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README.md
101
README.md
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@ -185,6 +185,55 @@ link
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| **HWP_ON** | Hot side pump powered on|
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| **Err:_errorcode_** | Error code: 1 = temperature sensor error, 2 = Hot side pressure too high 3 = cold side pressure too low|
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## T sensors abbreviations
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Abbreviations used in the documentation and firmware <br><br>
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Main sensors:
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| Abbr. | Full name |
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| ----- | -------------------- |
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| Tae | after evaporator |
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| Tbe | before evaporator |
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| Tci | cold side "input" |
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| Tco | cold side "output" |
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| Tbc | before condenser |
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| Tac | after condenser |
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| Thi | hot side "input" |
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| Tho | hot side "output" |
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| Tcrc | crankcase (compressor itself)|
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Additional sensor used in "swiming pool heater" or "water tank heater" schemes:
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| Abbr. | Full name |
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| ----- | -------------------- |
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| Ts1 | additional sensor1 |
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Additional sensors, disabled and not used by default:
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| Abbr. | Full name |
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| ----- | -------------------- |
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| Treg | regenerator temperature|
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| Ts2 | additional sensor2 |
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## Hints
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For more information about Heat Pumps look at [Wikipedia about HP](https://en.wikipedia.org/wiki/Heat_pump).<br>
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If you are interested in questions like "how refrigeration systems works" read Patrick Kotzaoglanian books.<br>
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If you want more technical details, sophisticated scmemes, "how EEV can be driven by temperature" diagrams, etc. refer to vendors manuals (you can find a lot in Alfa Laval brochures, Danfoss guides, and so on).<br>
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For refrigerants and oils types comparison see wiki.<br><br>
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## Personal experience
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Note that the SCT013 sensor and the current monitoring scheme cannot be used for accurate measurements and accurate COP calculations. Use wattmeter for accurate power measurements.<br>
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Measuring the temperature of a warm floor with sensor at one point is a bad idea - it's better to deal with temperature of the "hot in" water coming from all over the floor, as implemented in firmware.<br>
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The weather-dependent (both outdoor and indoor temperature dependent) system does not work fine for 30-150 m2 buildings. The system turns out to be difficult and works bad due to unpredictable ventilation. And also due to the unpredictability of heat emitted in the house by other sources.<br>
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I tried the scheme with a flooded evaporator in 2019 and found it extremely problematic, then refused to use it.<br>
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Deep regeneration schemes are useful only for some refrigerants and only in certain temperature ranges. I also tried deep regeneration, I was convinced that the theory coincides with the practice and then also refused this idea.<br>
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In general, it is possible by complicating the refrigeration scheme to win somewhere 1%, somewhere 3%, but all this leads to significant time and money costs, compared to not very much profit.<br>
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Summary: If you want experiments - Experiment. Want reliably and quickly - make system simple.<br>
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<br>
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## License
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GPLv3. <br>
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This product is distributed in the hope that it will be useful, but WITHOUT ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License for more details.<br>
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## Author
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<br>
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gonzho АТ web.de (c) 2018-2021<br>
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## Firmware options and fine tunings
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QA tests, uncomment to enable
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@ -320,55 +369,3 @@ Last option
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```c
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#define MAX_SEQUENTIAL_ERRORS 15 //max cycles to wait auto-clean error, ex: T sensor appears, stop compressor after counter exceeded (millis_cycle * MAX_SEQUENTIAL_ERRORS)
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```
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## T sensors abbreviations
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Abbreviations used in the documentation and firmware <br><br>
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Main sensors:
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| Abbr. | Full name |
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| ----- | -------------------- |
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| Tae | after evaporator |
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| Tbe | before evaporator |
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| Tci | cold side "input" |
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| Tco | cold side "output" |
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| Tbc | before condenser |
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| Tac | after condenser |
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| Thi | hot side "input" |
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| Tho | hot side "output" |
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| Tcrc | crankcase (compressor itself)|
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Additional sensor used in "swiming pool heater" or "water tank heater" schemes:
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| Abbr. | Full name |
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| ----- | -------------------- |
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| Ts1 | additional sensor1 |
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Additional sensors, disabled and not used by default:
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| Abbr. | Full name |
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| ----- | -------------------- |
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| Treg | regenerator temperature|
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| Ts2 | additional sensor2 |
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## Hints
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For more information about Heat Pumps look at [Wikipedia about HP](https://en.wikipedia.org/wiki/Heat_pump).<br>
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If you are interested in questions like "how refrigeration systems works" read Patrick Kotzaoglanian books.<br>
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If you want more technical details, sophisticated scmemes, "how EEV can be driven by temperature" diagrams, etc. refer to vendors manuals (you can find a lot in Alfa Laval brochures, Danfoss guides, and so on).<br>
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For refrigerants and oils types comparison see wiki.<br><br>
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## Personal experience
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Note that the SCT013 sensor and the current monitoring scheme cannot be used for accurate measurements and accurate COP calculations. Use wattmeter for accurate power measurements.<br>
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Measuring the temperature of a warm floor with sensor at one point is a bad idea - it's better to deal with temperature of the "hot in" water coming from all over the floor, as implemented in firmware.<br>
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The weather-dependent (both outdoor and indoor temperature dependent) system does not work fine for 30-150 m2 buildings. The system turns out to be difficult and works bad due to unpredictable ventilation. And also due to the unpredictability of heat emitted in the house by other sources.<br>
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I tried the scheme with a flooded evaporator in 2019 and found it extremely problematic, then refused to use it.<br>
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Deep regeneration schemes are useful only for some refrigerants and only in certain temperature ranges. I also tried deep regeneration, I was convinced that the theory coincides with the practice and then also refused this idea.<br>
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In general, it is possible by complicating the refrigeration scheme to win somewhere 1%, somewhere 3%, but all this leads to significant time and money costs, compared to not very much profit.<br>
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Summary: If you want experiments - Experiment. Want reliably and quickly - make system simple.<br>
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<br>
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## License
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GPLv3. <br><br>
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This product is distributed in the hope that it will be useful, but WITHOUT ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License for more details.<br>
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<br>
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## Author
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<br>
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gonzho АТ web.de (c) 2018-2021<br><br>
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