Construction Manager

Name : GPDI (green property development indonesia)

Stakeholders

Investor

Asia Green Real Estate
Asia Green Real Estate is a FINMA-accredited asset manager, investing in sustainable real estate in Asian metropolises

Owner approach of sustainability

Progress: Ecoloft changes the paradigme of typical townhouse in Indonesia, though its a standardised and repeatable unit. The structure leaves plenty of flexibility to merge two units with larger floor area, even become standalone buildings. Conventional townhouses' small garden at the Ground Floor is moved in Ecoloft concept on the roof while using GF as ventilation/parking area. All construction details are state of the art and adjusted to tropical context of Indonesia.

People: The building provides high comfort levels to occupants by using thermal mass at the inside and insulating the structure consequently from the outside. Interior cooling is laid out as hybrid system; the openable double glassed windows are equipped with flexible sun shading and the interior air is conditioned and moved by high-efficient ACs and Heiku fans which leaves the choice to the occupant for natural ventilation or enforced conditioning. Water taps are 100% potable in every unit.

Planet: The team has taken high attention to a small building footprint, minimised earthwork to be optimised for land use. Materials are 95% locally sourced, energy efficiency is maximised with sunshades, thermal insolation and double glassed windows, stilt-house design and green surroundings harvest the natural ventilation and evaporative cooling. Low energy hybrid cooling technologies are selected to minimise energy consumption, as well as the solar water heater reduces power consumption from the grid. Additionally, renewable energy is produced by the PVs on the roof. The harvested rainwater is reused efficiently for toilets/ garden and permeable surfaces allowing water to percolate back to the ground. Local plants on the facades help to shade the roof garden.

Prosperity: The project was financed by a mandatory convertible bond making it attractive for longterm investors who will hold shares of the property firm once construction is completed. The project serves the the rental market with expected yields over 10% p.a.

Proficiency: Overall, the typology is the modern interpretation of traditional Indonesian stilt house. The dense land use leading to highly efficient building massing, yet privacy is carefully preserved for all the units by placing openings selectively and the use of fins for view protection. The inside is determined by airy and natural light flooded spaces, vertically flowing room continuum over 2 floors. The open floor-plan allows crossventilation and attractive interior views.

Architectural description

The Ecoloft Jababeka Golf Apartments are built on a total land area of 2000 m2. The townhouses accomodate 19 apartments with great views across the golf course. With 96m2 gross floor area, 26m2 shaded roof terrace and 33m2 covered private parking area, the units have a spacious but cozy footprint. Each townhouse is a truly eco-efficient construction and green building.

The elevated site has an east-west aspect over the longest perimeter. Drive-in access is from the north end, connecting to both the rest of the estate and the golf course, which is just 3 minutes away.

The development has a single internal green lane of water-permeable hard standing, designed to allow rain infiltration, one of the most effective means to control tropical downpours – dispersing the water instantly. Deep wells supply the entire complex with water via a filtration system.

Energy consumption

• Final Energy : 24 kWhfe/m².year
Breakdown for energy consumption :

6 kWhfe/m2.year: Cooling energy
12 kWhfe/m2.year :Home appliances
5 kWhfe/m2.year : lighting
1 kWhfe/m2.year : common amenities

• Initial consumption : 132 kWhpe/m².year

Envelope performance

More information :

Roof U Value: 2.2
Wall U Value: 2.1
Glass U Value: 5.8

Systems

Heating system :
• No heating system
Hot water system :
• Solar Thermal
Cooling system :
• VRV Syst. (Variable refrigerant Volume)
Ventilation system :
• Natural ventilation
Renewable systems :
• Solar photovoltaic
• Renewable energy production : 25 %

Water heater – Solar water heater is provided – Intisolar (IS 20 CE) or Vulcan, Rheem. vaccum tube type

GHG emissions

• GHG in use : 18 KgCO₂/m²/year
• GHG before use : 100 KgCO₂ /m²

, ie xx in use years : 5.5

Water management

• Consumption from water network : 1 758 m³

Water Consumption/m2 : 0.72

Water Consumption/Bedroom : 92.52

30 m3/unit/year: shower
16 m3/unit/year: kitchen
11 m3/unit/year: water faucets
11m3/unit/year: water closets
24 m3/unit/year: washing and cleaning
Water efficiency measures: 30.79%

The Ecoloft Jababeka Golf Apartments not only offer clean and safe water - the tap water is actually drinking quality, tested and certified by a governmental laboratory. By using reverse osmosis technology the water is pumped up from 150 m depth, filling up the water tank of each unit.

Health & Comfort

Green Building from A to Z

Ecoloft is an eco-efficient boutique residence and a green building to the core, focusing on the 3 corner stones comfort, efficiency and health.

• Efficient use of energy, water and other resources, while reducing waste (and costs) at the same time
• Protecting occupants health and improving the quality of life
• Utilization of natural materials that are locally sourced
Bamboo meets concrete  The Ecoloft Jababeka Golf Apartments are supposed to be a little oasis, so that you can feel truly at home when you are at home. The townhouses offer an elaborate construction to meet the green building requirements. All walls and roofs are insulated, and the units feature double glass airtight windows. Natural materials as well as ample green space and relaxing surroundings with various trees, flours and grassland further contribute to fresh and clean air.

Solar power production The units are equipped with solar panels that produce renewable energy during the time of natural sunlight. On top of each townhouse is a hot water tank (400 l) installed, which is filled and heated by solar water collectors. 50% of the electricity is produced by solar energy, using the photovoltaics method which converts solar energy into direct current electricity. If there is too much power available that cannot be stored, a high-tech system calculates how many A/C units in each townhouse can be turned on in order to have constantly a pleasant temperature in all rooms, free of charge. This results in 30% power savings, not to mention the environmental benefits.

High comfort through efficient cooling The lofts feature a well-though-out room concept, with recirculating air between houses as well as inside all buildings and rooms. The interior air is conditioned and moved by high-efficient AC's and Heiku fans which gives you the choice of natural ventilation or enforced air conditioning. Permanent horizonal fins and variable vertical rollerblinds with built-in sensors guarantee shading on each side of the building during any time of the day. When the sun goes down, LED lighting offers cozy illumination. Everything you need to feel comfortable at any time inside your home.

Product

Reduced Window to Wall Ratio - WWR of 16.8%
External Shading Devices - Annual Average Shading Factor (AASF) of 0.51
Insulation of Roof - U Value of 0.45
Insulation of External Walls - U Value of 0.19
Air Conditioning System - COP of 3.5
Energy-Saving Light Bulbs - Internal Spaces
Energy-Saving Light Bulbs - Common Areas and Outdoor Areas
Solar Hot Water Collectors - 50% of Hot Water Demand
Solar Photovoltaics - 25% of Total Energy Demand

Finishing work / Plumbing - Sanitary equipment

Low-Flow Showerheads - 8 lt./min
Low-Flow Faucets for Kitchen Sinks (10 lt./min) and Washbasins (6 lt/min)
Dual Flush for Water Closets - 4 lt./first flush and 3 lt./second flush

Finishing work / Partitions, insulation

External Walls: Cellular Light Weight Concrete Blocks
Internal Walls: Cellular Light Weight Concrete Blocks
Flooring: Parquet/Wood Block Finishes
Window Frames: UPVC
Wall Insulation/Roof Insulation : Polystyrene

Energy bill

• Forecasted energy bill/year : 4 965 €

Real energy cost/m2 : 2.04

Real energy cost/Bedroom : 261.32

Building Environmental Quality

• comfort (visual, olfactive, thermal)
• water management
• energy efficiency
• renewable energies

Contest

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