What does ventilation engineering include?
Question 1: What are the classifications of ventilation projects? Ventilation projects are a collective term for air supply, exhaust, dust removal, pneumatic transportation, and smoke prevention and exhaust system projects. Including ventilation and oil injection projects, purification projects, wet curtain wall cooling projects, dust-free cleaning projects, oil injection purification projects, pulse dust removal projects, woodworking workshop dust removal projects, cyclone dust removal projects, environmentally friendly air conditioning projects, central air conditioning projects, exhaust gas purification projects, Assembly line engineering, etc.
Question 2: What does ventilation project installation include? surfaceCreated(SurfaceHolderholder): This function will be called immediately after the Surface is created for the first time. The program can do some initialization work related to drawing the interface in this function. Generally, the interface is drawn in another thread, so do not draw the Surface in this function.
surfaceChanged(SurfaceHolderholder,intformat,intwidth,intheight): This function will be called when the state of Surface (size and format) changes. This function will be called at least once after surfaceCreated is called.
surfaceDestroyed(SurfaceHolderholder): This function will be called before the Surface is destroyed. After the function is called, the Surface cannot be used anymore. Generally, the used resources are cleaned up in this function.
Question 3: What parts does the ventilation engineering system consist of? Design and construction instructions, air-conditioning system diagram, air-conditioning water system plan, air-conditioning air system plan, installation sample drawing. Sometimes you need air conditioning host basic drawing or machine room drawing. , air conditioning wiring diagram. In fact, for general small projects, system diagrams, such as wind system and water system plan drawings, are sufficient.
Question 4: What are the effects of ventilation projects? 1. Ventilation and air-conditioning projects consist of ventilation systems and air-conditioning systems.
The ventilation system consists of supply and exhaust fans, air ducts, air duct components, mufflers, etc. The air-conditioning system consists of air-conditioning cold and heat sources, air handlers, air transport pipelines for transportation and distribution, as well as the air-conditioning's automatic control and adjustment of indoor temperature, humidity, air flow speed and cleanliness.
(1) The main function of the ventilation system is to supply and exhaust air, such as smoke prevention and exhaust systems, positive pressure air supply systems, civil air defense ventilation systems, kitchen exhaust fumes, bathroom exhaust, etc., which are connected through air ducts and components , take anti-vibration and noise reduction and other measures to achieve the purpose of dust removal, detoxification and cooling.
(2) The main function of the air conditioning system is to realize air supply and exhaust, refrigeration, heating, humidification, dehumidification, air purification and other projects through air treatment to improve air quality and meet indoor temperature, humidity, air flow speed and cleanliness requirements. The air conditioning cold source uses various chillers; the heat source uses heat pump hot and cold water units, geothermal heat, electric heaters, boiler heating, etc.; fans are used for air supply and exhaust; air conditioning water is controlled by water pumps and water pipe systems; and there is a central air conditioning system and a central Air conditioning terminal equipment is divided into terminal equipment, which consists of fan coil units and other components.
(3) Main contents of ventilation and air conditioning project construction:
1) Production and installation of air ducts, air duct components, mufflers, dust collectors, etc.
2) Anti-corrosion and thermal insulation of air ducts and components, and refrigeration pipes.
3) Installation of air handlers (rooms), fan coils and inducers, ventilators, refrigeration piping, chillers or hot and cold water units.
HVAC engineering includes air conditioning, heating and ventilation systems
, and installation is relatively complex. Generally, the pre-embedding and reservation work for the HVAC installation project begins after the pile foundation project is completed, but most of the workload is carried out in the later stage of the construction project. To carry out the HVAC installation project well, you must carefully read the drawings, make a construction plan in conjunction with the actual project, and conduct full-process management and control in accordance with current specifications, design requirements, etc.
Question 5: What quantities of ventilation and air-conditioning projects are counted? 1. According to the settings of the air handling equipment: Centralized system: The air-conditioning unit directly supplies each room. Semi-centralized system: Water-cooled unit - fresh air unit/fan coil unit Dispersed system: water-cooled unit - fan coil 2. According to the type of medium used to bear the indoor load: all-air system, all-water system, air-water system, refrigerant system 3. According to the source of centralized air conditioning air processing: closed , DC type, hybrid type 4. According to the sub-sections: air conditioning air system, air conditioning water system, purification air conditioning system, refrigeration equipment system, water cooling unit, cooling tower.
(2) Main equipment; air conditioning unit, fresh air unit, fan coil unit.
(3) Ventilation system: 1. Air supply and exhaust system: civil air defense, basement, garage (steel plate, fiberglass reinforced plastic) 2. Smoke prevention and exhaust system (steel plate, fiberglass reinforced plastic, structural air duct) 3. Dust removal system 1 .Outsourced air ducts selected for use in the project must also provide corresponding product certification documents or undergo strength and tightness verification. 2. For the acceptance of ventilation duct specifications, the outer diameter or outer side length of the air duct shall be based on the inner diameter or inner side length of the air duct. The irregular oval air duct shall be based on the rectangular air duct, and the long diameter plane side length and short diameter shall be used. Sizes apply. 3. Galvanized steel plates and various types of steel plates containing composite protective layers should be jointed or riveted, and welding connection methods that affect the anti-corrosion performance of their protective layers must not be used. 4. The sealing of air ducts should be mainly based on the sealing of plate connections. Sealant caulking and other methods can be used for sealing. The performance of the sealant should meet the requirements of the use environment, and the sealing surface should be located on the positive pressure side of the air duct. 5. Air duct material: ordinary steel plate, galvanized steel plate, stainless steel plate, hard polyvinyl chloride, organic glass fiber reinforced plastic, inorganic glass fiber reinforced plastic (the number of corresponding glass cloth layers shall not be less than that specified in the specification, and there shall be no anti-halogenation or severe frost on the surface ) 6. The body, frame, fixing materials, and sealing materials of the fireproof air duct must be non-combustible materials, and their fire resistance level should comply with the design requirements. 7. The covering material of composite air duct must be non-combustible material, internal.
