Abstract: HVAC construction includes heating, ventilation and air conditioning. Heating is the use of radiators and other heat to provide indoor temperature higher than outdoor; ventilation is the exchange of indoor and outdoor air to keep indoor air clean; and air conditioning is to adjust the temperature, humidity, cleanliness and so on.
Key words: HVAC construction air conditioning
In recent years, with the progress of science and technology in China and the improvement of people's living standards, the demand for HVAC equipment has become more and more vigorous. Good HVAC construction is conducive to the further development of the HVAC market. Based on the clean room of electronic workshop, this paper analyses the HVAC construction.
1. Overview of HVAC Construction Technology
1.1 In terms of technical organization
(1) Carefully inspect the drawings to ensure that the intersections of dense and intersecting places, such as pipelines and air ducts, will not fail in the construction process due to space problems.
(2) We must do a good job in the acceptance of the project.
(3) During construction, attention must be paid to key parts to prevent loosening, staggered joints, leakage and other problems.
(4) During the construction process, special attention must be paid to the protection of HVAC products and products, so as not to damage HVAC equipment because of the noisy construction personnel.
(5) Before preparing for commissioning, we must check it again to ensure its quality.
1.2 Main construction methods.
In the process of HVAC construction, because it may be carried out at the same time with other types of work, it is necessary to contact more with other types of work, maintain coordinated operation, and flexibly arrange the construction sequence according to the actual situation.
2. Construction of air conditioning water system
(1) First of all, support and hanger should be made uniformly according to certain requirements, and rust removal and anticorrosion treatment should be carried out.
(2) Pipeline connection
A. Welding connection:
The distance from the center of the weld to the bending starting point of the pipe is larger than the outside diameter of the pipe, generally greater than 100 mm.
(2) Before welding, all kinds of pollutants such as paint and dirt should be cleaned up.
(3) When welding, the inner wall of the pipe should be kept horizontally aligned, and the wrong side should not exceed 1 mm.
B. Screw connection:
Before installing the welded pipe, the bore of the pipe should be cleaned, the lead oil should be applied to the thread connection pipe, the hemp should be wrapped, and then tightened.
(2) In addition to linen, temporary wire plugging should be added to all orifices.
(3) Pipeline test
1) Hydraulic test
A. Before the formal test, the pressure water equipment should be used to flush the pipes. At this time, the pressure should be less than 1 mPa, and stolen goods should be avoided when flushing the pipes.
B. Connect the pressure test pump at the entrance of the first floor or outdoor pipeline.
C. Close the inlet which is reserved as the spare port in advance, then close the low windproof valve and drain valve, and finally open the highest valve, so that the water pressure can be tested.
D. Open the water source valve, fill it with water, put the clean cold air into it when the water is full, and then close the valve E. Make a comprehensive inspection of the system.
2) Pipeline system flushing
After completion of pipeline pressure test and qualified inspection, the orifice plate, filter and other devices should be removed, and then rinsed. The rinsing water pressure is generally 0.3Mpa.
3 Purification Air Conditioning System
3.1 airway
(1) Air duct design
A. In duct design, it is better not to have transverse splicing seams at the bottom of the pipe, nor longitudinal splicing seams when the width of the bottom of the pipe does not exceed 900 mm.
B. When splicing each plate, the joint bite is usually used. This method is reliable and firm.
C. The inside of the duct must be smooth and free of any debris.
D. Air ducts must be painted in accordance with the regulations, and surface dirt must be removed before painting.
E. Galvanized steel sheets should be brushed twice to prevent damage.
F. Screws and other components should be galvanized, not hollow rivets.
G. Air ducts, etc. must be kept clean. After completion, all parts should be cleaned and a certain degree of dryness should be achieved.
H. If the diameter of the air-conditioning system exceeds 500 mm, after installation, the hole must be closed immediately after cleaning and other work.
I. Air ducts and their components should not be stacked at will, nor made in a room without windows and doors.
J. Pipelines must be repaired, leveled and cleaned around the openings where they pass through walls and ceiling.
(2) Air duct installation
A gasket can be made of flame retardant plywood, usually 5 mm.
B. Seal gaskets should minimize the number of joints, wipe them clean before use, and minimize joints.
C. The tightening moment should be kept the same, and the phenomenon of uneven tightening should not occur.
E. Valve components must be removed from the oil before installation.
F wipe clean the air conditioning system with the above fiber is not easy to fall off items.
(3) Air duct reinforcement measures
In order to prevent the distortion and deformation of air duct caused by trampling, it is necessary to reinforce the air duct by using angle iron reinforcement frame in strict accordance with the code.
3.2 Installation of High Efficiency Filter
(1) Working conditions
A. Be sure to check and clean high-efficiency filters before they are used.
B. Before installing high-efficiency filters, the purification system must be commissioned, and the commissioning time should generally be maintained for more than twelve consecutive hours.
Installation process:
A. The frame should be flat and the deviation should not exceed one millimeter.
B. The filter and the frame should be sealed with a gasket to ensure that it is completely sealed before installation. Also clean the surface of packing and frame.
C. The arrow on the outer frame should be in accordance with the flow direction of the airflow, and must not be refilled.
D. Before installation, it is necessary to inspect the appearance and test the leak according to the specifications.
Protection of finished products
The transportation and storage of high efficiency filters should be placed in accordance with the regulations, and they must be handled and handled lightly in the transportation process.

3.3 Quality Assurance Measures for Clean Room

(1) Air control quality assurance measures
It should be operated in strict accordance with the rules and regulations. To ensure the high quality of air control work, special personnel should be responsible for supervision, guidance and inspection. Cleaning process should also be carried out in strict accordance with operational requirements.
(2) Quality assurance measures for air duct transportation
In the course of transportation, we should handle it lightly and lightly, and we can also set up a special person to supervise it. If the air duct is damaged during transportation, it should be re-cleaned and re-sealed.
(3) Sealing of professional equipment
After each construction, all seals should be checked, and if they are not qualified, they should be rectified immediately.
(4) Coordination with decorative work
Shandong Aide Purification Engineering Co., Ltd. devotes itself to the fields of medical purification engineering, laboratory system engineering, clean workshop system and so on. After years of development, it has accumulated rich industry experience and gained "China's 3.15 Consumer Trusted Products", "Excellent Engineers in HVAC Purification Industry in 2017" and "Enterprises in 2017". The prize of listing and listing in the stock market reform is a powerful enterprise in the clean Engineering industry. To learn more about the medical purification industry, please pay attention to the Wechat Public Number: Aide-188