Energy saving in air purification engineering
Air conditioning purification is a project with large energy consumption. Energy saving measures should be paid attention to in design and construction. In design, system and regional departments, air supply calculation, measurement of temperature and relative humidity, determination of cleaning level and air change, air ratio, pipeline insulation, leakage rate caused by air duct bite, influence of air resistance of main branch connection, leakage of flange joint and selection of air conditioning box, such as fan, chiller and other equipment are related to energy consumption, these details must be considered.
This kind of pipeline needs both economy and efficiency
In the centralized or air-conditioning purification system, the requirement of the pipeline is economic and effective air supply. The requirements of the former are low price, convenient construction, high operation cost and small internal surface resistance. The latter refers to strict and good, no air leakage, no dust delivery, no dust collection, no pollution, fire prevention, corrosion resistance and moisture resistance.
In operation, sometimes the local resistance of pipe fittings is much higher than that along the pipeline, which needs to be improved. Pipe fittings mainly include elbow, reducing tee, cross, etc. The radius of curvature of the elbow Center shall be greater than the side length of the rectangular pipe, and the circular diameter shall be 1.25 times. Guide vane should be added to large section air duct to reduce resistance. But in the actual installation and construction, such treatment is less. For the reducer, it is impossible to change the pipe diameter suddenly, so the reducer should be used. The expansion angle of each side of the reducer shall be greater than 15 degrees, and the expansion angle of each side of the reducer shall not be greater than 30 degrees. The tee pipe of rectangular air duct shall be divided by bending along the air flow bending pipe, and the branch pipe shall also have a certain radius of curvature. If you want a 90 degree angle separation, use a guide vane at the elbow.
Select air conditioning cabinet according to climate conditions
As for the selection of air conditioning box, the climate environment should be considered. If the temperature is low in winter and the air dust is in the north, the new air preheating section shall be added to the general air conditioning unit, and the spray air treatment method shall be adopted to make it not only wash the air dust, but also generate heat and exchange temperature to the required temperature and humidity. In the humid climate, the air dust concentration in the south is very low, and there is no need to preheat the fresh air in winter. Air filtration and temperature and humidity adjustment mainly use filtration, cooling surface temperature and humidity adjustment, and can also strengthen the temperature dehumidification process, and then through the medium filtration efficiency and terminal filtration efficiency or sub high efficiency. It is better to use variable frequency fan for the matching fan of air conditioning box, which can not only save energy, but also flexibly adjust the air volume and pressure.
Automatic control device, fully regulated
At present, some manufacturers use the manual mode to control the air volume and air pressure adjustment, but because of the control of air volume and air pressure control valve technology layer, the ceiling is also the soft upper limit of color steel plate, mainly in the installation and commissioning adjustment, because most of them are not adjusted, in fact, they cannot be adjusted. In order to ensure the normal production and work of the dust-free workshop, a set of relatively complete automatic control device shall be set to realize the following functions: air cleanliness, temperature and humidity, pressure difference monitoring, air valve regulation; temperature, pressure and flow detection of high-purity gas, pure water and circulating cooling water; gas purity and pure water quality monitoring.
The air filter in the air-conditioning purification system increases with the increase of operation time. It is necessary to adjust the air valve in the system to maintain the air volume. During the system commissioning, in order to make the fan start without load, it is necessary to close the air valve at the air outlet of the fan. After the fan is started, it is difficult to start the fan due to the excessive pressure of the air valve. The air supply volume is easy to adjust and the air supply pressure is stable.
These monitoring devices can be designed as single system measurement and control system, or distributed computer control and management system. When the air conditioning purification system is closed, there is no wind or over temperature, the electric heater will continue to send electricity for heating, causing equipment damage or even fire. In order to avoid this kind of situation, no wind and over temperature power-off protection should be set.
No telephone and fire alarm equipment
The telephone and walkie talkie in the dust-free workshop can reduce the number of people walking in the clean area, reduce the amount of dust, and timely contact with the outside in case of fire, so as to create conditions for normal working contact. In addition, a fire alarm system should be established to prevent the fire from being difficult to be found outdoors and causing significant economic losses.
Multiple chillers are more flexible
If the chiller needs large cooling capacity, it is not suitable to choose a single chiller. Adopt multi mechanism and frequency control to reduce starting power. Many machines can be used flexibly to avoid wasting energy.
The air conditioning room should be on one side of the purification room
The air conditioning room shall be located on one side of the purification room, which can not only save energy, but also facilitate the arrangement of air duct, make the air supply more reasonable, and save the project cost.
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