【 Weak current College 】 drainage of hotspots (summary)

1 water supply

1.1 water (hot water), quotas too big
With the national water law, policy, public awareness of water-saving, water-saving sanitary ware promotion and application of water with the card, is the construction of water supply and drainage design code GB50015-2003 (hereinafter referred to as parent specification) in water (hot water), quotas are partial, fixed value for the lower limit can relax?

1.2 backflow device settings problem
To prevent backflow of water pollution, security, master specification 3.2.5 stipulates in seven parts should set the backflow device, set criteria and operability questioned: the dangerous level of pollution does not take into account, set the backflow device; consider anti-upstream (city network) pollution, prevention of pollution at source; resulting in series and parallel; the current domestic promotion of decompression-backflow device from its backflow principle determines its head loss, the shape and length; also can take the other measures of backflow contamination? as a double check valve, etc.

1.3 no negative frequency secondary water technology
To ensure the safe operation of the water distribution system, and make full use of the residual pressure of urban water supply, the prevention of secondary water pollution, saving, the current domestic water, is rapidly spreading non-vacuum frequency conversion water supply technologies. On the technology focus: from the city water supply pipeline to be direct suction whether approval: the technology of? urban water supply pipe water supply and water users maximum consumption of matching relationship; no negative frequency conversion water supply design flow how to evaluate whether an alternate to the pump; steady flow tank up? is closed? volume how to value; vacuum Suppressor up? how to ensure that air pollution secondary water?

1.4 pipeline direct drinking water system
City tap water in the feeding process, in the secondary water induced by water pollution, and more become a matter of concern. To ensure that people needed drinking water quality, to provide safe, reliable, affordable drinking water, there are two ways: to improve the existing waterworks treatment level, improvement of water distribution network, makes the water reaches the level of direct consumption; another way, that is, set the pipeline direct drinking water system. Two channels polemics of the advantages and disadvantages are without prejudice to the pipeline direct drinking water system markets exist, it would not prevent it becoming a real estate salesman selling point. The hot issue is:

(1) the scope of application: urban, community and buildings. Different application scope, and its design method is different?
(2) water treatment and water quality. Depth of water purification processing core technology is a membrane separation techniques, including microfiltration, nanofiltration and reverse osmosis. Different water treatment processes have different standards of effluent quality. Original CJ94-1999 "drinking water quality standards are considered to be the lowest pipeline direct drinking water quality standards. But what is a higher quality standard? is it pure good or mineral water?
(3) the system of water supply, metering mode, pipes and accessories selection and water protection measures;
(4) according to the mixer using the probability calculation system instantaneous peak water method.
2 drainage
2.1 drainage technology
Due to the emergence of commercial buildings and the introduction of foreign advanced technology, to enhance residential privacy, facilitate cross-drainage pipe maintenance and overhaul, drainage technology development in China. At present our drainage technology of three models, the European pattern (wall concealed) and Chinese models (l-plate falling plate), and the Japan model (drainage water) is under study.

Drainage technology direction, various patterns of usage, features? the sanitary ware, what kind of pipe and fittings» system design essentials, how to solve the problem of noise, how to prevent odour problems spill back and so are the hot issues of concern.

2.2 vacuum drainage
In recent years to meet the fast and comfortable travel needs, several rail train installed airtight vacuum toilet, went out of the vacuum drainage gratifying step. Vacuum drainage is different from how gravity drainage. Current concern is that the technology can be applied; the system requirements of the vacuum system; system design parameters; it in civil construction engineering systems of the composition, design, construction and acceptance.

2.3 water system
Water is a non-traditional water management, is to reach a sewage effluent water features, its use is to ease the scarcity of water resources, water resources of important initiatives. With running water, sewage and greywater three price rationalization, water system of social and economic benefits are increasingly apparent. But after SARS, reclaimed for residential and building community, on the public health risk posed by potential was questioned in the Shui; whether it is encouraged; urban purification system home wastewater reuse and recycling technology are the differences, if there is no essential difference between why technology is not the same; membrane and land law process in system design, construction and acceptance of experiences and lessons learned.

2.4 community recycling rainwater
Community recycling of rainwater through the collection, storage and handling to be used as a water utility, or by infiltration of rainwater, groundwater recharge, Supplement. Rainwater recycling not only can you save water, but also to maintain and improve the ecological environment of the community. As our community water recycling also has just started, so there are many interesting spots; the Community classification of rainwater recycling system; community or single building rainwater utilization and community or single building relationships in the Shui system; preliminary rainfall water pollution characteristics and exclude engineering measures; various roofing, surface runoff coefficient and rainwater recycling and infiltration; rainwater storage volume value and characteristics of the relationship between the various parts of the rainfall; rain water purification process and the use of facilities; rainwater recycling regulations.

Rainwater drainage system architecture 2.5
Building roof rainwater drainage system of flow separation: pressurized fluid, non-pressureFlow pattern and transitional flow regime. Master specification introduced Weir bucket is gravity flow water system; and the free flow of traditional 87 type bucket gravity flow systems are familiar to all transitional flow regime, which in some cases there may be performance-half pressure fluid. The above three rainwater system hotspots are: pressure and siphon roof rainwater drainage system is a system there are essential differences?? the applicability of various systems; various system return period how to value; the system how rain bucket discharge values, 87-rain bucket its discharge values should reproduce the superoxide design improve? exclusion programme implementation of rainfall, especially important for the irregular shape of the roof Super return period rainfall excluded design engineering measures.

