| 摘要 |
An apparatus for cooling a product comprises a first evaporator (14) and a second evaporator (15) separate from the first evaporator (14), a first heat exchanger (16) incorporating the first evaporator (14) an d a second heat exchanger (17) incorporating the second evaporator (15). In operation, the product or an intermediate heat transfer medium is cooled in at least two first stages. During the first stage, heat is withdrawn from the product or the medium by the first evaporator (14) coolin g the product or the medium to an intermediate temperature. During the second stage, heat is withdrawn from the product or the medium by the second evaporator (15) further cooling the product or the medium to the desired temperature. Since the product or the medium is partially cooled by an evaporator operating at a higher evaporating temperature than required for achieving the desired temperature, an improved energy efficiency is achieved.
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