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 6 68 VOL VOL 75 55 JULY-SEPTEMBER JUNE 2013 2018 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.