Improving Thermal and Electrical Efficiency in Photovoltaic Thermal Systems for Sustainable Cooling System Integration

Alobaid, Mohammad; Hughes, Ben Richard; O’Connor, Dominic; Calautit, John Kaiser; Heyes, Andrew

doi:10.13044/j.sdewes.d5.0187

Cited by 37 publications

(22 citation statements)

References 22 publications

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“…Since the purpose was not only to obtain effective cooling but also a good overall efficiency, more electrical power was not produced from the PV/T system than the PV module, as it was in the study of Kazem [15]. However, the overall efficiency was well high and close to the values in the study of Alobaid et al [14]. Ben Cheikh el hocine et al [10] used a natural air circulation in the PV/T system as the exchanger of air temperature and achieved 16.24% thermal efficiency.…”

Section: Introductionsupporting

confidence: 58%

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An Investigation on the Effect of the Total Efficiency of Water and Air Used Together as a Working Fluid in the Photovoltaic Thermal Systems

Atmaca

Pektemir

2019

Processes

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The temperature of a PV (photovoltaic) panel increases when it produces electricity but its electrical efficiency decreases when the temperature increases. In addition, the electrical efficiency of the PV panel is very limited. To increase the PV efficiency, the rest of the solar irradiance must be used, together with the temperature being kept at an optimum value. With this purpose, an experimental study was conducted. Firstly, two specific photovoltaic-thermal (PV/T) systems were designed. The first was the PV/T system which used only a water heat exchanger. The other one was the PV/T system that used a water and air heat exchanger. In the latter PV/T system, air passed through both the top of the PV panel and the bottom of it while water passed through only the bottom of the panel in a separate heat exchanger. In this way, the water and air absorbed the thermal energy of the panel by means of separate heat exchangers, simultaneously. In addition to the two systems mentioned above, an uncooled photovoltaic module was also designed in order to compare the systems. As a result, three different modules were designed. This study was conducted in a natural ambient environment and on days which had different climatic conditions. The thermal, electrical and overall efficiencies of each PV/T module were determined. The results were compared with the uncooled module electrical efficiency. The results showed that when water and air were used together, it was more efficient than single usage in a PV/T system. The thermal gain of the working fluids was also found to be fairly high and so, the gained energy could be used for different purposes. For example, hot air could be used in drying systems and air condition systems. Hot water could be used in hot water supply systems.

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Section: Introductionsupporting

confidence: 58%

“…Alobaid et al [14], investigated the overall performance of the water based PV/T system using a mathematical model. According to their results, the electrical efficiency changed between 14.7% and 15.5% depending on the PV cell temperature.…”

Section: Introductionmentioning

confidence: 99%

An Investigation on the Effect of the Total Efficiency of Water and Air Used Together as a Working Fluid in the Photovoltaic Thermal Systems

Atmaca

Pektemir

2019

Processes

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“…The total number of units in the complex is 80 units. For estimation of maximum power, taking into account the coincidence coefficient and consumption of each unit, we can use Equation (2). Anyway, we know as we calculated for a unit and whether no one was in the home or all of three inhabitances were at home Therefore, this mode is also possible for 240 inhabitants of the home (Figure 8).…”

Section: Absorption Chillermentioning

confidence: 99%

“…According the energy crisis in recent decade and the increasing use of fossil fuels as a source of energy and its impact on the environment, the world is pushed to deal with energy issues, so the use of renewable energies is essential . Renewable energy is free, clean, and free from environmental degradation that has long been used in many ways.…”

Section: Introductionmentioning

confidence: 99%

Thermal analysis of parabolic trough concentration photovoltaic/thermal system for using in buildings

Alayi

Kasaeian

Atabi

2019

Env Prog and Sustain Energy

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In this research, a parabolic trough concentrating photovoltaic thermal (CPVT) was used to provide the energy needed for a residential building. In order to do this, the required amount of heating and cooling and electrical energy was first obtained using Carrier software, then the electrical demand was obtained according to the standard model and governing relations. In the next step, the CPVT as a source of heat and cooling, and electrical energy for the building, was simulated in TRNSYS software. In order to achieve the highest reliability in terms of heat supply and reduction of thermal losses in the whole system, phase‐change material was used as a heat storage source. Mehrabad (Tehran) was considered as the target area in simulation. For this area the highest radiation intensity is 7.79 kWh/m2·day, which shows the potential of the region. The simulation results of the studied system showed that the highest output temperature and solar fraction for total load in building from CPVT was 150°C and 0.0.2926. © 2019 American Institute of Chemical Engineers Environ Prog, 38: e13220, 2019

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“…This constraint leads to minimize the options to: T in = 323 K, 0.0013 kg/s and η th = 86% or T in = 333 K, 0.0022 kg/ and η th = 84%. Therefore, in order to improve SCOP in the solar absorption system, the inlet water temperature and flowrate need to be optimised [40]. A range of inlet water temperature was examined at high ambient temperature (318 K) in order to achieve the driven temperature for the chiller with high FPC thermal efficiency.…”

Section: Employing Fpc Outlet Water Temperature For Solar Absorption mentioning

confidence: 99%

Determining the Effect of Inlet Flow Conditions on the Thermal Efficiency of a Flat Plate Solar Collector

Alobaid

Hughes

Heyes

et al. 2018

Fluids

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The main objective of this study was to investigate the effect of inlet temperature (Tin) and flowrate ( m ˙ ) on thermal efficiency ( η t h ) of flat plate collectors (FPC). Computational Fluid Dynamics (CFD) was employed to simulate a FPC and the results were validated with experimental data from literature. The FPC was examined for high and low level flowrates and for inlet temperatures which varied from 298 to 373 K. Thermal efficiency of 93% and 65% was achieved at 298 K and 370 K inlet temperature’s respectively. A maximum temperature increase of 62 K in the inlet temperature was achieved at a flowrate of 5 × 10−4 kg/s inside the riser pipe. Tin and m ˙ were optimised in order to achieve the minimum required feed temperature for a 10 kW absorption chiller.

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Improving Thermal and Electrical Efficiency in Photovoltaic Thermal Systems for Sustainable Cooling System Integration

Cited by 37 publications

References 22 publications

An Investigation on the Effect of the Total Efficiency of Water and Air Used Together as a Working Fluid in the Photovoltaic Thermal Systems

An Investigation on the Effect of the Total Efficiency of Water and Air Used Together as a Working Fluid in the Photovoltaic Thermal Systems

Thermal analysis of parabolic trough concentration photovoltaic/thermal system for using in buildings

Determining the Effect of Inlet Flow Conditions on the Thermal Efficiency of a Flat Plate Solar Collector

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