| 摘要 |
A heat recovery unit for use in association with a fluid distribution system including: a heat exchanger; means to: circulate fluid through said system and to introduce fresh fluid across one end of said heat exchanger and into said system for mixing with the circulating fluid; ventilate a portion of the circulating fluid across the other end of said heat exchanger to transfer the thermal energy between said ventilated fluid and said fresh fluid so as to replenish said ventilated fluid with said fresh fluid.
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