Ingenieur Vol. 75 ingenieur July 2018-FA | Page 70

INGENIEUR
this is where the measurement and verification
exercise is indispensable.
The post-retrofit M&V of the new system took
place from August 21, 2017 to August 25, 2017
with the same parameters being measured as
those used in pre-retrofit, the activity of which is
shown in Figure 9.
DISCUSSION
Energy savings were determined by subtracting
the total energy use of the new system from the
total energy use of the old system. The overall
summary of the energy performance for the blocks
A and B is shown in Table 2.
It was found that the overall energy
consumption of the chiller plant was 33% lower
than the old installation. This translates into
795,500 kWh per year energy saved and 552
tonnes/year of CO 2 emission avoided.
The overall new chiller plant efficiency is as
shown in Table 3.
Table 3: Chiller Post-Retrofit Efficiency
Chiller
Power
Efficiency MS 1525
Requirement
(kW)
(kW/RT)
(kW/RT)
Block A
119.9
0.62
0.66
Block B
168.7
0.56
0.60
It was found that the overall chiller
performance for Block A and Block B are better
than the minimum requirement according to MS
1525: 2014 Code of Practice.
The M&V works cost approximately RM56,000
which was higher than recommended in IPMVP,
but less than 10% of the average annual savings.
This cost can be further reduced if all Government
retrofit projects include M&V as one of the scopes
of work.
CONCLUSION
The inclusion of M&V into the retrofit project for
this project was the first for JKR. The project can
be a benchmark for other mechanical service
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Table 2: Chiller Performance Pre- vs Post-Retrofit
retrofits to follow. The results from each M&V
service retrofit can be used to build a performance
database and used as lessons learned in
mechanical design with regards to energy-
efficient design. A way forward for Government
retrofit projects is mandating the M&V scope in
Government green retrofit projects.
ACKNOWLEDGEMENT
The authors would like to thank Panaltech
Consulting Sdn Bhd for its contribution of the M&V
report for this project, and KeTTHA for the funding
of the retrofit works.
REFERENCE
[1] Efficiency Valuation Organisation (2014),
International Performance measurement and
Verification Protocol: concepts and Options
for Determining Energy and Water Savings
Volume 1, Toronto, Canada.
[2] K. J. Chua, S. K. Chou, W. M. Yang, and J.
Yan, “Achieving better energy-efficient air
conditioning – A review of technologies and
strategies,” Applied Energy, vol. 104, pp. 87-
104, 2013.