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Direct expansion air conditioning used "directly" as the refrigerant coolant to remove the heat outward and forward inside the room to be conditioned.
Compared air conditioning chilled water (water regime around6 ° /12 ° C) through an intermediate fluid, water, and to carry forward the refrigeration to air conditioning units said terminal. The advantage (or disadvantage) of the direct expansion is to avoid this fluid "extra water", however the transport technology refrigerants is in some more complicated than the well-known water plumber simple applications heating.
In addition, the handling of refrigerants is more restrictive, as well as concentration problems (eg in local ERP type hotels). The fineness of control is also easier to manage with the fluid "ice water" with the refrigerant, the fresh air cooling also, etc element ...
Air-conditioning systems of large, greater than200 kW, are traditionally made of water ice. Without this threshold is immovable as direct expansion air conditioning VRV type may be conditioned dozens of local and even more when outdoor units are multiplied.
Although this is not a rule, air conditioning chilled water will be selected for applications tertiary or industrial. The habitat will be equipped with air conditioning direct expansion.
This rule is being questioned more and more as in housing, heating needs covered with hot water heat pump are also common.
The heat pump (reversible air conditioner) is classified as renewable energy equipment because of the COP product and low temperature use with underfloor heating for example.
And the best economizer is water side.
