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RFI – intermediate fluid heat recovery units
These systems are made up of one, two or more finned coils which transfer heat from an aeriform current at high temperature to one or more gaseous currents at lower temperature by means of a third fluid which plays a leading role for the heat transfer.
Recovery of sensible heat and latent heat (condensation).
The intermediate fluid circulates in a closed circuit coming in contact with all the batteries.
This fluid transports the sensitive heat due from the temperature and also recovers the latent heat released from the possible presence of moisture. (condensing recovery)
The employed intermediate fluids in the engineering plants are water, glycol water or diathermic oil and they generally flow by means of a circulation pump.
Efficiencies and temperature limits
Efficiencies can reach up to 75%, while the operating temperatures on the hot side can exceed 600° C.
Return on investment
This type of heat recovery unit provides many important advantages (see RFI model).
It offers an excellent adaptation both at the heat source and during the use, with a significant impact on the cost and on the return on investment. In a first step the amortization will only refer to the cost of the concerned batteries and subsequently it will involve the total cost of the installation (see total cost of installation plant).
Technical and Construction specifications
Construction materials hot battery: Inox/Inox – Fe/Fe
Construction materials cold battery: Stainless / stainless steel - inox/Al- Fe/Fe- Fe / Al. Cu / Al --
This card is subjected to perodic updates.
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