Review of solar photovoltaic/thermal (PV/T) air collector

International Journal of Electrical and Computer Engineering (IJECE)
Vol. 9, No. 1, February 2019, pp. 126~133
ISSN: 2088-8708, DOI: 10.11591/ijece.v9i1.pp126-133  126
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Review of solar photovoltaic/thermal (PV/T) air collector
Ahmad Fudholi1
, Mariyam Fazleena Musthafa2
, Abrar Ridwan3
, Rado Yendra4, Hartono5
, Ari Pani
Desvina6
, Majid Khan Bin Majahar Ali7
, Kamaruzzaman Sopian8
1,2,8Solar Energy Research Institute, Universiti Kebangsaan Malaysia, Malaysia
3Prodi Teknik Mesin, Fakultas Teknik, Universitas Muhammadiyah Riau, Indonesia
4,5,6Department of Mathematics, Faculty of Science and Technology, Universitas Islam Negeri Sultan Syarif Kasim
(UIN Suska) Indonesia
7School of Mathematical Sciences Universiti Sains Malaysia, Malaysia
Article Info ABSTRACT
Article history:
Received Jan 27, 2018
Revised Jul 4, 2018
Accepted Jul 27, 2018
Growing concern with regard to energy sources and their usage has
consequently increased significance of photovoltaic thermal (PV/T)
collectors. A PV/T air collector is a system which has a conventional PV
system combined with a thermal collector system. The system is able to
produce electrical energy directly converted from sunlight by using
photoelectric effect. Meanwhile, it also extracts heat from the PV and warms
the fluid (air flow) inside the collector. In this review, solar PV system and
solar thermal collectors are presented. In addition, studies conducted on solar
PV/T air collectors are reviewed. The development of PV/T air collectors is a
very promising area of research. PV/T air collectors using in solar drying and
solar air heater.
Keywords:
Energy analysis
Exergy analysis
PV/T efficiency
Renewable energy
Copyright © 2019 Institute of Advanced Engineering and Science.
All rights reserved.
Corresponding Author:
Ahmad Fudholi,
Solar Energy Research Institute,
Universiti Kebangsaan Malaysia,
43600 Bangi Selangor, Malaysia.
Email: a.fudholi@gmail.com
1. INTRODUCTION
Solar energy is the radiation produced as a result of the nuclear fusion reactions in the sun. This
energy is radiated from sun in all directions. The solar energy from sun when beamed onto Earth for even an
hour is sufficient to produce the global energy need for an entire year. Many technologies exist to harness the
energy from sun and use it in application. The energy harnessed from sun can be used in two different forms;
thermal and electrical. One such technology which utilizes radiation from solar energy to produce electrical
and thermal energy is Solar PV/T technology and the device used in this technology is called a Solar PV/T
collector. Solar PV/T collector is a hybrid system that deploy solar PV technology and solar heater
technology. When a photovoltaic system is irradiated with solar energy, the cell temperature increases
prominently. The greater the temperature difference between ambient temperature and temperature of the cell
is, the less efficient the electrical efficiency and electrical output of the PV module becomes. In order to
enhance the electrical efficiency, this excess heat is extracted by passing a heat extracting fluid (air or water)
under the module. This integrated method, where electrical and thermal energy are generated simultaneously,
is the basis of PV/T collectors [1]-[9].
The overall performance of the PV/T air collector can be evaluated based on the thermodynamic,
environmental and economic impacts analysis. Enviroeconomic and exergoeconomic analyses for PV/T air
collectors was studied [10]. Energy-exergy-economic-environmental analyses for different PV/T array
systems was studied [11]. In this review, thermodynamic aspect is focused involving exergy analysis. Exergy
has the characteristic that it is conserved only when all processes of the system and the environment are

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Review of solar photovoltaic/thermal (PV/T) air collector (Ahmad Fudholi)
127
reversible. Exergy is destroyed whenever an irreversible process occurs when an exergy analysis is
performed on a system like PV/T system, the thermodynamic imperfections can be quantified as exergy
destruction, which is wasted work or wasted potential for the production of work. By analyzing the exergy
destroyed by each component in a process, it can be easily identified where the focus should be given to
improve system efficiency. Exergy analysis is conducted by utilizing the first and second law of
thermodynamics. Exergy analysis has become an essential tool in the system design, analysis, and
optimization of thermal systems [12-20].
