| 主权项 |
1. A hybrid heat exchange apparatus for indirectly transferring heat between a process fluid and ambient air, the apparatus comprising an evaporative heat transfer cell operative in a wet or dry mode; an indirect dry heat transfer cell that is only operable in a dry manner and is located upstream in an air flow when air flows through the indirect dry heat transfer cell and the evaporative heat transfer cell; and a fan for causing air to flow from the ambient atmosphere through the apparatus; the apparatus being manually or automatically controllable for turning on or off a distributor assembly of cooling liquid in the evaporative heat transfer cell and for controlling air flow through a first air passage to bypass the dry heat transfer cell to flow through the evaporative heat transfer cell, or through a second air passage through the dry heat transfer cell and then through the evaporative heat transfer cell, or to partially bypass the dry heat transfer cell through the first air passage and partially flow through the second air passage, any air flowing through the first or second air passage then flowing through the evaporative heat transfer cell, the dry heat transfer cell being upstream of the evaporative heat transfer cell;
the evaporative heat transfer cell comprising an indirect evaporative heat transfer cell with a first process fluid coil assembly through which the process fluid flows internally within the first process fluid coil assembly and which air must flow externally through in all modes and including a first process fluid inlet header and a first process fluid outlet header; the distributor assembly for selectively distributing cooling liquid from a source externally over the first process fluid coil assembly; and the fan for moving air externally through the first process fluid coil assembly and the apparatus; the dry heat transfer cell comprising a second process fluid coil assembly through which the process fluid may selectively flow internally within the second process fluid coil assembly and air may selectively flow externally through the second process fluid coil assembly, the second process fluid assembly including a second process fluid inlet header and a second process fluid outlet header; the apparatus being operable in first, second, third and fourth modes; wherein in the first mode, selectively openable and closeable air inlet dampers are open, such that the ambient air bypasses the dry heat transfer cell and flows directly through the evaporative heat transfer cell with the distributor assembly of cooling liquid turned on; wherein in the second mode, the air inlet dampers are closed, such that the ambient air flows first through the dry heat transfer cell and then directly through the evaporative heat transfer cell with the distributor assembly of cooling liquid turned off; wherein in the third mode, the air inlet dampers are closed, such that the ambient air flows first through the dry heat transfer cell, increasing the temperature of the ambient air to provide heated air, and then directly through the evaporative heat transfer cell with the distributor assembly of cooling liquid turned on; and wherein in the fourth mode, the air inlet dampers are partially open, such that first, some of the ambient air passes through the dry heat transfer cell and some of the ambient air bypasses the dry heat transfer cell, and such that the ambient air passing through the dry heat transfer cell, when mixed with the ambient air bypassing the dry heat transfer cell, increases the temperature of the mixed ambient air to provide heated mixed ambient air, and the heated mixed ambient air then directly flows through the evaporative heat transfer cell with the distributor assembly of cooling liquid turned on. |
