The Algorithm and Application of Variable Condition Calculation on Condenser Pressure

2012 ◽  
Author(s):  
Wei Wang ◽  
Taihua Chang ◽  
Jizhen Liu ◽  
Deliang Zeng
Keyword(s):  
Variable Condition

The methods of formaldehyde emission testing of engine: A review

2015 ◽  
Vol 29 (Supplement 1) ◽  
pp. 1530009
Author(s):  
Chunhui Zhang ◽  
Peng Geng ◽  
Erming Cao ◽  
Lijiang Wei
Keyword(s):  
Infrared Spectroscopy ◽  
Sampling Method ◽  
Formaldehyde Emission ◽  
Qualitative And Quantitative Analysis ◽  
Engine Exhaust ◽  
Detection Techniques ◽  
Qualitative And Quantitative ◽  
Emission Testing ◽  
Variable Condition ◽  
Unregulated Emissions

A number of measurements have been provided to detect formaldehyde in the atmosphere, but there are no clear unified standards in engine exhaust. Nowadays, formaldehyde, an unregulated emission from methanol engine, has been attracting increasing attention by researchers. This paper presents the detection techniques for formaldehyde emitted from the engines applied in recent market, introducing the approaches in terms of unregulated emission tests of formaldehyde, which involved gas chromatography, liquid chromatography, chromatography-mass spectrometry, chromatography-spectrum, Fourier infrared spectroscopy and spectrophotometry. The author also introduces the comparison regarding to the advantages of the existing detection techniques based on the principle, to compare with engine exhaust sampling method, the treatment in advance of detection, obtaining approaches accessing to the qualitative and quantitative analysis of chromatograms or spectra. The accuratest result obtained was chromatography though it cannot be used continuously. It also can be utilized to develop high requirements of emissions and other regulations. Fourier infrared spectroscopy has the advantage of continuous detection for a variety of unregulated emissions and can be applied to the bench in variable condition. However, its accuracy is not as good as chromatography. As the conclusion, a detection technique is chosen based on different requirements.

Prediction on Cutting Heat of the Simulation in NC Lathe

2012 ◽  
Vol 217-219 ◽  
pp. 1978-1982
Author(s):  
Jing Li ◽  
Yang Jiao ◽  
Zhan Li Wang ◽  
Fu Zhi Huang
Keyword(s):  
Cutting Temperature ◽  
Machining Process ◽  
Deformation Analysis ◽  
Operating Life ◽  
Machined Surface ◽  
Finite Element Software ◽  
Cutting Heat ◽  
Changing Trend ◽  
Variable Condition ◽  
Physical Phenomena

Cutting heat and cutting temperature are the most important physical phenomena in cutting machining process. Cutting temperature and its distribution affect the abrasion of cutting tool and the operating life directly. Meanwhile they can affect the machining precision and the machined surface quality. In this paper the ABAQUS finite element software is used to predict the thermal distribution and variable condition, moreover it is tested through the experiment. As is shown from the result, the changing trend of cutting temperature by the simulation is consistent with the real measured result, which has better precision and reliability and supplies the theoretical basis for the deformation analysis caused by cutting heat in the cutting machining process.

scholarly journals Energy-Saving Strategies and their Energy Analysis and Exergy Analysis for In Situ Thermal Remediation System of Polluted-Soil

Energies ◽  
2019 ◽  
Vol 12 (20) ◽  
pp. 4018 ◽  
Author(s):  
Tian-Tian Li ◽  
Yun-Ze Li ◽  
Zhuang-Zhuang Zhai ◽  
En-Hui Li ◽  
Tong Li
Keyword(s):  
Energy Saving ◽  
Exergy Analysis ◽  
Energy Analysis ◽  
Waste Heat ◽  
Polluted Soil ◽  
Severe Problem ◽  
Industrial Soil ◽  
Thermal Remediation ◽  
Variable Condition

The environmental safety of soil has become a severe problem in China with the boost of industrialization. Polluted-soil thermal remediation is a kind of suitable remediation technology for large-scale heavily contaminated industrial soil, with the advantages of being usable in off-grid areas and with a high fuel to energy conversion rate. Research on energy-saving strategies is beneficial for resource utilization. Focused on energy saving and efficiency promotion of polluted-soil in situ thermal remediation system, this paper presents three energy-saving strategies: Variable-condition mode (VCM), heat-returning mode (HRM) and air-preheating mode (APM). The energy analysis based on the first law of thermodynamics and exergy analysis based on the second law of thermodynamics are completed. By comparing the results, the most effective part of the energy-saving strategy for variable-condition mode is that high savings in the amount of natural gas (NG) used can be achieved, from 0.1124 to 0.0299 kg·s−1 in the first stage. Energy-saving strategies for heat-returning mode and air-preheating mode have higher utilization ratios than the basic method (BM) for the reason they make full use of waste heat. As a whole, a combination of energy-saving strategies can improve the fuel savings and energy efficiency at the same time.

