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. 67