The test setup represents any process where two independent and unrelated inputs, in this case flow and inlet temperature, affect output in a predictable way allowing the process model to respond to both. This approach provides a more immediate process adjustment for two variable inputs and should keep the temperature more stable than a conventional loop. The objective is to control the output temperature, not with a PID loop or high/low thermostat-like control, but by measuring the inlet water temperature and flow rate, and calculating the amount of added heat necessary to reach the outlet temperature setpoint.
The process in this case is a small hot-water heater. Based on F IN and T IN, the program determines how much heat needs to be added.
Figure 1: The process controller acts entirely on the process model and does not have a measurement of T OUT available.
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