Lee Eng Lock - Long Term Measurement of Central Chilled Water
Transcription
Lee Eng Lock - Long Term Measurement of Central Chilled Water
SS 591 : 2013 Long Term Measurement of Central Chilled Water System Energy Efficiency Adapted for SEI/PSS 30March2015 Lee Eng Lock Co-convenor of SS 591 : 2013 Working Group Overview of SS 591 : 2013 Purpose Enable an organization to design and implement a measurement and verification (M&V) system for the long term, continuous and accurate tracking of the energy efficiency of central chilled water systems; The objectives of long term, continuous and accurate tracking of energy efficiency, important process parameters and relevant performance data of central chilled water systems are to: • Ensure correct sizing of plant components; • Facilitate proper operation, maintenance, sizing, and control of the system to improve energy efficiency, and to reduce greenhouse gas emissions and water consumption; • Allow buyers to specify energy efficiency requirements that must be met and guaranteed by suppliers, Energy Services Companies (ESCOs), contractors, and designers of equipment and systems; and • Facilitate the reporting of the performance of the chilled water system to relevant authorities. Information on this slide is confidential and strictly for use by SPRING Singapore officers only. It should not be used or referred to by third parties without prior written consent from SPRING Singapore. 2 Overview of SS 591 : 2013 Main clauses Section Content 1. General • • • Scope Normative references Definitions 2. Description of measurement and verification system • • • General (Annex A) Data points Performance metrics (Annex B) 3. Measurement and instrumentation requirements • • • Uncertainty and calibration Installation (Annex C) Instrument documents (Annex D) 4. Data handling and presentation • • • Data point naming (Annex E) Trending & storage Graphics display 5. Testing and commissioning • • • • Checks on installation Demo/ witness test Verification Training & submittals (Annex F) 6. Long term and continuous monitoring • • • Monitoring procedures Instrument service life Maintenance checklist 3 Overview of SS 591 : 2013 References ASHRAE Guideline 14:2002 Measurement of energy and demand savings IEEE 519:1992 IEEE Recommended practices and requirements for harmonic control in electrical power systems IEC 61869-2:2012 Instrument transformers - Part 2: Additional requirements for current transformers IEC 61869-3:2011 Instrument transformers - Part 3: Additional requirements for inductive voltage transformers IEC 61869-5:2011 Instrument transformers - Part 5: Additional requirements for capacitor voltage transformers IEC 62053-22:2003 Electricity metering equipment (a.c.) - Particular Requirements - Part 22: Static meters for active energy (classes 0,2 S and 0,5 S) ISO 4185:1980/Cor 1:1993 Measurement of liquid flow in closed conduits-weighing method ISO 8316:1987 Measurement of liquid flow in closed conduits- method by collection of the liquid in a volumetric tank ISO/IEC 17025:2005 General requirement for the competence of testing and calibration laboratories SS ISO 50001 : 2011 Energy management systems- Requirements with guidance for use Information on this slide is confidential and strictly for use by SPRING Singapore officers only. It should not be used or referred to by third parties without prior written consent from SPRING Singapore. 4 Overview of SS 591 : 2013 Section Two – clause 2.2 Data points • Lists the data points where measuring instruments shall be supplied and installed to monitor at 1 minute interval and trended over the entire life-cycle of the chilled water system. Minimum Requirements Temperature CHW & CDW Header return/supply temperature Flow CHW & CDW Header flow Power Group of equipment (chillers, CHW & CDW pumps and cooling towers) Weather Station Dry-bulb air temp and RH Minimally 1 set along the cooling towers Recommended Requirements Temperature CHW & CDW return/supply temperature at individual chillers Flow CHW & CDW flow at individual chillers Power Power at individual equipment Minimum requirement 5 Overview of SS 591 : 2013 Section Three – clause 3.1.2 Uncertainty under laboratory conditions • Provides the uncertainty of each measurement system as well as the overall uncertainty under laboratory conditions Measurement System (includes sensor and data acquisition system) Maximum allowable uncertainty (%) (calibration under laboratory condition) Each temperature measurement system: ±0.05⁰C. Between the supply and return of the chilled or condenser water: Temperature (0.05 C)2 (0.05 C)2 5.5 C Flow Power 100% ± 1.3 ±1 ±2 Overall maximum allowable uncertainty of the M&V system : Overall 1.32 12 22 ± 2.6 *Recommends that the calibration facilities meet the