E-mail:Machine@chinaventech.com Expert for pre insulated duct CNC cutting machine.
High Quality Air Conditioning Ductwork Supplies From VENTECH
YINGDE VENTECH INTELLIGENT EQUIPMENT CO., LTD. manufactures air conditioning ductwork supplies with fantastic features. Firstly, it is made of highly reliable and first-rate raw materials which ensure the quality of the product from the source. Secondly, produced by the smooth production process and state-of-the-art technology, the product is characterized by the long service life and easy maintenance. What's more, it has reached European & American standard and has passed the authentication of international quality system.
As we continue to establish new customers for VENTECH in the global market, we stay focused on meeting their needs. We know that losing customers is much easier than getting customers. So we conduct customer surveys to find out what they like and dislike about our products. Talk to them personally and ask them what they think. In this way, we have established a solid customer base globally.
The product enhances airflow efficiency in HVAC systems for consistent temperature regulation. Engineered for easy integration with various air conditioning units, it supports optimal air distribution and minimizes energy loss. Precisely manufactured to meet standard installation requirements, it is ideal for both residential and commercial ventilation projects.
Air conditioning ductwork supplies are essential for efficient air distribution in HVAC systems, ensuring consistent temperatures and improved indoor air quality. Durable materials like galvanized steel or aluminum extend lifespan while reducing energy costs.
Ideal for residential, commercial, and industrial buildings requiring climate control. Suitable for both new installations and retrofitting older systems to enhance airflow efficiency and comfort.
Choose based on material durability, insulation type (e.g., fiberglass or foam), and compatibility with existing HVAC dimensions. Prioritize sealed joints to minimize leaks and optimize system performance.
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The Tricky Parts of AC Installation TechniqueThe systematic AC Installation contains AC units, water pipes, air ducts and insulation, and all the networks that are used as bridges in the process. In the process, you may come across to some problems:
(A) Pipelines, equipment positioning and elevation crossover For comprehensive buildings, there are air conditioningend equipment, supply and return air ducts, exhaust air ducts, chilled water pipes, condensate pipes, sprinkler pipes, fire protection pipes, electrical bridges and other professional pipelines in the ceiling space. In the case of insufficient labeling in the drawings according to the diagram for construction, usually the first installation of the ducts construction is very convenient, yet later on the installation is very difficult. The ducts would only be installed in the location or elevation not suitable for installation, seriously affecting the quality and progress of the project. In response to the above problems, it is necessary to comply with the principles of integrated design of duct engineering.
(B) Equipment noise exceeds the standard Equipment noise mainly comes from the collision of the end of the air conditioning equipment. Noise generated mainly from the design, installation, especially the noise generated by the installation should not be ignored. HVAC in addition to their own professions also involve architecture, acoustics, structure and other professions, and noise control requires the coordination of each profession with each other. (C) Air conditioningwater system water circulationWater system is the most critical link in central air conditioning construction, from which the problems generate will directly affect the normal operation of the system. The most common problem in central air conditioning chilled water system is poor circulation of chilled water system piping. The reasons for poor pipeline circulation are: 1. The pipeline lines of various professions are crossed and not coordinated well during construction, resulting in many air bubbles in the pipeline network, which affects the circulation of the pipeline network.2. Air conditioning water system pipeline cleaning is not thorough, directly causing the air conditioning water system blockage. (D) Water condensationAir conditioning system may have the phenomenon of condensation and water dripping in the commissioning and operation, and the cause of this problem may be the small slope of the condensate drainage pipe, or no slope at all; or due to uneven installation of the water collection plate of the fan coil; or the drainage outlet in the plate is blocked causing the water overflows; due to the poor quality of insulation of refrigerated water pipes and valves, the insulation layer is not tightened to the wall of refrigerated water pipes, resulting in the dripping of air condensate on the outer wall of the pipes; there are also drips of secondary condensate on the lower surface of the water collection tray. Therefore, poor duct installation and insulation, loose connection between ducts and fittings, ducts and equipment, and incautious operating procedures for duct installation may all cause this problem. The quality of the ducts and essential materials directly affect the quality of the installation, so it is necessary to carry out a systematic and careful inspection before duct installation. ----by Carol Liu
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(A) Pipelines, equipment positioning and elevation crossover For comprehensive buildings, there are air conditioningend equipment, supply and return air ducts, exhaust air ducts, chilled water pipes, condensate pipes, sprinkler pipes, fire protection pipes, electrical bridges and other professional pipelines in the ceiling space. In the case of insufficient labeling in the drawings according to the diagram for construction, usually the first installation of the ducts construction is very convenient, yet later on the installation is very difficult. The ducts would only be installed in the location or elevation not suitable for installation, seriously affecting the quality and progress of the project. In response to the above problems, it is necessary to comply with the principles of integrated design of duct engineering.
