Civil building HVAC ventilation system construction program?

Civil building HVAC ventilation system construction program specifically what is included, the following in the consulting bidding teacher for you to answer for reference.

Civil building HVAC system is to ensure that the civil building to play the effect of the basic composition, HVAC installation design is reasonable or not will have a direct impact on the performance of the entire system. Therefore, the design and construction process must be strictly controlled to ensure the quality of equipment, piping installation. Based on this, each link of HVAC construction must be quality supervision, by improving the level of technology, construction technology, to ensure that the equipment operation, to avoid system failures and hidden dangers. The article through the combination of air conditioning system practical experience, the installation of the construction process of the existence of several technical difficulties were analyzed, and based on this proposed several optimization measures.

1 equipment noise treatment

HVAC system, although the civil building function plays a huge role in the realization, but the noise problem also brings a lot of trouble to the owners of civil buildings, serious noise problems and even affect the normal activities of the residents as well as physical and mental health. In order to be able to solve the HVAC noise problem as far as possible, it is necessary to do a good job in the installation design process to prevent and treat. And this point needs to be installed from the pipeline, equipment installation and wind system, bracket installation four aspects of processing. Here are some noise treatment measures for these four points.

1.1 piping installation

HVAC system piping installation in civil buildings must be in strict accordance with the relevant national norms, air conditioning cooling water piping and chilled water piping needs to be used spring damping bracket, and the bracket needs to be fixed as far as possible on the beam, or fixed to the channel steel beams set up between the beam and the beam. The pipeline through the wall or floor and other structures, must use the metal casing, and in the casing, between the water pipe also need to use fire-retardant materials for sealing treatment.

1.2 Installation of equipment

The installation of equipment can be used in the following ways to reduce the noise generated by the operation of the equipment: air conditioning equipment can be used in the installation of spring damping shock absorbers, such as the installation of new air conditioning and air-conditioning units. While in the fan and duct connections can be used to reduce wind noise in the form of soft connections, fan sets with the water pipe connection is the use of flexible connectors for connection, the use of spring hooks to reduce the noise radiated by the fan coiler, while the fan coiler with the water pipe between the use of hose connection. The entire air conditioning room can do sound-absorbing treatment, such as the use of acoustic materials in the room at the installation of the enclosure, or in the room walls set up sound-absorbing materials to avoid the noise generated during the operation of the equipment outside.

1.3 Installation of wind system

The air duct is the structure that is most likely to produce noise, and it is also the structure that is most likely to affect the owners of civil buildings. Therefore, air ducts must be designed and installed in strict accordance with relevant technical standards and quality standards. Noise prevention and control of air duct system can start from the following aspects: the fresh air inlet can be utilized muffling louver structure, and the impedance muffler installed in the fan's import and export, while some parts that will often produce noise should be pre-installed muffler, duct elbow at the elbow of the whole into muffling elbow. In addition to the outside of the muffler can be utilized in high-quality insulation materials, its internal paste sound-absorbing materials can effectively reduce the impact of noise.

1.4 Installation of bracket

Noise will be spread to the outside through the freezing main pipe, and it will also bring a certain impact on the operation of the equipment. After experimental research, it can be improved by improving the rigid bracket, adding shock absorbers, such as spring dampers, etc., to the rigid bracket of the main pipe to absorb the noise and pipe vibration, and to avoid the propagation of noise between the floor and the bracket.

2 Analysis of the smoke exhaust system

With the expansion of the scale of civil buildings, people's requirements for the building environment also continue to improve. HVAC system as a civil building internal environment regulation system in addition to the need for temperature, humidity regulation, but also need to design the most reasonable smoke exhaust system. In order to improve the safety of civil buildings, this is the HVAC installation designers must pay attention to the content. Need to comprehensively analyze the building structure and the distribution of air conditioning systems to fire safety, ventilation system safety as a guarantee, the design of a scientific and reasonable smoke control system. The following pipe production and construction of smoke evacuation system related content is analyzed.

2.1 Material Requirements

Smoke exhaust pipe body, as well as the frame and fixed materials, flexible joints and other structures must use non-combustible materials. If there are combustible materials in the ceiling of the building, the smoke exhaust pipe in the ceiling should be insulated, using non-combustible materials to set up a heat insulation layer, and keep the distance between the combustible materials is greater than 150mm.

