This is an instrumented heat pump based on thermoelectric elements and an array of TMP102 sensors.
Operation is entirely single-threaded with co-operative scheduling, as best as I could manage it without explicitly building a faculty to do it better. Might use my scheduler class in the future.
This project depends on ManuvrPlatforms to provide the fill-in for AbstractPlatform as appropriate for the Teensy4. It must be pulled into the lib folder.
This project depends on ManuvrDrivers to support most of the hardware. It must be pulled into the lib folder.
The originally purpose of this machine was to be a water chiller for closed-loop heat-exchange in the context of a chemistry lab. IE, pumping heat out of condensers and reactor jackets. As such, the machine needs to be able to pump nearly a kilowatt of waste heat. Now... moving heat is usually very extravagant of energy, and a machine that has a pumping capacity of 1 kilowatt, will end up producing at least several hundred Watts of waste heat of its own (which it must also remove). Weight adds weight.
A machine that draws 1500W out of the wall should probably not be left unattended for as long as it might take a chemical reaction to complete. The power supply for this machine will happily turn the heat exchangers to lava and start a fire if some critical part fails. It also needs to not turn the cold side of the pump to ice when the thermal flux falls.
So it needs to monitor heat flows through the machine, and possibly take actions when some user-defined set of homeostatic parameters is violated.
Coolant flow through the following thermal elements is monitored for temperature (both in and out):
* The radiator
* The cold-side heat exchanger
* The hot-side heat exchanger(s)
The ambient air temperature, and speed of the radiator fans is also monitored. This data both informs the thermal model, and ensures machine safety.
Current flows through the following electrical elements is monitored, and used to constrain the thermal model:
* The power cord
* The TEC elements
* The pumps and fans (as a single group)
* *Low-differential, high efficiency:* Both banks of TECs are cooling the center exchanger, which is the pump's cold side.
* *High differential, low efficiency:* One TEC bank is cooling the hot side of the other. This allows operation down to the minimum temperature of -55C, at the cost of a rough quartering of the pump's capacity.
Original code is Apache 2.0.
Code adapted from others' work inherits their license terms, which were preserved in the commentary where it applies.
The assets directory contains the source images for icons used in the program. I am under the impression that this is all free clipart.