RESUMEN
This research portrayed the analysis of performance enhancement through a relative optimization approach of novel solar still models based on energetic-exergetic performances and energy matrices with environs-economic breakthroughs and is an extension of the existing research done by Singh & Samsher, and Singh & Gautam in the year 2022. The existing solar distiller models haven't shown relative influence on the performance of variable number of vacuum tubes, fully/partially illuminated and with/without the augmentation of parabolic concentrators among different schemes of solar still models. The present research bridges the above gaps to identify the analytical observations for the optimized results for the novel arrangement of the solar distillers compared to others. The dual slope solar still (DSS) with parabolic solar receiver (PSR) and evacuated annual tubes (EATC) found superior among other schemes and the DSS-EATC-PSR arrangement is advanced and enhanced with basin mass temperature (11.4 %) in observance with 30° inclined glaze cover and vacuum tubes altogether. A natural circulated thermo siphon shows increment (28.1 % & 0.1 %) to DSS-EATC-PSR relative to SSS with EATC & PSR, respectively. Further, the daily overall efficiencies (energy and exergy) have a marginal decrement of 8.4 % and 4.7 %, respectively, than the single-face solar still scheme (SSS). The daily yielding improvement is 4.6 % than the SSS scheme with nominal promotional cost (0.07 $/l) at a noticeable production cost. The CO2 mitigates, and environmental revenue is better than the SSS scheme by 5.9 % & 14.6 %. The concern price of the DSS coordination is lower by 6.6 %, and the productivity of the systems was found to be more than 100 % which assures the viability of the projected scheme.
RESUMEN
The solar receiver is a vital component of concentrated solar collectors that absorbs solar radiation and converts it into heat. One of the challenges the research community faces is minimizing heat loss from the receiver at higher temperatures to maximize the thermal performance of parabolic dish collectors and achieve the system's cost-effectiveness. Cavity receivers have a complex design that makes them more challenging to manufacture and entails higher costs for improved thermal performance. Implementing innovative receiver designs is essential to maximize the absorption of solar radiation and minimize heat losses. In this experimental study, a cost-effective solar receiver was fabricated with fins to study heat transfer. The solar receiver is examined using water as heat transfer fluid with three flow rates of 0.097 kg/s, 0.125 kg/s, and 0.152 kg/s. The residence time of water is increased by adopting integrated fin receiver designs. The provision of fins in the solar receiver enhances heat transfer by increasing the turbulence in the fluid flow and results in higher thermal efficiency. The average energy and exergy efficiencies are 67.81 % and 8.93 %, respectively, with a 0.152 kg/s flow rate. At the highest water flow rate (0.152 kg/s) considered in this study, a lesser heat loss of about 3776.2 W occurred due to the effective heat transfer. The cost metrics, like levelized cost of electricity, net present value, and the payback period, are about 0.21 $/kWh, 923 $, and 3.38 years, respectively, at 0.152 kg/s flow rate. The proposed solar receiver produces optimal thermo-economic performance and lower initial investment for steam generation than other receiver designs. The current experimental study's findings could benefit the entire solar industry by presenting an effective solar receiver design for solar collectors.
RESUMEN
Enhancing the operating temperature of concentrating solar power systems is a promising way to obtain higher system efficiency and thus enhance their competitiveness. One major barrier is the unavailability of suitable solar absorber materials for operation at higher temperatures. In this work, we report on a new high-temperature absorber material by combining Ti2AlC MAX phase material and iron-cobalt-chromite spinel coating/paint. This durable material solution exhibits excellent performance, passing the thermal stability test in an open-air environment at a temperature of 1250 °C for 400 h and at 1300 °C for 200 h. The results show that the black spinel coating can offer a stable high solar absorptivity in the range of 0.877-0.894 throughout the 600 h test under high temperatures. These solar absorptivity values are even 1.6-3.3% higher than that for the sintered SiC ceramic that is a widely used solar absorber material. Divergence of solar absorptivity during these relatively long testing periods is less than 1.1%, indicating remarkable stability of the absorber material. Furthermore, considering the simple application process of the coating/painting utilizing a brush followed by curing at relatively low temperatures (room temperature, 95 and 260 °C in sequence), this absorber material shows the potential for large-scale, high-temperature solar thermal applications.
RESUMEN
This work presents the modeling and optimization of an indirectly irradiated solar receiver. A numerical model of the cavity-absorber block is put forward with the coupling of the net-radiation method using infinitesimal areas and a CFD code. An iterative method with a relaxation factor made it possible to obtain the temperature distribution and the developed code was implemented in the form of UDF and used as boundary conditions in the CFD model of the absorber to simulate the flow of air and heat transfer. The good ability of the receiver to transfer heat to the fluid is proved with a 92% thermal efficiency obtained. Then the combination of the Kriging surface response method and the MOGA allowed the mathematical optimization of the receiver. The multi-objective optimization made it possible to obtain 3 candidates giving the best combinations of design parameters from the fixed objectives. Three bullet points, highlighting the customization of the procedure. â¢A practical analysis using the net-radiation method using infinitesimal areas is applied for cavity radiative exchange model.â¢The code developed for the cavity is implemented in the boundary conditions at the level of the ANSYS Fluent CFD model allowing the simulation of the conjugated transfers within the absorber.â¢The optimization method proposed is the combination of the Kriging surface response method for quantitative and qualitative analysis of the design parameters and MOGA to obtain different combinations seeking to maximize or to minimize the chosen parameters.