Ingenieur Vol. 75 ingenieur July 2018-FA | Page 69

Figure 5: Probe set-up for measuring the
condenser water flow rate.
Figure 6: New chiller installation in Block B
the field was the chilled water flow rate, the set-up
of which is as shown in Figure 4.
Another field-measurement parameter was
the condenser water flow rate, the set-up of which
is as shown in Figure 5.
Option B of the retrofit isolation was selected as
the M&V method. The overall chiller performance
analysis results are shown in Table 1.
Table 1: Chiller Performance Pre-Retrofit
Chiller
Power
(kW)
Block A
147.6
Block B
206.2
Efficiency
(kW/RT)
1.89
2.48
MS 1525
Requirement
(kW/RT)
0.66
Figure 7: New pumps installation in Block A
0.60
Chiller performance for both blocks A and B
was evaluated against MS 1525: 2014 Code of
Practice and it was found that the chillers used
more electrical power than necessary to produce
cooling; hence the efficiency was below what is
required by the Code of Practice.
Figure 8: New switchboard in Block A chillers.
POST-RETROFIT DATA
The new installations are identical to the old ones
in terms of chiller and pump capacities, as shown
in Figures 6 and 7.
However, the new switchboards are equipped
with digital power meters to capture data on the
chiller and pump power (kW) and energy (kWh)
consumption, as shown in Figure 8.
It is critical that savings are incurred with
regards to the overall chiller performance, and
Figure 9: Transferring data from the loggers for
analysis.
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