(B) Equipment noise exceeds the standard Equipment noise mainly comes from the collision of the end of the air conditioning equipment. Noise generated mainly from the design, installation, especially the noise generated by the installation should not be ignored. HVAC in addition to their own professions also involve architecture, acoustics, structure and other professions, and noise control requires the coordination of each profession with each other. (C) Air conditioningwater system water circulationWater system is the most critical link in central air conditioning construction, from which the problems generate will directly affect the normal operation of the system. The most common problem in central air conditioning chilled water system is poor circulation of chilled water system piping. The reasons for poor pipeline circulation are: 1. The pipeline lines of various professions are crossed and not coordinated well during construction, resulting in many air bubbles in the pipeline network, which affects the circulation of the pipeline network.2. Air conditioning water system pipeline cleaning is not thorough, directly causing the air conditioning water system blockage. (D) Water condensationAir conditioning system may have the phenomenon of condensation and water dripping in the commissioning and operation, and the cause of this problem may be the small slope of the condensate drainage pipe, or no slope at all; or due to uneven installation of the water collection plate of the fan coil; or the drainage outlet in the plate is blocked causing the water overflows; due to the poor quality of insulation of refrigerated water pipes and valves, the insulation layer is not tightened to the wall of refrigerated water pipes, resulting in the dripping of air condensate on the outer wall of the pipes; there are also drips of secondary condensate on the lower surface of the water collection tray. Therefore, poor duct installation and insulation, loose connection between ducts and fittings, ducts and equipment, and incautious operating procedures for duct installation may all cause this problem. The quality of the ducts and essential materials directly affect the quality of the installation, so it is necessary to carry out a systematic and careful inspection before duct installation. ----by Carol Liu
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Application of air-conditioning duct and thermal insulation material
In the ventilation project, the air duct should be made of suitable material according to the project requirements. Design and construction personnel need to fully understand the air ducts of different material properties and their use, application occasions, and under what circumstances the air ducts need to be insulated, so as to build a reasonable and durable ventilation pipe network system.
The materials used in ventilation ducts are commonly used in the following categories:
A: Sheet metal, sheet metal is the main material for making air ducts and components.
(1) Ordinary thin steel plate has good processing performance and structural strength, and is often used in general ventilation ducts and dust removal ducts. The surface is easy to rust and should be painted for anti-corrosion.
(2) Galvanized steel sheet is made of ordinary thin steel sheet galvanized, and its surface is protected by a zinc layer to prevent rust. Because of its silver-white surface, it is also called "white iron sheet". White iron sheet is generally thin in thickness, and is often used in air-conditioning systems without dust and wear in the gas and in humid environments that are not affected by acid mist.
(3) Aluminum and aluminum alloy plates have good processing performance, corrosion resistance, and are not easy to generate sparks during friction, but the cost is high, and they are often used in ventilation systems that require explosion-proof.
(4) Stainless steel plate has good corrosion resistance, and its cost is high, but it is only required for high corrosion resistance, such as ventilation pipes of chemical systems.
B: Non-metallic materials. There are many types of non-metallic materials used in ventilation pipes, but their applications are not as common as metal sheets.
(1) Hard polyvinyl chloride, strong acid, alkali and corrosion resistance, good machinability, smooth surface and convenient construction. Often used in ventilation systems with corrosive gases. However, rigid PVC is not resistant to high temperature, the operating temperature is generally not more than 60 degrees, and the linear expansion coefficient is large, so it is not easy to age and fire.
