Activities driving Refrigerant states transitions

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This composite diagram shows the Activities that drive the refrigerant states:
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The sub-activities invoked via CallBehaviorActions are all just "STUBS" that represent transformation of the Refrigerant. Each uses a SendSignalAction to cause a Transition in the previous StateMachine.

In particular, the sub-activity for the evaporator does not attempt to use the Pressure from the SensingBulb (which is normally used to adjust the degree "superheat" at the top of the evaporator), it just sets an arbitrary vapour ratio of 0.1 (by mass).

Some of the transformations in the sub-activities might be better handled with ReclassifyObjectAction instead of CreateObjectAction, however:

Before we simulate it, we'll have a quick look at some Activity allocations (functional allocation).

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