【 Weak current College 】 family central air-conditioning design guideline (1)---Power By 【 China power house network 】

Preface
This guide is designed for residential air conditioning, which is the traditional residential air conditioning room air conditioner (the conditioner), with the development of the times, conditioner from window type air conditioner to today's common split-type air conditioners, wall-mounted and in the machine to tank is most common, air conditioning, the air conditioning can do not need to concern themselves with professional, as long as the building professional stay necessary building elements, developed by the household or premises is responsible for the implementation of the company, as the air conditioning installation required building components can be described in the business of architecture specific design guidelines.
Due to the rapid development of China's economy, the traditional way of household air conditioners has deeply dissatisfied with, especially in the spring of 2003, the SARS virus intrusion sounded the alarm bell of air-conditioner, strongly requested to temperature as the air conditioning comfort air conditioning to health by the development of the central air conditioner, household central air conditioner is between household air-conditioning and central air conditioning between air-conditioning mode.
At present, domestic central air conditioning has the following four basic ways:
1, split air conditioning system more online
2, water source heat pump system
3, air-cooled heat pump and fan-coil air conditioning system
4, split-type air duct air conditioning system.

Household central air-conditioning design guidelines
1 General provisions
1.0.1 for home use (commercial) central air-conditioning design quality, the design with safety, utility, economy, health and protection of the environment of the basic requirements of this guideline.
1.0.2 this guideline applies to Jiangsu Province and Shanghai Municipality's hot summer and cold winter region of various types of residential construction, to comfort requirements, cooling capacity in 7 ~ 80KW family central air-conditioning design.
1.0.3 air-conditioning design, in addition to the implementation of this guideline, there should be in line with existing relevant standards and norms.
2 terminology
2.0.1 household (commercial) central air conditioning
For residential construction and general public buildings, cooling capacity in 7-80KW, with centralized air conditioning and heat source of comfort to the system.
2.0.2 air conditioning ventilation system
Air cooling, filtration, and other processing of the return air system.
3 design parameters
3.1 outdoor weather parameters
Outdoor weather parameters according to the heating, ventilation and air conditioning design code (GBJ-19-872001 Edition) appendix table and the HVAC meteorological data collection ".
3.2 indoor air quality
3.2.1 Winter indoor air calculation parameters should satisfy the following requirements:
Temperature 18 ~ 22 ° c; indoor workspace 0.4m/s wind speed <; number of ventilator;/h 1.0 times
3.2.2 air conditioning in summer, the indoor air calculation parameters shall conform to the following:
Temperature 24 ~ 26 ° c; relative humidity 65%; < indoor workspace 0.5m/s wind speed <; number of ventilator 1.0/h
3.2.3 indoor air concentrations of respirable particles should be less than 0.15mg/m3
3.2.4 ventilation and air conditioning system noise transmitted to the main room of the noise level should be less than 46db (A).
4 air conditioners design
4.1 load calculation
4.1.1 in the design phase, you can use unit construction area estimation of heat index.
(1) winter heating load index: single storey residential 80 ~ 105W/m2 multilayer and high-rise apartment 45 ~ 70W/m2
(2) summer air conditioning load index: 80 ~ 90W/m2, in the preliminary design stage, you can use a simplified breakdown, breakdown includes retaining structure, personnel, equipment, lighting, food and fresh air, which envelop load can be estimated by experience index, you can also press the hot summer and cold winter region residential building energy-saving design standards (JGJ134-2001) table limits apply in 5.0.5;
In the construction drawing design stage shall air conditioned room or area hourly cooling load calculation, and consistent with the heating, ventilation and air conditioning design code (GBJ19-872001 Edition) section 5.2.13.
4.1.2 each room air conditioner terminal equipment selection, you must consider when adjacent room not air conditioning of the formation of load within the partition.
4.1.3 in the choice of heat and cold sources, the total cooling load and thermal load should not be included in the partition of cooling load and thermal load.
4.1.4 in General, Shanghai and Jiangsu Province of the hot summer and cold winter region of residential air-conditioning cooling load is greater than the winter heat load. Therefore, the winter and summer thermal load can be multiply by experience cold load coefficient, the experience factor generally 0.5 ~ 0.7 selection.
4.2 system design
4.2.1 each household must separate systems, independent metering, independent control.
4.2.2 family is equipped with central air conditioning system must be fresh. Outdoor air ventilation for the 1st/h.
4.2.3 conditions, should give priority to the use of frequency or with energy-saving effect of variable capacity control of air conditioning systems, high-frequency equipment should comply with the national strength of harmonic standards requirements.
4.2.4 using split multiple online air conditioning system should meet the following requirements:
4.2.4.1 the same system, the need for cooling and heating at the same time, you should choose a heat recovery system of multiple online air conditioning.
4.2.4.2 refrigerant piping another piece of configuration, system control equipment selection, system construction, installation and quality approval, shall be subject to the manufacturer's technical requirements.
4.2.4.3 crack in a strong vibration of housing and residential earthquake region taking over online split air conditioning system, when using multiple online air conditioning system, you must set the system securely and to take reliable anti-vibration measures. When the refrigerant piping when deformation joint wear must set expansion device.
4.2.4.4 design more online air conditioning system should follow me homes based HVAC design unified technical requirements the multi-split air conditioner system design "(2002, total Office).
4Adoption of R410A refrigerant .2.4.5 when his pipe wall thickness should be based on product requirements, appropriate to thicken.
