Detailed explanation of some air conditioning and refrigeration methods in data center computer rooms
Option 1: Condensation and dripping
There are many reasons for the condensation and dripping of the air conditioning system during debugging and operation. In summary, the main reasons are: pipeline installation and insulation problems, and the connection between pipelines and fittings, and pipelines and equipment is not tight. The main cause of water leakage is that the pipeline installation did not strictly follow the operating regulations, the quality of the pipelines and pipe fittings was inferior, the serious inspection was not carried out when entering the site, and the system did not conduct the hydraulic pressure test strictly according to the specifications. Because the condensate pipeline was too long, it was The ceiling collision or slope is difficult to guarantee or even the condensate pipe falls down to cause dripping. The condensate pipe of the air-conditioning unit is not equipped with a water seal (negative pressure) and the air-conditioning condensate of the unit cannot be eliminated. Drain the condensate nearby to avoid the condensate pipe falling down and accumulating water or "fighting" with the hanging item; the cabinet machine condensate pipe should be sealed according to the negative pressure in the machine to make the condensate drain unblocked.
The main solutions to the above problems:
1. Insulation protection sleeves are added to the refrigerated pipes in the wall part to ensure the continuity and tightness of the insulation layer in the wall part.
2, Before strengthening the ceiling and sealing plate, clean up and check the debris in the fan coil drip tray and other places. The fourth is to strengthen the protection of the equipment drip tray, especially the inspection before hanging items and sealing plates.
3. Strengthen the on-site inspection of thermal insulation materials, strengthen technical disclosures before construction and inspections during construction. It is strictly forbidden to use large thermal insulation sleeves to cover small pipes, and increase the thermal insulation quality of elbows, valves, flanges and equipment interfaces. Control the intensity to ensure that the insulation layer is closely integrated with the outer wall of the pipeline.
Option 2: Water circulation of air conditioning water system
The most critical link in the construction of the central air-conditioning of the water system, construction problems will directly affect the normal operation of the system. The most common problem of the central air-conditioning chilled water system is the poor circulation of the chilled water system pipes, which causes the poor circulation of the pipes:
1. The air conditioning water system pipes are not cleaned cleanly, which directly causes the air conditioning water system to block
The treatment method is to strengthen the pre-construction management, reasonably arrange the pipeline elevation and slope, try to avoid the air bag phenomenon, and set an exhaust valve at the unavoidable air bag position and connect the exhaust pipe outlet to the exhaust point of the system.
2. Due to the crossing of professional pipelines, the pipeline was not coordinated and handled properly during the construction, resulting in many air bags in the pipeline network, which affected the pipeline network circulation.
There are several preventive work to be done during the construction process: first, the dirt and rust spots must be removed mechanically or manually before the welded steel pipe is installed. When the inner wall of the pipe is cleaned, the pipe mouth should be closed for installation. During the pipeline construction process, the unclosed pipe openings should be temporarily blocked to prevent dirt from entering, and the welding slag and hemp wire should be cleaned up in time when the pipe is connected.
Install a relatively large blowdown valve at the lowest point of the pipe network. If the blowdown valve is too small and the blowdown effect is poor, the number of cleanings will be more; if the blowdown outlet is not at the lowest point, the blowdown will be incomplete. Temporary filters and bypass flushing valves should be appropriately added during the installation of the pipe network. Before connecting the equipment, the equipment should be cleaned in sections in combination with the water pressure test. After the cleaning work is completed, a trial run of the water system cycle is required. The purpose is to flush and concentrate the dirt in the pipe network to the filter, and then remove the dirt from the filter.
Plan 3: Pipeline and equipment positioning and elevation crossing
Nowadays, computer room air-conditioning engineering design drawings are basically drawn by CAD. Although the installation professional design has made a preliminary plan for the elevation of the pipes and equipment before drawing the construction drawings, the detailed proofreading is often not carried out before the construction drawings are produced, which often causes various problems. The elevation and positioning of pipelines in professional construction drawings are severely crossed, causing great difficulties for project quality management and coordination.
The height of the suspended ceiling largely depends on the size of the duct section in the height direction. The duct line should not be too long, otherwise the construction will be difficult and other pipelines will be difficult to arrange. For example, the largest air duct cross-sectional area in a shopping mall is 2400mm×500mm. If the air duct cross-sectional area is large, the machine room must be large. If the machine room is large, the noise will be high and the return air organization is difficult. If the air duct is short, the power of the fan can be smaller. In this case, a horizontal unit can be used for mounting, and the machine room setting is more flexible. In addition, the duct laying in the suspended ceiling should also:
1. The architectural professional design shall have a comprehensive understanding of other professional piping requirements in order to reasonably determine the floor height and arrange the pipeline:
2, try to change the size of the pipe section according to the change of air volume to facilitate decoration and increase the height of the ceiling locally;
3. The return air duct should be located in the same plane. When it is difficult to arrange the return air duct, the space in the ceiling can be used instead of the return air duct.
4. Comprehensive pipeline engineering design should be carried out for various pipelines in the building, and comprehensive pipeline drawings should be provided for complex buildings.
In summary, the improvement of the ceiling height of the building depends on various efforts. In view of the above problems, comprehensive pipeline design should be carried out. The so-called comprehensive pipeline design is to arrange all pipeline projects in the building in a unified manner to facilitate the discovery of various pipeline projects The problems in the design will be discussed and resolved with relevant units, so that the various pipelines occupy a reasonable position in the construction space, and create conditions for the construction, operation, use, and maintenance management of the pipeline project. According to the different pipeline performance and purpose, the building The pipelines can be roughly divided into the following categories:
1. Reclaimed water pipeline
includes reclaimed water collection and reclaimed water supply;
2, gas pipeline
There are gas fuel and liquid fuel;
3, water supply pipeline
includes domestic water supply, fire water supply, production water, etc.;
4. Drainage pipe
includes domestic sewage, domestic wastewater, fire drainage, rainwater, other drainage, etc.;
5, heat pipe
includes the steam or hot water required in heating, hot water supply and air conditioning equipment;
6, air duct
includes all types of air ducts in ventilation engineering, air conditioning systems, and compressed air pipes required by certain production equipment:
7, power supply and distribution lines or cables
includes power distribution, lighting distribution, and weak current system power distribution, among which the weak current part includes shared TV antennas, communications, broadcasting, and fire alarm systems.
Therefore, to rationally arrange various professional pipelines to increase the effective use of space in buildings requires close cooperation and coordination with relevant professional designers. Under the unified coordination of the construction unit, each construction unit and decoration unit will finally check in a unified manner to meet their own technological requirements, so that the building can meet the requirements of economical, reasonable, hygienic and comfortable, and the height of the hanging items can be increased under the premise of the decoration effect.
