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Energy management is a discipline which consists of a collection of ideas and techniques relating to the extraction, distribution; purchase and utilization of energy, the influence of the various professional knowledge was training by management team who establish a formal energy method and outline the basic techniques which determine to go the energy efficiency in building. Nowadays, many organizations would agree some move towards the more efficient use of energy and use some renewable energy resources. It will help reduce reliance on fossil fuels and reduce green gas emissions. Energy management includes effective use of energy to minimize costs and to enhance competitive business situation and involves energy awareness and motivates employees and supervisors to save energy.
The climatic condition provides an essential solar radiation to strike the solar cell to provide electricity energy. Hong Kong is a high rise and high density city with a subtropical climate. Refer previous chapter 2.3 shows the monthly average data of the general climatic condition; the data indicates that some months were significant affect the global solar radiations from July to December, when insufficient solar radiation must be consider to ensure continues electricity supply by the auxiliary energy supporting. Furthermore, in Hong Kong weather condition, solar cell system structure should be added extra installation cost to place the strong structure to withstand high gales during typhoon season.
The economics of PV system is determined by the cost of system and the production for the electricity generated. The cost of system includes capital cost such as investment, interest and operating cost such as maintenance, labor cost. Each owner need to understand the importance of each element and is necessary to finding the correct the economic balance of project cost for solar energy application. Normally, a lifetime of PV system 25 years is assumed. The accumulative operation cost are generally low, the major economic factor required high initial investment that are high compared to fossil fuel and other conventional energy system, so economic analysis is extremely important for the engineer for evaluating of energy technologies. Beside, the solar cells have a high potential for reliability and long life.
Government's role is important for renewable energy deployment, energy policy setting will help to develop energy markets and operate efficiency. Based on global environment impact in future, the government will continue to establish the strategies for energy sustainable development in public work projects and encourage the private parties to participate. It can be help to review government policy in order to identify where the barrier can be removed. In Hong Kong, many complex regulations of different government's departments must be applied to place the PV system on the building or land by building developers or owners. For example, part of electricity and mechanical must approved by EMSD and electric supplies company, part of supporting structure design must approved by Building Department, and part of water supply facility must be approved by Water supplies Department when is application of solar water thermal system. So government departments could be integrated to increase the development of renewable energy system.
The optimizing energy approach adopted to use of various kind of operation activities that contains multifarious activities such as energy data entry, classification of energy cost and profit, monitoring the performance of energy system and prediction of equipment performance for remedial process etc. This would help us in understanding the various parameters on energy consumption, energy efficiency, operating costs and maximize profit. The energy manager enables to achieve a better understanding the information of plants performance in their building and has led to plant improvement and energy saving. This information is vital to implement the effective energy management program.
Photovoltaic conversion could be solved the technical and economic problems standing in the way of widespread use of solar cells. Large-scale application will require much lower price and installed in the countryside, they are already economically competitive, for example, China Light & Power Company (CLP) is building the Hong Kong's first standalone solar energy power system on Town Island in Sai Kung. Its system involved putting up 100 solar panels which can generate 20 Kilowatts. The next stage will install up to 800 solar panels in 2011.
There is a city of many high rise buildings and high density development in Hong Kong where is difficult to promote the solar energy application and current building developers are lack of incentive in application of the renewable energy applications due to their business reasons. Furthermore, Government's has provided slimly effort for stimulating the renewable energy market. Up to now, solar energy applications in Hong Kong are small in number where almost installed among in government buildings and public area. The projects included the headquarters of the EMSD, Whachai Tower, Science Park and Castle Peak Hospital.
According of stage report 1 by EMSD that evaluated the potential of different forms of renewable energy technologies for local use, PV systems are mainly divided into 2 categories which are Building Integrated Photovoltaic (BIPV) type and non-BIPV type. The BIPV type is installed on rooftops, facades and envelop of a building, while non-BIPV type is build along highway noise barriers, slope and non-building structure etc.
Solar energy in Hong Kong is regarded mildly rich, and has annual average global horizontal solar irradiance of 1290 KWh/m2. According to the report indicated that the potential of solar energy in Hong Kong is 5944 GWh/year which is equivalent to around 15% of the 2006 electricity consumption . This was derived by assuming that all feasible land area of solar application were covered up by both BIPV and non-BIPV system. This could be quite a significant use of renewable energy to meet its energy requirement. Although there is difficult to find suitable location for large scale solar energy application in the high density urban areas, commercial buildings for installing BIPV system are considered a reasonable choice. The country side and new town are high potential for developing its energy system.
Government's role provides actually financial and technical supporting, enforcement through legislation to stimulate to develop renewable energy market and draws all the people's attention to understand the importance of energy saving through some sample demonstration project. It makes to increase public awareness and education is crucial for the more exploitation of renewable energy resources in Hong Kong.
In brief, people can learn about the importance of energy saving and how to effective use renewable energy that promote around the world, more and more people understand to take better care of the earth. Business parties have opportunity for people who sell environmentally products; thus customers have a chance to purchase that enables them to live without harming air and our working and living environment.