Which is an example of a fault-detection rule for a water-cooled chiller?

Which is an example of a fault-detection rule for a water-cooled chiller?

• A. The condenser water flow rate drops below expected while temperatures remain unchanged.
• B. Condenser pressure rises due to high ambient temps.
• C. Condenser approach temperature decreases unexpectedly.
• D. Condenser water flow rate is lower than expected with unaffected temperatures suggests flow issue.

Answer: (D)

Fault-detection rules for a water-cooled chiller rely on identifying when a variable relationship happens that shouldn’t under normal operation. In this scenario, the condenser is cooled by water, so the expected behavior is that if the condenser water flow is lower than what the system demands, you’d typically see a change in heat rejection reflected in temperatures or pressures. If instead the flow is lower but the condenser temperatures stay essentially the same, that mismatch flags a fault: there’s an abnormal condition in the flow path (like a pump issue or a blockage) that the system isn’t yet expressing through the usual thermal response, but still deserves attention. This is the clearest way to detect a potential flow fault because it hinges on an inconsistency between an input (flow) and the expected output (temperature behavior). The other options either describe effects caused by ambient conditions (which aren’t faults in the chiller’s flow loop) or indicate different thermal responses that don’t specifically isolate a flow fault in the condenser loop.

Fault-detection rules for a water-cooled chiller rely on identifying when a variable relationship happens that shouldn’t under normal operation. In this scenario, the condenser is cooled by water, so the expected behavior is that if the condenser water flow is lower than what the system demands, you’d typically see a change in heat rejection reflected in temperatures or pressures. If instead the flow is lower but the condenser temperatures stay essentially the same, that mismatch flags a fault: there’s an abnormal condition in the flow path (like a pump issue or a blockage) that the system isn’t yet expressing through the usual thermal response, but still deserves attention. This is the clearest way to detect a potential flow fault because it hinges on an inconsistency between an input (flow) and the expected output (temperature behavior). The other options either describe effects caused by ambient conditions (which aren’t faults in the chiller’s flow loop) or indicate different thermal responses that don’t specifically isolate a flow fault in the condenser loop.