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24 TRG-TRC005-EN
notes
period three
Evaporators
Finally, the row-split coil configuration, also called vertical-split or series-flow,
places the independently-controlled coil sections in series in the airstream. All
of the air passes through both coil sections, one before the other.
Typically, the first few upstream rows of the coil are served by one distributor,
and the remaining downstream rows by another distributor. At lower loads,
only the downstream section is active. At higher loads, the full depth of the coil
is active.
Row-split coils are very difficult to split into equal-capacity sections. Since the
air entering the downstream section of coil has already been cooled somewhat
by the upstream section of coil, the air-to-refrigerant temperature difference is
much smaller. Therefore, the downstream section of coil requires more rows of
tubes to deliver about the same capacity as the upstream section of coil. A
common row-split arrangement uses two rows for the upstream section and
Row-Split Arrangement
Figure 35
Row-Split Arrangement
80ºF
80ºF
[27ºC]
[27ºC]
55ºF
55ºF
[13ºC]
[13ºC]
70ºF
70ºF
[21ºC]
[21ºC]
Figure 36