(2) FRP, which is a composite material made of glass fiber products as reinforcing materials and resins as binders through a certain molding process. Good corrosion resistance, commonly used in exhaust systems containing corrosive gases and water vapor
(3) Plastic composite steel plate, which is to spray a layer of 0.2-0.4mm thick plastic layer on the surface of ordinary thin steel plate. This kind of steel plate is more expensive, 50% more expensive than ordinary carbon steel plate.
(4) Bricks and concrete, which are the most common building materials, are often used to utilize building space or lay underground air ducts.
Usually, the ducts of the above materials are used in the following applications:
1) Thin steel plate: general ventilation and air conditioning system: 0.5~1.5mm; dust removal system: 1.5~3.0mm.
2) Plastic plate: Ventilation system containing corrosive gas.
3) Inorganic FRP: occasions with high humidity.
4) All kinds of hoses: metal, plastic, and some with insulation layer.
5) Composite air duct: double-layer aluminum foil plus phenolic resin, single-layer aluminum foil plus glass fiber, commonly used in air-conditioning systems with high dust-proof requirements and corrosion-resistant systems at -10℃~70℃.
6) New flexible air duct: uniform and superior air distribution, avoiding the feeling of blowing; light weight, convenient and fast installation, low structural requirements; good flexibility, easy to change the system; easy to clean.
In the following cases, our construction personnel should insulate the air duct:
(1) Due to the excessive cold and heat loss, the lack of heat preservation is economically unreasonable;
(2) Due to the loss of cold and heat, the temperature of the medium cannot reach the temperature required by the design;
(3) Due to heat loss, the temperature of the gas transported in the air duct is reduced to the point where it is possible to condense or freeze in the air duct or in the subsequent dry dust collector;
(4) Condensation occurs on the outer surface of the air duct due to the loss of cooling capacity;
(5) Due to the transport of high-temperature gas, the temperature of the outer surface of the air duct is too high (for example, greater than 50 °C), which may cause burns to operators and maintenance personnel, or cause gas, steam, and dust explosions and fires.
The specific requirements for insulation materials are:
(1) The thermal conductivity is small, generally not exceeding 0.23W/m•K;
(2) The material has high porosity and low density, and the density generally does not exceed 600kg/m3;
(3) It has a certain compressive strength and is not easy to deform;
(4) Low hygroscopicity and no corrosive effect on the pipe wall;
(5) It is not suitable to use organic substances and flammable substances, otherwise anti-corrosion and fire-proof treatment should be carried out.
(6) When used in high temperature pipelines, it should be resistant to high temperature and have stable performance at high temperatures;
(7) It is easy to construct and install, and the cost is low.
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In the ventilation project, the air duct should be made of suitable material according to the project requirements. Design and construction personnel need to fully understand the air ducts of different material properties and their use, application occasions, and under what circumstances the air ducts need to be insulated, so as to build a reasonable and durable ventilation pipe network system.
The materials used in ventilation ducts are commonly used in the following categories:
A: Sheet metal, sheet metal is the main material for making air ducts and components.
(1) Ordinary thin steel plate has good processing performance and structural strength, and is often used in general ventilation ducts and dust removal ducts. The surface is easy to rust and should be painted for anti-corrosion.
(2) Galvanized steel sheet is made of ordinary thin steel sheet galvanized, and its surface is protected by a zinc layer to prevent rust. Because of its silver-white surface, it is also called "white iron sheet". White iron sheet is generally thin in thickness, and is often used in air-conditioning systems without dust and wear in the gas and in humid environments that are not affected by acid mist.
(3) Aluminum and aluminum alloy plates have good processing performance, corrosion resistance, and are not easy to generate sparks during friction, but the cost is high, and they are often used in ventilation systems that require explosion-proof.
(4) Stainless steel plate has good corrosion resistance, and its cost is high, but it is only required for high corrosion resistance, such as ventilation pipes of chemical systems.
B: Non-metallic materials. There are many types of non-metallic materials used in ventilation pipes, but their applications are not as common as metal sheets.
