床上视频

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Keppel DHCS Pte Ltd

Ideas Incorporating Optimal Control and ESCO Plan in Order to Minimize the Risk of Initial Investment

The Harmonas-DEO system for monitoring and control of facilities at the Changi DCS Plant.

The Harmonas-DEO system for monitoring and control of facilities at the Changi DCS Plant.

In the past Keppel DHCS had Azbil’s Harmonas-DEO™ central monitoring and control systems installed in all of its DCS plants in Singapore with the support by Azbil Singapore Pte. Ltd. On the background that these systems have contributed to consistent operations and also maintaining the quality of cooling water of these plants, Keppel DHCS requested Azbil Singapore anew for plans to bring about energy savings in line with the road map Keppel DHCS had drawn up.

Azbil Singapore, in response, presented plans using approaches to achieve energysaving effects by adopting new technologies that enable optimal control of heat source while using existing facilities, such as chillers, cooling towers, and pumps. The presentation also included an ESCO*3床上视频 plan that guarantees energy-saving effects.

“In this scenario, we would not have to replace existing facilities with new ones, so we could hold down the initial investment. Moreover, Azbil would guarantee energy-saving effects for five years and a half thanks to the included ESCO plan. Therefore, the plan appeared to be very attractive to us in terms of minimizing risk. It sounded convincing for our parent company, Keppel Corporation, to give us an approval for the plan.” says Mr. Ng.

床上视频As a starter, Keppel DHCS implemented energy-saving measures to the Woodlands DCS plant, where upgrade of the existing facilities was kept to minimum by, for example, adding VSD (variable speed drive) units to them; and for the rest, a method of optimal control of all heat source facilities was adopted to improve the efficiency of their operations. Specifically, as an addition to the existing Harmonas-DEO system, a new utility optimization software package has been installed for optimal control of all heat source and utility facilities of the plant to meet the heat requirements of consumers and at the same time to minimize the overall electricity cost.

“At first we did not adopt for full automation of the plant operations in order to avoid risk. We were instructing operators to follow the guidance for optimal control of the facilities which is calculated by the optimization system, and there was always human intervention through the central monitoring and control system. However, as we were continuing to operate the plant with the optimization system, we have found the plant’s efficiency performance indicated by KPI*4 has increasingly been improved, which we considered to be proof of appropriate operations at all times. After that, we transited to full automation based on utility optimization calculation without human intervention. The optimal control program continuously calculates values and supports plant operations nonstop throughout the year, so we have no worries about achieving energy savings,” says Mr. Zaw.

Major functions of the utility optimization software package

Major functions of the utility optimization software package are:
1) Loading operational data from a chilled water plant through a monitoring and control system
2) Predicting the amount of heat load needed by the customer side based on historical demand and climate
床上视频 3) Controlling chillers, cooling towers, and pumps to produce predicted heat optimally so that the overall energy consumption by these facilities is minimized

床上视频* Harmonas-DEO trademarks of Azbil Corporation.

These case studies were published in the 2017 Vol.1 issue of the azbil Group's corporate magazine, azbil.

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