2. RESEARCH METHOD
The system which converts sunlight into electrical current by means of a photovoltaic (PV) cell is
known as PV system. The process by which the PV cell converts sunlight to electrical current is called
Photoelectric effect. Sunlight consists of photons. Billions of these photons continues to hit the earth every
second. These photons contain large quantities of energy corresponding to the different wavelengths of the
solar spectrum. When photons strike a PV cell, they are either reflected, absorbed, or passed through.
Electricity is generated by the photons that are absorbed.
The photons with energy greater than the band-gap energy of the semiconductor when absorbed
creates some electron-hole pairs proportional to the incident irradiation. When such a photon is absorbed, the
energy of that photon is absorbed by an electron in an atom of the semiconducting material of the PV cell.
With the added energy, the electron can escape from its normal position (valence band) in the atom to
become free by jumping to the conducting band leaving a hole behind. The electrical circuit is completed by
the flow of these electrons and holes using electrodes. As millions of photons hits the PV cell, millions of
electrons gain energy and become free to move along the conducting wires. Solar cells and modules consists
of thin conducting wires and a built-in electric field to provide the voltage needed to move the current
through an external load. The small quantity of current produced at each cell can be significantly increased
by connecting several cells together and kept on large [21].
The PV system may include major components as; DC-AC power inverter, battery storage, system
and battery controller, back-up energy sources and electrical loads [22]. The Figure 1 shows the main
components of a Solar PV system. PV cells are the basic unit which converts the sunlight to energy. A PV
module consists of PV cells arranged in frame to form a module. A PV module is constructed by connecting
PV cells in series for high voltage and in parallel for high current. By connecting series of PV modules, a PV
array is formed. The inverter is a device which converts direct current (DC power) into standard alternating
Current (AC power) which can be used for the appliances in the home, synchronizing with utility power
whenever the electrical grid is distributing electricity [23].
The charge controller regulates the flow of electricity from the PV modules to the battery and the
load. It enables the battery to be fully charged without overcharging. When the load is consuming power, the
controller allows electricity to flow from the modules into the battery or the load. When the battery is full the
controller senses that and stops the flow of charge from the modules. At night time, and/or if the demand
exceeds the power produced from Solar PV during the day and battery, electricity is provided through utility
power source. The utility meter spins backwards when solar power production exceeds house demand. This
allows the user to credit any excess electricity in future utility bills [24]. The storage battery is used to store
any excess energy produced by PV modules and deliver it back for consumption when in demand [25].
Figure 1. Schematic of PV system
Generally, PV systems can be classified based on their function and operational needs, their
component configuration and the way other power sources and appliances are connected to the PV system.
There are three types of solar PV systems. Stand-alone system or off-grid systems are systems which
generate power and consume the power generated within the system and does not interact with the main
electrical grid.
PV array
Charge
controller
Battery
DC/AC
Inverter Loads

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In a hybrid system, in addition to solar energy, one or more source of energy is hybridized in the
solar PV system such as such as wind, biomass or diesel to provide the required power. This increased the
reliability and efficiency in a cost effective way [25].
3. SOLAR THERMAL COLLECTORS
A solar thermal collector converts solar energy into useful thermal energy which is then transferred
to the working fluid flowing through the collector such as water and air. The thermal energy collected can be
used for various applications such a water or space heating, to generate steam. It can also be stored in a
thermal storage for later use. Based on the working principle and other factors, solar thermal collectors can
be categorized in various ways. One of the common categorization is (i) non-concentrating (for example, flat
plate collectors) and (ii) concentrating (for example, compound parabolic concentrators). Another common
way to categorize it is based on the working fluid (heat transfer fluid) used inside the collector as heat
extraction such as into liquid heating and air heating types. For applications at low to medium temperature of
about 100oC, the type of solar collectors that are usually used is stationary collectors which do not use solar
tracking mechanism. They are generally used for air and water heating applications. Whereas concentrating
collectors which use solar tracking system is commonly used for applications at medium to high temperature
of about 200-2500oC such as solar thermal power generation and high temperature heating [1].
The main difference in the design of flat plate air collector from water collector is air plate
collectors lack the flow tubes that are attached to the absorber plate. The main parameter to enhance the
performance of solar air collector is the heat transfer rate between the absorber surface and the flowing air. In
order to achieve this objective, various modification have been proposed in the design and air movement in
solar air collectors including the use of corrugated, finned absorbers and multiple-pass air flow
configurations as shown in the Figure 2.
Figure 2. Different air flow designs for solar air collectors
The thermal efficiency of solar thermal collectors is a ratio of the useful thermal energy, 𝑄 to the
overall incidence irradiations, 𝐼. Where the heat collected by the flat plate air collector can be measured by
result of average mass flow rate,ṁ heat capacity of flowing medium, 𝐶 and a temperature difference of the
medium at the collector inlet, 𝑇 and outlet, 𝑇 [26]-[29].
