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Fig. 10.11: Extraction of air into the open using an outlet duct | The duct directs the hot exhaust air directly into the open. This method is recommended if there are high temperatures in the compressor room.
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Fig. 10.12: Outlet duct with circulation flap | The outlet duct directs the hot cooling-air directly into the open. When temperatures in the installation room are cold, hot exhaust air is added to the cold room air through a circulation flap. The circulatory ventilation prevents the unit from freezing when outside temperatures are below zero. It is also recommended to have auxiliary heating to prevent a cold compressor from freezing during the start-up phase.
When this method is used, it is necessary to have an air outlet aperture dimensioned according to the flow of cooling-air in addition to the outlet duct itself.
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| <BR>Fig. 10.13: Using hot cooling-air for heating | When the outdoor temperature is cold (in Winter) duct directs all or some of the heated cooling-air from the compressor into other rooms in the building in order to heat them. When outdoor temperatures are hotter ( in Summer ) the duct emits the air directly into the open.
With this configuration, the inlet air is mostly drawn from heated rooms. This guarantees that the cooling-air is warm enough when ambient temperatures are low. The compressor then always operates above the minimum admissible temperature.
Air filters and silencers should be installed in the outlet duct in order to reduce dust and noise in the rooms heated. |