Question two: ventilation project installation includes those contents? surfaceCreated(SurfaceHolderholder): This function is 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, usually in another thread to draw the interface, so do not draw Surface in this function.
surfaceChanged(SurfaceHolderholder,intformat,intwidth, intheight): This function is called when the state (size and format) of the Surface changes, and will be called at least once after the surfaceCreated call.
surfaceDestroyed(SurfaceHolderholder): this function is called when the Surface is destroyed before the function is called, the function can not continue to use the Surface after it is called, generally in this function to clean up the resources used.
Question 3: ventilation engineering system consists of what parts of the design and construction instructions, air conditioning system diagrams, air conditioning water system plan, air conditioning wind system plan, installation of sample drawings, sometimes need air conditioning mainframe foundation diagram or room diagram, air conditioning wiring diagram. The actual general small project has a system diagram, wind system, water system plan on the line.
Question 4: What are the effects of ventilation projects A ventilation and air conditioning project consists of ventilation systems and air conditioning systems.
The ventilation system consists of supply and exhaust fans, ducts, duct components, mufflers and so on. The air conditioning system consists of air conditioning cold and hot sources, air handlers, air delivery piping delivery and distribution, as well as air conditioning on the indoor temperature, humidity, airflow rate and cleanliness of the automatic control and regulation of the composition.
(1) The main function of the ventilation system is to send exhaust, such as smoke exhaust system, positive pressure air supply system, air defense ventilation system, kitchen exhaust fumes, bathroom exhaust, etc., through the air ducts and components are connected to take measures such as vibration prevention and muffling to achieve the purpose of dust removal, detoxification, cooling.
(2) The main function of the air-conditioning system is to realize air supply and exhaust, cooling, heating, humidification, dehumidification, air purification and other projects through air treatment to improve the air quality and meet the indoor requirements for temperature, humidity, airflow rate and cleanliness. Air conditioning cold source using various types of chiller units; heat source using heat pump-type chiller units, geothermal, electric heaters, boiler heating, etc.; air supply and exhaust air using fans; air conditioning water using water pumps and plumbing system control; and there is a centralized air-conditioning system and centralized air-conditioning end equipment to distinguish between the end of the device by the fan coiler and other components and so on.
(3) ventilation and air conditioning engineering construction:
1) air ducts, duct components, mufflers, dust collectors and other production and installation.
2) air ducts and components, refrigeration piping anticorrosion insulation.
3) Air handler (room), fan coil and inducer, ventilator, refrigeration piping, chiller or chilled and hot water units and other installation.
The HVAC project includes air conditioning, heating and ventilation systems
, the installation is more complex. Generally after the end of the pile foundation project began HVAC installation project buried and reserved work, but the vast majority of the workload is carried out in the later stages of the construction project. To do a good job in the construction of HVAC installation project, we must carefully review the drawings, contact with the actual project to do a good job of construction plans, and according to the current specifications, design requirements, etc. for the whole process of management and control.
Question 5: ventilation and air-conditioning works count what works 1. According to the air handling equipment set up: centralized system: air conditioning unit directly supply each room half centralized system: water-cooled unit - fresh air unit / fan coil full decentralized system: water-cooled unit - fan coil 2. According to the burden of the indoor load of the media used by the type of points According to the centralized air conditioning treatment air source: closed, DC, mixed 4. According to the sub-parts: air conditioning wind system, air conditioning water system, purified air conditioning system, refrigeration equipment systems, water-cooled units, cooling towers.
(ii) the main equipment; air conditioning unit, fresh air unit, fan coiler.
(C) ventilation system: 1. air supply and exhaust system: human defense, basement, garage (steel plate, glass fiber reinforced plastic) 2. smoke evacuation system (steel plate, glass fiber reinforced plastic, structural duct) 3. dust removal system 1. purchased ducts selected in the project, but also must provide the appropriate product qualification documents or strength and tightness verification. 2. acceptance of the specifications of the ventilation ducts, ducts, outside the outer diameter or outside the edge of the long The acceptance of the specifications of the ventilation duct, the air duct to the inner diameter or length of the inner side shall prevail, irregular oval duct reference rectangular duct, and the long diameter plane side length and short diameter size shall prevail. 3. galvanized steel and various types of steel containing composite layer of protection should be used to connect or riveted nibble, shall not be used to affect the corrosion resistance of its protective layer of the welded connection method. 4. the sealing of the duct should be the main sealing of the plate connection, sealant embedded seams and other methods can be used. Methods of sealing. Sealant performance should be in line with the requirements of the use of the environment, the sealing surface should be located in the positive pressure side of the duct. 5. duct material: ordinary steel, galvanized steel, stainless steel, hard polychlorinated ethylene terephthalate (PVC), organic glass fiber reinforced plastic, inorganic glass fiber reinforced plastic (corresponding to the number of layers of glass cloth is not less than the specification, the surface shall not be anti-brass or serious frost). 6. fireproof duct of the body, the frame and fixing materials, sealing material must be non-combustible materials, its fire resistance level should be in line with the design of the fire resistance level should be in line with the design of the fire resistance level. Its fire resistance level should be in accordance with the design regulations.7. The cladding material of composite air duct must be non-combustible material inside.
