We speak of trigeneration when the CHP unit is supplemented by a dry cooler which allows the heat from cogeneration to be converted into cold. A common use of trigeneration is to produce heat in the winter months and cold in the summer. In addition, however, simultaneous production of all the three forms of energy at the same time is also possible. Trigeneration can be operated wherever there are requirements for the supply of cold. For example, for the air conditioning of the production or office premises, but also for the production of the process cold.