designandimplementationofavariablefrequencyregulatorysystemforwatersupply-外文文獻(xiàn)(已修改)
2025-06-01 18:57 本頁面
【正文】 9161 88 DESIGN AND OF A VARIABLE FREQUENCY REGULATORY SYSTEM FOR WATER SUPPLY David1 . Chan Department of Electrical Ik Communications Engineering Hong Kong Technical College Tsing Yi Island Hong Kong Phone : (852) 2436 8660 and Fax : (852) 2436 8643 VVujiu Li Shanghai Electric Apparatus Co. Ltd. 1900 Shi Tei Road Slhanghai China Phone : (86) 21 65422319 and Fax : (86) 21 65167921 ABSTRACT The designs of the variable frequency constant pressure water supply for a single hydraulic pump and high power multiple hydraulic motors systems are presented in this paper. This system can save energy by controlling the speed of the pipe motors which depend upon the number of consumers in use. This system was also successfully implemented in most of the modern buildings in. Shanghai, China. Finally, the choice criteria for variable frequency regulators for water supply system will be discussed. INTRODUCTION It is inevitable to install high level water storage systems or reservoirs for a multiple story building or residential areas. This kind of system results in increasing construction cost and cleaning problems. Nevertheless, hydraulic pumps are used to raise the energy level of the water. The conventional high level reservoir system is in fact a pressure regulatory system. This pressure (head) is proportional to the height of the reservoir. Resistance of pipes is varying from time to time. When number of users increases, that means number of relief valves to be open is increased. It in turn reduces the resistance of the pipes. In order to reduce the construction cost, eliminate the cleansing problem of the high level reservoirs, and make the system simple, a variable frequency constant pressure closed loop system is presented to control the speeds of the hydraulic pumps. In this paper, the designs of the variable frequency constant pressure water supply for a single hydraulic pump and high power multiple hydraulic motors systems are presented. From static characteristics of water flow system, the critical point can be obtained to achieve the minimization of energy consumed.
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