(1) Hard polyvinyl chloride, strong acid, alkali and corrosion resistance, good machinability, smooth surface and convenient construction. Often used in ventilation systems with corrosive gases. However, rigid PVC is not resistant to high temperature, the operating temperature is generally not more than 60 degrees, and the linear expansion coefficient is large, so it is not easy to age and fire.
(2) FRP, which is a composite material made of glass fiber products as reinforcing materials and resins as binders through a certain molding process. Good corrosion resistance, commonly used in exhaust systems containing corrosive gases and water vapor
(3) Plastic composite steel plate, which is to spray a layer of 0.2-0.4mm thick plastic layer on the surface of ordinary thin steel plate. This kind of steel plate is more expensive, 50% more expensive than ordinary carbon steel plate.
(4) Bricks and concrete, which are the most common building materials, are often used to utilize building space or lay underground air ducts.
Usually, the ducts of the above materials are used in the following applications:
1) Thin steel plate: general ventilation and air conditioning system: 0.5~1.5mm; dust removal system: 1.5~3.0mm.
2) Plastic plate: Ventilation system containing corrosive gas.
3) Inorganic FRP: occasions with high humidity.
4) All kinds of hoses: metal, plastic, and some with insulation layer.
5) Composite air duct: double-layer aluminum foil plus phenolic resin, single-layer aluminum foil plus glass fiber, commonly used in air-conditioning systems with high dust-proof requirements and corrosion-resistant systems at -10℃~70℃.
6) New flexible air duct: uniform and superior air distribution, avoiding the feeling of blowing; light weight, convenient and fast installation, low structural requirements; good flexibility, easy to change the system; easy to clean.
In the following cases, our construction personnel should insulate the air duct:
(1) Due to the excessive cold and heat loss, the lack of heat preservation is economically unreasonable;
(2) Due to the loss of cold and heat, the temperature of the medium cannot reach the temperature required by the design;
(3) Due to heat loss, the temperature of the gas transported in the air duct is reduced to the point where it is possible to condense or freeze in the air duct or in the subsequent dry dust collector;
(4) Condensation occurs on the outer surface of the air duct due to the loss of cooling capacity;
(5) Due to the transport of high-temperature gas, the temperature of the outer surface of the air duct is too high (for example, greater than 50 °C), which may cause burns to operators and maintenance personnel, or cause gas, steam, and dust explosions and fires.
The specific requirements for insulation materials are:
(1) The thermal conductivity is small, generally not exceeding 0.23W/m•K;
(2) The material has high porosity and low density, and the density generally does not exceed 600kg/m3;
(3) It has a certain compressive strength and is not easy to deform;
(4) Low hygroscopicity and no corrosive effect on the pipe wall;
(5) It is not suitable to use organic substances and flammable substances, otherwise anti-corrosion and fire-proof treatment should be carried out.
(6) When used in high temperature pipelines, it should be resistant to high temperature and have stable performance at high temperatures;
(7) It is easy to construct and install, and the cost is low.
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Air conditioning system components-part2
1. Temperature Controller
The temperature controller is used for the control or protection of the unit. When the temperature reaches the set value, the switch automatically cuts off (or turns on) the circuit. In our products, the temperature control is often used, and the temperature of the water tank is used to control the start and stop of the unit.
There are also some like antifreeze that require the use of a temperature controller.
2. liquid sight glass
The sight glass is used to indicate: 1. The condition of the refrigerant in the liquid pipeline in the refrigeration unit; 2. The water content in the refrigerant; 3. The flow of the lubricating oil from the oil separator in the oil return pipeline. Some sight glasses have an indicator that changes its color to indicate the water content in the refrigerant.
3. Expansion tank
1)The volume of water changes due to temperature changes, and the expansion tank is used to store this part of the expansion water;
2)It plays the role of voltage regulation and constant pressure on the system;
3)Part of the water can be compensated for the system.
4. Cooling Tower
The function of the cooling tower is to exchange heat with the air in the cooling water carrying the heat in the tower, so that the heat is transferred to the air and dissipated into the atmosphere.
