Every MLR003R device contains a “Thermoelectic Generator (TEG)” element, that generates electrical energy when there is a temperature difference.
The TEG harvests energy from the temperature difference between the heating flow temperature and the ambient temperature (usually room temperature).
The MLR003R comes with an Aluminum housing as functional part to generate electrical energy.
The actuator has a valve-side temperature sensor to determine the flow pipe temperature and an ambient sensor to determine the ambient temperature which is located away from the flow sensor
There are two compensations performed on the ambient and the flow sensor respectively
The ambient temperature estimation is used to reduce/compensate the temperature difference at the ambient sensor caused by the increased Aluminum housing temperature.
A controllable offset for the flow sensor has been added to compensate for the temperature drop between the hot water and the sensor element located in the actuator’s aluminum valve adapter.
To obtain an estimate of the ambient temperature, the device measures the flow temperature every 5 minutes and performs a moving average across the last 30 minutes.
It then performs the following computation
The offset value for the Flow Temperature can be set via Downlink on FPORT 0x08
