In hydronic systems the exchange fluid with the internal environment is the water that is sent to the terminals of planting or is used for domestic hot water.
The fluid exchange with the outside depends instead on the external power source: if heat is exchanged with the outside air exchange fluid is the'Air stessa.Nel case of wells or aquifers, the exchange fluid is l 'water same in the case of direct use or Brine in an intermediate circuit.
In the case in which energy is exchanged with the Plot (Geothermal energy) the exchange fluid is brine that flows into an intermediate circuit arranged horizontally or vertically in depth in the ground.
The exchange fluids with environments, outer and inner, also determine the denomination of heat pumps, which are identified by two names: the first indication of the means of exchange with the outside and the second indicative of the medium of exchange with l ' room to be conditioned.
A heat pump air to water is a heat pump that has air as a medium of exchange
outside and the water as a medium of exchange with the indoor environment.
In function of the exchange means there is a first classification of heat pumps, consisting of:
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