Research Graduate ME (Construction & Management)
Professor & Head-Civil Department MIT- Pune
The present paper intends to highlight the needs for Green Concept. Many people refuse to go for green construction as they believe it costs more.Through an actual case study, it is demonstrated that in long-term, it would be more beneficial to construct a green building, even though the initial cost is more.
In continuation,the paper tries to give an overall view of the exciting developments taking place on the technology front for intelligent and green buildings, highlighting examples of "best in class" buildings employing green and intelligent technologies. These buildings are dynamic environments that respond to their occupants' changing needs and lifestyles.
The construction industry in the country is growing at a rapid pace and the rate of growth is 10% as compared to the world average of 5.2%. Hence energy efficiency in the building sector assumes tremendous importance.Buildings annually consume more than 20% of electricity used in India.
Thus, buildings, as they are designed and used today, contribute to serious environmental problems because of excessive consumption of energy and other natural resources. The close connection between energy use in buildings and environmental damage arises because of energy intensive solutions sought to construct a building and meet it's demands for heating, cooling, ventilation and lighting cause severe depletion of invaluable environmental resources. However, buildings can be designed to meet the occupant's need for thermal and visual comfort at reduced levels of energy and resource consumption. Energy resource efficiency in new construction can be affected by adopting an integrated approach on building design. Thus, an energy efficient building balances all aspect of energy in the building-lighting, space-conditioning, and ventilation–by providing an optimized mix of solar design, energy efficient equipments, and renewable sources of energy. Use of materials with low embodied energy, good landscaping, ratio of built form to open spaces, location of water bodies, proper orientation, forms a major component in energy efficient building design.
Civil engineering considers strength, durability and cost as the main criteria while selecting materials, planning and construction. Architecture gives more stress on aesthetics and comfort and pays attention to fulfilling psychological needs of occupants. Green building techniques seek to conserve and utilize natural resources, emphasize eco-friendly construction and think of minimum carbon footprint on global scale.
Need of Green Concept
Green building brings together a vast array of practices and techniques to reduce and ultimately eliminate the impacts of new buildings on the environment and human health. It often emphasizes taking advantage of renewable resources, e.g., using sunlight through passive solar, active solar, and photovoltaic techniques and using plants and trees through green roofs, rain gardens, and for reduction of rainwater run-off. Many other techniques, such as using packed gravel or permeable concrete instead of conventional concrete or asphalt to enhance replenishment of ground water, are used as well.
While the practices, or technologies, employed in green building are constantly evolving and may differ from region to region, there are fundamental principles that persist from which the method is derived: Siting and Structure Design Efficiency, Energy Efficiency, Water Efficiency, Materials Efficiency, Indoor Environmental Quality Enhancement, Operations and Maintenance Optimization, and Waste and Toxics Reduction. The essence of green building is an optimization of one or more of these principles. Also, with the proper synergistic design, individual green building technologies may work together to produce a greater cumulative effect.
On the aesthetic side of green architecture or sustainable design is the philosophy of designing a building that is in harmony with the natural features and resources surrounding the site. There are several key steps in designing sustainable buildings: specify 'green' building materials from local sources, reduce loads, optimize systems, and generate on-site renewable energy.
- Enhance and protect biodiversity and ecosystems
- Improve air and water quality
- Reduce waste streams
- Conserve and restore natural resources
- Reduce operating costs
- Create, expand, and shape markets for green product and services
- Improve occupant productivity
- Optimize life-cycle economic performance
- Enhance occupant comfort and health
- Heighten aesthetic qualities
- Minimize strain on local infrastructure
- Improve overall quality of life
Life Cycle Cost Analysis
There are numerous costs associated with acquiring, operating, maintaining, and disposing of a building or building system. Building-related costs usually fall into the following categories:
- Initial Costs—Purchase, Acquisition, Construction Costs
- Fuel Costs
- Operation, Maintenance, and Repair Costs
- Replacement Costs
- Residual Values—Resale or Salvage Values or Disposal Costs
- Finance Charges—Loan Interest Payments
- Non-Monetary Benefits or Costs
Most green buildings cost 0–4% more than the conventional buildings, with the largest concentration of reported "green premiums" between 0–1%. Green premiums increase with the level of greenness, but most LEED buildings, up through gold level, can be built for the same cost as conventional buildings. This stands in contrast to a common misperception that green buildings are much more expensive than conventional buildings. In fact, there is not that much significant difference in average cost for green buildings as compared to non-green buildings.
