engleski

Energy Saving Possibilities in Water Supply Pumping Systems

When the water is pumped through a centrifugal pump the most of the consumed electric energy is spent on reaching the pressure values required by the system. Since the maximum demand occurs in a relatively short period of time, for most of the time water supply system with high demand variability will be characterized with a pressure higher than required. Considering the usual centrifugal head/flow characteristics of the pump, low demand results with high pressure values and thus unnecessary energy consumption. Different demand/pressure relationships are usually considered by changing the rotational speed of the pump. Recently the most popular type of variable speed control became the variable frequency drive. The usual way to regulate the pressure in a water supply system with speed controlled pumps is with constant or proportional pressure values. This paper deals with the comparison of energy consumption when constant pressure or proportional pressure control is used. The possibility for energy savings are examined using the numerical model of pumped water supply system of the city Velika Gorica in Croatia.

Energy savings ; pumped water supply system ; pump speed control

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