Abstract
The production of chilled water in ice-based thermal storage systems presents unique operational considerations. The parameters controlling the generation and utilisation of chilled water are functions of the intended strategy for the production and use of the chilled water, the physical arrangement of the components, and the amount of storage available for heat rejection. The storage priority strategy investigated in this study involves limiting the storage capacity of the installation so that it meets the predicted (or actual) load to such a capacity that it is fully depleted at the end of the occupation period. As cooling load and chilled-water return temperatures vary, the temperature of the water leaving the heat exchanger of the storage system is controlled at a constant temperature to balance the load between the storage and series chiller to ensure optimal depletion of the thermal store. Load-limiting control optimises the plant's electrical power use. By using the integrated load profile produced from the simulation results it is possible to use a predictive control strategy that minimises the cooling plant loads.
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