Thermal Control Technology Developments for a Venus Lander

Semi-analytical thermal modeling of transverse and longitudinal fins in a cylindrical phase change energy storage system

Numerical simulation of the effect of heat conductive fillers on the heat conduction behavior of a paraffin phase change energy storage system

A series of corrosion problems caused by high-temperature, high-pressure and high-acid gas environments has been an issue in oil and gas production for a long time. During the development of a high-acid gas field, the petroleum pipe is subjected to many aspects of corrosion, and the corrosion mechanism is complicated by the condition of the coexistence of H2S/CO2. Based on the study of the corrosion problem associated with the formate packer fluid in Southwest China, three kinds of steels were studied for corrosion prevention in the alloy G3/N80 steel/TP110SS steel. The study shows that the corrosion rate of the formate packer fluid is low, but corrosion is severe in environments characterized by high temperatures, high pressures and high-acid gas contents. Based on the consideration of cost and the difficulty of realization, an anti-corrosion system was constructed based on the existing packer fluid, mainly through the introduction of a variety of anti-corrosion additives. Through the selection of various additives and corrosion experiments, a corrosion protection system of formate packer fluid was developed. Corrosion tests show that the corrosion rate of the system must be less than 0.076 mm yr−1 to achieve the purpose of corrosion protection. The formate packer fluid with corrosion protection can meet the needs of the current application.

Phase-change energy storage technology is one of the remarkable energy storage technologies in recent years. This technology can effectively solve the mismatching contradiction of energy supply and demand in time and space. It can promote the optimisation of energy utilisation and improve the efficiency of energy utilisation. There are two technical problems in using mirabilite alone as phase change materials. One is the super-cooling phenomenon, and the other is the phase separation. This research used cooling curves, differential scanning calorimetry and other experimental methods. Heat storage characteristics of mirabilite were studied through a large number of experiments. Super-cooling phenomenon and phase separation of mirabilite have been verified by adding various additives. Proportion of additives was tested repeatedly. Super-cooling degree was reduced to <2°C. Phase transition occurs at 32°C or less to ensure its application in cooling water system of air conditioning. The decay rate of enthalpy attenuation got smaller after carrying out 20 times melt–freeze cycle. Properties of Na2SO4·10H2O phase change energy storage system are very suitable for application in cooling water system of air conditioning.

Heat pipe coupled Latent Heat Thermal Energy Storage (LHTES) is a commonly used technique for improving heat storage, due to its advantages such as heat conduction, isothermal, and uniform temperature. Adding fins to the heat pipe can enhance energy storage efficiency and system performance. Although previous research has looked into how heat pipe layouts affect LHTES, there is still a dearth of research on fin geometry optimization for boosted heat transfer. In this work, we used ANSYS Fluent to simulate the consequence of fin placement upon the heating capacity of a Phase Change Material (PCM) based LHTES system. Through an in-depth analysis of the heat transfer mechanisms, in an effort to quicken the PCM’s solidification process, we adjusted the fins’ length and spacing. The LHTES system’s overall solidification time was greatly shortened by the optimized model, going from 18800 seconds to 8500 seconds, achieving a 54.79% enhancement in thermal transfer efficiency.

Study on photo pyrolysis coupling and performance of columnar phase change energy storage system based on composite phase change materials for Chinese solar greenhouse

Melting performance assessments on a triplex-tube thermal energy storage system: Optimization based on response surface method with natural convection

Thermal management is evolving as a major challenge in the design of current and future more and all electric aircraft (M/AEA). These aircraft have ever increasing numbers of onboard heat sources, higher heat loads from integration of advanced intelligence, surveillance and reconnaissance (ISR) sensors and directed energy weapons, limited and even decreasing numbers of heat sinks, the use of composite materials, etc. The associated challenges have pushed the conventional thermal management systems and their components to the limit. More efficient methods of thermal management must be implemented to ensure that the M/AEA aircraft do not overheat and prematurely abort their missions. Crucial to this effort is the need to consider advanced heat exchanger concepts, comparing their designs and performance with those of the conventional compact exchangers currently used for onboard aircraft thermal management systems. The present work identifies two promising advanced concepts, namely, microchannel heat exchangers and phase change thermal energy storage systems. Detailed conceptual design and performance models are developed for these as well as a conventional plate-fin compact heat exchanger, and their design and performance optimized for minimum dry weight. In this paper, results of these studies are presented along with comparisons with current systems, conclusions, and recommendations for future research. The results show that microchannel heat exchangers and phase change energy storage systems offer potentially significant performance benefits for aircraft thermal management.

Evaporation Features of Water Droplets with Typical Subsoil Impurities During the Motion Through High-Temperature Gas Environment: Research Experience at Tomsk Polytechnic University

Enhanced thermal performance of lithium nitrate phase change material by porous copper oxide nanowires integrated on folded meshes for high temperature heat storage

The results of a technical and economic assessment of phase change and thermochemical energy storage systems in a solar power plant utilizing a high temperature Brayton cycle thermal engine with helium as the heat transport fluid are presented. Three mathematical models were developed for this assessment. Several preliminary trade studies were carried out using three computer programs. (MHR)

The results of a technical and economic assessment of phase change and thermochemical energy storage systems in a solar power plant which utilizes a high temperature Brayton cycle thermal engine with helium as the heat transport fluid are presented. Also, a third system, a sensible heat pebble bed energy storage system, was investigated as a near term benchmark. Results are given. (WHK)

A transient analysis of phase change energy storage system for solardynamic power

Effect of thermal conductivities of shape stabilized PCM on under-floor heating system

Advances in mesoscale thermal management technologies for microelectronics