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In the “direct expansion” systems, the refrigerant fluid directly
exchanges the heat with the air to air-condition. Very often this means that the
fluid must complete very long journeys in order to reach the internal units located
into the premises to air-condition, generating different drawbacks.
This type of system is suitable for the conditioning of a small number
of modest dimension premises.
However, when it is necessary to supply air conditioning for numerous,
large premises, i.e. yachts, the best is either the hydronic air conditioning
or the “refrigerated water” system”. The heart of these circuits is the chiller or “water cooler" which is linked to a
series of peripheral organs, called fan coils, installed in every environment to
air-condition. The whole refrigerating process happens inside of the chiller,
in which the cooling fluid is lodged and the heat transfer is entrusted to the
water which is the only substance to circulate in the piping system, which
crosses the structure-ship, cooled during the summer and heated during the winter.
The main advantages of the hydronic air conditioning system, compared to
the “direct expansion” one, are the following:
• the refrigerant fluid has a
shorter journey, with consequent lightening of the job of the compressor;
• much rarer and easily detectable
refrigerant fluid leakages, as the fluid covers only the short and compact
circuit inside of the chiller;
• in case of fire, the premises
remain free from the emissions of toxic substances.
• steadier and more accurate
temperature control, thanks to the thermal inertia of water.
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