| 摘要 |
A heat recovery system has a heat exchanger provided with a first tube bundle for circulating a first fluid which does not change its phase state and a second tube bundle for circulating a second fluid which changes its phase state, the heat exchanger being also provided with a shell which accommodates the tube bundles arranged in series in the shell, so that when a third fluid is circulated through the shell it successively contacts the tube bundles for a heat transfer between the third fluid and a respective one of the two first-mentioned fluids.
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