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Section 9 Heat Exchanger Asset Monitor (HXAM)
Since the Output Records will not be updated, Asset Optimization will report the
Asset Monitor to be in BAD status, with an error string stating that various output
records will not be set. This error is not cause for concern, as this is the intended
behavior in order to correctly signal the logs and trends that the Heat Exchanger
Asset Monitor is not generating valid outputs while the inputs are bad. When the
input values return to a more reasonable range, normal training and monitoring will
resume.
The Asset Monitor will consider any data to be invalid that is equivalent to any of
the following:
•
•
•
•
•
•
3BUA000150-600
–
Delta P Cold: Alternatively, P In and P Out for cold side may be used to
calculate Delta P.
If the data values are well outside of reasonable range, then the Heat Exchanger
Asset Monitor will assume that these values are not valid data. Potential causes
for data values that are invalid include faulty transmitters. If unmistakably
invalid data values are detected, the Heat Exchanger Asset Monitor will set the
subconditions for conditions directly affected by the relevant inputs to
Instrumentation Error. Additionally, the Heat Exchanger Asset Monitor will
not proceed with training or attempt to monitor efficiency while the bad values
continue to exist. During this time most output values from the Heat Exchanger
Asset Monitor will not be updated, and their quality will be read as
BadLastKnownValue. The trend report will show dashed lines during this
period due to the bad quality of the logged data.
Individual temperatures (T Hot In, T Hot Out, T Cold Out, T Cold In) less than
0 degrees Kelvin.
Individual temperatures (T Hot In, T Hot Out, T Cold Out, T Cold In) greater
than 10,000 degrees Kelvin.
Temperature differences ((T Hot In - T Hot Out), (T Hot In - T Cold Out), or
(T Cold Out - T Cold In) less than 0 degrees Kelvin.
For a hot side condensing heat exchanger, the temperature difference
(T Hot In - T Hot Out) less than -10 degrees Kelvin.
For cold side evaporating heat exchanger, the temperature difference
(T Cold Out - T Cold In) less than -10 degrees Kelvin.
Mass flow less than 0 Kg/hr.
Description
145
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