Enthalpy calc & diff

Enthalpy Calculation via minimal webserver http://0.0.0.0:8080/ alis http://localhost:8080/ .

Useful to establish e.g. in summer, when change the air with Home Assistant or similar.

Author: vespadj 2021-2022

Definitions

https://en.wikipedia.org/wiki/Enthalpy

Description

Run a Python3 server with enthalpy_server.py.

On GET request, return json "a", "b" and "diff" as difference of enthaply (a-b) per volume unit (J/mc) (J/m^3).

Usage example between outdoor and indoor air:

http://0.0.0.0:8080/28 30 0 25 80 0

returns:

{"a": 53593, "b": 76176, "diff": -22583, "unit": "J/mc"}

Look at enthalpy_core.py for parameters description and unit of measure.

The enthalpy_server.py calls enthalpy_core.py for Python2 and it requires the CoolProp library for calculation, by:

http://www.coolprop.org/fluid_properties/HumidAir.html#haprops-sample

(Authors: Ian H. Bell and the CoolProp Team)

Notes

Tested on Raspberry Pi.

CoolProp on Raspberry Pi, actually, works fine with Python2 but not with Pytohn3.

It should be considered that the results can vary greatly with a small variation in temperature and humidity, therefore with the accuracy of the temperature and humidity sensors, normally available on the market, experiments, calibrations must be carried out and the uncertainty of the measurement must not be forgotten.

For example, with two sensors +/- 1 ° C and +/- 5% relative humidity, the same room can have reading values with differences of 2 ° C and 10% hum. which may be result in an enthalpy difference of 10000 J / mc.

Requirements

• Python3
• Python2
• pip install CoolProp

Integration in Home Assistant

Look at configuration_sample.yaml, for core configuration.

Example:

realised with the HACS component

custom:multiple-entity-row (link).