An Optimization Research On Fire Water Supply System In Large-space Buildings

Because the large space buildings exist problems of great height, great fire dangerand difficulty in extinguishing fire, the situation puts forward higher requirement forreliability and safety of the fire water supply system. With the development of societyand the growing population of large space buildings, it’s necessary to chooseappropriate system for various types of buildings. Therefore, for the purpose of meetingreliability and good economy, the commonly-used fire water supply systems of largespace buildings are taken as research objects, and the paper systematically studies fourparts as follows: these systems’ applicability, existing problems and solutions thereof inlarge space buildings, optimal selection of the fire water supply systems in differentheight interval, systems integration in the large space building from8to12metres andfrom12to25metres, the system in large space building over25meters height.To study fire water supply systems of the large space building, the first step is tounderstand their system principles and characteristics. Sereval commonly-used firewater supply systems are first briefly reviewed in this paper, such as indoor fire hydrantsystem, early inhibitive closed sprinkling fire control system with nozzles of fast action,deluge system, large space intelligent active sprinkler system, automatic tracking jet firesystem, and then their applicabilities in large space buildings are analyzed based ontechnical specifications, and existing problems of separate systems and solutions thereofare put forward.As there are so many fire water supply systems for large space buildings, it hasbeen a difficult thing to choose appropriate system for various types of buildings. Thusthe paper suggests the Analytic Hierarchy Process (AHP) should be used to analyzeavailable fire water supply systems for duildings from from8to12metres height, from12to25metres height and over25meters height, based on eight aspects: equipmentcost, operation power cost, area occupied, operation and maintenance cost, systemoverpressure degree, system reliability, difficulty level of management, plantcentralization. Then the marks for fire water supply systems by professors are collectedand processed with the mathematics software, and the better system fit for large spacebuildings in each height interval is achieved.While there are different fire water supply systems in large space buildings,systems integration should be considered from economy perspective with reliability of system ensured. Based on the optimizing results of large space buildings in the threeheight intervals, combination of the best system and others taken as examples, four partsare analyzed and studied, such as system flow, system lift, water tank and boostingvoltage stabilizing facilities. Automatic fire water cannon system which is ont suitablefor integration is also mainly discussed, and views about the system flow and whether toset the water tank different from the standard are proposed.