period three

Evaporators

notes

The face-splitcoil configuration, also called horizontal-split or parallel-flow, is split into parallel sections. A portion of the air passes through the top section, the remainder passes through the bottom section, and the two airstreams mix downstream of the coil.

Face-Split Arrangement

 

 

 

 

 

 

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80ºF

ina

 

 

 

 

 

 

 

 

 

 

 

 

 

[27ºC]

 

 

 

 

 

 

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80ºF

 

 

 

 

 

 

 

[27ºC]

 

 

 

 

 

 

30ºF

 

 

 

 

 

 

 

 

 

 

 

 

 

 

[-1.1ºC]

55ºF

[13ºC]

Figure 33

At lower loads, only one section of the face-split coil is active. A portion of the air passes through the active lower section and is cooled, while the rest of the air passes through the inactive top section and remains unconditioned. The two airstreams mix downstream of the coil, producing average temperature and humidity conditions. At higher loads, both sections of the coil are activated, providing a more uniform leaving-air temperature.

In a VAV application, where the leaving air is controlled to a constant temperature, the active section of coil must supply colder air than the desired average temperature at part load. Consequently, the refrigerant must get colder at part load, eventually reaching a condition where the coil surface is cold enough that the water condensing from the air will create frost on the coil. Resetting the supply air temperature upward can help to avoid this problem, but this may result in space humidity problems.

In constant-volume applications, where the leaving-air temperature varies to respond to changing loads, this is not as much of a concern since the average mixed temperature rises at part-load conditions. Therefore, face-split coils are well suited for constant-volume applications. They provide better part-load humidity control than could be obtained from a large coil controlled by a single expansion valve. In a constant-volume application, the lower section of a face- split coil should be activated first and deactivated last. This sequence prevents moisture that has condensed from the air flowing through the active coil section from flowing over the fins of the inactive coil section, where it could carry over into the supply airstream.

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TRG-TRC005-EN

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Trane trg-trc005-en manual 80ºF
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trg-trc005-en specifications

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