Since the loop capacitance has a stability requirement of ( ˙ V Δ t s t e p / V ) ≤ 1 the volume is set so that the stability requirement will be 0.8 at the zone time step, which is the largest time step encountered at the max flow rate the loop can reach. The loop maximum volumetric flow rate (m 3) is just set equal to the value stored in the PlantSizData array for this loop. Hot and Chilled Water Loop Sizing Maximum Loop Volumetric Flow Rate This array also contains the user specified design values for each plant loop. These individual component design water flow rates are then accessed, summed for each plant loop, and stored in the PlantSizingData array. Each component that uses water for heating or cooling stores its design water flow rate (in its sizing routine) in the array CompDesWaterFlow, labeled by its inlet water supply node number. And for condenser loops - various types of chiller that use condenser water for cooling. For chilled water loops these components will be cooling coils. The design plant loop flow rates are set by the sum of the needs of the demanding components on each loop. The program needs to be able to autosize the fluid flow rate in each plant fluid loop.
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