An Analytical Approach for the Optimal Operation of Pumps in Booster   Systems
  The operation of pumps and booster systems accounts for 10% of the yearly energy consumption in Europe. Booster systems are used to ensure the water supply in multi-story buildings, office buildings and public institutions. The question arises how to operate a booster system in order to achieve an optimum in power consumption. In the present paper we derive the conditions for optimal operation. 
T. F. Gro{\ss}, P. F. P\"ottgen and P. F. Pelz
math.OC