Drying systems with improved energy efficiency and capacity control

摘要

The present invention relates to a drying system (1) comprising a drying plant (2) and a heat pump assembly (3), in which the heat pump assembly (3) operates with a primary fluid, To at least two heat sources and at least one heat sink by means of heat exchangers (41-45, 51-59). The heat sources are used for dew-dehumidification of the process gas entering the drying plant in at least one of the heat exchangers (41) and for at least one of the heat exchangers (42) And / or recovery of sensible heat. The heat sink may comprise preheating of the process gases used in the drying plant in at least one heat exchanger (51) of the heat exchangers. In addition, a method of incorporating the heat pump assembly into the drying system has been devised. According to the present invention, the capability of the drying plant can be increased while reducing the energy demand.