𝜂 =
𝑄
𝐼
=
ṁ𝐶 (𝑇 − 𝑇 )
𝐼

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4. SOLAR PV/T AIR COLLECTORS
In 1978, Kern and Russel introduced the concept of PV/T collectors using water or air as a heat
removal fluid. As such PV/T collectors can be classified into three categories based on the type of working
fluid used. Namely, PV/T water collector, PV/T air collector, and PV/T water/air combination collector [30].
Due to the dual functions of a PV/T collector, this type of collectors maximizes the use of solar energy
resulting in a higher overall solar conversion rate than that of solely PV or solar collector. The PV cells
composed of semiconductor material convert highenergy photons of incident solar radiation into electricity.
The lower energy photons are absorbed by the PV panel and generate heat within the cells [31]. The
generation of heat within the cell reduces the efficiency of the cells.
The photovoltaic thermal (PV/T) technology extract a great percent of this heat and utilize it for
practical applications. The removal of heat from the cell and transferring it to the working fluid increases the
electrical efficiency of the PV module while simultaneously producing hot fluid which can be used for
thermal applications. Since PV/T offers an improved method of utilizing solar energy, the overall efficiency
of the system is higher. The major advantages of using PV/T is as follows [32]: (i) It is dual-purpose: a
system which can be used to produce thermal and electricity output, (ii) It has a wide application: the thermal
output can be used for drying, heating and cooling (desiccant cooling), (iii) It is flexible and efficient: the
combined efficiency is always much higher than using two individual systems and is especially attractive
when roof-panel spacing is limited, and (iv) It is practical and cheap: it can be easily integrated to building
with minor modification. Furthermore, by replacing the roofing material with the PV/T system, the payback
period can be reduced.
Recently, Fudholi et al. [33] studied theoretical and experimental of PV/T air collector with
▽-groove. They reported that PV/T exergy efficiencies of were 12.66-12.91% and PV/T energy efficiencies
were 31.21-94.24%. The thermal and PV efficiency was 21.3-82.9% and 9.87-11.34% respectively. In 2016,
Hazami, et al. [34] studied theoretical and experimental of PV/T air collector using energy and exergy
analysis. They reported that PV/T exergy efficiencies of was 14.8%. From energy analysis, the PV and
thermal efficiency was 15% and 50% respectively. Slimani et al. [35] studied theoretical and experimental of
PV/T air collector for an indirect solar dryer. They reported that PV, thermal and PV/T efficiencies were
10.5%, 70% and 90%, respectively. Gholampour and Ameri [36] studied energy and exergy analysis of PV/T
flat transpired collectors based on theoretical and experimental study. They reported that PV/T exergy
efficiencies of was 8.66%. From energy analysis, the thermal and PV/T efficiency was 69.9% and 55%
respectively. In 2015, Li, et al. [37] studied theoretical and experimental of PV/T air collector in the hot
summer and cold winter zone. They reported that PV, thermal and PV/T efficiencies were 11.9-12.4%, 50%
and 77.7%, respectively.
Researchers [38]-[40] studied experimental PV/T air collector. Rajoria et al. [38] reported that PV
and thermal efficiencies were 3.1-9.1% and 12.1-28.1% respectively. Ahn et al. [39] reported that PV,
thermal and PV/T efficiencies were 15%, 23% and 38% respectively. Good et al. [40] reported that PV and
thermal efficiencies were 17.4% and 71.5% respectively. Amori and Abd-AlRaheem [41] studied
experimental (field) of various PV/T air collectors. They reported that PV and thermal efficiencies were
8.3-10.4% and 46-62% respectively. In 2013, Rajoria et al. [42] studied theoretical and experimental of PV/T
air collector. They reported that PV/T energy and exergy efficiencies of were 11.3% and 16.3%, respectively.
In 2012, Agrawal et al. [43] studied theoretical and experimental of PV/T air collector connected in series.
They reported that PV and thermal efficiencies were 12.4% and 35.7% respectively. Amori and
Al-Najjar [44] studied theoretical of thermal and electrical performance for PV/T air collector in Iraq. They
reported that PV, thermal and PV/T efficiency were 9-12.3%, 19.4-22.8% and 47.8-53.6% respectively.
