Study And Optimization Of Pressure Water Supply Equipment

Pressure water supply equipment is directly connected with municipal water supply pipe network, without any regulating construction. Making full use of the residual pressure of municipal water, it gives more pressure to municipal water and saves municipal water quality. It makes a contrbution to building energy saving. As the engineer of building water supply, it is necessary to do justice to pressure water supply equipment’s advantages and disadvantages. In actual project, choosing the right pressure water supply equipment, including choosing pump units, steady flow tank, pressure tank and the control way, determines energy saving. According to the composition of pressure water supply equipment, this article studied that:(1) the characteristics of domestic and foreign brands’ pressure water supply equipments;(2) steady flow equipment’s(i.e. anti negative pressure device) working principle, design and control;(3) variable frequency pump combination rules and operating conditions, the ways of choosing pump units;(4) pressure tank whether needed and researching a new way of calculating pressure tank volume;(5) Optimization of variable frequency and constant pressure control logic.The following conclusions are obtained:(1) The characteristics of pressure water supply equipments sold in China include, a. Steady flow tanks with rubber capsule are different with ones without, and they all cannot solve the problem when the flow absorbing from municipal is shorting; b. Pump units getting from the same types of parallel operation to the different size of the pumps of parallel operation; c. There is no uniform standards to calculate pressure tank’s volume; d. Steady flow tanks’ automatic control, which with rubber capsile, is more complex than which without, and variable frequency constant pressure control way is "who start first stop first”.(2) The time of steady flow tank(i.e. anti negative pressure device) to prevent the pump absorbing excess water from the municipal pipe is short, and electric exhaust valve is effective to exhaust gases.(3)Having analysed pump combination by Excel proves the advantages of different types of pumps combination and following the way to elect pump size according to the rated flow 2:1 is effective, reasonably to estimate the needing of water supply at night can guide to choose the litter pump.(4) Have put forward the method of calculating pressure tank’s volume, and if the flow is beyond some range, a litter bump can instead of the pressure tank.(5) The new control logic can make the pump unites to run in high efficiency area for a long time, to save building energy.