Advances in Science and Technology
Research Journal
Volume 13, Issue 1, March 2019, pages 88–109
Received: 2018.12.30
Revised: 2019.01.09
Accepted: 2019.02.12
Available online: 2019.02.26
https://doi.org/10.12913/22998624/103425
State of the Art Compendium of Macro and Micro Energies
Mushtaq Ahmad1*, Salmia Beddu1, Zarina binti Itam1, Firas Basim Ismail Alanimi2
1
Department of Civil Engineering, Universiti Tenaga, Nasional Putrajaya Campus, Malaysia
Department of Power Generation, Research Centre, Universiti Tenaga, Malaysia
* Corresponding author’s e-mail: ma_5099@yahoo.com
2
ABSTRACT
In the span of past few decades, population, urbanization and industrialization have transformed the mankind living standard and dynamics of the nature. Certainly, energy is the basic need for all living organisms. Energy is the
route towards the economic growth. The evidence shows that the countries faced with energy crises are left behind
in the economic activities; as a result, people are deprived. This study reviewed the available renewable energy
resources and potential with positive and negative aspects. This study comprehensively discusses the renewable
macro and micro energy resources studied in the past two decades reported in various studies. The paper is divided
into two sections; the first section discusses the energy produced in the macro level and the second section discusses the energy produced using different strategies and techniques in the micro level. The potential and positive
outcomes of the energy resources were identified. New paradigm of micro energies and importance of reusing the
available resource of micro energy using different resources like energy harvesting on the road surface, vibration,
airflow, radio frequency and thermal energy etc. were discussed. Lastly, the study focus does not only review but
also finds the potential and opportunities for the researchers in the future to utilize the renewable energy resources.
Keywords: macro and micro energy resources, renewable energy, renewable energies potential.
INTRODUCTION
In order to satisfy our requirement for
power (electricity) “We are drilling holes miles
deep under the surface of oceans, fracturing
stones in the crust of the earth, transporting
fuel in a huge ships and pipelines from one
side of the earth to the other to operate machinery to produce electricity” [1]. The bitter truth
about rapid changes of anthropogenic origin
is undeniable [2÷4]. In the span of past three
decades, population, urbanization and industrialization have transformed the living standards
of mankind and dynamics of the nature. Certainly, energy is the basic need for all living
organisms and a route towards the economic
growth [5, 6]. In the span of quinquennium, a
large part of population has migrated to cities
and 3.0 billion is forecast to follow in 2050 [7].
The growing energy demand gap was bridged
with the energy produced from fossil fuels. As
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a result, fossil fuels were found to be the key
contributor to the emission of greenhouse gases (GHG), especially the carbon dioxide (CO2)
released to the environment. Over the past 15
years, unprecedented changes in the consumption of energy resources caused a drastic impact on the environment. The trend towards
investment and utilization of green and renewable energy has increased worldwide [8]. The
purpose of this research was to gather information on the macro and micro level energy produced and development by different countries.
The up-to-date data and materials published by
the world energy councils, renewable energy
resources, renewable energy review reports
and other research papers were reviewed. This
paper will help the researchers to identify the
area and potentials of renewable energies like
new areas in the micro level energy generation
and storage, which are hot topics among engineers and scientists.
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Fig. 1. Comparison of the energy resources and consumption [8]
POTENTIALS RENEWABLE ENERGIES
RESOURCES
The comparison of available energy resources
and its consumption for over past 15 years have
been reported by world energy council [8] and
British Petroleum BP [9], as shown in Figure 1.
Oil remained the world’s leading fuel consumption in 2015, which accounted for 32.95% of the
worldwide energy consumption.
The depletion and negative impact on the environment are the greatest obstacles to the utilization of non-renewable energy resources. Thus,
to address the issue of insistent pressure on the
utilization of non-renewable resources, a series of
studies have been carried out to use the renewable and sustainable resource to produce energy.
Scientists and engineers are always keen on renewable energy resources to eliminate the dependency of mankind on the non-renewable energy
resources. Furthermore, reducing the greenhouse
gases (GHG) effect on Earth and protecting the
global environment for the future generation is
the top priority. Extensive technologies have been
established to produce safe, green and renewable
energy but they are far too slow compared to the
non-renewable energy consumption [9].
The World Energy resources [8] statistics
shows that the input of total renewable energy to
the global energy grew significantly in 2015. Figure 2 shows the global renewable energy accounted for 23.5% of the total energy consumption in
2015 [10]. However, the contribution of renewable
energy is far slower than the non-renewable energy
consumption by resources [10] where the potential
to generate renewable energy is large [11].
The access to the sustainable energy is one of
the greatest challenges facing the world. Nature
can inspire innovative solutions for future energy
systems and technology design; some renewable
energy technologies have been found available
in nature. However, more can be learnt to help
Fig. 2. Global energy produced by sources 2015 [10]
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Fig. 3. Primary sources of Bioenergy [16]
us successfully address our future energy needs.
Major developments in the renewable energy resources are overlooked in the current scenario.
Figure 2 shows the macro and micro renewable
energy resources and each is briefly discussed to
understand the potential and gap.
MACRO ENERGY
Hydropower Energy
Most of the renewable energy sources originate from the natural movement of air and water/
fluid [12] and the hydro energy is derived from
the energy of moving water.
