preheating heat pump products

Process for hot filling liquid, in particular juice, a flash (12, 60, 62, 90, 92) pasteurizer comprising a first heat exchanger (12, 62, 92), a packing station (15 ) for packaging liquids in containers (25), for example bottles, and a cooling tunnel (20, 70) comprises a plurality of cooling cells (20.1 - 20.6, 70.1 - 70.6) for cooling containers (25) packaged by a cooling liquid, for example water, wherein the liquid is heated in the flash (12, 60, 62, 90, 92) before packing into containers (25) pasteurizer in the packaging station (15) to feed thermal energy of the cooling liquid heated in the cooling operation of the cooling tunnel (20, 70) via a separate heat pump (30, 50, 80) to flash (12, 60, 62, 90, 92) pasteurizer.