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Project Category

Main project classification

Shenzhen ventilation project, professional environmental protection air conditioner, negative pressure fan project


1 Common problems in heating ventilation and air conditioning installation

The problem of positioning of pipelines and equipment and the intersection of elevations. In current domestic heating and ventilation and air-conditioning projects, design drawings are mostly drawn using CAD software. In the early stages of the design of related projects, the positioning of relevant pipelines and equipment must be determined. Elevation, but due to the effects of preliminary survey work, calculation methods, review and other factors, the positioning and elevation in the design drawings often have problems that are not well adapted to the actual installation environment. In particular, the occurrence of pipeline and equipment positioning and elevation crossing will seriously affect the quality of the installation project. If the pipelines and equipment in heating and ventilation and air-conditioning installation have positioning and elevation crossing problems, the installation may be affected or even appear. Rework phenomenon.

The problem of water circulation of air conditioners. In the heating and ventilation and air conditioning installation projects, the water circulation problems of air conditioning chilled water systems are more common, and the pipeline circulation effect is ultimately poor. The main causes of water circulation problems of air conditioners are: the water circulation pipes of air conditioners intersect with other professional pipelines, and the effective coordination and treatment are not carried out during the installation process, which affects the circulation effect of the chilled water system; The pipes of the system have not been cleaned or are not thoroughly cleaned, causing the pipes to be blocked to varying degrees, restricting the water circulation effect of the air conditioner, and the cooling effect of the equipment will also be affected.

The problem of dew condensation on the equipment. In the installation of heating ventilation and air conditioning, effective processes and technical measures must be taken. The cause of the problem of dew condensation on the air conditioning system during operation can be summarized as follows. During the installation, the relevant operating procedures could not be strictly implemented; the quality of materials such as pipes and fittings used in the installation project did not meet the standards, and no strict quality inspection was performed when the materials entered the site; due to the long condensate pipeline of the air conditioning system, During the installation process, it may collide with the ceiling, or it is difficult to ensure its slope, which will cause dripping of the condensation pipe of the air-conditioning system. The thickness of the insulation material does not meet the standards, which will cause the exterior temperature of the insulation material to reach the dew point temperature during operation. The phenomenon of dripping water.

Some construction units only care about one-time investment control, ignore the running cost of the air-conditioning system after completion, and ignore the energy-saving requirements of the air-conditioning system. Most of these reasons are caused by the inconsistency between investors and users. This situation makes some air conditioning systems lack the necessary energy-saving automatic control facilities. The operation and management level of some air-conditioning systems is low. Although the design of the air-conditioning system is reasonable, the operation and management level cannot keep up and waste energy. Many units share a set of air-conditioning systems, and do not install air-conditioning billing systems. They simply share air-conditioning operating costs by area, causing human waste.

2 Control elements for heating and ventilation

2.1 Room temperature setting

Determining a reasonable indoor temperature is an inevitable requirement for establishing a scientific and reasonable building indoor heating and ventilation system after the installation and operation of the air-conditioning system. For most air-conditioning systems, if the temperature is too high in winter, it will consume more heat. Lowering the temperature in summer will also consume more cooling. Therefore, the heating and ventilation system should be established according to the actual temperature requirements of the room. On the basis of meeting the basic temperature setting requirements, the temperature and humidity generated in the building's interior should be increased as much as possible, and in winter, it should be reduced as much as possible. The larger the fixed interval, the more effectively the energy consumption of the air conditioning system can be saved.

2.2 Controlling outdoor fresh air volume

Through reasonable outdoor fresh air volume control, a good ventilation and heating system is established for the building. The outdoor fresh air volume control and utilization of the air conditioning system can effectively save the energy consumption of the air conditioning system. The greater the fresh air volume of the air conditioning system, the greater the energy consumption of the system. Therefore, the outdoor fresh air volume should also be controlled to the minimum required by the end. Generally speaking, the minimum fresh air volume of the air conditioning system in winter and summer is set according to the health requirements of the body to dilute harmful substances, compensate for local exhaust, and ensure a certain positive pressure value of the air-conditioned room. The effect of dust and odor in the current room is small, and corresponding purification devices can be configured at the same time. Therefore, under the current situation of relatively tight energy sources, the original minimum fresh air volume standard should be determined, but its value has not yet been reached. Consistent effect. Under the environment that can predict the customer, the fresh air valve of the air conditioning system can be manually adjusted to achieve a certain energy saving effect.

2.3 Correct use of fresh air volume

For continuously operating air conditioning systems, in addition to using fresh air for energy saving in winter and summer, new components should also be used correctly during the corresponding transition season. When the temperature is low in the transition season, outdoor fresh air should be fully used as a cooling source for the air conditioning system. . For indoor cooling air in winter and transition seasons, you can choose to use the cooling capacity of outdoor fresh air, so as to introduce outdoor fresh air, shorten the use time of artificial cooling sources and air conditioning systems, and achieve natural ventilation and heating. In a system that has both temperature and humidity adjustment requirements, the installation and replacement of working conditions can be effectively adjusted and controlled according to the outdoor dry bulb temperature and return air temperature.

3 Key links and precautions in heating ventilation and air conditioning installation

3.1 Manufacture and installation of air duct

In the heating and ventilation and air-conditioning projects, the production and installation of air ducts is one of the basic projects. The combination of mechanical and manual production is generally used in the production of air ducts in China, with mechanical production as the main. In the early stage of the production of air ducts, technical management personnel shall take design drawings as a basis, fully consider cross-construction projects such as water supply and drainage pipelines, electrical lines, and environmental control lines that may be involved in the installation project, and determine the corresponding coordination plan. In the production of air ducts, flanges, hangers and other production items are carried out at the same time. The air ducts are connected on the ground to a length of 10 to 20 meters. After the air ducts are hoisted to the required height, they are fixed with hangers. Handling and equipped with movable lifts.

3.2 Reasonable layout of pipelines

In the installation of heating ventilation and air conditioning, the layout of various pipes and threading pipes must meet the relevant process requirements, especially when the phenomenon of occupying the same space or crossing each other, etc., the construction site management personnel should combine the design drawings to make specific Analysis: For the unreasonable points in the design drawings, timely communicate with the designer and the constructor, and adjust the design drawings appropriately to ensure the reasonable layout of various pipelines. In general, in heating and ventilation and air-conditioning installation, the length of the air duct should be reasonably controlled to reduce the difficulty of installation.

3.3 Installation of air-conditioning and related equipment

In heating and ventilation and air conditioning projects, the installation of air conditioners and related equipment is the key to affecting the quality of the project. In the installation of air conditioners, the connection parts of the inlet and outlet pipes must be sealed, and the slope of the condensate pipes must meet the drainage requirements of the air conditioners. During the installation of the muffler, it is necessary to ensure the correct installation direction. The circulation direction of the air flow should be marked on the shell of the muffler. The support and hanger must also be set separately. In the installation of the fan, the distance between the fan impeller and the shell must be properly controlled to avoid operation. In the phenomenon of rubbing against each other.

4 conclusions

In the installation of heating ventilation and air conditioning, it is necessary to take into account the various problems that may occur, and take various common installation quality problems to take corresponding technological and technical measures to control. It is also necessary to ensure the safe and stable operation of various equipment and pipelines, thereby improving the overall quality of the project.

Address: No. 3160, Hengzhong Road, Xin'an, Chang'an Town, Dongguan City
Phone: 0769-85350459
Fax: 0769-85350296
Contact: Mr. Tan 13751461639
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lh@jimesale.com Email: lh@jimesale.com


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