Blowing air and flowing water create energy
which can be stored and utilized. The hydropower
energy is generated from the flowing water and
by using mechanical technology such as turbines
to convert the energy and further increase the
supply. Hydropower generates energy on a macro
scale and which is supplied over large distance
but, unfortunately, not all countries have the hydropower potential [13]. According to the world
Energy Resources [8], amongst the renewable energy resources, the hydro-energy is leading and
globally supplied 71% at the end of 2015. In addition, the globally underdeveloped potential is
estimated at 10,000 TWh/y; between 2007 and
2015 the total capacity has increased by 30%.
Approximately 10,000 TWh/year of unutilized
hydropower potential exists worldwide and offers
many opportunities for hydropower development.
According to IRENA, [10] the countries producing more than half of the global hydropower energy are China (1126 TWh), USA (250 TWh),
Brazil (382 TWh), Canada (376 TWh), India (120
TWh) and Russia (160 TWh).
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Bioenergy
Bioenergy is a versatile source of renewable
energy and biomass can be converted into solid,
liquid and gaseous states of energy. The use of bioenergy can significantly reduce the greenhouse gas
emission [14]. In developed countries, bioenergy
is promoted as an alternative or more sustainable
source for hydrocarbons, especially for transportation fuels like bioethanol and biodiesel. There are
multiple challenges and opportunities for bioenergy
as a potential driver of sustainable development
given enough economic and technological support.
According to the World Bioenergy Association [15],
bioenergy has the largest contribution of 14% from
the total 18% renewable energy and global supplies
amount to 10% of all renewable energies. The bioenergy sources exist in many forms and the biomass
energy comes from different sources like wood, forestry residues, charcoal, pellets, agriculture crops
and residues, municipal and industrial waste, biogas,
biofuels etc. The key suppliers of the biomass energies are categorized into forestry, waste and agriculture. Biomass annual growth rate is 2.3%, whereas
biogas – 11.2% and liquid biofuels– 15.6%, experience highest increase. Forestry is the main contributor with 87%, followed by agriculture – 10%, and
municipal solid waste with landfills gas contribute
3% of the biomass key energy generators.
Electricity produced from the bioenergy is
the third largest renewable source. Bioelectricity
generated in 2014 was 493 TWh and solid biomass majorly contributed to this value [15]. The
impact on climate using bioenergy is significant
by reducing greenhouse gases. However, in the
development process, transportation, conversion
bioenergy might have some carbon inputs but the
overall life cycle and supply chain has the greatest benefit to the climate [10].
Advances in Science and Technology Research Journal Vol. 13(1), 2019
Fig. 4. Municipal solid waste treatment techniques and their products [19]
Waste to Energy
Waste to Energy (WTE) is the sustainable approach to generate energy (electricity) by utilizing municipal solid waste. Reuse of waste products to recover energy in the form of electricity or
heat is the most appropriate method to solve the
waste problem [17]. Waste to energy is the source
of renewable energy which is economical, feasible and eco-friendly [18, 19]. Comparatively, the
waste to energy production is lower than fossil
fuel but since the aim is to reduce the municipal
solid waste, the best way to recycle is to generate
electricity. Different technologies can be used to
obtain energy from the waste products [20]. Figure 4 shows the clear picture of technologies use
in the energy conversion process.
Globally, an average waste generate per
person per day amounts to 1-2kg [21] but the
potential of WTE operation strongly depends
on the country economic, social, political conditions [20]. In the high income countries, the
implementation of waste to energy is easier by
using various technologies than in the low income countries [20, 22]. Thus, the adoption of
waste to energy has been more advanced in the
developed countries [19]. In some studies, the
impact of implementation of WtE constitutes a
risk to the climate, as WtE is the big contributor
of the methane gas to the environment [23, 24].
In contrast, a study of [25] stated that reusing of
waste product will bring the positive influence
on the climate change. Waste plastic products,
followed by papers, textile and other waste organic materials have high potential for the reuse
of waste and energy production. Three types of
technologies are mainly used to convert solid
waste into the useful energy, i.e. biochemical
extraction, thermochemical extraction and mechanical extraction [26].
Solar Energy
The infinite and free source of energy existing
in our planet is the Sun. The sun radiates massive
heat energy every day [1, 27]. The Sun energy radiation is greater than the energy consumed annually by the world population [8, 27]. Sunlight has
the highest potential of producing renewable energy [28]. The sun is composed of hydrogen and
helium atoms and generates its own energy from
the process of nuclear fusion [27]. The estimated
average solar energy hit at earth surface is 342
W/m2. The Earth surface received a small portion
of solar heat energy, where 30% was reflected
back into the space from the 70% and major part
absorbed by the land and oceans. The effective
yearly available solar irradiance in different parts
of the world is 60-250 W/m2, the geographical location is an essential part of solar irradiance [1, 8,
27÷31]. The solar energy has wide application in
the daily life [28]. Solar energy powers the water
cycles which move the water and energy can be
harvested from the moving water [12].
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Fig. 5. Solar energy classification [28]
Solar energy drives the wind which allows
running the turbines and producing electrical energy from the kinetic energy. Plants use the solar
energy in the process of photosynthesis. Biomass
can trace its energy source back to the sun. Even
fossil fuels originally received their energy from
the sun and solar energy can also be harvest in
the macro level by embedding different energy
storage and conversation instruments. Solar energy has been used for centuries as in the ancient
time people used magnifying glass to focus sunlight and make a fire [1]. With the advancement
of technologies, solar energy has been used for
water heating and solar energy gas been collected
to make steam and run an engine [28]. Harvesting
and utilization of solar energy is the key concept
by using active and passive technologies to obtain
the advantages of producing solar electricity [32].
