Loading…


Project Description

Liberated Jaffna today recuperates gradually in the aftermath of 30 years of war and mayhem. Speculated revival of the city through reconstruction is yet to take place while actual development projects unfold at an extremely slow pace. In this context an initiative taken by HNB to build a regional office in Jaffna would undoubtedly spark a lot of momentum -preceded only by the reconstruction of the Jaffna public library- and pave the way for further development by making a powerful statement whilst setting a benchmark as a true partner in progress. In Post war architecture it is imperative that the proposed building design inherits the following characteristics. I. CULTURAL IDENTITY/SENSE OF BELONGING - A building with strong cultural identity in its architecture, to which the “Jaffna man” can relate to instilling a profound sense of belonging in a fragile post war social mindset. II. STRENGTH AND STABILITY - The building should also portray the strength and stability of the financial institution HNB is-being the very first of institutional buildings in the post war region. III. CONTEMPORARY DESIGN - Whist incorporating the above, the proposed design would be contemporary in its architecture and technology, embracing principles of sustainability and green design profoundly reflected in its appearance.

Hatton national bank
Hnb jaffna
Hnb jaffna copy
4
Hnb jaffna %281%29
7lowint
8lowint
9lowint
10low
2013 04 30 09.51.15

Building Details


Bank

New building project

1550 m²

5

3062 m²

2386 m²

231 m²

LEED Gold (USGBC)

EURO 1185000

EURO 387

2013

2013

Project Team


Shayan Kumaradas-Chartered Architects

Sanken Construction Pvt. Ltd.

CLEF Consultants Pvt. Ltd.

Archt. Shayan Kumaradas

Environ Sustainability Globe Pvt. Ltd.

Eng. Chandana Dalugoda

SKCA / Eng. Thushara De Silva

Environ Sustainability Globe Pvt. Ltd

Climate Analysis


Jaffna features a tropical rainforest climate with no true dry season month. Jaffna has the highest average temperature in Sri Lanka of 28 °C. The temperature is highest in the months of April – May and August – September. The temperature is coolest in December – January. The annual rainfall is brought in by the North East monsoon and it varies from one place to the other and also from year to year. The average rainfall is 1250mm in the western part of Jaffna peninsula

Hnb jaffna

Design Approach


HNB has an Environmental and Social Management System (ESMS), which helps the Bank to determine how responsible it is towards the environment. The ESMS system is designed to integrate the site and the building. No environmental pollution came across the production and the maintenance work of the building. The building is large foot print to the site, but vertical gardens will provide necessary green back to the earth. The ground floor is paved with hardscape - Open grid paving; 15% porous, less reflective surfaces reduce the heat radiation within the site.

I. The entire building is raised off the ground to create air floor which cools the building. II. Double screens introduced on the eastern and western side of the building reflect glare and excess sunlight filtering in only the required. III. The eastern and western wings are further cooled by a planters and thick vegetation, not only serving as coolants to the cross ventilation but also as filters for the polluted air. IV. All the spaces are cross ventilated and could be used sustainably without air conditioning. V. The screens also trap and redirect the north eastern monsoonal winds. VI. In total square feet of planting is proposed which include all the flat terraces. VII. A special overhead tank will collect rainwater from the gable roof with a spillover storage tank VIII. Solar panels on the gable roof will generate energy which will be used for garden lights and toilets.
0  hnb presentation drawings 2016
1  hnb presentation drawings 2016

Document


Special Feature


Spaces are naturally lit where possible. The double skin facade with its plant troughs and operable louvers reduce glare and heat gain

The use of water is reduced by 53%

The biggest structural challenge was to building the vertical garden fixed wind wrapping around the building. The building system needs to provide room to maintain the vertical garden as well. The exterior structure was made of galvanized iron structure and shading of the building is achieved by the same structure.

The use of a low maintenance materiality, especially for the building envelope is notable.

The building has succeeded in reducing its use daily energy coming from the main grid of national power supply. The energy use is reduced by using passive techniques and generating energy within the building complex. The energy is saved by 27.61% and the use of water by 53%, while generating 10% of its energy from renewable sources.

The ground floor is paved with Hardscape - Open grid paving; 15% porous, less reflective surfaces reduce the heat radiation within the site.

Building Material


RCC frame structure with steel exterior second skin structure.

RCC

Cement based vertical panels. Aluminium based operable louver as external skin

Glazed Aluminium with operable louver as external shade element

RCC floors finished with porcelain tiles. Selected areas a carpet. (e.g. auditorium)

Simple natural finishes for exterior elements are utilised, while high performance finishes are adopted for the more public interior spaces.

The roof is constructed by using Zn /Al profiled roofing sheets. SRI 40. Insulation - 50mm double layer glass wool

Energy systems


LED / T5s. Operated by sensor system and commands are being given by the BMS

LED - controlled by BMS

n/a

The typical central air conditioning system is an Air cooled chiler, with an outdoor air conditioning, or "compressor bearing unit" and an indoor coil

yes

The primary environmental simulation was carried out using EQUEST. The building also has an advance BMS (Building Management System) through which the energy efficiency is monitored at a central point and forcase. The BMS help to measure the energy requirement of the building and supply from the main grid or the solar energy generating systems fixed in the roof top.

A 15kVA roof mounted solar PV system with net metering facility generates 1,800 kWh of electricity
Hnb solar project2
Hnb info
Total annual bill

Lessons Learned


The principles of basic design followed in Kovils, traditional Jaffna houses and public buildings will dictate the architecture of the building, Henceforth sharing a strong sense of belonging to its cultural and built context.