University of Bath Generic Metering Specification (Rev6)

Transcription

1 University of Bath generic metering specification The University of Bath has made a major commitment to reduce energy consumption and improve the sustainability of its activities. An essential part of this strategy is to have good quality energy consumption data. Any new build and refurbishment projects must provide sufficient meters suitably designed to fully comply with CIBSE guide TM39: 2006 Building energy metering as a minimum (a requirement of Part L of the Building Regulations 2006). The principals of TM39 will also be applied to water metering at the University of Bath. Under certain circumstances the level of metering will need to be increased above the requirements of part L e.g. for departmental consumptions or financial cross charging. The requirement for extra metering should be checked at the draft proposal stage. The measurement and allocation of energy consumption will primarily be by direct measurement and calculated energy and water consumption must be avoided. Buildings using shared heating or hot water systems must be fitted with adequate heat meters designed to meet the guidance of TM 39. In all cases the energy used for heating and HWS must be separately measured by heat or gas meters whichever is the most appropriate. Water meters must be provided to measure total water usage, hot water usage and cold water usage separately. It is the intent of the University of Bath to automatically monitor all energy and water meters in both existing and future builds. Before the metering system is agreed a draft proposal shall be submitted to the University Energy Management section for approval, and will include all metering details and calculations in accordance with TM39 guidance. All new metering systems shall be supplied fully working, tested and commissioned by Elcomponent and the appointed commissioning engineers before handover to provide accurate data from the date of installation. All new meters and displays must also be clearly labelled with a suitable and durable label identifying what they are measuring and their position marked on all as fitted drawings. Technical information on all meters shall be included in the As Built Documentation, which must include C.T ratios and settings, maximum and minimum measuring rates of mechanical meters. Technical support details for the meters must also be included along with supplier s details. The designed metering strategy and energy calculations must be included in the building log book to be provided before handover of the project as stated in part L of the building regulations. This shall include designed consumptions of equipment and plant. 23/05/2014 Page 1 of 12

2 Electrical Sub Metering All metering systems must be approved and meet all current electrical legislation, and on completion must be fully tested and commissioned. Proof of commissioning and the applicable test result sheets should be available at handover and included in the building log book or directly to the energy department. The University of Bath uses the Elcomponent MeterRing system installed onsite to collect data from energy and water meters. This system is now used instead of connection to the BMS system for meter data collection. Metering installation should use class 1 EN or better multifunction meters (Elcomponent 485 compatible), installed with interconnecting RS 485 serial data transfer cabling. In main sub panels the serial cable must be wired to a point either external to the electrical panel or safely accessible when the electrical panel is fully powered up. This will facilitate future connection to the University of Bath s (UoB) Elcomponent MeterRing Automated Monitoring and Recording system (AMR). Provision must also be made to allow the safe replacement of faulty electrical meters without having to isolate the measured circuit feed. Multifunction meters acceptable for use with the UoB AMR system are; Elcomponent AEM33 either panel or DIN mounted or Elcomponent latest equivalent. Or an alternative meter approved by the University of Bath energy department. The University of Bath prefers the use of voltage type CTs over the traditional current transformers (see CT,s below). The voltage CTs are usually available at no extra cost with many installation benefits but must be matched to the correct type of AEM33 meter. kwh only meters may be used when they are the only option, such as fiscal COP meters. N.B. It is usually simpler and more cost effective to install a 485 Modbus meter than install a pulse output meter and pulse counter unit. Electricity meters without Elcomponent 485 compatibility are not acceptable. Where single electric meters are installed within a building, interconnecting serial data cables (Belden equivalent) shall be provided from each meters to a data collection point or metering outstation. This data collection point is to be agreed with the Energy Management section at the draft proposal stage, and must be within a practical distance of the University s ethernet hub. 23/05/2014 Page 2 of 12