Solar energy collection, storage and distribution
in the form of heat without transforming into the
electrical energy are categorized as passive solar
energy. In contrast, solar energy collection and
using mechanical or electrical technologies to
convert heat energy into power energy or other
meaningful energy is categorized as active solar
energy, as shown in Figure 5.
Massively available source of solar energy,
with the highest potential to produce energy at
minimum cost and high efficiency compared to
other renewable sources of energy, is highly recommended in many countries [33, 34]. Extensive
research has been published on the potential, economic and environmental aspects value of the solar energy where scientists successfully launched
several active and passive technologies to collect,
store and convert solar energies from one form
to another. Recently, governments in many coun92
tries have taken initiative to produce solar/clean
energy on a large scale but the developing countries are still far from the usage of technologies.
Figure 2 shows the global contribution of solar
energy to the renewable amounts to 1.0% [10].
Different regions on Earth receive more or
less solar irradiance. Some regions on Earth may
be more suitable for collection and generation of
solar energy [35]. Rapid growth and high demand
for solar energy occur across the world. There are
few barriers in the acceptance and implementation of solar energy on large scale such the high
cost [33]. The potential and performance efficiency of the solar energy is highly dependent
on the geographical location, sunshine intensity,
wind speed, cloudiness [35, 36]. The awareness
and acceptance among rural populated area was
found as a barrier which should be overcome and
people should be educated with the potential benefits of solar energy [33]. Globally, solar powered
electricity generation reached 227 GWe at the
end of 2015 and total estimated capacity of solar energy is 406 GWe. Photovoltaic energy is the
mainstream solar power energy which drastically
increased in the last few years. China is leading
in terms of solar PV panel installation 23% followed by the USA – 14%, Japan – 14%, Germany
– 13%, and – Italy 6%; 30% PV installation corresponds to the rest of countries on Earth [8, 9, 30].
Geothermal Energy
Earth’s interior contains a massive amount of
heat energy also known Geothermal Energy [3739]. Over the past few decades, the global capacity of geothermal energy has increased at the rate
of 3-4% annually [37]. Geothermal energy is a
clean renewable energy source with the highest
capacity factor up to 90% [37÷41].
Although geothermal energy emits some
level of greenhouse gases to the environment, the
continuously restoring heat energy in the Earth’s
crust make it renewable energy. Among the primary energy resources referred to in Figure 2,
the geothermal energy contribution is the least to
Table 1. Capacity factor comparison [41]
Technology
Capacity Factor (%)
Geothermal
89-97
Biomass
80
Wind
26-40
Solar
22.5-32.5
Advances in Science and Technology Research Journal Vol. 13(1), 2019
Fig. 6. Countries with over 50MW geothermal energy capacity [41]
the world energy consumption and production, as
less than 1.0% electricity is produced from geothermal energy [8÷10]. Within 3 km of the continental crust, the roughly estimated geothermal
energy is 43 x106 EJ [8] and the available geothermal energy reserve can supply energy for approximately 217 million years [37].
Since 1950s, geothermal energy has attracted
many countries [41]. About 315MW new geothermal plants were installed and raised the global
total capacity from 11GW in 2010 to 13.5GW in
2015 [8, 10, 37, 41]. Indonesia and Turkey are the
leading countries in geothermal energy followed
by United States, Mexico, Kenya, Japan and Germany [8, 41]. Among other countries, Malaysia is
also very concerned and actively seeking renewable energy resources. Tawau geothermal plant is
the first geothermal plant in Malaysia expected to
start operation in June 2018 with maximum capac-
ity of electricity generation 30MW [42]. Generally,
two methods are used to produce electricity from
the geothermal field. The steam extracted from the
geothermal field runs a turbine directly or using hot
pressurized fluid to create steam from the low boiling point liquid to operate the turbine [41].
The Earth’s natural heat reserves are immense
and geothermal energy has the highest capacity
factor over other renewable energy technologies.
Geothermal energy can play an important role in
the countries that have the potential. In the developing economies like Pakistan, Kenya and Indonesia, the geothermal potential can play a key role to
produce electricity and overcome the energy crises.
Wind Energy
Globally, wind energy is the fastest growing
resource of renewable energy and well-proven in
Fig. 7. Global addition of wind capacity [10]
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terms of cost-effectiveness [43]. In 2015, wind
global growth rate was 17.2% and wind power
generation capacity reached 435 GW [8]. According to World Energy Resources [8] estimated the
wind power generation is 950TWh which is 4%
of the global renewable energy shown in Figure
3. Denmark produces the highest 42% wind power, whereas in Germany the wind power contribution reached to 13% in 2015. Wind power can
be generated from onshore and offshore. Figure 7
shows the global addition of wind power.
Wind power output is highly dependent on
the wind speed [44÷45]. The output increases
with wind speed and remains constant above the
design wind speed. Wind turbines do not produce
wind energy on low or very high wind speed, and
stop working as a result. The wind power management is an important issue for the large scale
wind power grid. The wind power capacity factor
changes and depends on the wind speed. Site to
site capacity factor for wind power is different.
