【 Weak current College 】 family central air-conditioning design guideline (2)---Power By 【 China power house network 】

4.3 air handling and distribution
4.3.1 air-conditioning system air supply and return air clean filter processing.
4.3.2 indoor air distribution should be sent back on the way, when using the side sent back to the wind when it lay on the same side of the air below it. People should be in the air reflow, indoor air flow layout should be uniform, avoid dead ends.
4.3.3 air conditioning in the summer the temperature of air should not be greater than 10 ° c
4.3.4 room air conditioner air cycle should not be less than 5 times/h.
4.3.5 air velocity shall be based on a range of air, air, air outlet type, installation height, indoor noise and wind speed criteria allowed, etc. The noise requirements in place select wind speed in the following table:
Select a table in table 4.3.5 wind speed (m/s)
Indoor allow noise DB (A) main duct of the wind speed branch duct velocity outlet velocity (diffuser) 25 ~ 35 ≤ 2 ≤ 1.6 ≤ 0.8 ≤ 40 ≤ 3 ≤ 2.4 ≤ 1.2 ≤ 45 ≤ 4 ≤ 3.2 ≤ 1.6 ≤ 50 ≤ 5 ≤ 4 ≤ 2 ≤ 55 ≤ 6 ≤ 4.8 ≤ 2.4 ≤ 60 ≤ 7 ≤ 5.6 ≤ 2.84.3.6 back outlet should not be located in the Jet area or personnel long-term stay locations, use the focus back to the wind or walk back to the wind, the wind speed section, should not be greater than 0.5m/s. 4.3.6 to wind speed table choose the table back into the air outlet location suction speed m/s room upper 4 ~ 5 rooms close to the lower part is often where 3 ~ 4 near people often linger 1.5 ~ 2.0 for corridor air time 1.0 ~ 1.55 equipment, pipeline and arrangement
5.1 General provisions
5.1.1 equipment and piping material selection and arrangement should be consistent with national current norms, standards, regulations and requirements of local standards.
5.2 equipment materials selection
5.2.1 preferred environmental protection, energy saving air conditioning products
5.2.2 duct must be non-combustible material. When using the composite duct, the cladding material should be embarrassed burning B1 level. And harmless material.
5.2.3 rectangular duct of the aspect ratio is not greater than 4: 1.
5.2.4 condensate pipe U-PVC plastic pipe should be adopted.
5.3 equipment piping layout
5.3.1 family conditioning of machine must be placed in a well-ventilated place, safe and reliable, no use of steel bracket and expansion bolt mount on the wall.
5.3.2 on buildings near the road to install air conditioning outside the machine, its pallet bottom margin, height required 2.5m.
5.3.3 outdoor machine outlet is strictly towards adjacent side of doors and Windows, the installation location is adjacent to the bedroom door and window must not be less than the following horizontal distance.
1, machine installed capacity for 3m ≤ 2KW.
2, 5KW external machine installed capacity for 4m ≤.
3. external machine installed capacity for 5m ≤ 10KW.
4, machine installed capacity of 30KW is 6m ≤.
5.3.4 outside the walls of air-conditioning condensation water pipes should be organized.
5.3.5 condensate level tube should > 0.5% downslope.
5.3.6 air-conditioning condensation water drainage methods should be used indirectly. When the condensing pressure zone is set, the condensate outlet takes over Office must set the water bends.
6 preservation and insulation
6.1 anticorrosion
6.1.1 all non-galvanized iron fittings shall be rust after second brush antirust paint, non-thermal insulation outer surface second harmonic colour paint brush.
6.1.2 piping hangers and must be treated wood impregnation asphalt pads.
6.2 insulation
6.2.1 air conditioning pipes, ventilation pipes, cold or hot water for the return pipe, refrigerant pipes, water pipes, expansion tanks, heat storage (cold) water tank, heat exchanger, electric heater, etc. have cold, heat losses or condensation possible equipment, materials and parts required insulation.
6.2.2 non-closed-cell insulation of the external surface should be set trap layer and layer of protection.
6.2.3 insulation pipe brackets, wall or floor should prevent "cold bridge".
6.2.4 equipment and piping insulation should be based on the equipment and pipe cooling design guidelines (GB/T15586) dew calculation method to determine the thickness of the insulation layer.
6.2.5 insulation should be non-combustible and nonflammable materials.
6.2.6 through firewalls, both sides of the deformation joint 2m range of air ducts and air-type electric heater 0.8m range before and after air duct insulation must be non-combustible materials.
6.2.7 refrigerant piping insulation should be manufacturers of construction technology requirements.
6.2.8 about water temperature is 7 ~ 65 ° c with cold and hot water pipe insulation and its thickness should not be less than the table 6.2.8
Table 6.2.8 air-conditioning heat and cold water pipes minimum insulation thickness (mm)
Tube via DN ¡ü 2025 ~ 3240 ~ 507080100 ~ 125150 ≥ 200 rubber insulation glass wool Interior 27.530323535383841 outdoor 3535384141444747 insulation tube shell indoor 3030404045454550 outdoor 4040455055556060 Note: 1, only applies to Jiangsu and Shanghai area hot summer and cold winter, the canal water temperature is 7 ~ 65 degrees centigrade.
