period two

Condensers

notes

Air-Cooled Condenser Control

damper

AB

condenser airflow

fan A

fan B

fan A

heat rejection capacity

Figure 21

A common method of controlling the capacity of an air-cooled condenser is to vary the airflow across the condenser coil. The heat-rejection rate of a multiple- fan condenser is often controlled by cycling fans on and off to maintain acceptable condensing pressures. Alternatively, the airflow across the coil can be varied by using a damper or a variable-speed drive on one or more of the fans.

In this example, a damper has been added to one of the two condenser fans. Capacity control is accomplished by cycling fan B on and off while varying the airflow of fan A by modulating the damper. Both the damper and the cycled fan are controlled by condensing pressure. As the heat-rejection requirement increases, fan A continues to open its damper farther to increase its airflow. When fan A reaches full airflow, fan B turns on and fan A modulates its damper to continue to match the desired heat rejection rate.

Condenser Flooding Control

B

C

A

liquid receiver

condenser

expansion valve

evaporator

discharge line

compressor

Figure 22

Another, less common method of controlling the capacity of an air-cooled

14

TRG-TRC005-EN

Page 21
Image 21
Trane trg-trc005-en manual Air-Cooled Condenser Control, Condenser Flooding Control

trg-trc005-en specifications

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