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Excessive air volume in engineering design and installation of air conditioning system will increase the noise of the fan. Therefore, the room served by an air conditioning system should not be too much. The system with large air volume should be divided into several small systems, so that not only the noise of the system will follow the air volume. The reduction is made, and the air conditioning system is flexible and easy to adjust. In addition, under the premise of meeting the requirements of use, when the initial temperature of the hot and cold medium is allowed, the temperature difference between the sending and returning air can be increased to reduce the air volume of the system and reduce the noise. In order to reduce the noise generated by the operation of the fan itself, a high-efficiency, low-noise fan should be used. When the air volume of the air-conditioning system is constant, it is necessary to try to reduce the pressure loss of the fan and use the fan with a lower rotation speed. In addition, the suction and delivery of the fan The outlet should maintain a good airflow state. It is generally considered that the fan outlet fan duct is in a horizontal direction, a forty-five degree angle, and a vertical direction. The inlet and outlet of the unit should be provided with a flexible joint, and the end of the hose from the fan outlet. The length of the straight pipe (L) to the airflow turn should be more than 1.5 times longer than the large side of the air duct, and the regulating valve should be installed after the sharp turn of the airflow. If it is installed on the straight pipe section of the fan air outlet, the fan will be Performance is reduced. In addition, the connection mode between the fan and the motor should be improved, the transmission noise of the pulley is large, the coupling is second, and the noise of the direct transmission is the smallest. The pedestal shared by the fan and the motor must use the vibration reduction pedestal if the equipment is hoisted on the roof truss or Under the slab, a vibration-damping hanger should be provided, and the fan itself should also be silenced. Also, a muffler should be installed on the delivery and return air mains of the system.
The materials of adjustable parts such as valves and tuyères should be firm and not vibrating. The production of ducts should avoid sudden changes in area and strengthen the places with poor strength. Thick places such as tees and elbows that are prone to airflow disturbances and eddy currents should be thick. For the production of steel plates, guide vanes should be provided at the sharp turn of the airflow. The valves on the pipeline should not be set more, and the distance between the straight pipes of the ducts is 5-10 times between the valves, because the valves are too dense. Not only increases the system resistance, but also causes an increase in airflow noise. A loud noise in engineering design and installation caused a devastating accident. Frightened the staff, please ask me to send someone to repair the equipment. The above are some of the key technical issues encountered during the design, installation and commissioning of the ammonia screw refrigeration station during my time as a refrigeration technology consultant at the headquarters of Meideng. It is worth noting that the welding quality of the refrigeration pipeline must be strictly required; the second is that the refrigeration engineering design should be reviewed by Party A before construction to prevent future problems; the third is to comply with the system, whether it is engineers, experts, Professors are not allowed to operate the equipment without obtaining an operator's employment certificate (although these professional and technical experts can guide the work and modify the design). Even if you get a job certificate for a model, you can only operate within the scope of application, otherwise it is easy to accident.
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