2, 20 ° c thermal conductivity of plastic, rubber into ≤ 0.04 (w/m.k), moisture resistance factor is less than 800
3, 20 ° c in centrifugal glass wool tube-shell heat conductivity in ≤ 0.042 (w/m.k), density is 64kg/m3.
The complex calculations, Jiangsu outdoor environment than Shanghai outdoor environments as well, the insulation thickness is less than Shanghai, Shanghai, Jiangsu can form.
7 monitoring and control
7.1 General provisions
7.1.1 family household central air conditioning system should be a separate monitoring and control system, automatic content should technology comparisonOK, to simplify, accurate and reliable.
7.1.2 automatically control the use of electric, supplemented by manual function.
7.2 detection and signal display
7.2.1 in the facilitate the observation, set test display device.
7.2.2 display parameters are as follows:
1, indoor air temperature, outdoor air temperature.
2. send and return air temperature.
3. air conditioning system energy independent measurement of the instantaneous measurement, dispensing and peak-time measurement.
4, the return water temperature.
5, fans, pumps, heaters, and other devices running state display.
7.2.3 air-conditioning system sensitive components and testing component installation locations, should meet the following requirements:
1, indoor and outdoor air temperature: should stay away from a heat source locations, to be representative.
2. send the backwater temperature should press factory installed.
7.3 regulation and control
7.3.1 air-conditioning systems of regulation, should be the user's control precision requirements.
7.3.2 air-conditioning centralized control system should have the following control elements:
1, equipment Kai Ding control system and interlock control.
2. equipment running status monitoring and fault protection.
3, parameter setting and display.
4. implementation of components of the control.
7.3.3 the design-time, system monitoring content selection should be based on usage requirements, user management level for technical and economical comparison.
7.3.4 when using vwv, use 2-way valve and frequency conversion water pump.
7.3.5 freeze in the winter there may be areas of new fans and air conditioning units, water coil, frost protection measures taken.
7.3.6 air conditioning and ventilation equipment should be independent of the power circuit.
7.3.7 duct heater with fan interlock, forced draft fan should delay off feature, and should be set no wind power failure protection, electric heater of wind pipes should be ground.
Choice of automatic control valve 7.3.8 should meet the following requirements:
1. water 2-way valve, with equal percentage characteristic.
2-way valve, water, use of parabola properties or linear characteristics.
3. differential pressure regulating valve of imports and exports should be consistent with the relevant provisions of the manufacturing plant and should be selected by calculation.
8 noise and vibration isolation
8.1.1 muffler design should be consistent with the civil code for design of building sound insulation (GBJ118-88) and the urban regional environmental noise standards (GB10070-88), etc.
8.1.2 anti-vibration design should comply with the urban regional environmental vibration standards (GB10070-88).
8.1.3 selecting equipment and system design, noise reduction measures should be taken of the following:
1. Select the device with high efficiency and low noise.
2. air pressure option must first evaluates the rich content should not be too large.
3. fan the use of direct transmission mode.
4. blower outlet and return to the duct outlet should not be sharp bends and adjustable.
5, elbow, three links Department Yishe Distributor, as few installed or not installed control valve.
6. when the requirements of the muffler, muffler devices installed.
8.1.4 wind tube of wind to chosen in the following table. (See table 4.3.5)
8.1.5 air-conditioner room settings should stay away from high vibration noise requirements in the room when the room has an impact on the room, you must use sound, vibration, noise, sound absorption, and other measures.
8.1.6 muffler yishe in air conditioning room, noise elimination of air pipe should not be affected by high noise or sound insulation measures should be taken.
8.2 noise and sound insulation
8.2.1 air-conditioning equipment of the sound power level, the use of the measured value.
8.2.2 Select muffler, according to the system the amount of the required noise, noise frequency characteristics and muffler acoustic performance and aerodynamic characteristics and other factors, the use of impedance compound muffler.
8.2.3 muffler to layout in airflow stable straight pipe, when necessary, also in the main and branch on settings to prevent crosstalk between the rooms.
8.2.4 room sound insulation of doors and Windows and doors should be used.
8.2.5 pipeline through wall Department must use elastic material compacting fill its gap.
8.2.6 duct connection should avoid sudden expansion or contraction connections, three links should not be used T-Word, pipes and competent connections used 45 ° clockwise flow direction of connection, the connection with the duct outlet should set the diffusion tube.
8.3 isolation
8.3.1 fan, water pump, and heat source equipment, air conditioning terminal devices and wind pipe pipe hangers should consider isolating vibration reduction measures.
8.3.2 speed when the device is less than 1500r/mm, to choose spring damper, device speed greater than 1500r/mm up to date with rubber shock absorber or vibration isolation pads.
8.3.3 using isolator should be isolator manufacturers, determined by calculation, isolator and Foundation should add a layer between elastic vibration isolation pads.
8.3.4 have vibration of equipment and systems connected duct, pipe, hose connections should be adopted. And the fire.
8.3.5 piping hangers hangers should be flexible.