Energy is an important material foundation for the national economic development, and it’s also an important factor to restrict the national economy. China as well as the majority countries in the world is facing the energy crisis. While strengthened the energy construction, China has been paying more and more attention to maximize the efficiency of energy and reduce the energy consumption.
According to related regulations, the fixed assets projects for investment shall be designed and constructed in conformity with the standards for rational use of energy and for energy conservation design. Organs authorized with the power of examining and approving construction projects according to law may not approve the construction of projects which fail to conform to the standards for rational use of energy and for energy conservation design or accept such projects when completed. Housing construction is one of the constructions requiring energy-saving technology and specified by the Ministry of Construction.
In the urban water supply，urban water supply under different size, the pressure on general municipal water supply networks are between 0.2 ~ 0.4 MPa, can only meet three to five multi-storey building water pressure，urban land use than those in urban areas High, high-rise urban residential construction increased, and ordinary multi-storey residential floors are more than five, water pressure require the use of secondary pressure. Rational use of the pressure municipal water supply networks，use of zone water supply and new water supply facilities, energy consumption can reduce the secondary pressure. Such as the municipal water supply networks pressure to 0.3 Mpa, is five floors below and can be directly municipal water supply network, more than five no negative pressure frequency conversion of water supply equipment supply。This is not to waste municipal water supply network excess pressure and is not to lower floors of pipe network pressure too high，resulting in waste of energy and water.
Use of zone water supply，savings of use of municipal direct supply pressure energy of the some floors.
Use of no negative pressure water supply facilities compared with second traditional pressure methods (the traditional pressure methods for a municipal water supply network to pool and then pump water supply to the roof) has the following advantages: 1. Can reduce investment; the traditional pressure methods need to build pool and roof tanks, use of no negative pressure water supply facilities to remove the pool and water tanks. 2. Can reduce pollution; tap water in the pool and water tanks to increase residence time, low-margin residual chlorine in water, microbial content was high, the water with tap water after use of new equipment. 3. Can save a lot of energy; the second traditional pressure methods are to tap water directly into pool or tank, so that all of the original pressure to zero, and then re-pressurized water from zero; but no negative pressure frequency conversion equipment full use of the existing municipal water supply pressure network ,water supply networks and direct series connection, the number of poor, fill the number. 4. Can reduce water wastage, because the traditional way, pools, water tanks are concrete structures, water seepage, metal breakout, water leakage, evaporation is inevitable, and pools, water tanks to be cleaned regularly, require considerable cleaning water.
Energy-saving effect: water(1m3) pressure boost 1m need to doing work 1000kgf.m=104J, the efficiency of pump is about 0.6, if the mechanical equivalent of 1degree energy is 3617000J/KWH, it requires electric energy 0.005KWH, the average water consumption is 100L for each person. Daily calculation, if take full use of the 0.3MPa pressure of municipal water supply network, compared with traditional cistern and the second pressurize of pump, the user (a family of three) who need second pressurize will save a lot of energy. 3 people*365 days*0.1m3 for each person. Day*30m water pressure*0.005kwh=16.5KWH. Compared with traditional pressurize mode, it will save more investment. The residence community adopts the existing no-negative pressure frequency water supply devices but not using the direct water supply form which relied on the pressure of municipal water supply network.(this kind of form will cause the hydraulic pressure get too high and increase the consumption of energy and water for low-level user ). The existing no-negative pressure frequency water supply devices can save consumption of energy and water for the users within the municipal water supply network range. If we conduct reasonable water distribution network design, shared the water pipe network with the outdoor fire hydrant, it will nearly not increase the investment of pipe network. In a word, this kind of energy-saving method is quite significant. It’s cost-effective energy conservation. It should be vigorously popularize.
In accordance with water supply condition in our country, the smooth-wall water pipe is also considered to use to reducing the head loss along the pipeline. The low resistance valve and anti-backflow apparatus can reduce the head loss of localized pipeline. With the reducing of hydraulic loss, the pressure of pump water supply and the energy consumption will reduce.
Water supply and drainage for building has high potential. If we take full use of solar energy and network pressure, a lot of energy will be saved. It’s benefit event for our country and our citizen. It’s cost-effective energy conservation. It should be vigorously popularize.
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