2.6 hospital discharge
SARS, the hospital especially infectious disease hospital of drainage system design aroused great concerns:
① If waste segregation;
② disinfectant of choice;
③ disinfection contact time;
④ the cutoff when drainage conveying spill measures;
⑤ the drainage system for infectious diseases (including water) of special treatment;
⑥ drainage ventilation tube protection against atmospheric pollution engineering measures.
2.7 inspiratory valve
Master specification section 4.6.8, "shall not be setin the building air admittance valve replacement snorkel" provisions has been the focus of concern:
(1) it is necessary to execute the parent specification, but also in the special conditions set air admittance valve, how to combine the two?
(2) what special conditions?
(3) inspiratory valve setting conditions and sets requirements and location;
(4) how to troubleshoot non-stretched roof ventilation tube but with inspiratory valve drainage system positive pressure problem?
(5) inspiratory valve main performance and testing, such as sealing air admittance valve pressure drops in value not greater than 10%.

3 building hot water

3.1 circular layout of piping reverse return
Master specification 5.2.11 "circular pipe should use reverse return arrangement manner", and used the word "should". Can I relax instead of "should" to "should" focus on building community» in the water supply system operability? if not reverse return arrangement, should take measures to maintain the system heat loss balance and head loss balance?
3.2 expansion tank total volume calculation formula of
Master specification 5.4.21 stipulates the amount of domestic hot water is greater than 10m3 of closed type hot water supply system should be set pressure expansion tank. Its total volume by master specification (5.4.2) formula, from an engineering perspective, in the security context, what measures can reduce its value? △ △ ρ how to value, P how to value?

3.3 Legionella problem
Domestic hot water systems in the presence of Legionella? in open type hot water supply in serious to what extent? how much hot water temperature up to 270º breeding inhibition of Legionella? lowering the temperature of the heating water to reduce heat loss and the pros and cons of Legionella breed relationship/tubing and Legionella; sterilization methods of selection, etc.

3.4 solar hot water system
Solar hot water system is one of the focuses of real estate.
(1) the current severe shortage of China's energy, solar water heaters are not like electric water heater, gas water heater so popular, why not?
(2) solar water heater and architectural modeling how the integration between? how does not affect the architectural landscape?
(3) solar water heating system how to more reasonable? how to ensure the security, application?
(4) solar water heating system collector type and selection of operation mode;
(5) solar water heating system of antifreeze engineering measures, etc.

3.5 University City, industrial park, centralized hot water supply planning and design
Geographical dispersion of large, buildings, services, or even hundreds of thousands of people over tens of thousands of University City, industrial park, centralized hot water supply system of planning and design of hot issues are: how to choose a heat source, waste heat utilization? hot water temperature and transporting the energy consumption and investment relationships; how to determine the system of water regulating large diameter water pipe; materials; insulating pipe direct application of science and technology and engineering planning technical harmonization measures, etc.

4 building fire

4.1 fire pool settings
Under the low regulation, the provisions of the regulations, the majority of residential community, single family and tall buildings, and so should be set with pond secondary pressure. From urban planning point of view, concerns regional focus fire service, namely in the area no more fire water reservoir and pumping station, only a fire water tank and pump, pressure to meet regional fire service requirements. This scenario is viable? what problems exist? where feasible, a fire water tank volume how to determine? regional fire water supply pipe should be how to set? fire water supply of the system — and often high-voltage or low voltage, temporary water supply systems.

4.2 various water fire protection system
(1)GB50084-2001 automatic sprinkler system design planning law (hereinafter referred to as the "Jet-discipline) has been around for 3 years, but the jetted around the" designation "70 more mandatory provisions, standardized terminology and project feasibility and other aspects of continuously;
(2) as "a water mist system" alternative to gas and water-spray extinguishing systems, so we are very concerned about the various types of water mist systems application scope, conditions, characteristics of various types of fire-extinguishing system applications; designing parameter value; nozzles and pipe options.
(3) Guangdong the offer large-space intellectualized fire sprinkler system design code for approval and implementation, great repercussions. The system works and how to? what are the characteristics? "designation" spraying? system design parameters and which points in design? where the Interior headroom than 8m, 12m (warehouse) sprinkler system can use the system?

4.3 gas fire-fighting system
In 2005, China will completely eliminate halon fire extinguishing agent. Present alternatives heptafluoropropane, trifluoro methane, CO2 flue Laurent do, though, such as aerosols in engineering application several times, but only in some areas there are no local standards, national standards. Various gas fire-extinguishing system design parameters, features, applications, etc.

5 other

5.1 building pipes, pipe fittings
Drainage technology, pipes and fittings are one of the largest hotspot. Metal pipe, steel-plastic composite pipe and plastic pipe pipeline and its three main types of fittings have different scope and conditions of use, and works out the Pack, concealed, sent medium temperature, pressure, water quality, environmental conditions, technical, economic, etc. "What kind of pipe good" dispute will continue.

5.2
Swimming pool heat pump of application in the landscape design of the fountain, the fire control pump of definition, simple spray system settings, the specification is not coordinated between the provisions and standards, norms of chaos, and so on.