Second, ventilation, air conditioning quota
(a) Ventilation ducts and components: power system: supply fan, return fan; air handling system; air delivery system: muffler, balancing valve; air distribution system: louvres, exhaust vents, air intakes 1. Ventilation ducts: thin sheet steel, glass fiber reinforced plastic and composite 2. Measurement principles: no deduction of elbows, tees, reducers; deduction of the valve components of special Measurement principles: no deduction of elbow guide vane, measurement is not deducted to apply the production and assembly quota; muffler elbow deduction, apply the muffler elbow installation. 3. fire damper, muffler, static pressure box and muffler elbow has included the installation of the support bracket. 4. When the muffler is installed in a continuous manner when the muffler is counted as 2 sections of the muffler. 5. the static pressure box unfolding area according to the 6-side calculations, without deduction of the openings. 6. concentric bends of the rectangular air ducts when the large-side length (the side of the horizontal plane) "500mm must be provided 500mm must be set when the guide vane. 7. check the hole set position: the duct is longer when the head a tail one; such as comfort air conditioning can not be set; for constant temperature and humidity air conditioning needs to be set; high and medium efficiency filters need to be set to check the holes. 8. determination of holes: dry pipe and branch pipe outlets and entrances to set up a 9. system tightness: according to the need to test the area of the air duct to m2 calculations. Leakage of light method to test unqualified air leakage test can be qualified to 10. off-site transportation: m2 calculation, only refers to the thin steel duct, static pressure box, hood class and flooding of the unfolding area. Production of off-site transportation and installation site production and installation of finished air ducts and manufacturers to negotiate whether to set off-site transportation 11. flexible hose regardless of insulation or not to section calculation.
(B) air outlet and valve components 1. residual pressure valve if used in the purification system, steel support hangers need to be calculated separately. 2. Where the valve body itself with electric actuators electric valve, its installation shall not be applied to the installation of electric actuators to install the corresponding subheading. 3. smoke vent and positive pressure air supply with actuators, set the subheading of the installation of exhaust smoke outlet with page 55. For smoke vent installation with remote control, use page 55 for smoke vent installation and page 58 for control device installation, and make up for the main material. When the motorized and valve components are integrated, only one valve component can be installed, supplementing the main material. (Such as electric multi-leaf control valve can only set a multi-leaf control valve installation, make up for the main material. 4. hood flooding flooding: calculation of the area is divided into three segments: two straight pipe end, a trapezoidal DH2H3a exhaust hood hbH1D1 ventilator exposed part of the application of the belt guard, the ventilator outdoor part of the application of the motor rain cover. 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 length of large side of the air duct, and H1=10...... >>
Question 6: What is the role of ventilation works? Is to help plant workshop workshop ventilation cooling some of the equipment can be solved workshop plant stuffy feeling! I have a few friends say that the ventilation project of Qing and the ventilation project of the National Exhibition is quite good Oh
Question 7: Ventilation project, commonly used non-metallic materials from its specifications, only flame retardant and non-flame retardant two requirements, as well as the ventilation system does not allow the use of asbestos-containing materials gaskets. Therefore, has been the ventilation system using rubber products gaskets, smoke exhaust system using asbestos products as well as the development of rubber asbestos products. With the emergence of new materials, the construction site also appeared a lot of gasket materials that seem to be more convenient to operate, such as 8501 sealing tape with gel on one side.
However, first of all, these new materials in the fire performance is not to meet the requirements of the relevant norms, it seems that there is no accurate and strict control (such as fire-resistant type test, fire certification, etc.), and from the elasticity of its sealing effect to ensure that the performance of aging, it seems to be less than the traditional rubber products are more reliable. This is the status quo, who cares?
Question 8: ventilation system engineering diagrams include what 5 points system diagrams, schematic diagrams, plans, drawings, sections and so on.
Question 9: Ventilation and air conditioning project includes what equipment installation 1, equipment stand-alone test run record 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 ventilation and air conditioning system of various types of pumps, fans, chillers, cooling towers, air conditioning units, fresh air units and other equipment in the installation is completed, should be Stand-alone test run
Question 10: fire protection and ventilation engineering technology standards include what categories of content Technical standards include project profile, project scale, project management structure and management system, construction progress, quality, materials procurement and other assurance system structure, construction programs, product protection and environmental protection, fire safety measures and security measures and structures.