In the UK it reached 26-35% onshore and the offshore wind capacity in Denmark reached to 4150% [44, 46]. Wind power generation typically
depends on three factors: the turbine type (vertical/horizontal axis), installation of wind power
(onshore/offshore) and grid connectivity (connected or standby). Horizontal wind turbine is
most commonly used with possibly two or three
blades [44÷45]. In order to overcome the environmental and other wind speed limitation issues,
an alternative design called Vortex without rotor
blades has been introduced by Spanish to harvest
wind energy, as shown in Figure 8. The turbine is
run through the vortices phenomena [8].
Airborne is the latest wind generation technology among Google’s Makani Project which is
a kite type device tied to the ground and rotated
in orbit producing electricity. Buoyant airborne
turbine (BAT) by Altaeros Energies consists of a
conventional HAWT suspended and held afloat in
a helium filled shell. Airborne wind solutions are
emerging designs yet to reach commercial viability due to the challenges related to cable loading,
the impact of lighting and storms and the interferences with aircrafts and radars [8]. Wind power
generation is an old technology but a recent trend
in terms of searching for new sources of renewable and clean energy to reduce dependency on
fuel energy, which has enabled to review wind energy in the recent era [45]. In the past few decades,
major and advanced development occurred in the
wind power, especially in the developed countries.
Marine Energy
Marine is more viable and represents an immense source of renewable energy [8, 47]. Marine energy can play a significant role in the energy production to solve the current energy crisis as
well reduce the climate change effect [47÷50]. To
date, the globally installed marine energy is over
530MW and if the undergoing proposed projects
of marine energy are implemented, estimated 750
GW by 2050 will be produced globally [8÷10].
This part examines the overview of sub-categories of marine energy technology which is divided
into seven groups: ocean wave, tidal range, tidal
current, ocean current, ocean thermal energy, salinity gradient and ocean thermal energy conversion [47, 51÷53]. The collective estimated oceans
energy is 20,000 TWh to 80,000 TWh/yr which
is 400% more than the present global energy demand [10]. Most of the technologies to produce
electricity from marine energy are at the early
stage of development except tidal range [51]. Under this section, some short compressive review
of the off shore technologies is reviewed.
Waves Energy
Fig. 8. Vortex Bladeless, Altaeros Energies [8]
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Oceanic waves are the most advance and
developed category. Wave energy contributes
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Fig. 9. Large scale wave energy deployment [10]
significantly to the power generation [51÷54].
Strong wind blows over the ocean surface due to
the temperature and pressure variation; waves are
produced as a result. The waves carry kinetic and
gravitational energies. According to Antonio, [55]
more than 50 types of different technologies are
under development to harvest the energy from the
waves such as oscillating buoys, floating ducks,
snakes, flaps and enclosed chambers. Scientists are
striving for the better improvement and enhancement of the efficiency characterizing the developed
wave’s technology. A study conducted by Mork,
[56] presented that the total theoretical wave energy potential is 32 Pwh/yr which is double the total global energy 17Pwh/yr supplied in 2008 [8].
Regional distribution of the global yearly wave energy potential is shown in the Table 2. Some of the-
Table 2. Wave Energy regional potential [56]
Region
Wave energy potential
(TWh/Year)
Western and Northern Europe
2800
Mediterranean Sea and Atlantic
Archipelagos (Azores, Cape
Verde, Canaries)
1300
North America and Greenland
4000
Central America and South
America,
1500 and 4600
Africa
3500
Asia
6200
Australia, New Zealand and
Pacific Islands
5600
Total estimated regional wave
energy potential
29,500
oretical predicated waves energy has been tested
practically and validated at laboratory scale [57].
Tidal Range, Current and Stream
Tides current is defined as vertical rise and
fall of ocean water. In the marine science, tidal
stream is caused due to the gravity forces between the Earth, the Sun, the Moon and other
plants [58÷59]. Globally, most often oceanic tidal
stream occurred twice a day [10, 59]. Tidal range
is the difference in sea level height between high
and low tide at a given location. Tidal range depends on the geographical location and position
of the Sun and Moon. In contrast, temperature
and pressure variation on the oceans create strong
winds; as a result, the oceanic’s water circulation
produces tidal current. The velocity of tidal and
oceans current is often more than 1m/s which
may produce energy [57]. Generally, two methods to produce energy from the tidal or convert
tidal energy into electrical energy were adopted.
Tidal range has potential to produce energy between high and low tides. The second commonly
adopted method is hydrokinetic energy production from the horizontal flow of tidal current [10].
Tidal current energy potential depends on the
tidal range; the greater tidal range the higher energy can be captured from the tidal current [58].
Global total tidal (stream and range) potential is
estimated at about 3 TW where 1 TW is located
relatively shallow water [59÷60]. There are several factors and hurdles in harnessing tidal energy
like geographical location of the site and environmental constraints. Most of the coastline across
the sea has potential to produce tidal energy [59].
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Fig. 10. Large scale Tidal stream deployment [10]
Ocean Thermal Energy Conversation (OTEC)
Oceans receive a substantial amount of solar
energy, approximately 15% of the total incident
on Earth [8, 10, 47, 52, 57, 61]. The incident solar
energy is stored in the upper layers of the oceans.
Temperature gradient difference can exceed more
than 25°C between the ocean’s surface water at 20
meter depth to the depth of 1000 m [52, 60÷62].
