GM_ENRB-V3_rev1

BCA Green Mark for Existing Non-Residential Buildings Version 3.0 BCA Green Mark for Existing Non-Residential Buildings (Version 3.0) Page 1 Framework – BCA Green Mark for Existing Non-Residential Buildings (version 3.0) To achieve Green Mark Award Elective Requirement for Energy Improvement (Combination of the following items to meet 30 points) Part 1 - Energy Efficiency ENRB 1-1 Thermal Performance of Building Envelope ENRB 1-2 Air Conditioning System ENRB 1-3Natural Ventilation / Mechanical Ventilation ENRB 1-4 Artificial Lighting ENRB 1-5 Ventilation in Carparks ENRB 1-6 Ventilation in Common Areas ENRB 1-7 Lifts and Escalators ENRB 1-8 Energy Efficient Practices & Feature ENRB 1-9 Energy Policy & Management ENRB 1-10 Renewable Energy Elective Requirement for Other Areas (Combination of the following items to meet 20 points) Part 2 - Water Efficiency ENRB 2-1 Water Monitoring ENRB 2-2 Water Efficient Fittings ENRB 2-3 Alternative Water Sources ENRB 2-4 Water Efficiency Improvement Plans ENRB 2-5 Irrigation System and Landscaping ENRB 2-6 Cooling Towers Part 3 – Sustainable Operation & Management ENRB 3-1 Building Operation & Maintenance ENRB 3-2 Post Occupancy Evaluation ENRB 3-3 Waste Management ENRB 3-4 Sustainable Products ENRB 3-5 Greenery ENRB 3-6 Environmental Protection ENRB 3-7 Green Transport Part 4 - Indoor Environmental Quality ENRB 4-1 Indoor Air Quality Performance ENRB 4-2 Indoor Air Pollutants ENRB 4-3 Lighting Quality ENRB 4-4 Thermal Comfort ENRB 4-5 Internal Noise Level Part 5 – Other Green Features ENRB 5-1 Green Features & Innovations Energy Related Requirements Minimum 30 points Other Green Requirements Minimum 20 points Pre-requisite Requirement All relevant pre-requisite requirements for the specific Green Mark Rating are to be complied with BCA Green Mark for Existing Non-Residential Buildings (Version 3.0) Page 2 POINT ALLOCATION – BCA Green Mark for Existing Non-Residential Buildings (Version 3.0) Category Point Allocations (I) ENERGY EFFICIENCY M in im u m 30 po in ts to be sc o re d Part 1 – Energy Efficiency ENRB 1-1 Thermal Performance of Building Envelope 5 ENRB 1-2 Air Conditioning System (applicable to air-conditioned areas) ENRB 1-3 Natural Ventilation / Mechanical Ventilation (applicable to non air-conditioned areas excluding carparks and common areas) ENRB 1-4 Artificial Lighting 13 ENRB 1-5 Ventilation in Carparks 4 ENRB 1-6 Ventilation in Common Areas 5 ENRB 1-7 Lifts and Escalators 2 ENRB 1-8 Energy Efficient Practices & Features 12 ENRB 1-9 Energy Policy & Management 1 ENRB 1-10 Renewable Energy 15 Category Score for Part 1 – Energy Efficiency 89 (II) OTHER GREEN REQUIREMENTS M in im u m 20 po in ts to be sc o re d Part 2 - Water Efficiency ENRB 2-1 Water Monitoring 4 ENRB 2-2 Water Efficient Fittings 12 ENRB 2-3 Alternative Water Sources 3 ENRB 2-4 Water Efficiency Improvement Plans 1 ENRB 2-5 Irrigation System and Landscaping 2 ENRB 2-6 Cooling Towers 2 Category Score for Part 2 – Water Efficiency 24 Part 3 - Sustainable Operation & Management ENRB 3-1 Building Operation & Maintenance 4 ENRB 3-2 Post Occupancy Evaluation 3 ENRB 3-3 Waste Management 7 ENRB 3-4 Sustainable Products 8 ENRB 3-5 Greenery 10 ENRB 3-6 Environmental Protection 3 ENRB 3-7 Green Transport 4 Category Score for Part 3 – Sustainable Operation and Management 39 Part 4 - Indoor Environmental Quality ENRB 4-1 Indoor Air Quality Performance 8 ENRB 4-2 Indoor Air Pollutants 2 ENRB 4-3 Lighting Quality 5 ENRB 4-4 Thermal Comfort 2 ENRB 4-5 Internal Noise Level 1 Category Score for Part 4 – Indoor Environment Quality 18 Part 5 – Other Green Features ENRB 5-1 Green Features & Innovations 10 Category Score for Part 5 – Other Green Features 10 Category Score for Other Green Requirements 91 Green Mark Score 180 32 BCA Green Mark for Existing Non-Residential Buildings (Version 3.0) Page 3 Green Mark Award Rating BCA Green Mark Award Rating and Pre-requisite Requirements Green Mark Score Green Mark Rating 90 and above Green Mark Platinum 85 to <90 Green Mark GoldPlus 75 to <85 Green Mark Gold 50 to <75 Green Mark Certified Pre-requisite Requirements for Existing Non-residential Building Criteria PART 1 - ENERGY EFFICIENCY 1. ENERGY EFFICIENCY Green Mark Rating Minimum points achievement from Part 1 – Energy Efficiency Green Mark Certified 30 points Green Mark Gold 35 points Green mark GoldPlus 40 points Green Mark Platinum 45 points 2. MINIMUM SYSTEMS’ EFFICIENCY Minimum Design System Efficiency/Operating System Efficiency (DSE/OSE) (i) For buildings using Water-Cooled Chilled-Water Plant Green Mark Rating Building Cooling Load (RT) < 500 ≥ 500 Efficiency (kW/RT) Certified 0.85 0.75 Gold 0.80 0.70 GoldPlus 0.75 0.68 Platinum 0.70 0.65 (ii) For Buildings using Air Cooled Chilled-water Plant or Unitary Air-Conditioner Green Mark Rating Building Cooling Load (RT) < 500 ≥ 500 Efficiency (kW/RT) Certified 1.1 1.0 Gold 1.0 Not applicable GoldPlus 0.85 Platinum 0.78 For building with building cooling load of more than 500 RT, the use of air cooled central chilled-water plant or other unitary air-conditioners are not applicable for Gold and higher ratings. Note: The performance of the overall air-conditioning system for the building is based on the Operating System Efficiency (OSE) of the system during the normal building operating hours as defined below: Office Building: Monday to Friday: 9am to 6pm Retail Mall: Monday to Sunday: 10am to 9pm Institutional: Monday to Friday: 9am to 5pm Hotel and Hospital: 24-hour Industrial and Other Building Types: To be determined based on the operating hours BCA Green Mark for Existing Non-Residential Buildings (Version 3.0) Page 4 3. CHILLER PLANT M&V INSTRUMENTATION (i) Provision of permanent measuring instruments for monitoring of water-cooled chilled-water system and air-cooled chilled water system operating system efficiency. The installed instrumentation shall have the capability to calculate resultant plant operating system efficiency (i.e. kW/RT) within 5% of its true value and in accordance with ASHRAE Guide 22 and AHRI 550/590. Heat balance test for water-cooled chilled- water system is required for verification of the accuracy of the M&V instrumentation. 4. NATURAL VENTILATION AREA (only applicable to occupied areas, excluding circulation, plant rooms and transit areas ): Pre requisite requirement for Platinum - At least 75% of natural ventilated areas with effective cross ventilation with North and South facing window opening PART 4 - INDOOR ENVIRONMENTAL QUALITY 1. IAQ Audit - to conduct an full IAQ audit three yearly that complies with NEA’s Guidelines for Good Indoor Air Quality in Office Premises or SS554:2009 Code of Practice for `Indoor air quality for air-conditioned buildings' [4 points] [ENRB 4-1(a)] BCA Green Mark for Existing Non-Residential Buildings (Version 3.0) Page 5 Energy Related Requirements Part 1 - Energy Efficiency Green Mark Points ENRB 1-1 Thermal Performance of Building Envelope Enhance the overall thermal performance of building envelope to minimize heat gain thus reducing the overall cooling load requirement. 0.5 points for every reduction of 1 W/m2 in ETTV from the baseline of 50 W/m2 Point scored = 0.5 x (50 – ETTV) (Up to 5 points) ENRB 1-2 Air-Conditioning System Applicable to Air-conditioned Building Areas (with an aggregate air- conditioned areas > 500m2) Encourage the use of better efficiency air-conditioned equipment to minimize the energy consumption. (System efficiency in kW/ton) (a) Water-Cooled Chilled-Water Plant: a) Water-Cooled Chiller b) Chilled water pump c) Condenser water pump d) Cooling tower Baseline Building Cooling Load < 500 RT ≥500 RT Pre-requisite Requirements Minimum system efficiency of central chilled-water plant 0.85 kW/RT 0.75 kW/RT OR (b) Air Cooled Chilled-Water Plant / Unitary Air- Conditioners: Air cooled Chilled-Water Plant: � Air-Cooled Chiller � Chilled Water Pump Unitary Air-Conditioners: � Variable Refrigerant Flow (VRF) System � Water-Cooled Package Unit � Single-Spilt Unit � Multi-Spilt Unit (a) Water-Cooled Chilled-Water Plant Building cooling load ≥ 500RT 14 points for achieving plant efficiency of 0.75 kW/ton 0.35 point for every percentage improvement in the chiller plant efficiency better than 0.75 kW/ton Point scored = 0.35 x (% improvement) Building cooling load < 500RT 14 points for achieving plant efficiency of 0.85 kW/ton 0.3 point for every percentage improvement in the chiller plant efficiency better than 0.85 kW/ton Point scored = 0.3 x (% improvement) (Up to 20 points) OR (b) Air-Cooled Chilled-Water Plant/Unitary Air Conditioners Building cooling load ≥ 500RT 14 points for achieving plant efficiency of 1.0 kW/ton 0.25 point for every percentage improvement in the chiller plant efficiency better than 1.0 kW/ton Point scored = 0.25 x (% improvement) BCA Green Mark for Existing Non-Residential Buildings (Version 3.0) Page 6 Baseline Building Cooling Load < 500 RT ≥500 RT Pre-requisite Requirements Minimum system efficiency of air cooled