requirements of ISO/IEC 17025: 2005 6 Overview of SS 591 : 2013 Section Three – clauses 3.1.4 to 3.1.6 Requirements for each measurement system • Provides the uncertainty requirements and testing standards for each measurement system – temperature, power and flow Measurement System Important clauses Temperature Each temperature sensors shall be individually calibrated against a measurement standard with a maximum uncertainty rating of ±0.01⁰C. Flow All tests conducted to measure the uncertainty of the flow measurement system shall be in accordance with ISO 4185:1980/Cor 1:1993, ISO 8316:1987 or equivalent test standards. Type-test reports can be accepted as long as they demonstrate that the requirements in 3.1.5.3 (above) have been met. Power All tests conducted to measure the uncertainty of power meters and their associated current and voltage transformers used in the power measurement system shall be in accordance with applicable test standards, i.e. IEC 6205322:2003 for power meters, IEC 61869-2:2012 for current transformers and IEC 61869-3:2011/IEC 61869-5:2011 for voltage transformers. Equivalent test standards can also be adopted. Type-test reports can be accepted as long as they demonstrate that the requirements in 3.1.6.3 (above) have been met. 7 Overview of SS 591 : 2013 Section Three – clause 3.1.7 Data acquisition system • Provides the requirements of the data acquisition system Measurement System Important clauses The data acquisition system shall be able to record and store values up to at least 3 decimal places. Data acquisition system The memory space of the data acquisition system shall be sized for at least 36 months of storage capacity. 8 Overview of SS 591 : 2013 Section Three – Clause 3.2 Installation & set-up • Provides the minimum installation and set-up requirements for each measurement system Flow meter Temp sensors Power meters • Installed at the incoming side of the VSD Wiring • All measuring and control cables to have common screen For magnetic flow meters • Insertion types • Installed in thermowells • Test plugs before and after each temp sensor • Screens of control cables shall be connected to earthing points and from there, to the indoor earthing rings 9 Overview of SS 591 : 2013 Section Four – clause 4.2 Data point naming convention • Provides the name architecture and naming rules for the data points monitored by the BMS/EMS Description Chilled water flow rate Chilled water system Chilled water pump Chilled water return temperature Chilled water supply temperature Chiller Common header Condenser pump Condenser water flow rate Condenser water return temperature Abbreviation CHWF CHWSYS CHWP CHWRT CHWST CH HDR CDWP CDWF CDWRT Condenser water supply temperature CDWST Cooling tower CT Heat Exchanger HX Power KW Primary chilled water pump PCHWP Secondary chilled water pump SCHWP 10 Overview of SS 591 : 2013 Section Four – clause 4.3 Trending • Provides the list of data points to be trended in the BMS/EMS Minimum Requirements Clause 2.2: Data points Clause 2.3: Performance metrics CHW and CW header return/supply temperature System cooling load CHW and CW header flow Power input to groups of equipment (chillers, CHW & CDW pumps, cooling towers) Dry-bulb air temp and RH Minimally 1 set along the cooling towers Supply chilled water temp Temperature difference between chilled water supply and return Heat rejected Heat balance substantiating test COP of chilled water system Chilled water system energy efficiency Equipment energy efficiency 11 Overview of SS 591 : 2013 Section Four – clause 4.5 Graphics Display • Provides the requirements of the graphics display of the BMS/EMS Minimum Requirements • Sensor’s location and their dynamic values at 2 d.p. • Operating status of key equipment • Summary of set points • Instantaneous values of: • Total cooling load and total condenser water tonnage • Total power consumed by each group of equipment (chillers, CHW &CDW pumps and cooling towers) • System energy efficiency and COP • Equipment energy efficiency • Instantaneous and cumulative values of total electrical energy consumed by the system • System heat balance Recommended Requirements • Individual chiller energy efficiency • Consistency checks (if instrumentation are installed at individual equipment level) 12 Overview of SS 591 : 2013 Section Six – clause 6.1 Monitoring Procedures • Recommends the procedure that the owner can adopt in monitoring the performance and accuracy of the M&V system Post-installation monitoring conducted through BMS/EMS Heat balance substantiating test Multipoint consistency check Use highly accurate portable instruments In the event that any of the instruments does not tally with the verification instrument, it is recommended to replace or recalibrate the instrument. 13