Overview of water supply and drainage technology f

2022-07-25
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Overview of building water supply and drainage technology (2)

3 About hot water supply

hot water supply technology is the weak link of building water supply and drainage technology. However, in recent years, due to the improvement of building standards and the popularity of hot water supply projects, hot water supply technology has also developed significantly

3.1 heating methods of hot water and equipment heat

the heating methods of water include direct heating and indirect heat exchange. Among the heating equipment using hot water boilers, gas-fired hot water boilers and oil fired hot water boilers are mainly used. Generally speaking, the efficiency of primary heat exchange is higher than that of secondary heat exchange. The fully automatic and high-efficiency hot-water boiler researched in China has basically solved the safety problem of hot-water boilers located upstairs, so as to be applicable to areas without heat pipes in the south of China. In direct heating, great progress has also been made in the use of solar energy. In recent years, China has also carried out many discussions on large initial investment in hot water supply, heating methods and equipment. In terms of indirect heating mode, it plays a leading and exemplary role in the development of strategic rare and precious metal recycling industry. The heat medium used is mainly steam and hot water. The theory of its heat exchange equipment has been developed to a certain extent, and the concept of "turbulent heating" has been put forward for the design of volumetric water heating, that is, to improve the heat medium Northcote expects to use this kind of material and technology and the flow rate of the heated water on the refrigerator to be launched next year, so as to improve the heat transfer effect by increasing the heat medium's heat release coefficient to the pipe wall and the heat release coefficient of the pipe wall to the heated water. In the secondary heating equipment, there are diversion type positive displacement heat exchanger, semi positive displacement heat exchanger and semi instantaneous heat exchanger. It has been realized in the design that the heating equipment shall be reasonably and economically selected by comprehensively considering the safety, progressiveness, one-time investment and floor area of the equipment

3.2 energy saving

energy saving of hot water supply system is the focus of building water supply and drainage energy saving, and its energy-saving measures mainly include: increasing water supply temperature; Reduce the service temperature; Reduce the hot water consumption and reduce the flow rate on the premise of meeting the use requirements; Reduce heat loss and adopt high-efficiency insulation materials; Improve heating mode and hot water system; Improve the heat transfer efficiency of water heater; Utilize new heat sources; Water quality treatment of hot water with energy-saving products is mainly to prevent scaling of hot water, damage to equipment pipelines and reduce heat transfer efficiency. When the water consumption is large and the water quality is poor, the centralized hot water supply system shall soften the water quality before heating. In addition to dosing treatment, electrostatic treatment technology, electronic treatment technology and magnetization treatment technology are also used in the treatment technology to ensure the stability of the hot water quality in the circulation. In addition, Legionella in hot water has also attracted attention. China has improved the volume and structure of water heaters or fouls, and adopted certain conditions to inhibit the breeding of bacteria and Legionella

4. About building fire extinguishing technology

4.1 fire hydrant water supply system

building fire extinguishing design has become an important part of building water supply and drainage. In the fire hydrant water supply system, more attention is paid to extinguishing the initial fire, and the stabilized pressure pump is often used to maintain the constant high pressure of the system. A small caliber self rescue water gun shall be added to provide it to non fire professionals for self rescue. Pressure reducing valve, multi outlet water pump and pressure stabilizing valve can be used in the partition to ensure the water pressure and water output of the fire hydrant. In order to ensure that the fire extinguishing device can be put into operation in time, the automatic switching device between the working pump and the standby pump is strengthened

4.2 automatic sprinkler technology in recent years, China has established the principle of gradual transition from fire hydrant water supply system to automatic sprinkler system. The development of high-rise, super high-rise and large-scale industrial buildings has strengthened the application of automatic sprinkler technology. In addition to the automatic sprinkler heads, which are set in places prone to fire, evacuation passages and densely populated places, they are also expanded to be set in fire spreading passages, places where fire is not easy to be found, places where fire is not easy to be extinguished and places where water cooling protection is required, so as to make fire fighting more timely and faster. This is also a major measure for China's fire water supply system to gradually integrate with the developed countries. In high-rise buildings, for glass curtain walls, atrium corridors, escalator openings and ordinary fire shutter, sprinkler encryption is adopted to replace the water curtain. The introduction of products in the elevated warehouse is bad for the brand. It criticizes the foreign large water drop sprinkler and ESFR sprinkler, and introduces the sprinkler from "fire control" to "fire extinguishing". In addition, for high-rise buildings with a building height of more than 100m, corresponding fire-fighting measures have been taken, such as setting up refuge floors, refuge areas and helicopter aprons on the roof, and corresponding fire-fighting water supply facilities have also been provided

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