Cooling system and process for a paper or cardboard machine

A process of cooling one of a paper and cardboard machine with an apparatus that includes at least one closed primary cooling cycle, at least one closed secondary cooling cycle, at least one primary heat exchanger coupled to each at least one primary cooling cycle, a tertiary cooling water path comprising a cooling water feed line and a cooling water return line coupled to the one of the paper and cardboard machine, and at least one secondary heat exchanger coupled to the second cooling cycle, the process comprising:

• removing excess heat with the at least one closed primary cooling cycle;
• transferring the excess heat from the at least one closed primary cooling cycle to the at least one closed secondary cooling cycle via the at least one primary heat exchanger;
• and
• transferring the excess heat from the at least one closed secondary cooling cycle to the tertiary water path via the at least one secondary heat exchanger.

A cooling system for removing at least one of excess process heat and excess machine heat from one of a paper and cardboard machine, the cooling system comprising:

• at least one closed primary cooling cycle which removes excess heat;
• at least one closed secondary cooling cycle arranged to remove the excess heat from the at least one closed primary cooling cycle;
• at least one primary heat exchanger coupled to each at least one primary cooling cycle for transferring the excess heat from said at least one closed primary cooling cycle to said at least one closed secondary cooling cycle;
• a tertiary cooling water cycle comprising a cooling water feed line and a cooling water return line coupled to the one of the paper and cardboard machine, and a water tower;
• and
• at least one secondary heat exchanger coupled to said second cooling cycle for transferring the excess heat from said at least one closed secondary cooling cycle to said tertiary cooling water cycle.