Ocean’s thermal energy conversation (OTEC) is
the process converting the temperature gradient
present between ocean’s surface water to deeper
cold water using various conversation technologies. The OTEC technologies effectively work if
the temperature gradient is 20°C [54]. However,
seasonal effect – summer to winter – changes the
temperature gradient but it is considered as continuously available. The estimated total OTEC
potential is 30-90 PWh [47, 63]. OTEC has proven high cost although open cycle and closed cycle
as well as hybrid OTEC technologies have been
developed and tested in the USA, India and Japan
[8, 57]. Open cycle and closed cycle technology
of OTEC generates desalinated water which can
be used for drinking and irrigation, while cold
water can be used air conditioning. The benefit
of OTEC is that the cold water extracted from the
deep sea is rich with some natural minerals can
be used for agriculture and in the medicine[64].
OTEC has a high capacity factor of 90-95% but
very low efficiency of 7% [65].
Fig. 11. Pressure retarded Osmosis [72]
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Salinity Gradient
Salinity gradient energy (SGE), also known
as blue energy [66], was discovered in 1950s
[67÷68]. Natural mixing of fresh and salt water
produces large amounts of energy gradient [69].
The global potential of SGE is determiend based
on Gibbs free energy equation and presumed to
equal 1.4-2.6 TW.h [70]. Pressure retarded osmosis (PRO) and reversed electro-dialysis (RED) are
the methods used in SGE. Pressure retarded osmosis (PRO) technology of salinity gradient energy was introduced by Norwegian energy company [71]. Under the chemical process water of
dilute solution flows toward higher concentrated
solution, the movement of two different solutions produces gradient; as a result, turbines rotate and transform the mechanical energy into the
electrical energy [66÷69]. First pressure retarded
osmosis (PRO) plant energy producing capacity
of 5kw was opened in 2009 at Tofte, Norway but
closed operation due to a technical fault [57, 72].
Reversed electro dialysis (RED) plant was open
in 2014 at Afsluitdijk the Netherland but due to
membranes damaging, impurities in sea water and
difficulties in filtration, the plant was closed. The
developed technologies are underpinning to some
serious issues addressed by engineers and future
studies are recommended to overcome the challenges mentioned by the recent studies of [66÷68].
MICRO ENERGY
The contribution of renewable energy is far
slower than the non-renewable energy consumption [73÷74] where the potential to generate renewable energy is large [8, 10, 73, 75]. In the era
of technological war of rapid growth, especially
mobile electronics consuming micro level energies increase in the quantities and may consume
large amount of energy. Micro level renewable
energy constitutes an alternative to the macro
energy resources, which needs heavy investment
and long planning [75÷76]. Self-powered technique is used to harvest the energy from the surrounding environment such as thermal variations
within the body create light, thermal gradient,
pressure gradient, air flow, vibration, motion radiofrequency or electromagnetic radiation are the
example of micro scale energy harvesting. Selfpowered energy harvesting is a growing interest
to the research community facing many chal-
lenges and limitations in the design. The energy
generated from the solar radiant is found the best
among all others and is clean, eco-friendly and
infinite source of energy [1, 8, 73, 76÷83].
Vibration
Likewise other sources of energy waste vibration create energy which can be usefully converted to electrical energy and can replace small
batteries use for sensors or wireless communication devices [84÷85]. Three main causes of vibration are seismic vibration, acoustic vibration and
vibration caused by the application of load [84].
Seismic vibration is caused by the human walking, vehicle traffic and wind blowing, etc.. Human
motion and others sources of vibrations have the
potential to produce energy and can be harvested.
The magnitude of the vibration energy depends
on the frequency and amplitude of the vibration
[84÷89]. The mechanism of energy harvesting
from the vibration using electrostatic, piezoelectric and electromagnetic transduction was recognized [84, 90]. Beeby, [91] developed a electromagnetic energy harvester which consists of a coil
and a silicon wafer cantilever beam, with four pole
magnets as its proof mass. Roundy, [92] developed piezoelectric to harvest micro scale energy
from the vibration sources. Using the vibration
energy harvesting concept Minazara, [93] developed a piezoelectric generator and installed it in
the handlebar of bicycle to convert the available
mechanical energy and power the LED lamp of
the bicycle. Human body, especially while walking, has a potential to produce energy [84, 88, 89,
90, 94]. The kinetic energy from human walking
can be harvested and converted to electrical energy [85÷94]. The benefit of energy harvesting from
vibration is not only useful for batteries recharge
or replacement but also reduces the cost of the batteries and maintenance. Moreover, it minimizes
the power consumption also has a positive influence on the environment. Many studies conducted
on vibration and motion energy and have attracted
the researchers’ attention in the area of micro scale
vibration and motion energy. Wei, [84] listed and
compared the maximum potential output among
piezoelectric, electromagnetic and electrostatic
vibration energy harvesting techniques with the
maximum output energy 2.45e-5 μW to 2.7e4 μW.
It was concluded that vibration and motion have
potential to harvest and convert mechanical/kinetic energy into electrical energy on a micro scale.
