The Chiller AlwaysOnSchedule is a compact schedule that keeps the chiller ON at all times of the day for a whole year. The chilled water loop uses two different schedules to operate properly. The chilled water loop is operated by using set-points, plant equipment operation schemes and schedules. The flowchart for the demand side connectors is provided in Figure 23.įigure 21 - EnergyPlus line diagram for the demand side of the chilled water loopįigure 22 – Flowchart for chilled water loop demand side branches and componentsįigure 23 – Flowchart for chilled water loop demand side connectorsĪs shown in the flowchart above, the load profile is attached to the chilled water loop at its designated position (the LoadProfile:Plant object can be used just like any other component) on the demand side of the loop. The flowchart for demand side branch definition is provided in Figure 22. An EnergyPlus schematic for the demand side is provided in Figure 21. This side of the loop also has eight nodes, four components, and four branches.
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Apart from the load profile, the structure of the loop is very similar to the structure of the supply side. In a more general scenario a cooling coil would take the place of the load profile and the cooling load will be simulated from the data obtained in the building system energy simulation. This load profile is input by using a Schedule:Compact object which indicates the hourly cooling loads for the annual run period. The main component in this side of the loop is the cooling load profile(instead of the cooling coil). The demand side of the loop is entered next. The flowchart for the supply side connectors is provided in Figure 20.įigure 20 – Flowchart for chilled water loop supply side connectors CW Loop Demand Side Loop Construction The flowchart for supply side branches and components is provided in Figure 19. The EnergyPlus line diagram for the Chilled Water Loop supply side is provided in Figure 18. Therefore, the branches and the connectors will set the positions of the nodes in the loop. Connectors are the objects that connect the branches together and complete the loop. This side of the loop has eight nodes, four components and four branches, while it is not required to define individual node positions in the loop, the components and branches have to be defined with an inlet and an outlet node.
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The set-point is set to the outlet node of this half of the loop the temperature at this node is controlled to regulate the operation of the chiller. The main components in the supply side of the chilled water loop are the circulation pump for the chilled water and the electric chiller that supplies the chilled water. Figure 17 - Simple flowchart for separation of half loops in the chilled water loop CW Loop Supply Side Loop Construction