- 标题
- 摘要
- 关键词
- 实验方案
- 产品
-
Practical performance of a small PTC solar heating system in winter
摘要： The active solar house-heating in winter is a novel technology that is eco-friendly and economical. The performance of a small solar heating system composed of parabolic trough collector (PTC) and ventilation pipelines has been experimentally investigated in the current study. With an automatic solar-tracking device, the system adopted a PTC device of aperture area 2.407 m2. The air stream was heated in the tube collector and then driven into the test room. By examining the heat gain of the air stream passing through the PTC as well as the temperature distribution of the indoor air, the working characteristic of the solar-heating system in winter was evaluated practically. The experimental results showed that for the generally-insulated room that was located in 39.87°N latitude, the daily solar heating time reached to 6–7 h, and the thermal efficiency of the PTC device was above 60%. Supposing the heat loss is reduced effectively along the outdoor pipelines in the future, such active solar heating system will be a promising heating technology in regions that are not far north on the earth.
关键词： Thermal efficiency,Solar energy,PTC,House heating
更新于2025-09-23 15:23:52
-
[Energy, Environment, and Sustainability] Advances in Solar Energy Research || Supercritical Carbon Dioxide Solar Thermal Power Generation—Overview of the Technology and Microchannel Receiver Development
摘要： The supercritical carbon dioxide (sCO2) power cycle is being considered for solar thermal central receiver systems in the United States. The cycle lends to increased high-temperature input that is expected of the next-generation concentrating solar thermal power (CSP) systems. Power block efficiencies of about 50% can be achieved for recompression cycles at an input temperature of approximately 720 °C. Additionally, the power block is compact and less complex, raising the possibility of using thermal-storage-coupled CSP sCO2 technologies for modular (*100 MW) peak-load power plants. Three pathways toward providing solar thermal input to the sCO2 cycle have been proposed by various research groups—the molten salt receiver pathway, the solid particle receiver pathway, and the gas-phase receiver pathway. The first two technologies have the advantage of sensible thermal storage within the solid/fluid medium passing through the receiver. In the gas receiver pathway, there is a need for coupling a sensible or latent heat storage technology. Several key technologies are needed to enable the realization of the sCO2 solar thermal technology, key among them being the receiver and thermal storage. In this chapter, some of the key gas-phase receiver technologies are discussed. The group’s past and recent work on the development of microchannel solar thermal receivers for sCO2 is emphasized.
关键词： Solar thermal,Efficiency,Supercritical carbon dioxide,Microchannel,Receiver,Concentrating solar power
更新于2025-09-23 15:21:21
-
PHOTOVOLTAIC THERMAL TECHNOLOGY WITH COMPOUND PARABOLIC CONCENTRATOR
摘要： The hybrid solar system contains a photovoltaic cell (PV) module and compound parabolic concentrator (CPC). The present study aims to evaluate the potential for the introduction of the PV/T technology into Gujarat, India. The photovoltaic thermal (PV/T) system converts the solar radiation into thermal and electrical energy simultaneously. The solar radiation increases the temperature of PV modules, resulting in a drop in electrical efficiency. Through circulation of water with low temperature, heat can be extracted from the PV modules to improve the electrical efficiency. The extracted thermal energy can be used for heating purpose. The individual electrical efficiency of the PV module and thermal efficiency of CPC have been observed as 13.56% and 53.92% respectively.While the combined efficiency found as 79.18%, which is higher than the individual performance of the PV module and CPC. The combined PV/T system is a new era in solar-based power system.
关键词： Compound parabolic concentrator,electrical efficiency,Photovoltaic cell,Solar,thermal efficiency,Combined efficiency
更新于2025-09-23 15:19:57
-
Improving Thermal and Electrical Efficiency in Photovoltaic Thermal Systems for Sustainable Cooling System Integration
摘要： Research into photovoltaic thermal systems is important in solar technologies as photovoltaic thermal systems are designed to produce both electrical and thermal energy, this can lead to improved performance of the overall system. The performance of photovoltaic thermal systems is based on several factors that include photovoltaic thermal materials, design, ambient temperature, inlet and outlet fluid temperature and photovoltaic cell temperature. The aim of this study is to investigate the effect of photovoltaic thermal outlet water temperatures and solar cell temperature on both electrical and thermal efficiency for different range of inlet water temperature. To achieve this, a mathematical model of a photovoltaic thermal system was developed to calculate the anticipated system performance. The factors that affect the efficiency of photovoltaic thermal collectors were discussed and the outlet fluid temperature from the photovoltaic thermal is investigated in order to reach the highest overall efficiency for the solar cooling system. An average thermal and electrical efficiency of 65% and 13.7%, respectively, was achieved and the photovoltaic thermal mathematical model was validated with experimental data from literature.
