Energy Mapping. A Concept for Cost Beneficial Reduction of Energy Costs in the Water Sector. March 2010

Transcription

1 Energy Mapping A Concept for Cost Beneficial Reduction of Energy Costs in the Water Sector March 2010 DanAqua Sdn Bhd 7-01, Block B, Phileo Damansara 2 No 15, Jalan 16/ Petaling Jaya Selangor, Malaysia Tel.: Fax:

2 Contents 1 What is Energy Mapping? Feasibility Study (Phase1) Phase 2: Detailed study Phase Phase 3: Design Phase Phase 4: Implementation Phase References... 7

3 1 What is Energy Mapping? Energy is typically the highest economic burden in a water utility (50-60% of total operation costs) Energy costs for water production/distribution can typically be reduced by 12 30% by optimising the existing system. Electricity costs in Malaysia have increased with 33% during the last 4 years. Developement in Electricity Tariff 150% 140% 130% 120% 110% 100% 90% 80% Energy Mapping is a concept, where the cost beneficial areas for energy savings can be identified in a structured manner by dividing the task into phases, after witch a go/no go decision can be made. During the investigation, Data Loggers and other specialised equipment is used for obtaining the measurements necessary. Energy Mapping can be performed on all energy consuming processes in water Utilities. As such it is not limited to huge installations. It will usually cover either: 1. Water Treatment Plants (Discharge pump units, aerator compressors) 2. Water/Waste water pumping stations (Pumps, pump controls) Typically, the reasons for low energy efficiency are: Mismatched Pumps On/off Operation = Friction Loss Pumping regardless of Inlet Pressure Fixed Discharge Pressure Inadequate Pipe Size/Throttle Regulation Low Efficiency Pumps/Motors Low Aeration Efficiency Page 1

4 The Energy Mapping is divided into phases in order to focus on the devices, where considerable energy reductions can be made. The two first phases consist of a feasibility study and a detailed study. The energy consuming devices are divided into three groups: Red, yellow and green in order to visualize the efficiency of the device. This is done by means of an efficiency Meter during the feasibility study. EFFICIENCY METER Green devices are not pursued during the detailed study, since there are no or very little to gain. Only the red and the highest consuming devices within the yellow group will be part of the detailed study. Feasibility studies are normally free of charge, depending on the number/types of locations and whether the on-site duration can be kept low. If the sites are situated far away from Kuala Lumpur, the client must be willing to reimburse DanAqua for transportation costs and hotel accommodation. If the client decides to continue to the following phases, charges will be made according to our standard fees based on lump sum or on an hourly rate. An Energy Mapping program usually consists of at least one of the phases described in following sections. Page 2

5 2 Feasibility Study (Phase1) An assessment is made in order to determine whether there are any possibilities for cost beneficial measures to reduce the energy costs in the system and to identify those. During phase 1, the following is carried out: An Asset Registration with a comprehensive list of data for the relevant components and sub-components. A measurement of the pump efficiency on all major energy consuming devices in the system. General registration of the process system or network connected to the energy consuming devices. Compilation of consumption and billing data The client must assist with: One person in order to make short duration changes in the operation of the pumps or other devices. A tapping point for our pressure measurement loggers before and after pumps If such tapping points does not exist before the pumps, other means of measuring inlet pressure must be available (for example water level in tanks) Electricity billing information and tariff structure for at least 6 months. Data sheets and original pump curves, if available. Information of levels & diameters of reservoirs General network structure downstream of pumps Historical flow & pressure data, if available. Report After the study, a brief report will be made of the findings. The report will include estimated potential savings based on the simple pay back method and an estimated BOQ based on lump-sums for investments (if applicable) This report should be seen as an indicator/estimation of whether any potential for energy reduction exists and should be conducted for all relevant electrical installations in the network as mentioned in the first section. Page 3

6 3 Phase 2: Detailed study Phase If the client decides to move forward, based on the report generated under phase 1, a detailed mapping has to be carried out to get the precise costeffectiveness. Depending on the system, this could involve: Connection of Data loggers to the energy consuming devices and generation of time series of data. If data is not available, possibly a survey of the GPS-positions for crucial components (x,y,z) Measuring the full pump curve on relevant pumps. Investigation of consequences for expected future expansions in the system. Chemical analysis of process water (only applicable for aeration) Calculations of the potential savings based on the detailed study. Detailed price investigation for any components to be installed (if applicable) Life Cycle Cost and Cost Benefit cost calculations. Page 4

7 4 Phase 3: Design Phase If the client decides to move forward, based on the report generated under phase 2, the changes in the system has to be described to such a detail that it can be tendered. In some cases this phase only involves specifications of a few components, but in more complex solutions, this could involve: Process & Instrumentation description Process & Instrumentation diagrams. Cable diagrams Detailed BOQ CAD-Drawings of mechanical systems (if applicable) Component recommendations. Assistance in Tender Evaluation Page 5

8 5 Phase 4: Implementation Phase If the client decides so, we can be of assistance in the implementation phase also. Not only during site supervision, commissioning and training of operators: DanAqua can facilitate in the financing of the project, if it can comply with the Danish EKF 1 requirements for Energy Contracting Projects and/or through contribution through CDM 2 Project status. 1 The Danish Export Credit Foundation supports CO2-reduction projects in the form of Energy & Water saving Projects. This is done by issuing credit guarantees for banks to finance the investments, if the savings are able to pay back the investments over a reasonable period of time. 2 The Clean Development Mechanism (CDM) is an arrangement under the Kyoto Protocol allowing industrialised countries with a greenhouse gas reduction commitment to invest in ventures that reduce emissions in developing countries as an alternative to more expensive emission reductions in their own countries. It typically requires big reduction in a single project or pooling of reductions from several smaller projects to be feasible. Page 6

9 6 References /1/ LAKU Management: Pumping stations at Ph. 3 & 4 at Lambir WTP (Miri) /2/ Taliworks Corporation: Pump Optimisation on Sg. Baru & Penarak Pumping Stations (Langkawi) /3/ PT Suptracto: Pump Optimisation on Samudera WTP (Java) /4/ Perbadanen Bekaian Air (PBA): Energy efficient controls for small boosters at Bukit Jambul (Penang) /5/ AKSB: Energy & Process on Tanjung Mas Ground Water Treatment Plant (Kelantan) /6/ CMWSSB, Pump Optimisation for Ground Water Supply to Chennai. /7/ LAP: Energy Efficient Rural Water Supply for 9 villages near Lenggong (Perak) /8/ AETRA: Pump & process optimisation on 450 MLD Bouran WTP (Jakarta) /9/ AKSB: Energy reduction on Merbau Chundung Raw Water Intake and Water Treatment Plant (Kelantan) /10/ LAP: Energy reduction on Teluk Kepayang WTP & Manjung Booster (Perak) Page 7