In 2010, Agrawal and Tiwari [45] studied energy and exergy analysis of PV/T air collector under cold
climatic conditions. They reported that PV/T energy efficiency was 53.7%. Sarhaddi et al. [46] [47] studied
energy and exergy analysis of PV/T air collector. They reported that PV, thermal and PV/T efficiency were
10%, 17.18 and 45% respectively. PV/T exergy efficiency was 10.75%. Agrawal and Tiwari [48] studied
theoretical and experimental of PV/T air collector. They reported that PV and thermal efficiency were 7.13%
and 33.54% respectively.
5. CONCLUSION
Based on the present review, the following conclusions can be drawn: a) A number of research have
been done on PV/T air collectors over the last four decades, exploring aspects such as efficiency
enhancements by design development, numerical simulation, prototype design, experimental testing and
testing methodologies for PV/T air collectors; b) The energy and exergy efficiency of PV/T air collector were
31% to 94% and 8.7% to 18%, respectively; c) The development of PV/T air collectors is a very promising
area of research. Today, PV/T air collectors using in solar drying and solar air heater.

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ACKNOWLEDGEMENTS
The authors would like to thank the UKM and UIN Suska Riau for funding (GP-K020448) and
(GGP-2017-045).
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BIOGRAPHIES OF AUTHORS
Ahmad Fudholi, Ph.D, M.Sc obtained his S.Si (2002) in physics. He was born in 1980 in
Pekanbaru, Indonesia. He has working experience about 4 years (2004-2008) as Head of Physics
Department at Rab University Pekanbaru, Riau, Indonesia. A. Fudholi started his master course
in Energy Technology (2005-2007) at Universiti Kebangsaan Malaysia (UKM). His M.Sc thesis
was on Wind/PV Hybrid System and the Ph.D thesis was about the Finned Double-Pass Solar
Collectors for Drying of Seaweed. His M.Sc and Ph.D thesis under supervisor by Prof Dato’ Dr.
Kamaruzzaman Sopian. After his master he became Research Assistant at UKM up to 2012.
After his Ph.D (2012) in renewable energy, he became Postdoctoral in Solar Energy Research
Institute (SERI) UKM up to 2013. He joined the SERI as a Lecture in 2014. More than USD
310,000 research grant (15 grant/ project) in 2014–2017 was involved. More than 25 M.Sc
project supervised and completed. Until now, he managed to supervise 5 Ph.D (4 main
supervisors and 1 Co. supervisor), 3 Master’s student by research mode, and 5 Master’s student
by coursework mode, he was also as examiner (3 Ph.D and 1 M.Sc). His current research focuses
on renewable energy, especially solar energy technology, micropower system, solar drying
systems, and advanced solar thermal systems (solar assisted drying, solar heat pump, PVT

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systems). He has published more than 120 peer-reviewed papers, which 25 papers in ISI index
(20 Q1, impact factor more than 3) and more than 60 papers in Scopus index, 16 more currently
accepted manuscript, 20 more currently under review, and 2 book chapters. Addition, he has
published more than 70 papers in international conferences. His total citations of 810 and h-
index of 14 in Scopus (Author ID: 57195432490). His total citations of 1387 and h-index of 20
in google scholar. He is appointed as reviewer of high impact (Q1) journals He is appointed as
reviewer of reputation journals. He is also appointed as editor journals. He has received several
awards (Gold, Silver and Bronze) Medal He was also invited as speaker: Workshop of Scientific
Journal Writing; Writing Scientific Papers Steps Towards Successful Publish in High Impact
(Q1) Journals. He has 1 patent and 2 copyrights.
Mariyam Fazleena Musthafa, M.Sc from Maldives. She graduated with the M.Sc (2017) in
Energy Technology from Universiti Kebangsaan Malaysia (UKM), Malaysia. The M.Sc
dissertation was about the Exergy Analysis of Photovoltaic Thermal (PVT) Air Collector. Her
M.Sc thesis under supervisor by Ahmad Fudholi, Ph.D. Upon graduation her current research
focuses on solar energy technology.
Abrar Ridwan, S.Si, ST, MT is the head of centre of applied technology, head of mechanical
engineering laboratory and a lecturer at Muhammadiyah University of Riau. His research interest
includes combustion engineering, biomass gasification, energy conversion and solar energy. He
was graduated from physic department of Brawijaya university and also in mechanical
engineering at Muhammadiyah University of Malang (UMM). Since 8 years of his lecture was
granted by Research and Technology Ministries of Indonesia (RistekDikti) for his research
project. He is also involved in the UNDP-UNFCC program regarding municipal solid waste
project in Riau Province and graduated his master of mechanical engineering from University of
Indonesia. Currently he is focusing the research of how to optimize solar updraft power
generator with any material as its heat storage.
