Office Building - Vietnam

basic design approach forEnergy

andEnvironment

forLOTUS 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 associatedarchitectural componentsThe 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

1.2 Building Layout Rendering – cont

1.2 Building Layout Rendering – cont

1.2 Building Layout Rendering – cont

1.3 Life Cycle CostingA major impact on life cycle costing will be the ElectricalTariff and what tariff classification will be applied and if the building is under “Commercial” or “Administrative”tariff.

administrativecommercial

Max0.163100Max0.061135Min0.05940Min0.04835

RangeUSDVMDkW/h

2. Credits Categories addressed

E: EnergyW: WaterECO: EcologyWP: Waste & PollutionH: Health & ComfortA: Adaptation & Mitigation

2.1 “E” Credit targets

Total Building Energy UseE-1: Building EnvelopeE-3: HVAC COPE-9: Innovation

2.2 “W” Credits targets

W-7: HVAC Water Use

2.3 “ECO” Credit targets

ECO-6: Green Roof

2.4 “WP” Credit targets

WP-2: AC System Refrigerants

2.5 “H” Credit targets

H2: LightingH3: External/Atrium ViewsH4: Thermal ComfortH5: Noise

2.6 “A” Credit targets

A-4 Renewable EnergyA-5: Innovation

3. HVAC Design Approach OverviewUFAD with Primary AHU on RoofAHU 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 DesignSeparate fresh air dehumidification

3. HVAC Design Approach OverviewPrimary AHU

Dehumidification Cooling

1 2

Energyrecovery

Primary AHU on Roof

3.1 Design Approach E-1

Building EnvelopeRelated credits

Total Building Energy UseE-2 Envelope OTTVH-2 (day) lighting

3.1 Design Approach E-1

East-West Side Up to 50% Electro-chromic Windows

SHGC (tinted): 0.09U-Value: 1.6 w/m2 KVT: 62%

3.1 Design Approach E-1South Side (up to 50% glazing)

2/3 BIPV Modules with Semitransparent Amorphous Silicon Thin FilmSHGC: 0.1U-Value: 1.2

1/3 Low-E glass with a transparent, color-neutral appearanceSHGC: 0.27U-Value: 1.5 w/m2 KVT: 64%

3.1 Design Approach E-1North Side

Up to 50% Low-E glass with a transparent, color-neutral appearance

SHGC: 0.4U-Value: 1.9 w/m2 KVT: 68 %

3.1 Design Approach E-1Roof (Atrium) 9 x 9 m

Glass panels on the skylight have computer-controlled motors to change the position of the panelsfor light-control

SHGC: 0.27U-Value: 1.5 w/m2 K

3.1 Design Approach E-1Roof (Extensive Type)

Green Roof U-Value: 0.2 w/m2 K

3.1 Design Approach E-1Next Steps

OTTV calculation to arrive at the best cost consideringDaylight compliance10% Renewable energy requirement

3.2 Design Approach E-3HVAC 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 guidelinesExemption 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-3HVAC COP

Chillers with VFDCOP: 7 to 15Condenser water reset

15.85 50%

10.44 100%Part Load

20 CCondenser entering water

14 CChilled Water Leaving

12.77 50%

9.91 100%Part Load

24 CCondenser entering water

14 CChilled Water Leaving

9.69 50%

8.28 100%Part Load

28 CCondenser entering water

14 CChilled Water Leaving

7.69 50%

7.01 100%Part Load

32 CCondenser entering water

14 CChilled Water Leaving

COPPart Load Selection

3.2 Design Approach E-3HVAC COP

Vane Axial Fans with VFD @ 85% minVariable Primary PumpingPremium Efficiency Motors

3.2 Design Approach E-3HVAC COP

Cooling Tower with VFD

3.3 Approach E-9Innovation

PotentialsDual temperature chilled water design

3.4 Design Approach W-7

HVAC Water UseRelated 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 guidelinesExemption 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-7orA cooling tower that utilizes rainwater and does not create aerosols (water drops in the discharge air from the cooling tower)

3.4 Approach W-9InnovationA 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-7Green Roof

Related creditsA-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-1Indoor Air Quality

Related pre-requisitesTotal Building Energy Use

ApproachIncrease ASHRAE ventilation rates by 30% (to approx 40 m3/h)Provide total energy recovery from exhaust

3.8 Design Approach H-2

(day) LightingRelated creditsE-1: Envelope

ApproachGlazing (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 building's 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-2Interior Partitions

Montage panels fitted with fluted glass make natural daylight accessible to more than 90% of employees.

3.8 Design Approach H-2Interior Partitions – Conference Rooms

E Glass™ panels mounted in hollow frame extrusions to visually and audibly isolate the conference rooms from the lobby or perimeter

3.8 Design Approach H-2Atrium (alternative)

Electro-chromic glazing (same as E-W Façade)

3.9 Design Approach H-3

External/Atrium ViewsNo issue with 45 x 27 m floor plate and 9 x 9 m Atrium at the center

3.10 Design Approach H-4Thermal ComfortApproach

Individual thermal Control by UFAD (manual or AUTO)Low Mixing Interior outlets, Horizontal Flow = 10 PDD @ 0.6 mPerimeter Linear

3.11 Design Approach H-5

NoiseApproach

- 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 EnergyRelated credits

ECO-6 Green Roof and 80% requirement for LOTUS 3

3.12 Design Approach A-4Mitigation & Renewable Energy

OPTION 1Solar Powered Absorption Chiller for 2nd stage fresh air coolingThis option has minor impact on Green RoofOptional for Domestic Hot Water

3.12 Design Approach A-4Mitigation & Renewable Energy

OPTION 2Concentrated Solar Power This option has a smaller footprint than conventional flat solarpanels

3.12 Design Approach A-4Mitigation & 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-4Mitigation & Renewable Energy

Next stepsDaylight simulation to qualify south façade optionCalculation of percentage of renewable energy in relation to total energy consumption with south façade in combination with either optionExplore possibilities for Energy Contracting for CSP (Option 2)Life Cycle CalculationsAssociated cost study (Structural etc0

3.12 Approach A-5Innovation

PotentialsSame as E-9

Thank You for your Attention