3 Beldon equivalent serial cable must be used that meets Elcomponent metering specification (appendix 2) and installed in accordance with the wiring diagrams. Cable shielding must be maintained throughout its length and terminated at one end only. Electricity meters must be mounted in a position that it can easily and safely read by University of Bath personnel. Voltage connections from a measure circuit shall be made via a circuit breaker which is easily accessible for isolation purposes. All electricity meters must be fully commissioned with the correct CT setting matched to the size of the CTs installed. The meter must be tested in cooperation with the commissioning engineers to ensure that it is accurately working before the handover of the system. The University of Bath commissioning and test sheet must be completed and returned to the estates energy management department or included in the handover documentation. An electricity metering project specified as being part of the University s AMR system shall include the construction of a metering outstation or connection to an existing metering outstation as applicable. All electricity meters must be provided with local voltage isolation and the system must be designed that all voltages to the electricity meter are locally isolatable. Where a meter is remotely located from the measured circuit then this means of isolation will be additional to the measure circuit voltage protection. Electric meters must also have provision provided to easily shorting out the current CT circuit to enable meter replacement without isolation of the metered circuit. Current Transformers Class 1 (to EN :1999 or IEC : 1996) accuracy CTs or better must be used. Split CTs must only be used when metering existing circuits. The ratio of the CT should be matched to the design load of the circuit rather than the circuit breaker rating, to ensure accurate readings are obtained. 5 amp CTs must have a maximum secondary cable length of 5m. 1 amp CTs must be used in circumstances where 5m cable run is exceeded. Details of the CT size must be provided to the Energy Management section and all meters must be programmed to the size of the CTs. CTs must be connected in the direct the manufacturer advises and the CTs connected to the correct phase. Voltage sensing CTs with the correct meters are the preferred option by the University of Bath for sub metering systems, these have the added benefit of longer sensing distances and eliminate the need for shorting links. All electrical connections must be agreed with the Department of Estates Electrical Services Management section. 23/05/2014 Page 3 of 12

4 Gas sub metering All metering systems must be approved and meet all current gas legislation, and on completion must be fully tested and commissioned. Proof of commissioning and the applicable test result sheets should be available at handover and included in the building log book or directly to the energy department. All new gas metering installations shall have a suitable manual isolating valve fitted previous to the meter and bypass pipe work complete with suitable valves to allow easy meter removal. The design of the metering system shall be such that the accuracy of the measurement is paramount, rather than pipe sizes or position. Positioning of meters must comply with the manufactures design and meet the correct up and down stream conditions and whether the meter should be in a horizontal or vertical pipe. In the interest of Health and Safety, the gas meter must be mounted in a position that the display can be easily and safely read by University of Bath personnel standing at floor level. If this is not possible an access platform must be installed to facilitate safe manual reading. The preferred gas meter manufacturer is Elster Metering Or an alternative meter approved by the University of Bath mechanical department and energy department. Gas meters shall be provided with a pulsed output and cable, wired to an agreed data collecting point or the metering outstation. These connections are to be made through a safety barrier where required. The gas meter must be correctly sized and positioned to provide maximum accuracy. The sizing and design of the gas meter must take into account all flow rates, and must be adequate to measure any low energy consumptions under all conditions. The meter Q min must be smaller than the lowest gas consumption of the individual connected equipment; on a large gas main this will require use of specialist meters to measure a large range of flows. Despite the difficulty of installing diaphragm meters this will probably be the usual solution. Approval to connect new fiscal meters to the grid gas supply system must have been gained by the installer and a suitable approved barrier/pulse splitter i.e. a Chatterbox or equivalent relays with available extra pulsed output contacts for the use of the University of Bath AMR must be fitted if required by the gas supplier. Means of transmitting pulse data from remote fiscal gas meters to the Universities Elcomponent AMR system must be provided. 23/05/2014 Page 4 of 12

5 Technical details of the gas meter and the pulse setting values must be provided to the energy management section on completion of the installation. The technical details must include technical manuals and supplier or meter manufacturer technical department contact details. Pulse output values provided by the meter must reflect the duty and small enough to produce a continuous half hourly flow of data to maximise energy monitoring. The meter must be tested in cooperation with the commissioning engineers to ensure that it is accurately working before the handover of the system. The University of Bath commissioning and test sheet must be completed and returned to the estates energy management department or included in the handover documentation. A gas metering project specified as being part of the University s AMR system shall include the construction of a metering outstation to house AMR equipment or connection to an existing metering outstation as applicable. 23/05/2014 Page 5 of 12

