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1. Abstract

The assignment will be exploring some design approaches on environmentally friendly buildings and to define what is mean by the term “sustainable architecture”? Green architecture is a sustainable method of green building design: it is design and construction with the environment in mind. Green architects generally work with the key concepts of creating an energy efficient, environmentally friendly house.
The environmentally friendly building materials and construction methods will be introducing in this assignment (e.g. precast concrete). And the government how to promote green building and sustainable construction in Hong Kong.

2. Background

In recent years, we have seen movement in environmental concerns including development and facility introduction such as energy saving, longevity life, ecological tree planting surrounding real estate, where future environmental problems are seriously concerned. As for environmentally friendly building, we have an important term: “Sustainable Development”.
The wealth, which we enjoy a lot by using buildings as places for living or working, must be obtained by future generations. So we have to build houses that minimize their load on the environment as well as meet standards of quality.

3) Definition of the “Sustainable Architecture”

Sustainable architecture is architecture which is designed in an environmentally friendly way. The goal of sustainable or “green” architecture is to create structures which are beautiful and functional, but which also contribute to a sustainable lifestyle and culture. Interest in sustainable architecture grew radically in the early 21st century in response to growing concerns about the environment, but in fact people have been building sustainably for thousands of years, because sustainable projects are often practical in nature

It is defined as "the creation and responsible management of a healthy built environment based on resource efficient and ecological principles". Sustainably designed buildings aim to lessen their impact on our environment through energy and resource efficiency. It includes the following principles: * minimising non-renewable resource consumption * enhancing the natural environment * eliminating or minimising the use of toxins
Three Dimensions:

4. Case Study

Jockey Club Environmental Building

This project to achieve the target of being environmentally friendly.

a. Energy Saving & Orientation

The walls of the Jockey Club Environmental Building are very thick and are hollow in the center, which can reduce the heat intake in the summer and the heat loss in the winter. The thick outer wall also acts as shield.

Windows facing south and north directions are large and installed inwards on upper floors, giving a shade. On the other hand, window facing east and west directions are small. This can reduce the heat intake.

This building is not rectangular, therefore circular building design is the best choice because over all dimension of the building is circular instead of rectangular and that the total outer wall areas is smaller. It can save the building materials. Also with glass walls installed surrounding the atrium, natural sunlight is introduced and can be utilized to reduce the in house artificial lighting consumption in daytime, which can be reflected in the energy bill.

Sunlight can be a good lighting machine to use in the building. The skylight (Fig 4.1) at the centre of the building, to lead into the sunlight to the office as a result is can be saving electricity.

Fig 4.1 Skylight

b. Natural Ventilation

Right inside the open atrium, a footpath is introduced which links up the building and the park behind. This footpath encourages air circulation through the building. Wind flows through the footpath, enter the building. As hot air rises and escapes through the openings on top of building. Internal mechanical cooling demand can be reduced in cooler months.

Fig 4.2 Footpath

c. Building Material

During the construction period, application of recycling material was introduced to minimize the waste generation. Recyclable hoarding was applied which consisted of recycled polystyrene with cast in concrete into lightweight panel instead of traditional plywood hoarding. After the building structure completed and boundary fence was erected, the entire hoarding was removed and reused as internal permanent partitions inside the building.
5. Sustainable Building Materials

1. Construction Materials

a. Protective Coatings
To promote and guide less use of environmentally damaging organic solvents and discourage their continued harmful release into the atmosphere and reduce the selection and use of toxic components which can quite adversely impact upon human health and the environment at different stages of the product life cycle; and b. Precast Concrete
The greatest benefit with precast concrete is to reduce the construction site of noise, dust, and a large water and wood. "Although concrete is injected into the template, we have abandoned use of traditional wood and reinforcement steel, to facilitate recycling, reduces consumption of wood."

c. Reuse Materials: * Aggregate * Asphalt * Excavated materials

d. Recycle Materials * Expanded polystyrene * Metals * Glass * Plastic * Rubber

6. Renewable energy generation

a. Natural Ventilation
Natural ventilation is the process of supplying and removing air through an indoor space by natural means, meaning without the use of a fan or other mechanical system. It uses outdoor air flow caused by pressure differences between the building and its surrounding to provide ventilation and space cooling.

