Cold water cooling with heat recovery

A drinking water supply system (1) with circulation cooling comprising a cold water line system (2) with at least one consumer (3) arranged thereon, a connection (4) to a public water supply network, a pump (5) for producing a volumetric flow rate in a cold water circuit in the cold water line system (2), and at least one cold water return line (11, 16) and also a refrigeration unit (7), characterized in that the drinking water supply system (1) comprises a primary low-temperature loop (8) and a secondary high-temperature loop (23), wherein the refrigeration unit (7) is connected to the primary low-temperature loop (8) and the secondary high-temperature loop (23), wherein arranged in the cold water line system (2) for cooling of the cold water is a heat exchanger (10) which withdraws heat energy from the cold water and is coupled to the refrigeration unit (7) such that the heat exchanger (10) releases or transfers the heat energy of the cold water to the refrigeration unit (7) by means of the primary low-temperature loop (8) and the refrigeration unit (7) makes the withdrawn heat energy available to the high-temperature loop (23).