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Pringapus 6&7, PT-Ungaran Sari Garments (PA6&7)
Semarang, Indonesia

Summary

Location Semarang, Indonesia
Coordinates 7°S, 110°N
Occupancy Type Manufacturing
Typology New Construction
Climate Type Tropical Monsoon
Project Area 17,425 m2
Date of Completion 2018
Grid Connectivity Grid-connected
EPI 103 kWh/m2/yr
Architect NC Design & Associates, Bali
MEP & Architect of record PT Cipta Prima Sejahtera, Java Tengah, Indonesia
Energy Consultants EDS Pvt Ltd

Pringapus 6&7 (also called PA6&7) is a readymade garment manufacturing facility located near Semarang in Central Java province of Indonesia. The facility is part of an existing campus of PT Ungaran Sari Garments with five operational manufacturing facilities (PA1 – PA5), and a canteen. This is the first facility of the company in Indonesia which is designed to meet global environmental sustainability benchmarks.  PA6&7 is spread over two floors with identical functional arrangement for garment manufacturing.

PTU Sari Garments 6&7 facility is the world’s highest-scoring LEED NC v2009 project, under the Industrial Manufacturing space type. It is also the 3rd highest scoring LEED project worldwide, under LEED New Construction v2009 category. The facility has achieved an energy cost savings of 51% compared to the ASHRAE 90.1.2007 base case comparison. The building is expected to perform 49% better than a conventional factory building in the region. The project has 200KWp roof top solar system which offsets 15% of total energy cost of the project.

The building is designed to be naturally ventilated with provisions for cross ventilation in the north-south façade that helps achieve thermal comfort conditions. The building has an optimal orientation and effective vertical fenestration to reduce direct solar heat gain while allowing maximum diffused daylight into the interiors. An efficient combination of ambient and task lighting has helped the project reduce light power density drastically leading to significant energy savings. The project deploys state-of-the-art efficient manufacturing equipment which further reduces the internal loads and energy use.

Pringapus 6&7, PT-Ungaran Sari Garments (PA6&7)
Semarang, Indonesia

Orientation

The initial design idea was to have a facility with the longer façade facing east-west. However, after several deliberations, the design team decided to orient the longer facades along the north-south direction. This effectively reduced direct heat gain from the west facade and allowed more diffused light from north (the project is located in the southern hemisphere).

Climate Responsive Design

As tropical buildings need to limit their exposure on east and west sides, the optimum form is inevitably rectangular, with the longer facades facing north south. This also helps in achieving shallow floor plans that allow natural cross ventilation. For this building, a shallow floor plate was achieved through incorporating two large courtyards that broke the geometry.

Form & Massing

The overall form of the building is rectangular with two intensely landscaped courtyards.  Longer facades face north & south to reduce direct heat gain primarily from the west facade and allow more diffused light from north as the project is located in the southern hemisphere.

The courtyard design was effective enough to reduce the building depth to under 30 m from an initial depth of 50 m.

The prevalent wind direction is from south-west to north-east. The building was designed to be naturally ventilated having cross ventilation provisions in the north-south façade that helps achieve the comfort conditions.

Façade & Envelope

The building façade has been designed to maximize diffused daylight intake. Light shelves effectively reflect the sunlight off their surfaces and ensure a more even and deeper distribution of daylight. A fixed ventilation louver system provision – below sill and above lintel level – has helped the facility achieve comfort conditions indoors.

Ventilation Design

The building is completely naturally ventilated. Operable windows have been provided to ensure occupant comfort. The areas of operable window meet the requirements of ASHRAE Standard 62.1-2007 paragraph 5.1 Natural Ventilation.

Daylight Design

More than 90% of the regularly occupied spaces are daylit, with access to glare-free daylight and view to the outdoors.

Artificial Lighting Design

100% of the lighting requirement is met by LEDs. Interior LPD is 0.34 (W/ft2) as against ASHRAE 90.1 2007 baseline 1.3 (W/ft2). Artificial lights have been carefully selected to ensure high colour rendering index (CRI) values, low glare, and low flickering. All task lighting is controllable through dimmers having 10 levels of lux setting.

Pringapus 6&7, PT-Ungaran Sari Garments (PA6&7)
Semarang, Indonesia

The project has 200 KWp roof top solar system that offsets 15% of the total energy cost of the project.

Pringapus 6&7, PT-Ungaran Sari Garments (PA6&7)
Semarang, Indonesia

Project has reduced portable water demand by 46.86% using water efficient fixtures and fittings

The Project landscaping uses local vegetation to avoid dependency on permanent irrigation system

Project has onsite sewage treatment plant which treats 100% of the sewage and recycled water is used for tertiary needs.

Nearly 10% of the rainwater is harvested and treated for freshwater needs.

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