Impacts of Groundwater Heat Pump System on Microorganism Growth in Beijing Plain, China

Li, Binghua; Liu, Licai; Li, Qijun; Huang, Jiangen; Yang, Yu-Jun

doi:10.2991/icmeit-16.2016.51

Cited by 4 publications

(5 citation statements)

References 4 publications

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“…A good match between the supercharging system and the diesel engine, 90 the supercharging system and the EGR, 91 and even the internal components of the supercharging system 92 can make the coupling of the components of the system reach the optimal and maintain the operation of the power system efficiently and stably. A poor match within or between systems can erase the performance gains from component design or worsen the overall performance of the powertrain.…”

Section: Research Status Of Variable-altitude Turbocharging Systemsmentioning

confidence: 99%

Summary of Turbocharging as a Waste Heat Recovery System for a Variable Altitude Internal Combustion Engine

et al. 2023

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The increase in altitude causes the decrease in internal combustion engine power and the increase in pollutant emission. Converting waste heat into more useful forms of energy through the recovery of waste heat from internal combustion engines is the most promising mechanism for improving both of these goals. This paper comprehensively reviews the development and research of waste heat recovery technology of an internal combustion engine in a variable altitude environment. It is found that exhaust gas turbocharging is the most promising waste heat recovery technology to restore high-altitude internal combustion engine power. Turbochargers are affected by low temperature and low pressure at high altitudes, resulting in poor environmental adaptability, inadequate supercharging ratios, and decreased supercharging efficiency. Therefore, it is very important to select the high pressurization system facing the plateau area and its reasonable matching characteristics. The quality of exhaust energy determines how much waste heat a turbine can recover, and only the exergy part of exhaust energy can realize heat/work conversion. The main disadvantage of turbocharging technology applied in the plateau area is that the speed ratio deviates from the design value, leading to the increase of flow loss inside the supercharger. Therefore, optimizing the internal flow field of a high-altitude supercharger is a key problem to improve the efficiency of energy recovery. The conclusion drawn from this Review is that a two-stage turbocharging system will be a key technology to improve the thermal efficiency and reduce the fuel consumption of high-altitude internal combustion engines in the coming decades. In addition, the efficient utilization of the exhaust energy of the two-stage turbine and the influence of the variable compression process of the two-stage compressor on the working medium in the cylinder will be the focus of future research.

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Section: Research Status Of Variable-altitude Turbocharging Systemsmentioning

confidence: 99%

Summary of Turbocharging as a Waste Heat Recovery System for a Variable Altitude Internal Combustion Engine

et al. 2023

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“…The task of peg-in-hole assembly was realized by adjusting the position of the robot's end to improve the assembly accuracy. Li [167] researched the assembly of small and precise parts. In the contact stage, the BP neural network and the genetic algorithm were used to establish a micro-force feedback model to realize the shaft-hole assembly with 2 µm and 5 µm assembly gaps, as shown in Figure 19a.…”

Section: Intelligent Controlmentioning

confidence: 99%

A Review of Intelligent Assembly Technology of Small Electronic Equipment

Tian

Ding

Du³

et al. 2023

Micromachines

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Electronic equipment, including phased array radars, satellites, high-performance computers, etc., has been widely used in military and civilian fields. Its importance and significance are self-evident. Electronic equipment has many small components, various functions, and complex structures, making assembly an essential step in the manufacturing process of electronic equipment. In recent years, the traditional assembly methods have had difficulty meeting the increasingly complex assembly needs of military and civilian electronic equipment. With the rapid development of Industry 4.0, emerging intelligent assembly technology is replacing the original “semi-automatic” assembly technology. Aiming at the assembly requirements of small electronic equipment, we first evaluate the existing problems and technical difficulties. Then, we analyze the intelligent assembly technology of electronic equipment from three aspects: visual positioning, path and trajectory planning, and force–position coordination control technology. Further, we describe and summarize the research status and the application of the technology and discuss possible future research directions in the intelligent assembly technology of small electronic equipment.

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“…It is widely assumed that a high quenching temperature would result in low toughness due to the coarse grain size. Given that the quenching of high-speed steel microstructure contains a high percentage of martensite and residual austenite, tempering should be conducted as soon as possible to ensure microstructure transformation, residual stress reduction, and secondary hardening (Li, 2017). The current heat treatment process was devised with reference to extensive literature and previous experimental results (Peng et al, 2018a;Peng et al, 2018b;Firouzi et al, 2022;Hu et al, 2022).…”

Section: Figurementioning

confidence: 99%

Effects of sintering temperatures on the microstructure and mechanical properties of S390 powder metallurgy high-speed steel

Wang

Chen

et al. 2023

Front. Mater.

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High-performance complex gear cutters and high-temperature bearings are just some of the applications where high-speed steels (HSSs) shine as a preferred material choice owing to their high hardness and outstanding wear resistance. In this work, the effects of sintering temperature on the microstructure and mechanical properties of S390 HSS prepared via spark plasma sintering (SPS) were investigated with a range of sintering temperatures from 930°C to 1,090°C, a uniaxial pressure of 50 MPa, and a holding time of 5 min. The results demonstrated that the improvements in density, hardness, red hardness, and three-point bending strength were confirmed as the sintering temperature increased from 930°C to 1,090°C. Temperature-induced microstructure evolutions were assessed for their contribution to property enhancement, such as powders with varying dimensions and carbides with diverse morphology and diameter. The specimen with the best comprehensive mechanical properties (67.1 HRC and 1,196.67 MPa) was prepared at 1,050°C via SPS. The wear coefficients decreased as the sintering temperature increased, and the observation results of worn surfaces of test pins confirmed that abrasive wear and oxidation wear dominated the wear experiments. Furthermore, the wear mechanism of dense and porous SPS HSS was illustrated and analyzed in terms of the debris and trapped carbides.

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Impacts of Groundwater Heat Pump System on Microorganism Growth in Beijing Plain, China

Cited by 4 publications

References 4 publications

Summary of Turbocharging as a Waste Heat Recovery System for a Variable Altitude Internal Combustion Engine

Summary of Turbocharging as a Waste Heat Recovery System for a Variable Altitude Internal Combustion Engine

A Review of Intelligent Assembly Technology of Small Electronic Equipment

Effects of sintering temperatures on the microstructure and mechanical properties of S390 powder metallurgy high-speed steel

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