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Radio Frequency
The environment is filled with radio frequencies (RF) generated from various wireless devices
such as mobile tower, radio, television, satellite
orbiting earth and mobile phone [95÷96]. Radio frequency (RF) energy transmitting from the
wireless medium can be harvested or recycled
from the ambient [97÷98]. A large amount of
RF energy involves transmitting but only small
amount can be harvested in real time, while the
rest absorbed by the other materials or dissipates
in heat energy [97]. Like in the case of other
sources available in the environment and helpful
for the production of free energy, RF energy is
also available in large quantities and has potential to generate electrical energy [99÷100]. The
mechanism of radio frequency energy harvesting consists of a receiving antenna, matching circuit, frequency detector and electric voltage. The
function of antenna is to receive electromagnetic
waves using a matching circuit to amplified voltage and the system capable of converting radio
frequency into direct current. The maximum theoretical power of RF energy harvesting is 7.0µW
and 1.0µW for 2.4GHz and 900MHz frequency,
respectively, for free space distance of 40 meters
[97, 101]. According to Le, [102] signals path
loss will be different depending on the capturing
environment, in contrast to free space environment. Antenna plays a significant role in the RF
energy harvesting. The output or the efficiency of
RF energy harvesting highly depends on antenna size, mass and design [96÷102]. In the urban
populated regions, different types of radio waves
are freely available. These waves carry abundant
energy which can be harvested using the RF energy harvesting techniques [95]. Literature showed
sufficient data on the RF energy harvesting potential. The RF energy harvesting has opened new
research opportunities for wireless and networking communication to harvest energy and use for
the devices that need micro energy in the range of
(10-3-10-6)[97÷99].
Air Flow
At present, world is full of well-developed
microelectronic technologies [95] and micro
energy harvesting has successfully attracted attention [103÷104]. The airflow from the air
conditioning equipment in the buildings can be
harvested and wind turbine technology is one
approach to harvest the airflow [105÷107] . Re98
searchers were able to draw the output of micro
wind turbine as Federspiel, [108] has designed
10.2 cm diameter fan rotor at air velocity 2.5 m/s
output 8mW energy produces increasing air velocity 5.1 m/s, respectively, which has increased
the energy to 28mW. Study of Rancourt, [109]
reduced the size of rotor fan to 4.2 cm diameter
output obtaining 2.4mW at 5.5 m/s air velocity
and 130mW at 11.8m/s. Howey, [110] designed
a rotor fan of 1.5 cm2 and 4.3mW energy was
produce at airflow velocity of 10 m/s as a result.
Generally, the power harvested from the airflow
mechanism depends on the air/wind velocity,
wind density and fans curve area of interaction
with air [106, 107, 110, 111].
The power generated using airflow technique
is measured as:
(1)
Pout= ½ ρAV3 ηgCp
Where: Pout is the converted electrical energy
(W), A is the area of wind turbine (cm2),
ρ air density kg.m-3, ηg is the efficiency
of generator, Cp is the theoretical limit
and Cp is less than 0.59 as in 1919, Albert
Betz determined that a wind turbine cannot convert more than 59% of the kinetic
energy of the wind [112÷114]. Hence, its
micro level airflow energy is expected
to have lesser Cp value. Literature studies indicated that the maximum efficacy
achieved using micro wind turbine is 10%
[110÷115]. In order to increase the air
generator performance efficiency Carli,
[116] established a buck-boost converter.
As a result, the result generator efficiency
has increased. A study found that the airflow micro energy can be harvest using
the wind turbine technique [117]. In majority, future studies focus on increasing
the efficiency of airflow energy.
Thermal Energy/ Thermoelectric Energy
Our surroundings are full of many sources
which generate natural temperature gradient between 10°C to 100°C like vehicle exhausts, fossil
fuelled power generation, petrochemical plants,
metals melting, glass and paper manufacturing,
etc. The generated temperature gradient can be
harvested to convert electrical energy conditionally [118÷121]. Electric/energy potential present due
to the temperature gradient between two bodies is
known as thermoelectricity [122]. Thermoelectricity is available into two forms temperature gradi-
Advances in Science and Technology Research Journal Vol. 13(1), 2019
ent or temperature time-variation. Thermoelectric
effect and pyro-electric effect are two methods
to generate electrical energy from the thermal
energy [122÷124]. In the method of thermoelectric energy harvesting, temperature is maintained
through temperature gradient in the material and
electrical energy is produced [125]. Thermoelectric energy produces via three different effects: the
seebeck effect, the Peltier effect and the Thomson
effect which is reversible in the thermodynamics
[124÷127]. Seebeck is among the most common
and interesting effects of thermal electric effect
which produce the electrical energy due to the difference of temperature in the body. Thermoelectric generator or Seebeck effect was introduced
by Thomas Johann Seebeck in 1821 to convert
direct temperature gradient into electrical energy
[126÷128]. A study quoted by Chalasani and Conrad [122] stated that Seebeck heat pump was designed by Sodano [129] to convert the temperature
gradient available in the electrical power. Rowe,
[130] developed large thermoelectric generator
with the capacity of 100 watts and produced electrical energy from the hot waste water. Numerous
studies were conducted to improve the efficiency
of thermoelectric generator, as the current efficiency of TEG is less than 10% [123, 131÷132].
Pyroelectric energy harvesting is dependent on
temperature time variation. In the contrast to thermoelectric energy, the pyroelectric energy does
not need temperature gradient to convert thermal
energy into electrical energy [123, 133, 134].