关键词： Solar collectors,Photovoltaic,Outlet temperature,Solar cooling,Photovoltaic thermal systems,Thermal efficiency,Electrical efficiency
更新于2025-09-23 15:19:57
-
A numerical study on a photovoltaic thermal system integrated with a thermoelectric generator module
摘要： In this work, a three-dimensional numerical model is developed to investigate the performance of a photovoltaic thermal system integrated with a thermoelectric generator module (PVT/TE). Furthermore, the effects of various operating parameters such as solar radiation, coolant mass flow rate, and inlet and ambient temperatures on the performance of both the PVT and PVT/TE systems are investigated and compared. Based on the obtained results, the electrical efficiency of the PVT/TE system, when exposed to solar radiation of 600 and 1000 W/m2, is 6.23% and 10.41% higher than that of the PVT system, respectively. Besides, the electrical efficiency of the PVT and PVT/TE by increasing the inlet fluid temperature from 26 oC to 34 oC, reduces by 2.58% and 4.56%, respectively. Furthermore, by increasing the ambient temperature from 26 oC to 34 oC, the electrical efficiency of the PVT reduces by 1.43%, the electrical efficiency of the PVT/TE increases by 0.82%. Based on the simulation results, the electrical efficiency of the PVT/TE system is much higher than that of the PVT system, while the PVT system benefits from higher thermal efficiency in comparison to the PVT/TE system.
关键词： Numerical simulation,Electrical efficiency,Thermal efficiency,Thermoelectric generator module (TE),Photovoltaic thermal system (PVT)
更新于2025-09-23 15:19:57
-
Performance of Solar Photovoltaic panel using Forced convection of water-based CuO nanofluid: An Understanding
摘要： Most of the conventional Solar Photovoltaic module consists of a Silicon cell that converts sunlight into electric energy. The process of conversion into electricity is exothermic and all photons are not able to produce electricity due to insufficient energy. Depending upon efficiency to convert it into electricity only the small amount of radiations are used and rest all are involved in increasing the temperature of the module. Study shows that 80% of incident solar radiation are absorbed by a solar photovoltaic cell. This increases the temperature of the module, reduces its electrical efficiency. This increase in temperature affects the power output and lifespan of the PV module. So to maintain the temperature of the module various cooling methods such as air cooling, hydraulic cooling, heat pipe cooling, cooling with phase change materials and cooling with nanofluids have been reported in the literature. The use of suitable nanofluids is one of the effective methods to increase thermal capacitance and control the temperature rise of the PV module. To increase the performance of the system thermal properties of working fluid must be improved which is achieved by using suitable additives with the base fluid which are referred to as nanofluids. Using Copper oxide/water as a working fluid analysis was performed. It was concluded that performance can be improved significantly if we integrate the system with a good heat exchanger. In this paper, the effect of CuO based nanofluids as a cooling medium for a PV module has been reported.
关键词： Solar photovoltaic,Thermal efficiency,cut off voltage,Electrical efficiency
更新于2025-09-23 15:19:57
-
Study to improve the efficiency of c-Si material in photovoltaic power plant
摘要： In the present communication, comparison between performance of photovoltaic module with and without duct has been carried out. Different input parameters (namely, ambient air temperature, solar radiation wind speed etc.) have been considered for IIT, Delhi campus. Further, thermal modelling has been derived for the c-Si photovoltaic (PV) module alone and PV module with duct. Different parameters like outlet air temperature from duct and cell temperature have been calculated through MATLAB coding. Due to integration of duct, 3.89% and 125.74% increase in electrical output and equivalent thermal energy have been found in comparison to stand-alone PV module.
