Institutional Repository of GuangZhou Institute of Energy Conversion, CAS
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Performance analysis on a hybrid system of wind, photovoltaic, thermal, storage, CO<sub>2</sub> sequestration and space heating
No full textThe combined heat and power generation (CHP) is an efficient and economical solution to the intermittency and instability faced by renewable energy power and however, the heat-power coupling lowers its regulation depth. Thermal energy storage is a valid measure to solve the above problem, however, the major bottleneck is lack of thermal energy storage ways with large capacity, high efficiency, low cost and longtime simultaneously. Here, a novel hybrid system of wind-photovoltaic-thermal-storage-CO2 sequestration-space heating is proposed, which can store thermal energy and sequestrate CO2 in saline aquifer simultaneously. The results show heat extraction power, energy storage capacity, energy storage density and thermal recovery efficiency for the hybrid system are respectively 6391.14 kW, 66263.36 GJ, 23276.37 kJ/m3 and 81.17 %. The hybrid system extends the adjustable range of CHP from 200 MW to 700 MW through thermal energy storage and heat-power decoupling, thus accommodating more renewable energy power. The amount of sequestrated CO2 captured from exhaust gas of thermal power station is 2,306,880 tons, equivalent to 854,400 tons of standard coal in terms of carbon dioxide emissions. In addition, the repeated injection and extraction of working gas in the hybrid system accelerates CO2 solubility in saline aquifer
Long-term thermal behaviour of silver and graphene nanoparticle-enhanced phase change materials under accelerated thermal stress
No full textLong-term performance of a nano enhanced phase change material (NePCM) plays a crucial role in its application for thermal-related application. PCMs often encounter challenges related to their stability and reliability in maintaining effective thermal regulation. Over time, they tend to degrade and lose their storage capability due to prolonged exposure to the ambient environment and repeated melting/freezing cycles. Therefore, it is essential to assess the cycle test stability of PCMs to ensure their long-term durability before integrating them into thermal systems. However, relevant long-term stability assessment of the NePCMs has been rarely reported. This study, therefore, investigate the stability and durability of the RT50 (a commercial PCM) based NePCM, with silver (Ag) and graphene (Gr) NPs as nano-additives. Accelerated thermal cycling method with up to 3000 cycles was adopted to evaluate the durability PCM (RT50) and its NePCM (0.8%Ag/RT50 & 0.6%Gr/RT50). Moreover, their key properties including the microstructure, chemical stability, optical absorbance, thermal reliability and energy storage ability are examined at regular interval. The results show that NePCMs possess excellent thermal chemical stability even after 3000 thermal cycles, and latent heat (slight reduction approximately 10 %). It is worth noting that owing to the stronger intermolecular force between RT50 and Gr, the energy storage capacity of Gr/RT50 NePCM is observed to display an increasing trend with thermal cycling. Overall, the prepared NePCM has validated the long-term reliability, and pave ways for its thermal regulation application
Parametric Analysis of a Novel Array-Type Hydrogen Storage Reactor with External Water-Cooled Jacket Heat Exchange
No full textHydrogen energy is a green and environmentally friendly energy source, as well as an excellent energy carrier. Hydrogen storage technology is a key factor in its commercial development. Solid hydrogen storage methods represented by using metal hydride (MH) materials have good application prospects, but there are still problems of higher heat transfer resistance and slower hydrogen absorption and release rate as the material is applied to reactors. This study innovatively proposed an array-type MH hydrogen storage reactor based on external water-cooled jacket heat exchange, aiming to improve the heat transfer efficiency and absorption reaction performance, and optimize the absorption kinetics encountered in practical applications of LaNi5 hydrogen storage material in reactors. A mathematical model was built to compare the hydrogen absorption processes of the novel array-type and traditional reactors. The results showed that, with the same water-cooled jacket, the hydrogen absorption rate of the array-type reactor can be accelerated by 2.78 times compared to the traditional reactor. Because of the existence of heat transfer enhancement limits, the increase in the number of array elements and the flow rate of heat transfer fluid (HTF) has a limited impact on the absorption rate improvement of the array-type reactor. To break the limits, the hydrogen absorption pressure, as a direct driving force, can be increased. In addition, the increased pressure also increases the heat transfer temperature difference, thereby further improving heat transfer and absorption rate. For instance, at 3 MPa, the hydrogen absorption time can be shortened to 147 s
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