Three-dimensional Visualization Scheme For The Three Major Sub-processes Of HVAC Engineering

Three-dimensional visualization scheme for the three major sub-processes of HVAC engineering

Galvanized steel air duct processing process

First, when making ventilation ducts, you must first select the material thickness and select galvanized steel plates according to the list. Second, after shearing and pressing the bead, you need to wipe the surface with alcohol. Many people will ignore this step. However, if cleaning is not done, it will affect the subsequent sealing effect. Third, when folding, the center of the blade and the lower mold must be aligned, and the folding angle must be accurate.

Use hydraulic rivet pliers or manual eye clamps to connect the angle steel flanges, and use 5 x 10 rivets to firmly fix the air duct. The flange must be flat, and its size must not be less than 6 mm. The four corners must be flattened, and there must be no gaps. Most air leakage problems occur in these subtle places, and they are easily detected during acceptance.

Common plate flange and sealing treatment

For common plate flange air ducts, the flange needs to be cut according to the length first. Then insert it into the end of the air duct wall, and then use riveting to connect it into one. For semi-finished air ducts and accessories, the sewing operation must be performed first. Then install the flange corners and check the diagonal error after leveling the flange surface. Finally, apply silicone to the four corners for sealing.

The installed air duct needs to be tested for tightness in a dark environment, using a 24-volt bulb with a power of more than 100 watts and a protective cover to move it against the air duct. At the same time, arrange for personnel to observe on the other side of the air duct. Once light is found to be emitted, it indicates that there is a leak. At this time, relevant records must be made and repairs must be made immediately. This method is simple and effective, and is used to find leaks at construction sites.

Support and hanger production and insulation construction

For air ducts placed in the horizontal direction, the vertical rods used to support the hangers are threaded screws, and the cross arms are made of angle steel. As for the specific model used, it must be determined according to the size of the air duct. For vertical air ducts, angle steel is used as a bracket to achieve fixation. The spacing and strength between these supports and hangers must meet the requirements of the regulations. Otherwise, when the air duct is running, it will shake and generate noise.

Only after the air duct tightness test has passed, and the concealment acceptance must also pass, can the air duct insulation begin a series of related operations. First, be sure to wipe the actual surface of the air duct clean, then immediately attach objects such as insulation nails, and then lay the insulation material very carefully. There must not be any gaps left in the insulation layer, and the joints must be carefully sealed with tape, otherwise condensation will easily occur, which will affect the actual effect of the air conditioner.

Plate heat exchanger installation points

When installing a plate heat exchanger, it should be noted that the corresponding position of the center of the equipment does not necessarily coincide with the center of the foundation. When moving, be careful to prevent the equipment from overturning. Sufficient maintenance space must be reserved around it. When the equipment fails, sufficient operating distance must be available before it can be removed and repaired.

The supports and hangers of the inlet and outlet pipelines need to be installed reasonably. The three-dimensional visualization scheme of the three major sub-processes of HVAC engineering. The weight of the pipeline must not be borne and exerted by the equipment flange. The weight of the pipeline and the equipment flange are separated from each other. Each of them has its own independent support system. If the weight of the pipeline relies on the flange, leakage will occur after a period of operation, and repairs in this situation will be extremely complicated and troublesome.

Air conditioning unit and centrifugal fan installation

The hoisting of the air conditioning unit needs to be carried out one by one in sequence from the inside out. The equipment itself cannot bear the weight of the external pipes. All incoming and outgoing air ducts must be equipped with supports and fixings to ensure that the stress on the ducts is not transmitted to the equipment. For installation on the ground, a concrete foundation and rubber shock-absorbing pads must be provided, and the anchor bolts must be stable and have measures to prevent loosening.

Floor-mounted centrifugal fans require a concrete foundation, but the shock absorbers must be replaced with spring shock absorbers. When connecting the air duct and the fan, do not force the connection, and the weight of other parts of the machine casing should not be exerted. When the fan is running, there will be a large vibration amplitude . The central air conditioning ventilation duct (white iron/galvanized sheet) is riveted and welded . If the connection is not tight, it will cause great noise and may also cause damage to the equipment.

Installation specifications for air vents and smoke exhaust vents

The length difference between the two diagonals should not exceed 3 mm. This is the basic requirement to ensure that the appearance of the rectangular air outlet is smooth. The connection between the air outlet and the air duct must be tight and firm. The frame must be close to the decorative surface. The central air conditioning ventilation duct (white iron/galvanized sheet) must be riveted and welded . The outer surface must not be deformed. The air outlet blades must be flexible and smooth when adjusting.

When the smoke exhaust outlet is installed on the suspended ceiling, the bottom elevation of the smoke exhaust pipe must be greater than 250 mm from the ceiling surface. This distance is used to facilitate installation and operation. The control cable should be protected with a DN20 casing. Its bending radius should not be less than 250 mm. The number of bends should usually not exceed 3 central air conditioning ventilation ducts (white iron/galvanized sheet) riveting and welding . If there are too many, it will affect the operational sensitivity.

During construction, what is the most frequent air leakage situation in air ducts that everyone encounters? You are sincerely welcome to share your experience and solutions in the comment area?