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Main points of Dongguan air-conditioning system


I. Air conditioning purification needs to pay attention to energy saving Air conditioning purification is a large energy consumer, and attention needs to be paid to energy saving measures during design and construction. In the design, the division of the system and area, the calculation of the supply air volume, the determination of the temperature and relative temperature, the determination of the cleanliness level and the number of ventilations, the fresh air ratio, the insulation of the air duct, and the form of the mouthpiece in the production of the air duct on the leakage rate The influence, the influence of the connection angle of the main pipe branch on the airflow resistance, whether the flange connection is leaking, and the choice of equipment such as air conditioning boxes, fans, and chiller units are all related to energy consumption, so these details must be considered.

Second, the selection of air-conditioning boxes based on climatic conditions With regard to the selection of air-conditioning boxes, consideration should be given to the climate environment. For example, in northern areas with low winter temperatures and high air dust content, a fresh air preheating section should be added to a general-purpose air-conditioning unit, and a water spray air treatment method should be used to wash the air and generate heat and temperature. Reach the required temperature and humidity. In the southern regions where the climate is humid and the dust concentration in the air is low, there is no need to preheat the fresh air in winter, and the initial filtration is used for air filtration and temperature and humidity adjustment. Temperature and dehumidification process, and then through intermediate efficiency filtration and terminal high efficiency or sub high efficiency filtration. It is best to use a variable frequency fan for the fan of the air conditioner. This not only saves energy, but also flexibly adjusts the air volume and pressure.

Third, the requirements of air ducts focus on economics and efficiency in centralized or purified air conditioning systems. The requirements for air ducts are both economical and effective in supplying air. The former requirements are reflected in low price, convenient construction, running cost, and smooth internal surface and low resistance. The latter means good tightness, no air leakage, no dust generation, no dust accumulation, no pollution, fire resistance, corrosion resistance and humidity resistance.
In operation, sometimes the local resistance of the pipe is much higher than the resistance along the air duct, and this situation needs to be improved. Pipe fittings mainly include elbows, reducers, tees and crosses. The center curvature radius of the curved pipe should be greater than the side length of the rectangular duct, and the diameter of the circle should be 1.25 times. For large-section air ducts, a deflector should be added in the duct to reduce the resistance. In actual installation and construction, this is rarely done. For the reducing pipe, the diameter cannot be changed suddenly, and it should be made into a gradually expanding (shrinking) pipe. The expanding angle of each side of the expanding pipe should be greater than 15 °, and the shrinking angle of each side of the reducing pipe should not be greater than 30 °. The tee of the rectangular air pipe must be bent and diverted along the air flow, and the branch pipe should also have a certain radius of curvature. If you want to divert at 90 °, you should add a deflector in the elbow.

Fourth, the multi-machine chiller is more flexible. If the chiller requires a large cooling capacity, it is not suitable to use a single machine, multi-mechanism should be used, and the motor should use variable frequency speed regulation to reduce the starting power. Multiple machines can be used flexibly, so there is no waste of energy in the "big horse-drawn cart".

Fifth, the air-conditioning room should be located on the side of the clean room, and its location should be on the side of the clean room. This will not only save energy, but also help the layout of the air duct, and make the air flow organization more reasonable. At the same time, it can save engineering costs.

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