At week 6, continue my research for my project
Energy Conversion
Energy can’t be created or destroy it
only can be from one energy to one energy .The process transformation changing
one form of energy to another is called Energy transformation or energy
conversion . Energy in a system may be transformed so that it resides in a
different state, or a different type of energy. Energy in many states may be
used to do many varieties of physical work. Energy may be used in natural
processes or machines, or else to provide some service to society such as heat,
light, or motion. There is a device that converts energy from one form to
another called transducer. There is a device that converts energy from one form
to another called transducer. For example using LM35 as transducer to detect
heat from a candle and display it at LCD .The conversion is from heat to
voltage.
Energy harvesting or
also known as power harvesting is the process by which energy is derived from
external sources solar power, thermal energy, wind energy, salinity gradients
and kinetic energy captured. Energy harvesters provide a very small amount of
power enough for low-energy device. While the energy source for energy
harvesters is present as ambient background and is free.
Some of the energy
harvesting systems which use different sources to generate electrical energy
and their efficiencies are given below
·
Mechanical energy into
electricity-generators (20-70% efficiency), piezoelectric systems (0.5-15%
efficiency)
·
Chemical into electricity; fuel cells
(25-35% efficiency), primary batteries, rechargeable batteries
·
Heat/cold into electricity;
seebeck-elements (2-5% efficiency)
·
Electromagnetic radiation into
electricity; photovoltaic systems.
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