With the help of a practical example, the above facts are highlighted. Data is collected from the ongoing construction site. The work is construction of the Green Buildings. Data collected is as follows:
- Project Name : Kept Anonymous
- Site Address : Hinjewadi,Pune
|“Life cycle cost of Conventional Building System”|
|Sr.No.||Conventional Sub-System||Total Investment(Rs.)|
|1||Fire Fighting System||4326304|
|“Life cycle cost considering Green Features”|
|Sr.No.||Conventional Sub-Systems & Green Features||Total Investment(Rs.)|
|1||Total investment on conventional system||36,18,77,928|
|2||Sewage Treatment & Biogas Plant||13018738|
|3||Hybrid System ,Digital System||8998516|
|4||Water Treatment & Rainwater Harvesting Plant||8222049|
|5||Reticulating Gas System||8405450|
After Life Cycle Cost Calculation, installation cost of Green Building is:
= 404480961-361877928 = Rs.4,26,03,000
% increase in cost after Life Cycle Cost Calculation is;
Total saving after 20 years = Rs.4,74,26,400
Installation cost of Green Features after life cycle cost calculation = Rs.3.78,09,333
TOTAL SAVING = 4,74,26,400-4,26,03,000 = Rs.48,23,500
Therefore -> Benefit/Cost ratio for Green Features
=4.74,26,400/4,26,03,000 = 1.11>1....Ok
Considering these results, it is suggested that investment in Green Construction should be done, though there is an increase in initial investment.
Building Life-Cycle Cost (BLCC) Programs
The software can evaluate Federal, state, and local government projects for both new and existing buildings. While BLCC is oriented toward building-related decisions, it can be used to evaluate alternative designs for almost any project type in which higher capital investment costs and lower future operating-related costs exist.
Integration of IT and Green Technology
To reduce the energy consumption, the development of the "Green Building" has become the global movement of the building industry to conserve energy, to effectively utilize resource, and to improve the indoor environment control. To minimize the energy consumption and to increase the equipment efficiency are the objectives in development of intelligent green buildings. By installing mini sensors and automatic climate control facilities in the building, the energy consumption can be significantly reduced and the quality of indoor environment can be also improved.
Numerous smart control devices are now available in market which can be deployed easily for ensuring security, comfort and for energy and water conservation.There are restricted access control, intruder alarm, dimmer light controls, Bluetooth, Wi-Fi and/or net enabled smart devices, smoke detector, sensor based plumbing fixtures, automatic controls for opening and closing of venetian shutters or blinds etc. Siemens, Tata Honeywell and ABB are some of the world's largest producers of such controllers. Coupled with it, there are variety of innovative products like wind powered fans, waterless urinals, dual flush latrines, light tubes, LED lighting systems which can help in achieving green objectives.
Combining the concept of green building and technologies used in the intelligent building, an intelligent green building which is safe, healthy, convenient, comfortable, efficient and energy conserving can be built.
Intelligent buildings transcend integration to achieve interaction, in which the various independent systems work collectively to optimize the building's performance and constantly create an environment that is most conducive to the occupants' goals. Additionally, fully interoperable systems in intelligent buildings tend to perform better, cost less to maintain, and leave a smaller environmentalism print than individual utilities and communication systems.
Energy, buildings, and the environment are interlinked in a symbiotic relationship, and the results of this interaction can be optimized for maximum gains by convergence of "Green and Intelligent" building concepts. An intelligent building is one in which the building fabric, space, services and information systems can respond in an efficient manner to the initial and changing demands of the owner, the occupier and be in harmony with the environment. Intelligent buildings not only have energy efficiency but also have safety and telecommunications systems and other required automations propelled by innovations.