4.2.4.6 fresh air system should adopt aluminum alloy of sensible heat recovery ventilator machine.
4.2.5 use of water-source heat pump air conditioning system should meet the following requirements.
4.2.5.1 applies to large and medium-sized residential area, a large high-rise apartments and villas.
Select unit should 4.2.5.1.1 design State (including wet and dry bulb temperature within, into and out of the water temperature) of refrigeration and heating.
4.2.5.1.2 according to cooling load and cooling water temperature (5 ° c) calculation to determine the water source heat pump system, and to consider circulating water while using coefficient, also use coefficients generally choose according to the following conditions:
1. system cycle water less than 13l/s, simultaneous usage factor of 0.9
2. system circulating water volume is 13 ~ 19l/s, simultaneous usage factor of 0.85
3. system cycle water greater than 19l/s, simultaneous usage factor of 0.65 ~ 0.7
4.2.5.2 water temperature should be between 13 ~ 35 ° c, water should meet the needs of air conditioning load. Water should be consistent with life miscellaneous domestic water quality standards.
4.2.5.3 when using groundwater, you must follow the local government permits, and pay attention to the protection of groundwater recharge, water is not contaminated.
4.2.5.4 when use of rivers, lakes, sea water, the water must be processed to ensure the air conditioning system and safe operation of the equipment.
4.2.5.5 water source heat pump unit should strengthen the antivibration, sound processing, sound more sophisticated room should choose split water source heat pump unit. To comply with the civil code for design of building sound insulation (GBJ118-88).
4.2.5.6 fresh air system should adopt aluminum alloy sensible heat recovery ventilator machine.
4.2.5.7 for water-water heat pump system of cooling towers to choose open or closed cooling tower towers with plate heat exchangers and water filters.
4.2.5.8 system assisted heating equipment should give priority to the use of solar water heaters and urban heating network heating, cooling tower should use flame-type cooling tower, Tower should be arranged in a well-ventilated place, away from the chimney, avoid floating water and noise pollution in the environment. When not enough solar heating, use of boiler heating or electrical heating, and equipped with appropriate auto control, when the water temperature ≤ 14 ° c, i.e. start electric heating or boiler heating to reduce operating expenses.
4.2.5.9 circulating pump selection should be based on the system hydraulic calculation determined that for large and medium-sized system should equipment pumps, small system can not use the pump equipment.
4.2.5.10 plumbing system should be set, when using reverse return different path system, the branch pipes should be set flow balancing valves. Dry pipe water flow should be ≤ 1.2m/s, the branch water flow should 0.6m/s or so. Water pipe system should be ≥ 0.3% gradient. The highest minimum Office established exhaust outlet unit, indoor water pipes without insulation. Closed water systems should be set expansion tank.
4.2.5.11 when indoor air duct to set, the air duct to choose cladding for foil composite glass fiber wind pipes, tube speed 2 ~ 4m/s should be sent back to the wind speed to 0.8 ~ 1.6m/s
4.2.6 using air-cooled heat pump and fan-coil air conditioning system should meet the following requirements.
4.2.6.1 air-cooled heat pump chiller efficiency should be greater than 2.8.
4.2.6.2 air-cooled heat pump units must be small vibration, low noise, and to note the shock absorber and noise, as far as possible away from the bedroom.
4.2.6.3 suitable for air-source heat pump unit with water.
4.2.6.4 air-cooled heat pump unit shall be located in a well-ventilated place, when located in room or terrace, the vents should be bent pipe cover, so that the exhaust and inlet from short circuits, and requires the product to 50Pa ~ 100Pa over pressure of the exhaust.
4.2.6.5 air-cooled heat pump 220V power supply, 50HZ used.
4.2.6.6 indoor unit selected to closely cooperate with decoration project, and meet the indoor reasonable airflow, avoid strong blowing, and pay attention to the choice of low-noise fan coil units. Elected with air blower plate Tube, you should be aware of the requirements of the indoor clearance and meeting room good airflow, air speed inside the tube 2 ~ 4m/s should be duct should be covered with fiberglass for aluminum foil, composite duct air velocity control in 0.8 ~ 1.6m/s.
4.2.6.7 indoor water pipes and water pipes must be ensured without condensate leak, seeping, no dew drop of water, do a good thermal insulation, thermal insulation materials used rubber foam (nonflammable B1 level), the pipeline through wall worn floor must be carried out by construction of acceptance.
4.2.6.8 fresh air system use aluminum sensible heat recovery ventilator machine.
4.2.7 using split-type air duct air conditioning system, should satisfy the following requirements:
4.2.7.1 to choose low noise air conditioning equipment, and attention to vibration and sound insulation, sound attenuation.
4.2.7.2 in building clearance allows conditions, yishe double duct system, when the clearance is not high, the selection of dual-channel with difficulty, you should be aware of the return air flow, as far as possible by sending the last time of ventilation mode layout.
4.2.7.3 air-conditioning system should not be too large, a flue pipe pipe 3 ~ 4 room more appropriate.
4.2.7.4 duct composite glass fiber wind pipes should wind tube air should not be too large to control in 2 ~ 4m/s should be air velocity control in 0.8 ~ 1.6m/s. ≫ 4m high hall room, top diffuser wind speed required to check the status of Jet.
4.2.7.5 fresh air should meet 1 ~ 1.5 ventilation requirements.