Heat results when photons, packets of light energy, hit the atoms that compose a substance (water, your body, asphalt), exciting them. Solar thermal technologies include passive solar systems for heating buildings (or cooling! ); solar collectors, often used to provide hot water for homes; systems and concentrating solar power. Solar energy These systems, also known as solar thermal power plants use the sun 's heat to produce steam, which then turns a turbine and generates electricity. (Fossil fuel power plants also generate electricity by first creating steam to drive a turbine.)
Solar energy is a natural renewable resource that has a huge potential because it can easily supply energy for the whole Earth and will never run out. The sun produces a huge amount of energy in light and heat form. It can be used by humans in several ways, for example in solar heating, photovoltaics, solar thermal energy, molten salt power plants and concentrator solar power technologies. Solar energy can either be used directly or indirectly by first turning it into electricity. Potential The amount of solar energy that is absorbed by the atmosphere is huge, about 3,850,000 exajoules (1 exajoule = 1018 joules) per year.
A solar panel is a device that is used to absorb energy from the sun in order to generate heat or in many cases electricity. It is also referred to as a photovoltaic cell since it is made of many cells that are used to convert the light from the sun into electricity. The only raw material for these solar panels is the sun. it is made in such a way that the cells face the sun in order to enable maximum absorption of the sun rays. The greater the energy from the sun is, the more the electricity that is generated.
This type of method uses building to capture sun’ s energy . If the building has many windows this method can work effectively (Lee, 2012:5).In remote areas this type of method can be difficult to be used. But industrial companies can work with this kind of method. To summarize all these methods are so vital in our everyday lives. Summing up, the importance of solar energy enhances homes and makes life easier to some people be it businesses, homes, and industries.
There are some weaknesses of solar energy that can be identified. 1) Cost To build solar energy, it requires additional equipment to convert direct current electricity (DC) to the alternating current (AC) for use on the power grid. High production costs due to silicon and semiconductor materials are not easy to find and technology factors for creating high efficiency solar photovoltaic (PV) panels. The initial cost of purchasing a solar system is fairly high. Although the government has introduced some schemes for encouraging the adoption of renewable energy sources,
1 OVERVIEW OF SOLAR COLLECTOR : Solar energy collectors are special kind of heat exchangers that transform solar radiation energy to internal energy of the transport medium. The major component of any solar system is the solar collector. This is a device which absorbs the incoming solar radiation, converts it into heat, and transfers this heat to a fluid (usually air, water, or oil) flowing through the collector. The solar energy thus collected is carried from the circulating fluid either directly to the hot water or space conditioning equipment or to a thermal energy storage tank from which can be drawn for use at night and/or cloudy days. There are basically two types of solar collectors: nonconcentrating or stationary and concentrating.
When power required is more than delivered by a single cell, cells are connected to form module. PV modules are grouped to form PV array for high power applications. The photovoltaic systems applications are used in stand-alone configurations and grid connected configurations. The photovoltaic system applications are used in street lighting, power plants, electric vehicles, water pumping, hybrid systems, domestic lightening, military and space applications etc. The technology improvement of the PV cell makes the PV array more reliable.
Fenestration and its variable components (a) Size, position and orientation of windows affect sun penetration i.e. solar heat gain, but also affect ventilation, especially where cross ventilation is desirable. (b) Glass: single, double, multiple and glass quality: special glasses (heat absorbing or heat reflecting glasses) may be used to improve an otherwise bad situation, by reducing the solar heat gain. (c) Closing mechanism: fixed glass, louvers, opening sashes, type of sashes used (Fig.1) (d) Internal blinds and curtains can slightly reduce the solar heat gain, by reducing the beam (direct) radiation, but they become heated and will re-emit that heat, thus causing convective gains. (e) External shading devices are the most positive way of controlling solar heat gain.
Apparently, solar energy is free, renewable, clean and non-toxic energy which can compete and suppress all types of energy on earth, such as nuclear energy and fossil fuel. Furthermore, the only source of solar energy comes from the sunlight, where in Malaysia, our country is consistently exposed to high an intensity of sunlight throughout the year. Therefore, implementation of solar PV system in residential houses is an effective and efficient green technology feature. Basically, solar energy is directly converted into electrical energy through the process of photovoltaic occurred inside the solar cell. When sunlight strikes on the solar cell inside a solar panel, the solar radiation will trigger the semi-conductor cell to release electrons, hence,
In just 50 minutes, the Sun makes the same amount of the planet 's annual energy consumption . Solar Thermal power, uses the sun’s energy to make cheap thermal energy, which does not harm the environment, unlike fossil fuels . There are different methods to use solar energy. The first one provides heating and hot water to an average home by collecting energy from the sun through solar panels installed in the same building. The second method consists in using concentrated solar heat energy and big power utilities to indirectly make electricity.