chilled water plant or unitary conditioners 1.1 kW/RT 1.0 kW/RT Note: Where there is a combination of centralised air-con system with unitary air-conditioned system, the computation for the points scored will only be based on the air-conditioning system with a larger aggregate capacity. (c) Air Distribution system: • Air Handling Units (AHUs) • Fan Coil Units (FCUs) Baseline – Fan power limitation in air conditioning system Allowable nameplate motor power Constant volume Variable volume 0.47 W/CMH 0.74 W/CMH Note: For buildings using district cooling system, there is no need to compute the plant efficiency under Part 1-2 (a) and (b). The points obtained will be pro-rated based on the air distribution system efficiency under Part 1-2(c) (d) Prerequisite requirements : Provision of permanent measuring instruments for monitoring of water- cooled chilled-water plant and air-cooled chilled- water plant efficiency. The installed instrumentation shall have the capability to calculate a resultant plant efficiency (i.e. kW/RT) within 5% of its true value and in accordance with ASHRAE Guide 22 and AHRI 550/590. The following instrumentation and installation are also required to be complied with: • Location and installation of the measuring devices to meet the manufacturer’s recommendation. • Data acquisition system to have a minimum resolution of 16 bit. • All data logging with capability to trend at 1 minute sampling time interval. • Dedicated digital power meters shall be provided for the following groups of equipment: chiller(s), chilled water pump(s), condenser water pump(s) and cooling tower(s). • Flow meters to be provided for chilled-water and condenser water loop and shall be of ultrasonic / full bore magnetic type or equivalent. • Temperature sensors are to be provided for chilled water and condenser water loop and shall have an end-to-end measurement uncertainty not exceeding ± 0.05 °C over entire measurement or calibration range. All thermo- Building cooling load < 500RT 14 points for achieving plant efficiency of 1.1 kW/ton 0.2 point for every percentage improvement in the chiller plant efficiency better than 1.1 kW/ton Point scored = 0.2 x (% improvement) (Up to 20 points) (c) Air Distribution System 0.15 Point for every percentage improvement in the air distribution system efficiency over the baseline Point scored = 0.15 x (% improvement) (Up to 8 points) 1 point BCA Green Mark for Existing Non-Residential Buildings (Version 3.0) Page 7 wells shall be installed in a manner that ensures that the sensors can be in direct contact with fluid flow. Provisions shall be made for each temperature measurement location to have two spare thermo-wells located at both side of the temperature sensor for verification of measurement accuracy. (e) Prerequisite requirements : Verification of central water cooled chilled-water plant instrumentation: Heat Balance – substantiating test for water cooled chilled-water plant to be computed in accordance with AHRI 550/590. The operating system efficiency and heat balance to be submitted to BCA upon commissioning. (f) Provision of variable speed controls for chiller plant equipment such as chilled-water pumps and cooling tower fans to ensure better part-load plant efficiency. (g) Sensors or similar automatic control devices are used to regulate outdoor air flow rate to maintain the concentration of carbon dioxide. Carbon dioxide acceptable range ≤ 700 ppm above outdoor 1 point 1 point 1 point ENRB 1-3 Natural Ventilation / Mechanical Ventilation Applicable to Non Air-Conditioned Building Areas (with an aggregate non air-conditioned areas > 10% of total floor area excluding carparks and common areas) (a) Natural Ventilation (only applicable to occupied areas, excluding circulation, plant rooms and transit areas) Encourage building that facilitates good natural ventilation. Proper design of building layout that utilises prevailing wind conditions to achieve adequate cross ventilation. (b) Mechanical Ventilation Encourage energy efficient mechanical ventilation system as the preferred ventilation mode to air- conditioning in buildings. Baseline: Fan power limitation I mechanical ventilation systems: Allowable nameplate motor power Constant volume Variable volume 0.47 W/CMH 0.74 W/CMH Note : Where there is a combination of naturally ventilated and mechanical ventilated spaces, the points scored will only be based on the predominant ventilation modes of normally occupied spaces. 