scholarly journals A New Transfer Learning Fault Diagnosis Method Using TSC and JGSA Under Variable Condition

IEEE Access ◽  
2020 ◽  
Vol 8 ◽  
pp. 177287-177295
Author(s):  
Yujie Yu ◽  
Chunguang Zhang ◽  
Yingjie Li ◽  
Yuangang Li
Keyword(s):  
Fault Diagnosis ◽  
Transfer Learning ◽  
Diagnosis Method ◽  
Variable Condition

scholarly journals Coupling of microwave radiations to convective drying for improving fruit quality

2018 ◽  
Author(s):  
Neila Bahloul ◽  
M. A. Balti ◽  
M. S. Guellouze ◽  
Nabil Kechaou
Keyword(s):  
Microwave Radiation ◽  
Power Level ◽  
Bound Water ◽  
Microwave Oven ◽  
Microwave Drying ◽  
Convective Drying ◽  
Heat Temperature ◽  
Red Color ◽  
Variable Condition

The present study aims to find the best drying method to minimize the duration of the operation while respecting the nutritional value of the product. Experiments of convective drying and microwave radiation were respectively carried out with a convective dryer (heat temperature: 65 °C and air velocity: 1.3 m/s) and a microwave oven (power level: 100 W and frequency: 2450 MHz). Six coupling tests between the convective drying and microwave radiation were conducted. The only variable condition is the time output of tomatoes from the convective dryer or the microwave oven corresponding to an intermediate mass ratio (IMR) 0.5, 0.4 and 0.3. The microwave drying removes the bound water faster than convective drying. This explains the observed time savings due to convection-microwave and microwave-convection combined drying. The combination of convection drying and microwave drying to an IMR 0.5 preserved better the red color and the antioxidants of the tomato. Thus, the convection–microwave combined drying (IMR 0.5) proved most suitable for preserving the quality of tomatoes. Keywords: convective drying; microwave; coupled drying; color. 

scholarly journals Study on variable condition model for steam turbine based on internal and external characteristics

2022 ◽  
Vol 355 ◽  
pp. 03071
Author(s):  
Gang Liu ◽  
Guang Yu ◽  
Qingyuan Xue
Keyword(s):  
Steam Turbine ◽  
Engineering Application ◽  
High Accuracy ◽  
Calculation Model ◽  
Constant Flow ◽  
Constant Power ◽  
Condition Model ◽  
Design Value ◽  
Variable Condition ◽  
External Characteristics

It is not easy to carry out the detailed variable condition calculation of steam turbine in engineering application. In this paper, a variable condition calculation model based on the internal and external characteristics of steam turbine is proposed, and a variable condition calculation model of constant power and constant flow is established. The model is applied to calculate 75% THA, 50%THA, typical industrial and heating extraction conditions of a subcritical 330 MW unit. The error is small compared with the design value, and the calculation accuracy meets the requirements. The results show that the model has high accuracy and can meet the requirements of engineering application.

scholarly journals Watching the tide roll away – contested interpretations of the nature of the Lower Lakes of the Murray Darling Basin

2020 ◽  
Vol 26 (2) ◽  
pp. 130 ◽  
Author(s):  
Peter A. Gell
Keyword(s):  
Sea Water ◽  
South Australia ◽  
Ramsar Convention ◽  
Independent Evidence ◽  
Murray Darling Basin ◽  
Entire History ◽  
Variable Condition ◽  
Consumptive Water ◽  
New Evidence ◽  
Management Challenge

The Murray Darling Basin Plan (Murray Darling Basin Authority 2012) represents the largest investment by government in an Australian environmental management challenge and remains highly conflicted owing to the contested allocation of diminishing water resources. Central to the decision to reallocate consumptive water to environmental purposes in this Plan was the case made to maintain the freshwater character of two lakes at the terminus of the Murray Darling Basin, in South Australia. This freshwater state was identified as the natural condition on the basis of selected anecdotal evidence and was enshrined in the site’s listing under the Ramsar Convention. The commitment to the freshwater state was challenged under drought when sea water was seen as a means of averting acidification when low river flows risked the exposure of sulfidic sediments. Independent evidence from water quality indicators (diatoms) preserved in lake sediment records, however, attested to an estuarine, albeit variable, condition before the commissioning of near-mouth barrages in 1940. This interpretation for a naturally estuarine history, published after peer review, was overlooked in a report to the South Australian government, which argued, without the provision of new evidence from the lakes, that they were fresh for their entire history. This revised interpretation is widely cited in the scientific literature, government reports and online discussion and underpins a watering strategy aimed at a freshwater future for the Lower Lakes. The allocation of large volumes of fresh water to achieve this condition presents significant difficulties owing to the highly contested nature of water use across the Basin.

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