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Abstract
The present study explores the discrete space of possible hardware placements for a chilled-water network and seeks the optimum under specified criteria. The secondary loop chosen consists of a water-air cooling coil and five pipes: supply, bypass, coil inlet, coil outlet, and return. Chilled water at a constant temperature is driven by a constant pressure drop. Hot air flows over the coil at a constant temperature and velocity. The hardware elements are a control valve and two booster pumps. Pumping action is divided among the two pumps. A mathematical model of the thermal-hydraulic network is used as a basis for analysis. The change in operating conditions and the range of output temperatures reached are used as criteria to compare the relative merits of the different configurations. The results show that the characteristics of the control system and that of the network are strongly influenced by the location of the hardware elements.