Technologies applied in intelligent buildings will improve the building environment and functionality for occupants, while reducing operational costs. Higher ROI and returns on assets are the key benefits: the building will have a higher value, with improved leasing possibilities. The US EPA's Energy Star program estimates that owners investing in energy upgrades can enhance building asset value by two to three times the amount invested. Furthermore, where a building's energy use is reduced by 30%, Net Operating Income (NOI) and building asset value are increased by about 5%.
LCCA of Intelligent Green Building
Typically, operations-related impacts account for over 80% of life cycle impacts in buildings. Owners' operating costs are significantly lowered as a result of more efficient operations and better control, enhancing a building's asset value. By enhancing connectivity between building systems and users, intelligent buildings help to balance the operational objectives and economic performance of buildings with emphasis on scalability and changing priorities. In an endeavor to provide a comfortable and reliable environment, intelligent buildings essentially help achieve a reduction in energy consumption, use resources more efficiently, and explore renewable alternatives that enable them to be financially, as well as environmentally sustainable assets over time. Reducing operating costs enhances a building's asset value.
Intelligent and green buildings experts and consultants, such as Smart Buildings, provide sophisticated ROI tools for commercial real estate to demonstrate initial cost savings, lowering vacancy rates in buildings, tenants staying longer, lowering amount owner is paying in terms of tenant improvement and improving net operating income, which all helps out a building's operating income which creates more value to the building.
5 Future Wonders of Intelligent Green Technology
The Dynamic Tower is environment-friendly with the ability to generate electricity for itself as well as other buildings nearby, making it the first building designed to be self-powered. It achieves this feat with wind turbines fitted between each rotating floor. An 80-story building will have up to 79 wind turbines, making it a true green power plant. The Dynamic Tower is also the first skyscraper to be built entirely from prefabricated parts that are custom made in a workshop, resulting of fast construction and of substantial cost savings. This approach, known as the Fisher-method can be completed in only seven days.Units can also be customized according to the owners needs and styles.
Each individual unit will be completely finished at the new Rotating Tower factory in Italy and exported worldwide. They will be equipped with all necessary plumbing and electric system, including all finishings from flooring to ceilings, bathrooms, kitchens, cabinets, lighting, and furniture.
The preassembled units are simply hooked to each other mechanically. This results in environmentally clean construction sites, avoiding unloading of materials, waste, noise and pollution. There will be less risk of accidents to construction workers, and construction time will be reduced by over 30%. Due to their particular construction method, prefabricated buildings will also be easy to maintain and repair. The building's maintenance facility, type of materials used, and the quality control employed will also make them more durable than any traditional structure.
Teatro Del Agua
The goal of the project is to achieve carbon neutrality. To do so, the intention is to achieve and explore every design method and technology that they can get their hands on from design efficiency, to the addition of green rooftops, smart metering and solar powered lighting in public spaces. Furthermore, the project is intended to integrate with Sydney's vision of the future by becoming one of the city's "Green Transformers" – the project will be one of a number of energy generating and water recycling sites that will provide these services to their own developments and the areas nearby.
Transbay Transit Center
Another Green Complex
The complex will fill an entire city block between Singapore's Marina Center and the Civic District with commercial, residential, retail, hotels, and a 'green' link to a Mass Rapid Transit (MRT) station. All facades will be fitted with solar cells and, to help control solar gain, direct sunlight will be filtered through ribbon-like canopies rising from the base of the entire complex to the exposed east and west elevations of the towers.
While it looks intensely complex, the design takes advantage of simple green building principles like passive solar, natural ventilation and natural cooling. Foster and Partners' dynamic design will function insynchronization with the surrounding climate, and just might be the perfect merger of elevated architecture and grounded green build thinking.
To minimize the energy consumption to a greater scale and to increase the equipment efficiency are the objectives in development of the Intelligent Green Buildings.Using fully un-interoperable systems in intelligent buildings tend to perform better, cost less to maintain, and leave a smaller environmental imprint than individual utilities and communication systems.
An emphasis therefore should be on "Green" and "clean" construction. Various agencies associated should take concentrate steps, in order to promote "Green Construction."