6 Water sub metering All metering systems must be approved and meet all current water legislation, and on completion must be fully tested and commissioned. Proof of commissioning and the applicable test result sheets should be available at handover and included in the building log book or directly to the energy department. All new water metering installations shall have a suitable manual isolating valves fitted to allow easy meter removal. The design of the metering system shall be such that the accuracy of the measurement is paramount, rather than pipe sizes or position. Positioning of meters must comply with the manufactures design and meet the correct up and down stream conditions and whether the meter should be in a horizontal or vertical pipe. Therefore the water meter must be correctly sized and positioned to provide maximum accuracy. The sizing and design of the water meter system must take into account all flow rates, and must be adequate to measure any low flow rates. In the interest of Health and Safety, the water meter must be mounted in a position that the display can be easily and safely read by University of Bath personnel standing at floor level. If this is not possible an access platform must be installed to facilitate safe manual reading. The preferred water meter manufacturer is Elster Metering. Or an alternative meter approved by the University of Bath mechanical department and energy department. Water meters shall be provided with a pulsed output and cable, wired to an agreed data collecting point or the metering outstation. Pulse output values provided by the meter must reflect the duty and small enough to produce a continuous half hourly flow of data to maximise energy monitoring. These would normally be in the order of 1, 10 or 100 litres dependent upon the normal usage. Leakage monitoring via the AMR system must be provide on all new and modified underground pipework If the water meter is to be connected to the University s BMS system or a water control system, then an extra pair of contacts must be provided for use by the University s AMR system. Technical details of the water meter and the pulse setting values must be provided to the energy management section on completion of the installation. The technical details must include technical manuals and supplier or meter manufacturer technical department contact details. A water metering project specified as being part of the University s AMR system; shall include the construction of a metering outstation or connection to an existing metering outstation as applicable. 23/05/2014 Page 6 of 12

7 Energy sub metering All metering systems must be approved and meet all current electrical and water legislation, and on completion must be fully tested and commissioned. Proof of commissioning should be included in the building log book. In the interest of Health and Safety, the energy meter display must be mounted in a position that the display can be easily and safely read by University of Bath personnel standing at floor level. If this is not possible an access platform must be installed to facilitate safe manual reading. Where the heating or hot water of a building is supplied from a shared system such as a district heating system, Energy meters must meet the following criteria. Energy metering must also be provided to measure supplementary and renewable heating systems (e.g. solar hot water systems) to allow the efficacy of such systems to be measured. Ultrasonic Energy meters capable of directly measuring the total energy usage of a building or system as detailed below. They must be provided with separate pulsed outputs measuring heat and volume. The outputs must be wired to an agreed data collecting point or metering outstation containing the correct number of 4 mods. The preferred energy meter manufacturer for high temp 120c plus is Krohne Metering The preferred energy meter manufacturer for lower temp below 100c is Kamstrut Or an alternative meter approved by the University of Bath mechanical department and energy department The Energy meter must be correctly positioned with regard to existing or new pipe work i.e. sufficient straight pipe work up and downstream to allow maximum accuracy. The energy meter must also be correctly sized and positioned to provide maximum accuracy. The sizing and design of the energy meter must take into account all flow rates, and must be adequate to measure any low energy consumptions. Flow and return temperature probes must be mounted in pockets to facilitate easy replacement; the probes must be sized correctly for the pipe work and probes securely tightened into the pockets. The Energy meter calculator must be mounted in a position that it can easily and safely read by University of Bath personnel without the need for steps; if this is not possible a remote display must be provided. 23/05/2014 Page 7 of 12

