A novel solar system integrating concentrating photovoltaic thermal collectors and variable effect absorption chiller for flexible co-generation of electricity and cooling
“…The reported COP varied from 0.143 to 0.232 under the Mediterranean weather conditions. Another novel study by Lin et al [ 156 ] shows the examination of a system with variable absorption stages connected to a CPVT. The mathematical model, solved by EES, showed the effect of different parameters on this unit.…”
Section: Concentrating Photovoltaic Thermal Collectors In Refrigeration Cyclesmentioning
confidence: 99%
“… Fig. 22 Schematic of a novel solar co-generation system using variable effect chiller [ 156 ]. [Reprinted with permission from Elsevier] …”
Section: Concentrating Photovoltaic Thermal Collectors In Refrigeration Cyclesmentioning
confidence: 99%
“…Also, an absorption chiller was used in the setup [ 150 ] Heng et al Experimental LCPVT assisted with an absorption chiller By concentration ratio of 4 running absorption chiller with COP varied from 0.48 up to 0.55 [ 145 ] Al-Nimr and Mugdadi Simulation Absorption/thermo- electric cooling cycle Using hybrid setup and provided electricity for thermo-electric configuration and thermal energy to supply energy demand of absorption process [ 155 ] Lin et al Numerical Variable absorption chiller with CPVT The numerical model was developed by EES software. So, three working modes of an absorption chiller and a wider temperature range were covered during the process [ 156 ] Al Keyyam et al Simulation Solar atmospheric water harvesting integrated system The new system used CPV/T, Stirling engine, absorption, and compression refrigeration cycles. The absorption refrigeration COP was 0.75.…”
Section: Concentrating Photovoltaic Thermal Collectors In Refrigeration Cyclesmentioning
Refrigeration systems have a broad range of applications, playing a critical role in human life. Especially, vaccine preservation in rural regions has become more critical than in the past during the COVID19 era. In this sense, meeting the cooling process's energy need with renewable energy is critical, as the grid cannot support it. Thus, solar energy has been extensively studied for use in refrigeration cycles. Compression, absorption, adsorption, desiccant, and ejector refrigeration cycles are frequently used in this configuration. This article discusses multiple studies showing various attributes' impact on a system's overall efficiency. Most previous reviews did not cover PV with refrigeration cycles. So, this paper surveys the literature on PV-powered cooling cycles. For better classification, PV technologies are categorized into three types: PV, PVT, and CPVT. With this regard, CPVTs still have a way to progress due to a lack of studies compared to PV. The works are divided into three main sections as Exergy Studies, Experimental Studies, and Simulation and Numerical Studies. This review paper categorizes and rates refrigeration-assisted solar systems based on exergy destruction, exergy efficiency, and COP of cooling cycles. The results showed that PV panels have the highest exergy destruction in most of the systems. It is concluded that using PV technologies has a great potential to supply cooling demand, especially in a hot climate condition. Moreover, the study's findings are anticipated to aid designers in scaling up photovoltaic-based cooling systems, resulting in more efficient and sustainable designs.
“…The reported COP varied from 0.143 to 0.232 under the Mediterranean weather conditions. Another novel study by Lin et al [ 156 ] shows the examination of a system with variable absorption stages connected to a CPVT. The mathematical model, solved by EES, showed the effect of different parameters on this unit.…”
Section: Concentrating Photovoltaic Thermal Collectors In Refrigeration Cyclesmentioning
confidence: 99%
“… Fig. 22 Schematic of a novel solar co-generation system using variable effect chiller [ 156 ]. [Reprinted with permission from Elsevier] …”
Section: Concentrating Photovoltaic Thermal Collectors In Refrigeration Cyclesmentioning
confidence: 99%
“…Also, an absorption chiller was used in the setup [ 150 ] Heng et al Experimental LCPVT assisted with an absorption chiller By concentration ratio of 4 running absorption chiller with COP varied from 0.48 up to 0.55 [ 145 ] Al-Nimr and Mugdadi Simulation Absorption/thermo- electric cooling cycle Using hybrid setup and provided electricity for thermo-electric configuration and thermal energy to supply energy demand of absorption process [ 155 ] Lin et al Numerical Variable absorption chiller with CPVT The numerical model was developed by EES software. So, three working modes of an absorption chiller and a wider temperature range were covered during the process [ 156 ] Al Keyyam et al Simulation Solar atmospheric water harvesting integrated system The new system used CPV/T, Stirling engine, absorption, and compression refrigeration cycles. The absorption refrigeration COP was 0.75.…”
Section: Concentrating Photovoltaic Thermal Collectors In Refrigeration Cyclesmentioning
Refrigeration systems have a broad range of applications, playing a critical role in human life. Especially, vaccine preservation in rural regions has become more critical than in the past during the COVID19 era. In this sense, meeting the cooling process's energy need with renewable energy is critical, as the grid cannot support it. Thus, solar energy has been extensively studied for use in refrigeration cycles. Compression, absorption, adsorption, desiccant, and ejector refrigeration cycles are frequently used in this configuration. This article discusses multiple studies showing various attributes' impact on a system's overall efficiency. Most previous reviews did not cover PV with refrigeration cycles. So, this paper surveys the literature on PV-powered cooling cycles. For better classification, PV technologies are categorized into three types: PV, PVT, and CPVT. With this regard, CPVTs still have a way to progress due to a lack of studies compared to PV. The works are divided into three main sections as Exergy Studies, Experimental Studies, and Simulation and Numerical Studies. This review paper categorizes and rates refrigeration-assisted solar systems based on exergy destruction, exergy efficiency, and COP of cooling cycles. The results showed that PV panels have the highest exergy destruction in most of the systems. It is concluded that using PV technologies has a great potential to supply cooling demand, especially in a hot climate condition. Moreover, the study's findings are anticipated to aid designers in scaling up photovoltaic-based cooling systems, resulting in more efficient and sustainable designs.