20 based points will be awarded for use of natural ventilation 1.6 points for every 10% of NV areas with window openings facing north and south directions and cross ventilation (Up to 32 points) 0.6 point for every subsequent 1% improvement from the baseline (Up to 32 points) BCA Green Mark for Existing Non-Residential Buildings (Version 3.0) Page 8 ENRB 1-4 Artificial Lighting Encourage the use of energy efficient lighting to minimize energy consumption from lighting usage while maintaining proper lighting level. Please refer to the Annex 1 for the baselines of lighting power budget 0.3 point for every percentage improvement in lighting power budget Point scored = 0.3 x (% improvement) (Up to 13 points) Excluding tenant lighting provision – Up to 5 points) ENRB 1-5 Ventilation in Carparks Encourage the use of energy efficient design and control of ventilation systems in carparks. (a) Carparks designed with natural ventilation. (b) CO sensors are used to regulate the demand for mechanical ventilation (MV) Note: Where there is a combination of different ventilation mode adopted for carpark design, the points obtained will be prorated accordingly. Naturally ventilated carparks – 4 points Points scored based on the mode of mechanical ventilation provided Fume extract – 2.5 points MV with or without supply – 2 points (Up to 4 points) ENRB 1-6 Ventilation in Common Areas Encourage the use of energy efficient of ventilation systems in the following common areas: (a) Toilets (b) Staircases (c) Corridors (d) Lift lobbies (e) Atrium Extent of Coverage: At least 90% of each applicable area Point scored based on the mode of ventilation provided in the applicable areas Natural ventilation – 1.5 points for each area Mechanical ventilation – 0.5 point for each area (Up to 5 points) ENRB 1-7 Lifts and Escalators Encourage the use of energy efficient lifts and escalators. Lifts and/or escalators with AC variable voltage and variable frequency (VVVF) motor drive and sleep mode features. Extent of Coverage: All lifts and escalators Lifts – 1 point Escalators- 1 point ENRB 1-8 Energy Efficient Practices & Features Encourage the use of energy efficient practices and features which are innovative and/or have positive environmental impact. (a) Computation of the energy consumption in the form of energy efficiency index (EEI) (b) Use of energy efficiency product that are certified by approved local certification body (c) Use of energy efficient features Example: 1 point 0.5 point for each equipment type (Up to 2 points) 2 points for every 1% energy saving over the total building energy consumption (Up to 9 points ) BCA Green Mark for Existing Non-Residential Buildings (Version 3.0) Page 9 • Re-generative lift • Heat recovery system • Motion sensors • Sun pipes • Light shelves • Photocell sensors to maximize the use of daylight • Heat pumps, etc. ENRB 1-9 Energy Policy and Management (a) Energy policy, energy targets and regular review with top management’s commitment as part of an environmental strategy (b) To show intent, measures and implementation strategies of energy efficiency improvement plans to achieve energy target set over the next three years. Committed energy savings accrued from proposed measures should be quantified. 0.5 point 0.5 point ENRB 1-10 Renewable Energy Encourage the application of renewable energy sources in buildings. Point scored based on the expected energy efficiency index (EEI) and % replacement of electricity by renewable energy source Energy Efficiency Index (EEI) Every 1% replacement of electricity (based on total electricity consumption) by renewable energy source Include tenant’s usage Exclude tenant’s usage ≥ 50 kWh/m²/yr 5 points 3 points < 50 kWh/m²/yr 3 points 1.5 points (Up to 15 points) PART 1 – ENERGY EFFICIENCY CATEGORY SCORE: (Part 1-2) X Air-conditioned Building Floor Area Total Floor Area + (Part 1-3) X Non Air-Conditioned Building Floor Area Total Floor Area + (Part 1-1, Part 1-4 to Part 1-10) Where Part 1-2 = Total Green Mark Points obtained under Part 1-2 Part 1-3 = Total Green Mark Points obtained under Part 1-3 Part 1-1, Part 1-4 to Part 1-10 = Total Green Mark Points obtained under Part 1-1, Part 1-4 to Part 1-10 BCA Green Mark for Existing Non-Residential Buildings (Version 3.0) Page 10 BCA Green Mark for Existing Non-Residential Buildings (Version 3.0) Page 11 Other Green Requirements Part 2 - Water Efficiency Green Mark Points ENRB 2-1 Water Monitoring Provide private-metering and leak detection system for better control and monitoring. (a) To m