关键词： Power plant,Thermal modelling,Photovoltaic module,Equivalent thermal efficiency,Equivalent thermal energy
更新于2025-09-16 10:30:52
-
Experimental Investigation of a Novel Solar Micro-Channel Loop-Heat-Pipe Photovoltaic/Thermal (MC-LHP-PV/T) System for Heat and Power Generation
摘要： This paper aims to experimentally investigate a novel solar Micro-Channel Loop-Heat-Pipe Photovoltaic/Thermal (MC-LHP-PV/T) system which, making its first attempt to employ the co-axial tubular heat exchanger as the condenser, PV-bound multiple micro-channel tubes array as the PV/evaporator, the upper end liquid header with tiny holes as the liquid header and liquid/vapour separator, and the upper end vapour header as the vapour collector and distributor, can create the improved condensation and evaporation effects within the loop-heat-pipe (LHP) and thus, achieve significantly enhanced solar thermal and electrical efficiencies compared to traditional PV/T systems. Based on the results derived from our previous analytical study, a prototype MC-LHP-PV/T system employing R-134a as the working fluid was designed, constructed and tested, and the testing results were used to evaluate its operational performance including solar thermal and electrical efficiencies and their relevant impact factors. It is found that solar thermal efficiency of the MC-LHP-PV/T system varied with the inlet temperature and flow rate of coolant water, ambient temperature, as well as height difference between the condenser and evaporator. A lower inlet water temperature, a higher water flow rate, a higher ambient temperature, and a larger height difference between the condenser and the evaporator can help increase the solar thermal efficiency of the system. Under a range of testing conditions with the refrigerant charge ratio of 30%, a peak solar thermal efficiency (i.e., 71.67%) happened at solar radiation of 561W/m2, inlet water temperature of 18°C, water flow rate of 0.17m3/h, ambient temperature of 30°C, and height difference of 1.3m. This set of parametrical data is therefore regarded as the optimal operational condition of the MC-LHP-PV/T system. Under these specific operational condition and the real weather solar radiation, the solar thermal efficiency of the system was in the range 25.2% to 62.2%, while the solar electrical efficiency varied from 15.59% to 18.34%. Compared to the existing PV/T and BIPV/T systems, the new MC-LHP-PV/T system achieved 17.20% and 33.31% higher overall solar efficiency.
关键词： Co-axial tubular heat exchanger,Thermal efficiency,Electrical efficiency,Solar,PV/T,MCLHP
更新于2025-09-16 10:30:52
-
AIP Conference Proceedings [AIP Publishing RENEWABLE ENERGY SOURCES AND TECHNOLOGIES - Tamil Nadu, India (14–15 March 2019)] RENEWABLE ENERGY SOURCES AND TECHNOLOGIES - Performance investigation on various models on solar photovoltaic thermal (PVT) hybrid system
摘要： This research article deals with the first law of thermodynamic analysis on solar photovoltaic thermal hybrid system with three kinds of models namely model 1 (fully transverse obstacles), model 2 (partially transverse obstacles) and model 3 (longitudinal obstacles with baffles) experimentally. It was designed, fabricated and tested at the tropical climatic condition of Chennai. Two different mass flow rates of air (0.0071 kg/s and 0.0085 kg/s) have been used for enhancing the performance of the system. The performance of solar PVT hybrid system relies on solar radiation, physical geometry and mass flow rate of air. All the models were subjected to first law analyses which were compared with respect to local time and other parameters such as glazing temperature, outlet air temperature. The PVT hybrid system experimentally proved to enhance the thermal performances with an increasing air mass flow rate. The obtained experimental results are in good agreement with previous research findings.
关键词： PVT,photovoltaic thermal,model,thermal efficiency,obstacles
更新于2025-09-16 10:30:52
-
Efficiency improvement of power LED modules using a hybrid aluminum nitride substrate
摘要： This study combined experimental and theoretical analysis to investigate the hybrid aluminum nitride (AlN) substrate that can effectively improve efficiency and heat dissipation of multi-chip LED modules. The experimental results showed that hybrid AlN substrate can effectively reduce the thermal resistance from junction to substrate ΔRjs by 46% compared with metal core printed circuit board (MCPCB) as driving current increased from 0.6 A to 1.6 A. Under the rated current of 1.2 A, the Rjs and chip temperature of the AlN module was approximately 0.73 K/W and 10 °C lower than that in the MCPCB module. Compared to MCPCB, the hybrid AlN substrate also had 25% higher luminous flux at 1.2 A. Simulating results provided insight understanding of temperature distribution inside the LED modules and showed good consistency with experiments. Additionally, the decreasing rate of substrate temperature (Ts) outside the chips in AlN LED module is higher than in MCPCB LED module. This study demonstrated that the hybrid AlN substrate is a reliable and a cost effective design that can effectively improve both efficiency and heat dissipation of high power LED modules.
关键词： Thermal,Efficiency,Light emitting diode,Aluminum nitride
更新于2025-09-16 10:30:52