Retrotec USACE User Manual
Page 82
60 ENERGY & PROCESS ASSESSMENT PROTOCOL
The personnel to perform CC need not to be specialists, but rather are
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well-trained standard service personnel. However, it is desirable to sup-
port them by methods provided by intelligent energy management.
Due to this, payback times for efforts in continuous commissioning
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should be less than one year or less than 5% of the energy costs.
The benefi t to the operator is then primarily through the continuous opera-
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tion of the systems and the continuous satisfaction of his customers.
7.4 Saving Potential due to Ongoing/Continuous
Commissioning
Ongoing/continuous commissioning avoids waste and helps to detect ineffi -
ciencies. This work has defi ned continuous commissioning as energy assess-
ment during building operation. We also assume that the building is optimized
through a preceding energy assessment and that most of the identifi ed energy
conservation was undertaken. Thus, we consider in this sense optimized build-
ings and building operation.
Because of changes in use, minor errors in operation, and general aging
of the equipment, deviations between 5% and 10% from the optimized state
occur. Continuous commissioning helps to avoid these deviations and keeps op-
eration near the optimum. Unfortunately, one cannot prove this in a concrete
situation except if it was agreed on a baseline derived from simulation. There-
fore, continuous commissioning is frequently introduced as part of normal op-
erations or as a follow-up measure to an energy performance contract to guar-
antee the promised savings over the duration of the contract.
7.5 Implementation of Ongoing/Continuous Commissioning
We have identifi ed six phases for OC/CC:
Develop the OC/CC plan
1.
Develop performance baselines
2.
Conduct system measurements and develop OC/CC measures
3.
Implement OC/CC measures
4.
Document comfort improvements and energy savings
5.
Keep the commissioning continuous
6.
All of them can be supported by tools.
Following our special view on OC/CC performance, the baseline and OC/
CC plan are the result of the preceding energy assessment; however, they have
to be adapted to the building conditions whenever major changes in the build-