b. Day lighting
Ways to capture and direct the daylight into buildings include windows, light tubes, light shelves and skylights. All of these are openings to capture the light directly or through channels to the desired space. The building orientation, weather, or potential obstruction can affect how much light is captured.

c. Solar and Wind
The solar energy harvested can be categorized into three applications: electricity production, heating/cooling, and chemical process. The first two have been practiced in Hong Kong and they are also the most commonly used building application. For example, passive solar design can be used for space heating; solar water heating system can be used to provide hot water; and solar photovoltaic system can be used for generate electricity to supplement the building's current electricity supply. Wind, as mentioned above, can be used to power natural ventilation in the building or can be used to generate electricity and is well-appreciated because it is pollution-free.
7. Waste management

A. Site Management on minimizing of C&D Material/Waste

The waste management is options will be categorized in terms of preference from an environmental viewpoint. The options considered to preferable has the least impacts and are more sustainable in long term. The hierarchy is as follows:

* Avoidance and minimization, i.e. not generating waste through changing or improving practices and design; * Reuse of materials, thus avoiding disposal generally with limited reprocessing; * Treatment and recycling, according to relevant laws, regulations, guidelines and good practice as the last option.

The hierarchy is used to evaluate and select waste management options. The aim is to reduce and minimize the amount of waste to be generated and hence reduce the waste handling and disposal costs. For example, by reducing or eliminating over-ordering of construction materials, waste is avoided, and costs are reduced both in terms of purchasing and in disposal of wastes.

B. Saving & Reduce Water

Installing waste separation facilities such as bins or racks in green buildings together with publicity and promotional activities directed to the occupants of the building can help to recover more materials for recycling and reduce waste requiring disposal.

Less waste water disposal

8. Government Promote and Sustainable Construction

To promote green elements in the construction of buildings, the Government allows certain green features to be exempt from the calculation of gross floor area of the developments concerned if they fulfill the specified criteria for exemption. Examples of the green features include balconies, wider corridors and lift lobbies, communal sky gardens, communal podium gardens, acoustic fins, sunshades and reflectors, non-structural prefabricated external walls, utility platforms and mail delivery rooms with mailboxes.
The Considerate Contractor Site Award Scheme and the Green Contractor Award Scheme have been launched to encourage and give recognition to the private sector to practise sustainable design and construction.
To improve the indoor air quality and promote public awareness of the importance of IAQ, the Government has implemented an IAQ Management Programme. One of the core tasks of the Programme is to launch a voluntary IAQ Certification Scheme for Offices and Public Places. Premises have their IAQ meeting the two-level IAQ objectives (Good or Excellent) are awarded with "Good Class" or "Excellent Class" IAQ certificate. IAQ labels are also issued to these premises for posting at prominent locations to make known to the public of such achievement.

9. Conclusion Nowadays in Hong Kong a ‘Sustainable Architecture’ is an important concept, it can let an country/city to get a ‘Sustainable Development’.

Almost every country/city response to grow concerns about the environment, so many of ‘Sustainable Architecture’ becomes more extremely important.

During this project, let me know more about sustainable building is how to design, what kind of principles include, what material can be use.

Also I can find an renewable energy how to replace original energy.
I hope more people can be implementing to save energy and reduce energy.

Reference:

GovHK (2010) Construction Waste[online]. The Government of the Hong Kong Special Administrative Region. Available from:http:www.gov.hk/en/residents/environment/ waste/constructionwaste.htm (accessed May 20, 2010)

Winston, F K Fong and Norman, K C Ng (no date), Recycling of construction demolition materials in Hong Kong [Online]. Hong Kong: Civil Engineering Department. The Government of the HKSAR. Available from: www. cedd.gov.hk/tc/services/recycling/doc/ pap_rec_cdm.pdf [accessed 20 May 2010]

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