Meaning of HP1 HeatPower

[N1ckXL]

Checklist

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• This only contains 1 feature request (if you have multiple feature requests, open one feature request for each feature request).
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Is your feature request related to a problem? Please describe.

No problem, just a question

Describe the solution you'd like

I was curious about the "HP 1 HeatPower" as it is not available for HP2.
In the source code I found it is calculated as "computedWaterDelta * flowRate * 1.137888".
This calculation in particular confuses me. Can you explain the meaning and purpose of "HP 1 HeatPower"?

Describe alternatives you've considered

n/a

Additional context

Thank you for your continuous work on the Quatt integration!

[marcoboers]

Currently I advise to use HP1 Power and HP2 Power. These are values calculated by Quatt and exposed through the local API.

The original thought of heatPower was that it was not exposed by Quatt back then, but was needed to calculate the COP (as well as an energy sensor).The formula is similar to the one that Quatt uses internally and is based on the heat capacity of water, flowRate and delta temperature to calculate the power. Unfortunately the heat capacity of water is also dependent on pressure and temperature so it is very hard to pick a single value that is the "best" to use in the formula. Since it might be confusing for users that didn't use it back then nor followed the discussions I'd like to remove the heatPower sensor in the near future.

The formula was provided by a user on the home assistant and tweakers forums.