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@ -285,8 +285,8 @@ You can build your own "tube-in-tube" heat exchangers. It's not hard. Cheaper. T
<img src="./m_tube-in-tube_diy1.jpg" width="400"> <img src="./m_tube-in-tube_diy2.jpg" width="400"><br><br>
Additionally, you can think "I'll take an old AC parts... Housing... Slightly change... An hour or two, day of work maximum and I'll get a refrigerant<->water heat exchanger in for a penny!". This idea is obvious. It was the first thing I've tried. You can try this, but to achieve "not very bad" performance it'll take more than a one day and much more than a few $$, even if you have unlimited access to older ACs.<br>
Ok, I think that's enough for this appendix, this is a controller page, and not how-to-build-refrigeration-systems page.<br>
{-Overall, your system with sensors positions will look like at drawing below. Refrigerators (heat pumps) are very simple devices. -}
<img src="./m_HeatPump_scheme2.png" width="500"><br><br>
Overall, your system with sensor locations will look like at a scheme below. Refrigerators (heat pumps) are simple devices. If you do not need to control over all temperatures, disable and do not use (install) unnecessary sensors.<br>
<img src="./m_Valden_Heat_Pump_Controller_model.jpg" width="1000"><br><br>
## Appendix D: Firmware options and fine-tuning