Positive pressure air supply pipe. Air supply pipe should be non-combustible material pipe, if the duct material is metal, then the duct wind speed should be controlled below 20m/s; if the pipe is smooth concrete and other non-metallic, then the duct wind speed should be less than 15m/s. If the pressurized air supply pipe may pass through the fire hazardous area, then the air duct fire-resistant level should be higher than 1h. In addition to the air supply wells should be used as a fire-resistant level of higher than 1h material as a partition, the wall must be set access door, but the door of the access door must be set to the fire-resistant level of higher than 1h. Set up access door, but the door fire level should be higher than class C.

2.2 System Installation

The air supply and smoke exhaust ports should be reliably fixed at the design point, and the smoke exhaust ports should be set up in the smoke storage warehouse. The mechanical transmission parts of the air supply valve and smoke exhaust valve should operate reliably and ensure that they do not slacken or fall off. The action signal given by the fire control center must be able to make the air supply and smoke exhaust system act. There should be no deflated and dead bends in the pre-buried pipes, and the connection of air outlets and ducts should be firm and tight, and the borders should be affixed with the surface of the building, and the outer surface should be smooth.

3 Solve the problem of circulating water condensation

In the operation of the HVAC system, the air conditioning circulating water in operation often appears water condensation phenomenon, especially in the winter, this phenomenon is more serious, which has an impact on the air conditioning system. For this reason, measures must be taken. When designing the pipeline, the length and slope of the pipeline should be suitable, otherwise the phenomenon of water dripping will occur. The installation and arrangement of the piping should be suitable for the discharge of condensate as soon as possible, and water sealing devices can be set up if necessary. Focus on material insulation. Air ducts and chilled water pipes must pay attention to insulation, pipe insulation must grasp two aspects, one is to ensure its integrity, the other is airtight. The integrity of pipe insulation requirements do not allow the existence of cold loss, once there is cold loss of surface, should be thermal insulation material laying heat insulation treatment. The insulation of the airtightness is required to ensure that so the insulation level are not allowed to have any damage, must ensure that the seal is not airtight.

4 Improve the professional contact

Since the HVAC system in the actual installation process needs to be involved with a number of specialties to cooperate with each other. Such as civil construction, decoration, piping, electricity and so on, so if you want to ensure that the installation of HVAC systems can achieve the desired results, in addition to the installation of the relevant technical measures and methods of attention to the profession, but also need to strengthen the cooperation with other related professions.

4.1 Technology

Ventilation ducts in the floor and wall hole size needs to be provided in advance to the civil engineering professionals, and will be the location, size in the construction drawings show. If this aspect of the handover is not in place there may be a later need to cut holes again, increasing the construction difficulty and construction costs, and even some locations will have an impact on the structural strength of the building. For example, large air conditioning equipment lifting holes, various types of pipeline holes, pre-embedded work if you can not deal with properly in advance, later will bring great trouble to the construction side.

4.2 Equipment

Beam lifting is the traditional way of laying pipes, if the number of laying pipes are more, then the inevitable need to increase the height, but the location of the pipeline is relatively centralized, if you raise the height of the whole floor is obviously not economical. Modern civil construction more than the use of pre-buried piping to solve this problem, that is, the design of the beam in the reserved space for pipe laying, that is, the pre-buried casing, so many of the diameter of the pipe can be laid through the beam, not only to solve the problem of lifting, but also to further save space. Of course, this laying method must be considered in advance of the beam bearing range, without affecting the overall structural strength of the building under the state of pre-buried casing. In addition, the building doorway beams, aisles and floor slabs will also be pre-embedded casing. If the civil building structure is complex, and the construction period is long, the construction period will inevitably encounter modification of the pre-embedded structure or the need to add the problem of the pipe, so the doorway, aisle and floor pre-embedded pipe can play a role. In addition, in the beam buried metal casing, can play a role in a certain degree of reinforcement, if there is no pre-buried metal pipe directly chiseling hole is bound to affect the stability of the building structure.

5 Conclusion

Through the above analysis, it can be seen that the HVAC installation of civil buildings for the realization of the function of the significant, is one of the important content of the construction, and the installation of a number of specialties with the construction of the content of the intersection, only closely linked to the various specialties, in order to truly ensure the quality of the HVAC installation construction, play the role of the HVAC system. In addition, the construction must pay attention to deal with circulating water and noise problems, these are technical difficulties in construction and construction focus, construction personnel and designers must pay attention.

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