Method for managing a heat pump operating with a low environmental impact operating fluid

Method for the management and control of a heat pump based on a compression/expansion thermodynamic cycle of an operating fluid and comprising at least:

• a first heat exchanger wherein said operating fluid absorbs, at constant pressure, heat energy from a cold well,
• a second heat exchanger wherein said operating fluid yields, at constant pressure, part of its heat energy to a hot well,
• an expansion valve placed between said first and second heat exchanger and adapted to carry out a constant enthalpy expansion and cooling of said operating fluid,
• a compressor adapted to compress said operating fluid between a minimum pressure thereof that it has at an outlet of said first heat exchanger and a maximum pressure thereof that it has at an inlet of said second heat exchanger, said compressor being able to suck and compress a wet operating fluid with a suitable percentage of liquid fraction,
• at least one temperature sensor (T.com) for the detection of a delivery temperature Tm of said compressor,
• at least one temperature sensor (T.evap) for the detection of an evaporation temperature SST in said first exchanger,
• at least one temperature sensor (T.cond) for detecting a condensation temperature SDT in said second exchanger,
• wherein a temperature difference between the lubricating oil in the compressor and said operating fluid at the delivery of the same compressor is kept equal to or greater than a safety threshold OIL_SH such that there is no condensation of said operating fluid in said lubricating oil, i.e. such that the following relationship is verified:
• Toil−Tm≥OIL_SH.