8 An Energy metering project specified as being part of the University s AMR system shall include the construction of a metering outstation or connection to an existing metering outstation as applicable. Energy meters with shared pulse output wiring will required the addition of a separate 24 volt power supply fitted within the metering outstation. The pulse output value shall be sized to reflect the system energy, i.e. a meter measuring a solar system shall provide a pulse of 1 kwh. Technical details of the energy meter and the pulse setting values must be provided to the energy management section on completion of the installation. The technical details must include technical manuals and supplier or meter manufacturer technical department contact details. All mechanical plant connections must be agreed with the Department of Estates Engineering Services Management section. Metering Outstations (see Appendix 1) When a metering project has been specified as part of the University s AMR system, a metering outstation is required. This outstation shall be fed from a dedicated 230v supply to a switch fused spur fitted with a 2 amp fuse to provide local isolation and protection for the metering collection circuitry. The metering outstation will require an Elcomponent Ethernet gateway connected to the University s Ethernet via a patch cable and RJ45 data point. A double RJ45 10 base ethernet connection point should be provided adjacent to the metering outstation which is connected to the University of Bath Ethernet system (as agreed by the IT department). Details of the allocated data point must be provided to the energy management section. The outstation will house the required number of Elcomponent 4 mod pulse output modules needed to collect gas, energy and water meter pulses as required. The 4 mod data loggers will be connected to the gateway via a serial cable (Belden equivalent) and extended to connect to all remote electricity meters or remote 4 mod units. Cabling from the meters to outstation shall be number to allow easy identification. A generic schematic diagram for the metering outstation is shown in Appendix 1. for guidance only. The Outstation must be constructed in a suitable enclosure position to allow easy access for programming and upgrading. 23/05/2014 Page 8 of 12

9 If an outstation includes electricity meters then provision must be made to provide safe isolation of all voltages at a single point. A schematic diagram must be provided by the installer on completion showing inter-cabling between all meters and the metering outstation. Serial numbers of each 4 mod unit and associated meters must be provided as part of this diagram to allow programming of the system. Programming of the AMR system must be carried by Elcomponent and must be completed before handover of the system. Meter Network Controller (MNC) and licences Large AMR projects that have more than 25 meters being installed will require the purchasing of the appropriate number of MNC s, and the appropriate number of metering licences which are available in blocks of 25. The MNC controllers are installed on the University of Bath IT network and are physically located in a secure location in 4 West, regardless of where the rest of the AMR system is located. The installation of the MNCs will be carried out as part of the commissioning process, MNC s and licences must be available for the commissioning process to be completed. Meter Network Controllers (MNC) required per project 1-60 Meters 1 MNC Meters 2 MNC s Meters 3 MNC s Meters 4 MNC s Metering Licences required per project 1-25 meters 1 Block meters 2 Blocks meters 3 Blocks meters 4 Blocks meters 5 Blocks meters 6 Blocks meters 7 Blocks meters 8 Blocks 23/05/2014 Page 9 of 12

10 Testing and commissioning All meters installed required to be tested and fully commissioned before handover. This is to insure that the measurements are accurate and applicable to the loads being measured. Comparison must be carried out for all meters against portable calibrated meters in accordance with the project commissioning engineers. Fully completed University of Bath test sheets for each meter must be provided before handover. Final AMR commissioning will be carried out by Elcomponent engineers, before commissioning the precommissioning sheet available from Elcomponent must be completed and returned to Elcomponent. Completed copies of the Elcomponent paperwork must be included in the metering technical documentation and test sheets. Further information Energy & Environment Manager Peter Phelps on Energy Engineer Philip Auger on Electrical Services Manager Richard Hughes on Mechanical Services Manager Steve Holmes on Elcomponent on /05/2014 Page 10 of 12

11 Generic Metering Outstation schematic Appendix 1 240v Metering Outstation Data point RJ 45 Data Cable 2 Core cable to pulsed output meters switched spur Ethernet Gateway 4 Mod 4 Mod 230v Belden equivalent Serial Cable Pulsed output meter Pulsed output meter Pulsed output meter Pulsed output meter Pulsed output meter RS 485 Meter RS 485 Meter RS 485 Meter RS 485 Meter For future connection terminated safely outside the electrical enclosure 23/05/2014 Page 11 of 12

12 MeterRing Network Cable Spec (Appendix 2) Belden 8451 Equivalent Networking / Daisy Chain / Pulse single pair. Belden 8723 Equivalent Networking / Daisy Chain / Pulse 2 pair. FS Cables sell an equivalent for approx 40p per metre Belden 9841 Equivalent Networking / Daisy Chain Single pair h/duty Tel: sales@fscables.com External Cable in ducts and harsh environments etc. please contact Elcomponent for specification CT Cable 5A secondary CTs should be connected using 2.5mm Tri-rated Cable to 17th edition standards, lengths of cables depend on CT size See CT Guide Voltage output CTs should be fitted using the VT Output CT Installation guide. 23/05/2014 Page 12 of 12