Office Building - Vietnam basic design approach for Energy and Environment for LOTUS 3 Certification
1. Introduction A design approach for a speculative office building to optimize the credit viability for LOTUS 3 on key credits related to MEP and associated architectural components The design approach also addresses the complexity between various credits.
1.1 Building Layout approach The floor plate has been developed on basis of “External/Atrium View” with no more than 9 meters from any location to either window or atrium view. 6-Storey Building
1.3 Life Cycle Costing A major impact on life cycle kW/h costing will be the Electrical VMD USD Range Tariff and what tariff 835 0.04 Min classification will be applied and 940 0.05 Min if the building is under 1135 0.06 Max 3100 0.16 Max “Commercial” or “Administrative” tariff. commercial administrative
2. Credits Categories addressed E: Energy W: Water ECO: Ecology WP: Waste & Pollution H: Health & Comfort A: Adaptation & Mitigation
2.1 “E” Credit targets Total Building Energy Use E-1: Building Envelope E-3: HVAC COP E-9: Innovation
2.6 “A” Credit targets A-4 Renewable Energy A-5: Innovation
3. HVAC Design Approach Overview UFAD with Primary AHU on Roof AHU with Total Energy Wheel (Sensible & Latent) High Temperature Chilled Water for Sensible and 1st Stage Fresh Air Cooling (14 C) Low Temperature Chilled Water for 2nd Stage Fresh Air Cooling (6 C) 10 C Dew Point Design Separate fresh air dehumidification
3. HVAC Design Approach Overview Primary AHU Primary AHU CoolingRoof on Dehumidification 1 2 Energy recovery
3.1 Design Approach E-1 Building Envelope Related credits Total Building Energy Use E-2 Envelope OTTV H-2 (day) lighting
3.1 Design Approach E-1 East-West Side Up to 50% Electro-chromic Windows SHGC (tinted): 0.09 U-Value: 1.6 w/m2 K VT: 62%
3.1 Design Approach E-1South Side (up to 50% glazing) 2/3 BIPV Modules with Semitransparent Amorphous Silicon Thin Film SHGC: 0.1 U-Value: 1.2 1/3 Low-E glass with a transparent, color-neutral appearance SHGC: 0.27 U-Value: 1.5 w/m2 K VT: 64%
3.1 Design Approach E-1 North Side Up to 50% Low-E glass with a transparent, color-neutral appearance SHGC: 0.4 U-Value: 1.9 w/m2 K VT: 68 %
3.1 Design Approach E-1 Roof (Atrium) 9 x 9 m Glass panels on the skylight have computer-controlled motors to change the position of the panels for light-control SHGC: 0.27 U-Value: 1.5 w/m2 K
3.1 Design Approach E-1 Roof (Extensive Type) Green Roof U-Value: 0.2 w/m2 K
3.1 Design Approach E-1 Next Steps OTTV calculation to arrive at the best cost considering Daylight compliance 10% Renewable energy requirement
3.2 Design Approach E-3 HVAC COP Related credits Total Building Energy Use (low COP of Air-Cooled Chillers) W-7: HVAC Water Use (restriction on water cooled chillers) Recommended Modification to LOTUS-3 guidelines Exemption to Water Cooled Chillers if design is high temperature and minimum IPLV of XX and in conjunction with Renewable Energy Chillers of 25% minimum peak load.
3.2 Design Approach E-3 Part Load Selection COPHVAC COP Chilled Water Leaving 14 C Condenser entering water 32 C Chillers with VFD 100% 7.01 Part Load COP: 7 to 15 50% 7.69 Chilled Water Leaving 14 C Condenser water Condenser entering water 28 C reset 100% 8.28 Part Load 50% 9.69 Chilled Water Leaving 14 C Condenser entering water 24 C 100% 9.91 Part Load 50% 12.77 Chilled Water Leaving 14 C Condenser entering water 20 C 100% 10.44 Part Load 50% 15.85
3.2 Design Approach E-3HVAC COP Vane Axial Fans with VFD @ 85% min Variable Primary Pumping Premium Efficiency Motors
3.2 Design Approach E-3HVAC COP Cooling Tower with VFD
3.3 Approach E-9Innovation Potentials Dual temperature chilled water design
3.4 Design Approach W-7 HVAC Water Use Related credits Total Building Energy Use (low COP of Air-Cooled Chillers) E-3: HVAC COP (restriction on water cooled chillers) Recommended Modification to LOTUS-3 guidelines Exemption to Water Cooled Chillers if design is high temperature and minimum IPLV of 0.4 and in conjunction with Renewable Energy Chillers of 25% minimum peak load.