Dr. Rado Yendra, M.Sc was born in Indonesia in 1977. He received Ph.D. degree in Statistical
Science from The National University of Malaysia, Malaysia in 2014. He joined the Department
of Mathematics from the State Islamic University of Sultan Syarif Kasim Riau, Indonesia and
2015 became a Vice-Dean from Faculty of Science and Technology. His main areas of research
interest are statistical science and data mining.
Prof. Dr. Hartono, M.Pd from Pekanbaru, Indonesia. He is currently, a Professor at Faculty of
Science and Technology, Universitas Islam Negeri Sultan Syarif Kasim (UIN Suska). He is
Dean of Faculty of Science and Technology, UIN Suska Pekanbaru Riau, Indonesia. He was the
Head, Department of Mathematics Education (2001-04); Deputy Dean, Faculty of Education
(2004-13). His main contributions are in research methodology, statistical and as Training of
Trainer. His major research efforts include designing E-learning, education method and
education strategy. He has published more than 15 books in the field of education, statistic,
analysis software, SPSS and general interests.
Ari Pani Desvina, S.Si, M.Sc from Indonesia. She graduated with the M.Sc in Statistical
Science from The National University of Malaysia, Malaysia in 2010. She joined as lecturer at
the Department of Mathematics, Faculty of Science and Technology, Universitas Islam Negeri
Sultan Syarif Kasim (UIN Suska) in 2006. Carenntly, she is head of Mathematics Department
of UIN Suska Riau, Indonesia.

133
Dr Majid Khan joined the School of Mathematical Sciences, USM, as a lecturer (Operational
Research) in May, 2017. He is a researcher and appointed fellow working in the field of seaweed
cultivation, solar drying systems, processing, modelling and simulation. His research uses
application of Iot, big data and simulation methods to improve model predictions of moisture
losses during drying in control and uncontrolled environment. He is also interested in modelling
the problems in engineering and other biological systems such as tissue culture and aquamarine.
He uses the techniques from statistical theory, approach and existing application tools to develop
mathematical model and finally to transform the model in industry application and to answer a
range of inspired questions.
Prof Dato’ Dr. Kamaruzzaman Sopian graduated with the BS Mechanical Engineering from the
University of Wisconsin-Madison in 1985, the MS in Energy Resources University of Pittsburgh
in 1989 and PhD in Mechanical Engineering from the Dorgan Solar Laboratory, University of
Miami at Coral Gables in 1997. He has been involved in the field of renewable energy for more
than 25-years. He has secure research funding from the Malaysian Minstry of Science and
Malaysian Ministry of Education and industry for more than USD 6 million. He has conducted
renewable enery courses the Asian School of Energy (2007-2014) funded by ISESCO,
COMSAT, TIKA and UNESCO. He has published over 800 research papers in journals and
conferences (SCOPUS h index = 53, no. of citation = 9386) (Google Scholar h index = 64, no. of
citation = 15531). A total of 32 MSc (coursework), 15 MSc (research mode) and 50 PhD
candidates from various countries. He has undertaken short assignments in about 10 countries for
international agencies and programs such as UNDP-GEF, UNIDO, ASEAN EU-Energy Facility,
ASEAN-Australia Economic Co-operation Program, ASEAN-CIDA, JSPS-VCC, British
Council CHICHE, ISESCO and UNESCO related to renewable energy technology. He has been
appointed as the Honorary Professor of Renewable Energy, at University of Nottingham, United
Kingdom (2009-2013). In addition, he has been appointed as the associate editors in high impact
journals. He won several international awards for his academic contribution in renewable energy
including the IDB (Islamic Development Bank) S&T Prize 2013, World Renewable Energy
Network Pioneer Award 2012, Malaysia Green Technology Award 2012, and the ASEAN
Energy Awards (2005, 2007, 2013 and 2014). He has 4 patents, 20 patents pending, 6
copyrights, and 1 trademark for his innovation in renewable energy technology. The innovation
and invention in renewable energy technology have won 80 medals in national and international
innovation and invention competitions including special innovation awards such as Prix de L
'Environnement by the Swiss Society for Environmental Protection, 2001, Geneva, Sustainable
Development Award INNOVA 2007, Special Prize, Korea Invention Promotion Association at
the INPEX Pittsburgh 2008 and Energy and Environmental Award, at INNOVA 2013 in
Brussels. His Royal Highness The Sultan of Perak conferred the Paduka Mahkota Perak and the
Dato’ Paduka Mahkota Perak in 2013. He was conferred as a Fellow of the Malaysia Academy
of Sciences (FASc) in 2011.

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