“…As a result, the system's exit fluid temperature is often below 100 • C, producing low-grade thermal energy that some technologies can use. Different solar cogeneration systems, including the organic Rankine cycle [18], absorption and adsorption systems [19,20], solar desiccant cooling, and combined heat and power systems [21], have been the focus of many studies.…”
The technology of a hybrid solar concentration photovoltaic/thermal (CPV/T) system is an efficient way of converting solar energy to heat and electrical power, in which overall energy-extraction efficiency is at its highest. In this study, numerical dynamic simulation models were developed for a hybrid solar CPV/T system and an adsorption refrigeration system (ARS). Under the climatic conditions of Riyadh all year round, the electrical and thermal powers generated by the CPV/T system were used to estimate the ice production of both the vapor compression refrigeration system (VCS) and the ARS. The CPV/T system can provide a thermal energy of 37.6 kWh and electrical energy of 24.7 kWh a day on average over the year using a 12.5 m2 facing area of Fresnel lenses. The ARS employed an advanced approach which used Maxsorb III adsorbent packed in two aluminum foam beds. An optimum cycle time of the ARS was adapted for each month to match the variation in the thermal energy, while a variable-speed compressor was chosen for the VCS. Due to its higher coefficient of performance (COP), the proposed solar hybrid system can produce 494.4 kg of ice per day while sharing 84.5% of the VCS. The average solar COP over the year of the hybrid system can attain 0.875, which represents a promising value for a solar ice-production system.
“…The CPVT systems are used for both residential and large-scale applications. A few examples of applications for CPVT systems include water heating [11], water desalination [12], cogeneration of water and electrical power [13], greenhouse heating [14], cogeneration of electricity and cooling [15], [16], desiccant wheel cycle [17], building integration [18], textile industry application [19], and heat recovery with organic Rankine cycle [20]. More details of the recent advancements in commercial applications can be found in this reference [21].…”
Concentrated Photovoltaic Thermal (CPVT) systems play an important role in solar system development, reducing dependency on fossil fuels and meeting global energy demand. This research investigates the CPVT model, which uses pointfocus Fresnel lenses (PFFL) to amplify a significant amount of irradiance and focus it on photovoltaic surfaces to simultaneously produce electrical and thermal energy. The proposed model has Multi-Junction Photovoltaic (MJPV) solar cells, PFFL, copper heat sinks, and a copper cooling pipe. A numerical model was developed to investigate and evaluate the thermal and electrical performance of the proposed model under various input and output parameters. The numerical model has been first validated and then used to simulate the impact of the concentration ratio (CR), Heat transfer fluid (HTF) flow rates, HTF inlet temperature, incident radiation, and the optical efficiency of the Fresnel lens on the HTF outlet temperature, MJPV cell temperature, and thermal and electrical efficiency. The CFD model's minimum and maximum thermal output efficiencies were around 59.5% and 85.3%, respectively. The highest electrical efficiency occurred at a mass flow rate of 0.025 kg/s, CR = 100x, and its value was 35.74%. Further, the results show that the maximum thermal and electrical energies were 618.5 W and 219.35 W, respectively. The numerical model was validated with experimental data and demonstrated that the maximum error between the experimental and CFD models was less than 5%, confirming that the results are satisfactory and agree well with the experimental results. Finally, the results show that CPVT is a promising renewable energy system with excellent opportunities to compete with conventional power generation systems.
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