| 摘要 |
A retrofit secondary heat exchanger adapted to transfer heat from a heat supply line into an airflow stream, which flows into ambience space in which the secondary heat exchanger is located comprising a generally vertical oriented longitudinal housing defining an internal plenum, an inflow airstream aperture at a lower elevation, an outflow airstream aperture at a higher elevation, a heat exchanger coil, mounted in the upper regions of the plenum, communicating with the heat supply line, on the one hand and a circulating pump on the other hand; and, fan means located within the plenum adapted for moving ambient air into the air inflow aperture, over the heat exchanger coil, and out the outflow airstream aperture. In a variation of the secondary heat exchanger, a cooling circuit is also included and this requires the utilization of a three-way flow valve.
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