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absalom-muc / MHI-AC-Ctrl

Reads and writes data (e.g. power, mode, fan status etc.) from/to a Mitsubishi Heavy Industries (MHI) air conditioner (AC) via SPI controlled by MQTT
MIT License
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Does one know - PressureValues, HP, LP are these Values available ? #115

Closed seepv closed 11 months ago

seepv commented 1 year ago

Are the PressureValues, HP and LP (25, 26) available for maybe all SRKs or do they get calculated in f.e. the RC-E5 or RC-EX?

absalom-muc commented 1 year ago

At least my AC indoor unit SRK 35 ZS-S doesn't support the PressureValues, HP and LP (25, 26).

seepv commented 1 year ago

Related to this Source https://www.researchgate.net/publication/225309224_Variable_fuzzy_control_for_heat_pump_operation discharge superheat (Tsh) equals discharge temperature (Td) - condenser temperature (Tc). Tsh = Td - Tc or for an SRK: TDSH = TD - THI-R1.

LP ≙ THI-R1 (Middle of the IndoorCoil/Evaporator in CoolingOperation) and HP ≙ THI-R1 (Middle of the IndoorCoil/Condensor in HeatingOperation).

THI-R1 is the condenser temperature (in HeatingOperation) and can be converted to HP by one of the following Tables: https://hvac-eng.com/refrigerants-p-h-diagram/

The Middle of the OutdoorCoil could be THO-R1. THI-R1 would than analogue HP in CoolingOperation or LP in HeatingOperation.

glsf91 commented 11 months ago

Closed because of no activity for a long time