It is very critical to carry out a Value Engineering Audit Of Facility, a
year after post construction and every 5-10years, especially when major modification
works has been carried out. It is expected that at this time the building power
deployment would have developed a trend that can be studied and then fully
appreciated. This trend can either validate the design or be a complete
aberration. Most of the time, the trend may be such that diesel consumption can
be drastically reduced by reviewing the Genset proposition.
An energy audit is an
inspection, survey and analysis of energy flows for energy conservation in a
building, process or system to reduce the amount of energy input into the
system without negatively affecting the output(s). In commercial, industrial
and real estate, an energy audit is the first step in identifying opportunities
to reduce energy expense and carbon footprints. When the
object of study is an occupied building then reducing energy consumption while maintaining
or improving human comfort, health and safety are of primary concern. Beyond
simply identifying the sources of energy use, an energy audit seeks to
prioritize the energy uses according to the greatest to least cost effective
opportunities for energy savings. (Wikipedia)
This
report is expected to validate the safety and functionality of power support
infrastructure and to generate a Log Book of Condition Survey and Power Audit
of the electrical services installations and upon the gathered information the
recommendations shall be proffered.
SERVICE
DISCRIPTIONS
We shall review existing
engineering documentation, protective device settings and available engineering
drawings. Our review will include:
·
All the existing as-built electrical drawings and
approvals shall be requested and inspected to confirm compliance with
prevailing panel arrangements and engineering standards.
·
Appreciation of all incoming cables to checked for
quality, reliability and review of the prevailing load, to confirm if the
present cable size will require an upgrade.
·
Load spreads for all the floors to analyse the load
balancing status and various isolation breakers and cables.
·
Load spread to confirm the occupancy
·
In view of modification made to the building,
especially through partitioning of floors, the impacts on the load spread shall
be checked for load balancing.
·
The state of the transformer, switchgears,
electrical panel (LVs and HTs), transformers and other supply equipment,
distribution boards and cables shall be checked for quality and reliability.
·
Fire risk analysis shall also be carried out to
validate preparedness to be alerted and fight any fire incidence.
·
The state of the existing Lightning Protection and
earth system shall be checked and tested.
·
Generator configuration and the Fuel consumption of
such Generator(s) shall be reviewed with respect to required redundancy, peak,
off peak and night load.
·
Diagnose various on-going losses in the facility.
We will also make detail review of the electrical
maintenance procedures and equipment for:
·
Analysis of maintenance schedule.
·
Current maintenance practice versus industrial
standard.
·
Comparison of facility schedule versus available
resource.
·
Proper grounding.
Following
the audit, a written report containing our findings and recommendations will be
provided.
GENERAL NOTES ON GENERATOR SIZING AND WORK
ARRANGEMENT
Different engines have different efficiencies but
as a very rough rule of thumb:
1. A modern
engine uses around 210litres per hour per 1000kVA.
2. So a
100kVA uses around 21 litres, a 250kVA uses around 52 litres / hour, 350kVA uses 71 litres /
hour and so on.
3. At #150/litre
and 15hours/day by 25days and 12months implies #675,000/litre/year.
4. For
1000kva genset at 210liters/hour means #142million yearly
5. For
100kva (night load) at 21litres of 10hours daily & 365days implies
#12million yearly
6. For
350kva (off peak) at 71litres of 6hours daily & 365days implies #24million
7. For
350kva by 2 at 142litres (peak period) of 8hours daily & 340days less
holidays implies #58million
8. The above
indicates that have multiple gensets suited for the load deployment create lots
of savings looking at #142million and a summation of #12M + #24M + #58M =#94
saving #48million.
Note that this is all genset at 75% load
support throughout the year. It implies the savings can be much more.
Each generator data sheet has the precise fuel
consumption figures.
Each generator (up to 800kVA) has an internal fuel
tank; normally to run for around 6 to 8 hours.
Basis for Recommendations
Critical point to note is that
the scope of our engagement does not include comprehensive check of ceiling
void and rectification of all flaws, which will require the procurement of
cables and accessories. A building services contractor must be contracted to do
that.
Our recommendations shall be
based on our findings, Loggings and consultations with the facility management
personnel and the representatives of the various tenants.
We look forward to your call for
further discussion on this proposition.
Thank you for your time.
