A transcritical refrigeration system includes a compressor, a gas cooler, an expansion device, and an evaporator. Refrigerant is circulated though the closed circuit system. Preferably, carbon dioxide is used as the refrigerant. A fan moves outdoor air that exchanges heat with the refrigerant across...http://www.google.de/patents/US6968708?utm_source=gb-gplus-sharePatent US6968708 - Refrigeration system having variable speed fan