The phenomenon of pyroelectic energy is
described when some materials generate electrical charge when heated. As a result of heating,
the atoms of the material slightly change the
position within the structure and polarization
occurs. The polarization change of the material produces voltage in the material. Thus, the
generated voltage can be converted to electrical
energy within the temperature change variation
[123, 135]. Early theoretical studies on the pyroelectric energy were conducted by Clingman,
[136] and Hoh, [137]. A study of Gonzalo, [138]
suggested that the pyroelectic material efficiency can increase up to 4.0% by selecting proper
material [139]. Ferro-electric transitions were
found best for pyroelectric energy harvesting
over small temperature variation, also increasing
the efficiency [140÷142]. In conclusion, thermoelectric and pyroelectric methods have potential
to produce and harvest micro energy by means
of temperature gradient and real time temperature variation in the materials.
Solar Energy Harvesting on Road Pavement
The energy generated from the solar radiant was found the best among all others and is
clean, eco-friendly as well as constitutes an infinite source of energy [1, 8, 27, 28, 30, 32 33, 77,
78, 82]. There are various methods to produce
solar energy, such as photo thermal, photovoltaic, photochemical and photo- biological con-
Fig. 12. Asphalt pavement energy harvesting technologies
99
Advances in Science and Technology Research Journal Vol. 13(1), 2019
versions [33, 78, 143]. A new paradigm of the
utilization of asphalt pavement as a solar collector includes the addition to self-powered energy
harvesting and is categorized into two types solar radiation and vehicle load [73, 77, 144]. Daily, asphalt pavement received enormous amount
of sun heat which get dissipates into the environment. Past studies found that bitumen asphalted surface may heat up to 70°C in summer by
the direct solar radiation [73, 77, 83, 144÷150,
168]. High temperature accelerates the thermal
oxidation of asphalt pavement; hence, structural
failure occurs and pavement performance is reduced [77, 151, 152].
Numerous studies focused on the asphalt solar
collector (ASC) where the first and most important part covered is variation in the temperature
of the outer and inner surface of the asphalt pavement at various depths followed by the embedded
pipe material and arrangement. Formerly, metallic pipes made of steel; copper and iron were used
due to high conductivity. However, high cost, corrosion and rigidity of the metallic pipes caused
structural damages. Beside high potential of solar
radiation collection asphalt pavement has high
albedo rates at night and day time. Water is the
most abundantly available fluid and best used in
embedded pipes [77, 146÷160].
However, the solidification temperature of
the circulating liquid should be lower than the
expected lowest temperature of fluid as in some
cases temperature drop below the freezing point
and water can freeze in the embedded pipes and
cause damage [153]. The arrangement of pipes is
also an important parameter in asphalt solar collector (ASC) and the ongoing research studies
also focus on the arrangement of the pipes, but
literature shows that the parallel and serpentine
arrangements have followed. Up to some extent,
the serpentine arrangement was found more efficient than the parallel [147÷148, 158÷159].
cept but lower efficiency is the main drawback
[163÷164]. Experimental study conducted by
Mallick,[161] implanting the TEGs into the asphalt pavement obtained the maximum power
output of 5W but did not calculate the efficiency.
Wu and Yu, [165] implanted TEGs in the asphalt
pavement surface. The maximum output efficiency was calculated as 4% using Quantum Well
structured (QW) materials. The efficiency of the
TEGs is associated with the temperature gradient,
the higher is the thermal gradient the more energy
is generated and TEGs shows higher efficiency
[135, 162, 163, 166, 167].
Induction Heat
Asphalt itself is not an electrically conductive
material but in the cooperation with other electrically conductive material that can be added to
mixture, heating may be induced [168÷169]. The
conductive material produces heat based on the
Joule effect equation:
(2)
P = R.I2.t
Where: P is the heat generated, R is the material
resistance, I the current and t the time of
exposure to the magnetic field [170]. Selfhealing of the asphalt pavement against
permanent deformation and minor or major cracks appearing in the asphalt pavement can occur if no more is applied to the
surface that has been cracked [171÷173].
The electrically conductive material incorporation with pavement material can
induce heat energy by solar irradiation
and this energy can be harvest. The energy is induced using a conductive material in asphalt pavement to cope with the
problem of cracks appearing in asphalt
pavement to encourage self-healing techniques [155, 168÷173].
Asphalt Solar Collector (ASC)
Thermoelectric generators (TEGs)
In order to avoid the waste of micro thermal
energy created within body, the thermoelectric
generators (TEGs) technology has been introduced. TEGs implant between two heat exchangers which directly convert the heat energy into
electrical energy due to the Seebeck effect [156,
161÷162]. Utilization of thermoelectric generators (TEGs) in the road surface to collect waste
heat energy through Seebeck effect is a new con100
Asphalt solar collector can be traced back to
the year 1979 when it was patented by Wendal
in the United States [174]. The purpose was deicing and melting snow during the winter snowing period. Moreover, to ensure road safety and
smooth traffic flow especially on the bridges,
ramps and road bends. Asphalt solar collector (ASC) was expended into hydronic asphalt
pavement and solar air chimney method has
been developed recently.
