1993-1995, 2006-2007
Due to the amended regulations covering refrigerants, work on refrigeration systems may only be carried out by approved STEK workshops. In addition, only these workshops are allowed to refill the refrigerant.

2004-2006
One of the strategic goals of TRTA is to gain even more in-depth knowledge collectively in the field of refrigerated transport equipment. Key focus areas are knowledge of refrigerated transport in general, and background knowledge of refrigeration and insulation technology. One of the concrete issues that has been studied in response to this goal is the difference in heat losses between loaded and an unloaded refrigerated semi-trailers.