2. Ventilation and air conditioning quotas
(1) Ventilation ducts and components: Power system: supply fan, return fan; air treatment system; air delivery system: muffler, balance valve; air Distribution system: louvers, exhaust vents, air supply vents 1. Ventilation ducts: thin steel plates, fiberglass and composite types 2. Measurement principles: do not deduct elbows, tees, and variable diameters; deduct special valve components: elbow guide vanes, When measuring, the quota for production and assembly will not be deducted; the quota for silencer elbows will be deducted, and the quota for silencer elbows will be applied. 3. The fire damper, muffler, static plenum box and silencer elbow include support and hanger installation. 4. When the silencers are installed continuously, it counts as 2 silencers. 5. The expansion area of the static pressure box is calculated based on 6 sides, without deducting the openings. 6. Concentrically bent rectangular air ducts must be equipped with guide vanes when the maximum side length (horizontal side length) > 500mm. 7. Inspection hole setting position: when the air duct is long, one at the beginning and one at the end; if it is a comfort air conditioner, it may not be set; for a constant temperature and humidity air conditioner, an inspection hole must be set; for a high-efficiency filter, an inspection hole must be set. 8. Measuring holes: Set at the entrances and exits of main pipes and branch pipes. 9. System tightness: Test the area of the air duct as needed, calculated in m2. If the light leakage method fails the air leakage test and passes the air leakage test, 10. Off-site transportation: Calculated in m2, it only refers to the expanded area of thin steel plate air ducts, static pressure boxes, covers and flashing. Production of off-site transportation and installation. On-site production and installation of finished air ducts. Negotiate with the manufacturer whether to apply for off-site transportation. 11. Flexible hoses are calculated in sections regardless of whether they are insulated or not.
(2) Air outlet and valve components 1. If the residual pressure valve is used in the purification system, the steel support and hanger needs to be calculated separately. 2. For electric valves with an electric actuator on the valve body itself, the corresponding subheadings for the installation of electric actuators shall not be applied to their installation. 3. When the smoke exhaust air outlet and positive pressure air supply outlet are equipped with actuators, the smoke exhaust air outlet installation sub-item on page 55 shall apply. The installation of smoke exhaust vents with remote control should follow the installation of smoke exhaust vents on page 55 and the installation of control devices on page 58, and the main materials are supplemented. When the electric motor and valve components are integrated, only one valve component can be installed to supplement the main material. (For example, the electric multi-leaf control valve can only be installed with one multi-leaf control valve, and the main material is supplemented. 4. The hood is flooded and flooded: the calculation area is divided into three sections: two straight pipe ends, and a trapezoidal DH2H3a exhaust hood hbH1D1 ventilator A belt protective cover should be used for the exposed parts, and a motor rain cover should be used for the outdoor part of the ventilator.
Expanded area formula: Circle: F=1/2 (D1+D)*П*H3+D*П*H2+D1*П*H1 Rectangle: F=［2（A+B）+2（A1+B1 )]*H3/2+2 (A+B)*H2+2 (A1+B1)*H1, where H=D or the largest side length of the air duct, H1=10...>>
Question 6: What are the functions of ventilation engineering? Some equipment that helps ventilation and cooling in workshops can solve the stuffy feeling in workshops! I have a few friends who have good ventilation projects in Mingqing and the National Exhibition Center.
Question 7: What are the commonly used non-metallic materials in ventilation projects? According to their specifications, only flame retardant and non-retardant materials are available. There are two requirements for combustion, and the use of asbestos-containing gaskets in ventilation systems is not allowed. Therefore, the ventilation system has always used rubber gaskets, and the smoke exhaust system has used asbestos products and developed rubber asbestos products. With the continuous emergence of new materials, many gasket materials that appear to be easier to operate have appeared on the construction site, such as 8501 sealing strips with glue on one side.
However, first of all, there seems to be no accurate and strict control (such as fire-resistant type inspection, fire certification, etc.) on whether the fire resistance of these new materials meets the requirements of relevant specifications, and to ensure sealing In terms of the elasticity and aging resistance of the effect, it seems that the effect is not as reliable as that of traditional rubber products. This is the status quo, who cares?
Question 8: What does the ventilation system engineering drawing include? 5 points System diagram, schematic diagram, floor plan, large sample diagram, section diagram, etc.
Question 9: What equipment installation does the ventilation and air conditioning project include? 1. Single machine test operation record of water supply system equipment, hot water system equipment, mechanical drainage system equipment, fire protection system equipment, heating system equipment, water treatment system Equipment, as well as various water pumps, fans, chillers, cooling towers, air conditioning units, fresh air units and other equipment in the ventilation and air conditioning system, after installation, a stand-alone test run should be carried out
Question 10: Fire protection and ventilation What categories does the engineering technical bid include? The technical bid includes project introduction, project scale, project management organization structure and management system, construction progress, quality, material procurement and other guarantee system structure, construction plan, finished product protection and environmental protection, fire protection measures and safety measures and Architecture etc.