A photovoltaic/thermal system with a combination of a booster diffuse reflector and vacuum tube for generation of electricity and hot water production

Mohsenzadeh, Milad; Hosseini, Reza

doi:10.1016/j.renene.2015.01.010

Cited by 41 publications

(10 citation statements)

References 17 publications

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“…A photovoltaic/ thermal system in combination with a booster diffuse reflector and vacuum tube for electricity generation and hot water production was analyzed in Ref. [32] as well as parametric analysis. A numerical investigtion of the PV/T (photovoltaic thermal) collector was given in Ref.…”

Section: State-of-the-artmentioning

confidence: 99%

“…Rejected heat is energy potential that can be used for hot water preparation and in that sense there are lot of investigations where different hybrid PV/T concepts are proposed and analyzed in detail [12,32,33,43,48], to utilize that possibility. These hybrid PV/T systems are able to simultaneously produce electricity and hot water, and for these kinds of systems the overall energy efficiency reaches an average of 60% up to 80%, in accordance to the specific PV/T concept chosen.…”

Section: Energy Analysis Thermodynamic Approachmentioning

confidence: 99%

See 1 more Smart Citation

Energy efficiency evaluation of a hybrid energy system for building applications in a Mediterranean climate and its feasibility aspect

Nižetić

Duić

Papadopulos

et al. 2015

Energy

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Section: State-of-the-artmentioning

confidence: 99%

Section: Energy Analysis Thermodynamic Approachmentioning

confidence: 99%

Energy efficiency evaluation of a hybrid energy system for building applications in a Mediterranean climate and its feasibility aspect

Nižetić

Duić

Papadopulos

et al. 2015

Energy

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“…The effect of different flow rates on electrical efficiency of the PVT collector is shown in figure 7. Increasing the flow rate provides lower operating conditions for the PV cells and therefore, improves their electrical efficiency [39]. The results deduced that electrical efficiency increased by 0.45 % when the flow rate raised from 30 to 90 L/h and the highest electrical efficiency was found to be 13.6 %.…”

Section: Experimental Data and Model Verificationmentioning

confidence: 94%

Temperature distribution and efficiency assessment of different PVT water collector designs

2018

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The aim of this work was to study different hybrid photovoltaic-thermal (PVT) collectors. Numerical simulation of the collectors was carried out using a 3-dimensional computational fluid dynamic (CFD) model. A set of experiments was conducted using a box-type PVT collector to validate the obtained computed data. Simulation results for water outlet temperature, especially at the lower flow rates, were closer to the measured data compared with average module surface temperature. Based on the simulation results, the spiral flow designs of heat exchanger provided the most uniform temperature distribution for module surface and the highest temperature gradient was observed with the direct flow designs. A hot zone was generated on the module surface of the direct flow box-type collector and the results indicated that the hot zone was considerably declined using cross-fins inside the box-type heat exchanger. The highest heat transfer to the ambient occurred with the spiral flow design and the box type heat exchanger presented a relatively low heat losses. The cross-fined box type and the spiral flow designs of the PVT collector had the highest electrical efficiencies at the different test conditions.

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“…Comparing the results, we found that the electrical efficiency of PV/T systems increases with the use of water mist cooling, 101 the use of finned copper tubes for water to flow through, 100 the use of the reflector, absorbent humidity. 20 Also, studies have shown that the thermal efficiency of the PV/T system with the inverter has reached 62.9%, 121 and for the case of spiral flow it has reached 54.6% 113 while in the case of double fluid flow 117 it has reached 66.12%. Mohsenzadeh and Hosseini 121 advised not to use the reflectors directed to the solar panels without using an appropriate cooling system as it may cause the unit to overheat significantly.…”

Section: One Fluid Flow In a Pv/tmentioning

confidence: 99%

A review of photovoltaic thermal systems: Achievements and applications

et al. 2020

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Summary The use of photovoltaics has spread widely, and government agencies have begun adopting plans to deploy plants with large capacities, due to their environmental friendliness, low manufacturing costs, and high productivity. In the sunny countries where this technology should spread, the photovoltaics' energy conversion efficiency decreases due to the high temperature of which the cell's operate at; because a large part of the solar radiation is absorbed by the solar panels as heat, while the smaller part converts it to electricity. From here, the benefit of the shift towards the PV/T technology that works to reduce the photovoltaic modules temperature and improve their electricity produced along with yielded thermal energy which can be utilized in other applications. In this study, a thorough review of many recent research and studies published in the field of PV/T has been carried out. The present study was divided into several sections to clarify and focus on the effect of each technology separately. Researchers used one or more fluids to cool the solar panels, and their research dealt with many of these fluids, starting with air, water, oil, etc. Other researchers have tended to increase the thermal conductivity of liquid cooling fluids by adding many types of nanoparticles with high thermal conductivity. Other researchers have used variable‐phase materials to take advantage of the large storage of the latent heat of these materials. Other researchers have studied improving heat transfer of PCMs by mixing it with nanomaterials with high thermal conductivity. Others have also combined nano‐PCMs and nanofluids together in one system, and they have demonstrated, in theory and practice, that this technique exhibits higher energy collection and utilization than the other types of PV/T. At the conclusion of the study, some critical points are identified that work is still limited and needs more research efforts and studies.

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A photovoltaic/thermal system with a combination of a booster diffuse reflector and vacuum tube for generation of electricity and hot water production

Cited by 41 publications

References 17 publications

Energy efficiency evaluation of a hybrid energy system for building applications in a Mediterranean climate and its feasibility aspect

Energy efficiency evaluation of a hybrid energy system for building applications in a Mediterranean climate and its feasibility aspect

Temperature distribution and efficiency assessment of different PVT water collector designs

A review of photovoltaic thermal systems: Achievements and applications

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