One of the heat exchange methods between water and air in the cooling tower is that the air flowing over the water surface is in direct contact with the water, and the heat in the water is transferred to the air through contact heat transfer and evaporative heat dissipation.
Cooling in this way is called a wet cooling tower. The heat exchange efficiency of the wet cooling tower is high, and the limit temperature of the water being cooled is the wet bulb temperature of the air. However, water loss is caused by evaporation; evaporation increases the salinity of the circulating cooling water.
In order to stabilize the water quality, part of the water with higher salinity must be drained; wind blowing will also cause water drift loss. Sufficient fresh water must be continuously replenished.
Therefore, the wet cooling tower needs a water source for supplying water. In water-deficient areas, dry cooling towers can only be used when it is difficult to replenish water. The heat exchange between air and water in the dry cooling tower is to transfer heat through the surface of the radiator composed of metal tubes, and transfer the heat of the water in the tube to the air flowing outside the radiator.
The heat exchange efficiency of the dry cooling tower is lower than that of the wet cooling tower, and the limit temperature of cooling is the dry bulb temperature of the air. The one-time investment of these devices is large, and the fan energy consumption is high.
The process of cooling water in a cooling tower is a heat and mass transfer process. The cooled water is distributed to the inner packing of the cooling tower by a nozzle, a water distributor or a water distribution plate, which greatly increases the contact area between the water and the air. Air is circulated by the induced effect of fans, forced air, natural wind or jets.
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1. Temperature Controller
The temperature controller is used for the control or protection of the unit. When the temperature reaches the set value, the switch automatically cuts off (or turns on) the circuit. In our products, the temperature control is often used, and the temperature of the water tank is used to control the start and stop of the unit.
There are also some like antifreeze that require the use of a temperature controller.
2. liquid sight glass
The sight glass is used to indicate: 1. The condition of the refrigerant in the liquid pipeline in the refrigeration unit; 2. The water content in the refrigerant; 3. The flow of the lubricating oil from the oil separator in the oil return pipeline. Some sight glasses have an indicator that changes its color to indicate the water content in the refrigerant.
3. Expansion tank
1)The volume of water changes due to temperature changes, and the expansion tank is used to store this part of the expansion water;
2)It plays the role of voltage regulation and constant pressure on the system;
3)Part of the water can be compensated for the system.
4. Cooling Tower
The function of the cooling tower is to exchange heat with the air in the cooling water carrying the heat in the tower, so that the heat is transferred to the air and dissipated into the atmosphere.
One of the heat exchange methods between water and air in the cooling tower is that the air flowing over the water surface is in direct contact with the water, and the heat in the water is transferred to the air through contact heat transfer and evaporative heat dissipation.
Cooling in this way is called a wet cooling tower. The heat exchange efficiency of the wet cooling tower is high, and the limit temperature of the water being cooled is the wet bulb temperature of the air. However, water loss is caused by evaporation; evaporation increases the salinity of the circulating cooling water.
In order to stabilize the water quality, part of the water with higher salinity must be drained; wind blowing will also cause water drift loss. Sufficient fresh water must be continuously replenished.
Therefore, the wet cooling tower needs a water source for supplying water. In water-deficient areas, dry cooling towers can only be used when it is difficult to replenish water. The heat exchange between air and water in the dry cooling tower is to transfer heat through the surface of the radiator composed of metal tubes, and transfer the heat of the water in the tube to the air flowing outside the radiator.
The heat exchange efficiency of the dry cooling tower is lower than that of the wet cooling tower, and the limit temperature of cooling is the dry bulb temperature of the air. The one-time investment of these devices is large, and the fan energy consumption is high.
The process of cooling water in a cooling tower is a heat and mass transfer process. The cooled water is distributed to the inner packing of the cooling tower by a nozzle, a water distributor or a water distribution plate, which greatly increases the contact area between the water and the air. Air is circulated by the induced effect of fans, forced air, natural wind or jets.
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Address : No.3, Hongcha Road, Yinghong Industrial Zone, Yingde, Qingyuan, Guangdong, China.
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