Commons system utilizing a rather simple arrangement of the refrigeration cycle.
Air to Air refrigeration device is used (in contrast to water to water, not applicable here)
- Air is directly passed over the evaporator coil in which the refrigerant is expanding from a liquid to a gas
- Heat is moved from the indoor air to the outdoor air by the step up action or heat pumping nature of the refrigeration cycle.
- Indoor air cooled in this manner by the expanding refrigerant is usually know as "direct expansion.
- The cooling coils are therefore often referred to as DX coils.
- Compressor-condenser unit is placed outdoors on a concrete slab or on the roof, causing noise and heat, must be taken into account for planning.
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