Advances in Science and Technology Research Journal Vol. 13(1), 2019
Hydronic Asphalt Solar Collector (HASC)
Hydronic asphalt solar collector heat collection occurred in the pipes embedded underneath
the wearing course which contains liquid (water or
any other liquid). In the day light, the road surface
temperature increases and temperature gradient
between the fluid circulating in the pipes below
the pavement surface is produced. The convection occurred where heat is transferred from the
solid surface to the flowing liquid in the pipes and
paved surface temperature decreases in the result
of temperature stored in the flowing water. The
store heat energy can be converted into thermal
energy [77, 161, 170, 175]. The Solar Energy Recuperation from the Road Pavement (SERSO) installed a hydronic asphalt solar collector (HASC)
in Switzerland for the purpose of de-icing the
snow from the bridge [73, 77, 175]. HASC was
commercially applied by Road Energy System
in Netherland to melt snow and harvest energy
[176]. The use of hydronic asphalt solar collector (HASC) for snow melting was the subject of
many studies and recently some companies have
commercialized it, such as Dutch Ooms international holding with Road Energy System® (RES),
WinnerWay, ICAXTM and Woecester Polytechnic
Institute has a developed solar asphalt collector
cited by [77, 150]. Studies focus on increasing
the potential of hydronic asphalt solar collector
by using different conductive materials. The major concern or drawback is the cracking appearing
in the asphalt or the asphalt strength which can be
improved using a polymer-modified bitumen as
the previous result indicated that polymer-modified asphalt increases the strength of the asphalt
pavement [177÷178].
Solar wind Turbine
Recently, convection-powered air flow technique has been introduced by Garcia & Partl [155]
to manage the asphalt pavement temperature. The
system of solar updraft towers and solar chimney
consist of pipes embedded in paved surface. The
air heated on the paved surface during day time
creates an updraft air through the chimney [155,
178]. Air convection occurring in the chimney allows wind turbine to produce electrical energy. In
addition Garcia & Partl, [155] concluded that the
air flowing through the embedded pipes in asphalt
pavement can heat up and cool down up to ±5°C
and a significant reduction on the road surface
temperature has been observed.
Additionally, the efficiency of solar wind turbine was studied versus the height of the chimney.
The optimum height depended on the pipe material the chimney is made of but for the PVC chimney, 1m to 1.5m gives the maximum efficiency.
The longer the height of chimney, the greater heat
loss may be, in the contrast to the shorter chimney
in which the air flow is very slow [155]. The subject of solar wind turbine in asphalt road has wide
opportunity for study in the future; till now, only
one study has conducted.
CONCLUSION
Energy is the key contributor to human basic
needs; importantly, the economic growth of the
country is highly dependent on the energy. Yet,
fossil fuels are among the top sources of energy.
In the past two decades, unprecedented changes
in the consumption of fossil fuel energies had a
drastic impact on the environment. As a result,
the trend of investment in the renewable clean
eco-friendly energies has grown worldwide. Nature can inspire innovative solutions for future
energy systems and technology design. This paper confirmed the global resource of macro and
micro energies potential in the current scenario.
Amongst the renewable energy resources,
hydro energy is dominant with 71% global supply in 2015. Approximately 10,000 TWh/Year
of unutilized hydropower energy potential exists
worldwide. Bioenergy plays a significant role in
reducing the greenhouses gases and corresponded
to 10% global renewable energy resources supplies. The electricity produced from the bioenergy constitutes the third largest renewable energy
resource. Recently, waste disposal has become
the greatest challenge worldwide. Scientists confirmed that recovery of heat energy or electricity
from the waste was found among the most appropriate methods to solve the waste issues. Waste
plastic products followed by papers, textiles and
other waste organic materials have a high potential for reuse and produce energy. The review
concluded that our planet has an infinite source of
solar energy which radiates more energy than the
consumed annually by the world population and
has the highest potential to produce renewable
energy. Recent development shows that the global contribution of solar energy to the renewable
energy accounted for 1.0%. The Earth’s natural
heat reserves are immense and geothermal energy
101
Advances in Science and Technology Research Journal Vol. 13(1), 2019
has the highest capacity factor of 90% over other
renewable energy technologies. Geothermal energy can play an important role in the countries
that have potential like Indonesia and Turkey and
USA, i.e. the leading countries producing geothermal energy. Wind power generation is an old
technology but recently has attracted significant
attention in terms of renewable energy production. Advanced development has occurred in the
wind power harvesting technologies to overcome
the wind speed and environmental challenges. An
alternative design without rotor blades and the
new Google Makani project to produce electricity
from the wind were discussed. Demark produces
the highest amount, i.e. 42% of wind power, followed by Germany with 13%. Marine energy is
an immense source of renewable energy and has
a potential to play significant a role in the production of clean energy. Marine energy is categorized
into seven sources including ocean wave, tidal
range, tidal current, ocean current, ocean thermal
energy, salinity gradient and ocean thermal energy conversion. Each source of marine energy
plays a significant role and has potential but most
of them are at the early stage of development.
The contribution of renewable energy resources is far slower than the energy produced
from fossil fuels. Rapid development of technology and acceptance among the people, especially
mobile devices consume micro energies. Selfpowered techniques used to harvest energy from
the surrounding environment such as thermal
variations within the body create light, thermal
gradient, pressure gradient, air flow, vibration, radiofrequency or electromagnetic radiation. Each
source of micro energy is well explained in the
section above. Micro energy can be harvested
from the waste vibration or thermal gradient present between two bodies. The study recommended
the utilization of macro and micro energy resources which have huge potential to reduce the
dependency on the fossil fuel will also help to reduce the environmental pollution.
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