collecting pan of the central air conditioning overflows Come out, make housetop water leakage form decorate damage.
The water quality of central air conditioning refrigerant is yellow or black, and the accumulation is serious; the unit pipeline equipment is seriously corroded. The fan coil units and blades of central air conditioning are covered with dust, and the air volume at the outlet becomes smaller.
The newly installed central air-conditioning system has been working for less than a year, and the above-mentioned questions have arisen. The appearance of many bad working conditions makes the central air conditioning can not work normally. If your central air conditioner has one of the above questions, it is generally caused by non mechanical failure factors, so you should do central air conditioning cleaning and central air conditioning water treatment.