3.4 Design Approach W-7 or A cooling tower that utilizes rainwater and does not create aerosols (water drops in the discharge air from the cooling tower)
3.4 Approach W-9 Innovation A cooling tower that utilizes rainwater and does not create aerosols (water drops in the discharge air from the cooling tower). See W-7
3.5 Design Approach ECO-7 Green Roof Related credits A-4 Renewable Energy (space for solar panels)
3.6 Design Approach WP-2 AC System Refrigerants Related credits Total Building Energy Use (low COP of Air-Cooled Chillers) E-3: HVAC COP (restriction on water cooled chillers) Exemption based on LEED Equation to Water Cooled Chillers if design is high temperature and minimum IPLV of 0.4 and in conjunction with Renewable Energy Chillers of 25% minimum peak load.
3.7 Design Approach H-1 Indoor Air Quality Related pre-requisites Total Building Energy Use Approach Increase ASHRAE ventilation rates by 30% (to approx 40 m3/h) Provide total energy recovery from exhaust
3.8 Design Approach H-2 (day) Lighting Related credits E-1: Envelope Approach Glazing (see section E-1)
3.8 Design Approach H-2Atrium The light is reflected from the moving heliostats to an array of stationary mirrors above the buildings skylight.
3.8 Design Approach H-2Atrium Prismatic tiles reflect light and distribute bursts of color throughout the atrium. The indoor space has a "light wall" of reflective metal in the atrium and reflective coatings on the ceilings near windows.
3.8 Design Approach H-2 Interior Partitions Montage panels fitted with fluted glass make natural daylight accessible to more than 90% of employees.
3.8 Design Approach H-2 Interior Partitions – Conference Rooms E Glass™ panels mounted in hollow frame extrusions to visually and audibly isolate the conference rooms from the lobby or perimeter
3.9 Design Approach H-3 External/Atrium Views No issue with 45 x 27 m floor plate and 9 x 9 m Atrium at the center
3.10 Design Approach H-4 Thermal Comfort Approach Individual thermal Control by UFAD (manual or AUTO) Low Mixing Interior outlets, Horizontal Flow = 10 PDD @ 0.6 m Perimeter Linear
3.11 Design Approach H-5 Noise Approach - Envelope - No sound creating components (fans/pumps etc) in building - Proper duct design (sizing, sound attenuation/regeneration) - Interior Design
3.12 Design Approach A-4 Mitigation & Renewable Energy Related credits ECO-6 Green Roof and 80% requirement for LOTUS 3
3.12 Design Approach A-4 Mitigation & Renewable Energy OPTION 1 Solar Powered Absorption Chiller for 2nd stage fresh air cooling This option has minor impact on Green Roof Optional for Domestic Hot Water
3.12 Design Approach A-4 Mitigation & Renewable Energy OPTION 2 Concentrated Solar Power This option has a smaller footprint than conventional flat solar panels
3.12 Design Approach A-4 Mitigation & Renewable Energy In combination with Option 1 or Option 2 (see also south facade section). Nominal Power 40W/m2. Optional opaque laminates if needed to get to 10% minimum under LOTUS-3.
3.12 Design Approach A-4 Mitigation & Renewable Energy Next steps Daylight simulation to qualify south façade option Calculation of percentage of renewable energy in relation to total energy consumption with south façade in combination with either option Explore possibilities for Energy Contracting for CSP (Option 2) Life Cycle Calculations Associated cost study (Structural etc0
3.12 Approach A-5Innovation Potentials Same as E-9