An Analysis on the Water Consumption Rate of LongTan Hydropower Station with Properties of Water Energy

2013 ◽  
Vol 648 ◽  
pp. 218-222
Author(s):  
Xiao Guang Lei ◽  
Ao Yin
Keyword(s):  
Mathematical Model ◽  
Water Consumption ◽  
Consumption Rate ◽  
Hydropower Station ◽  
Total Water ◽  
Unit Load ◽  
Total Water Consumption ◽  
Actual Operation ◽  
Incremental Rate ◽  
The Mathematical Model

The mathematical model of water consumption rate of LongTan Hydropower Station is established in this thesis. With the aim of reaching the minimum total water consumption of power generation, Equation Incremental Rate is used to solve this mathematical model with constant overall load of the hydropower station. Equation Incremental Rate is used in this thesis to solve some instances, prove the rationality of the mathematical model established and demonstrate that the unit load value calculated can direct the actual operation of the hydropower station better, thus the aim of energy saving and consumption reducing can be achieved.

scholarly journals An improved prediction method of water consumption rate considering aftereffects for short-term dispatching of hydropower station

2020 ◽  
Vol 199 ◽  
pp. 00008
Author(s):  
Xiao Chen ◽  
Jianzhong Zhou ◽  
Benjun Jia ◽  
Yuqi Yang ◽  
Li Li
Keyword(s):  
Water Consumption ◽  
Consumption Rate ◽  
Prediction Method ◽  
Hydropower Station ◽  
Short Term ◽  
Absolute Deviation ◽  
Generation Scheduling ◽  
Operation Process ◽  
Actual Operation ◽  
Scheduling Models

Accurate and rapid output calculation of hydropower station (HS) is an important research item in reservoir dispatching neighborhood. There have existed many methods to calculate output in generation scheduling models with different time scale. But for the large HS with multiple units, it is still difficult to calculate output quickly and accurately in short-term generation dispatching. Therefore, in this paper, an improved method of water consumption rate (IWCR) considering aftereffects is proposed. The Three Gorges Hydropower Station (TGHS) in China is selected as the case study, and the prediction water consumption rate (WCR) results are obtained with IWCR and classical water consumption rate method (CWCR). The results show that 1) The mean absolute deviation (MAD) on the left and right bank of TGHS is significantly superior to the MAD calculated by CWCR, and reduce 0.578 m3/(s.wkw) and 0.569 m3/(s.wkw) respectively. 2) In low relative deviation interval, there are more prediction WCR periods with IWCR. Therefore, the IWCR method can lead to the plan scheme more consistent with actual operation process, and the security of TGHS and Gezhouba is stronger.

Irrigation regime and water consumption of potatoes in the Republic of Bashkortostan, depending on the reclamation condition of lands

2020 ◽  
Vol 0 (6) ◽  
pp. 13-19
Author(s):  
Guzel Gumerova ◽  
Georgiy Gulyuk ◽  
Dmitry Kucher ◽  
Anatoly Shuravilin ◽  
Elena Piven
Keyword(s):  
Water Consumption ◽  
Weather Conditions ◽  
Growing Season ◽  
Vegetation Period ◽  
Forest Steppe ◽  
Total Water ◽  
Total Water Consumption ◽  
Republic Of Bashkortostan ◽  
Irrigated Lands ◽  
The Republic

Data of long-term researches (2015–2018) in southern forest-steppe zone of the Republic of Bashkortostan, is justified theoretically and experimentally the mode of irrigation of potatoes on leached chernozems of unsatisfactory, satisfactory and good ameliorative condition of irrigated lands. For the growing periods of potatoes with different heat and moisture supply, the number of watering, the timing of their implementation, irrigation and irrigation norms are established. On lands with unsatisfactory meliorative state the number of irrigation depending on weather conditions of potato vegetation period varied from 0 to 3 (1.5 on average) with average irrigation norm – 990 m3/ha. With satisfactory meliorative state of lands the number of irrigation on average increased from 0 to 4 (2.3 on average) with irrigation norm – 1305 m3/ha. On lands with good meliorative state the number of irrigation was the highest – from 1 to 5 (3 on average) with average irrigation irrigation norm is 1653 m3/ha. It was noted that in the dry periods of potato vegetation the greatest number of watering was carried out (3–5 watering), and in the wet periods (2017) watering was not carried out except for the area with a good reclamation state, where only one irrigation was carried out by the norm of 550 m3/ha. Water consumption of potato was studied in dynamics as a whole during the growing season and the months of the growing season depending on weather conditions of vegetation period and land reclamation condition of irrigated lands, as well as in the control (without irrigation). The lowest total water consumption was in the area without irrigation and averaged 226.8 mm. In irrigated areas, its values increased to 319-353.4 mm. The average daily water consumption varied from 2.12 to 3.3 mm. The highest rates of potato water consumption were observed in June and July, and the lowest – in May and August. In the total water consumption of potatoes on the site without irrigation, the largest share was occupied by atmospheric precipitation and in addition to them the arrival of moisture from the soil. Irrigation water was used in irrigated areas along with precipitation, the share of which was 30.2–46.1 %.

Analyzing the Effect of Mandatory Water Restrictions on Water Usage

2020 ◽  
Vol 20 (2) ◽  
Author(s):  
Trey Dronyk-Trosper ◽  
Brandli Stitzel
Keyword(s):  
Water Use ◽  
Water Consumption ◽  
Water Rights ◽  
Water Usage ◽  
Total Water ◽  
Water Restriction ◽  
Way Of Life ◽  
Total Water Consumption ◽  
Water Restrictions

AbstractAs water rights and water usage become an ever more important part of municipalities’ and states’ way of life, it becomes important to understand what policies can be effective for encouraging conservation of water. One method that has been employed at various times and throughout numerous communities is to limit outdoor watering days. We use a dataset with over 3 million property-month observations during the 2007–2015 period in Norman, Oklahoma, to identify whether the periodic implementation of mandatory water restrictions reduces water usage. Our data allow us to exploit variance in the timing of these water restriction programs. Our findings indicate that this policy reduces water consumption by 0.7 % of total water consumption. Additionally, we use home assessment prices to identify heterogeneity in this response, finding that high priced homes are more responsive to water use restrictions.

Optimization of Two-Stage Closure Law of Turbine Wicket Gates and its Application

2012 ◽  
Vol 249-250 ◽  
pp. 636-641 ◽  
Author(s):  
Sheng Chen ◽  
Jian Zhang ◽  
Xiao Dong Yu
Keyword(s):  
Mathematical Model ◽  
Transient Process ◽  
Field Test ◽  
Hydropower Station ◽  
Two Stage ◽  
The Mathematical Model

Optimization of closure law is the priority selection in solving the guaranteed regulation calculation problems due to its simplicity and economy. This present study deals with the optimization of two-stage closure law of wicket gates, which has more advantages in control pressure and speed rise. The mathematical model of transient process is established by introducing the method of characteristic, whose correctness is validated by the field test. Then the model is applied to a specific hydropower station that only can employ closure law optimization to coordinate the contradiction between pressure and speed rise, for two-stage closure optimization. The achievements of the study can serve as a reference for similar projects.

Canopy-air temperature difference of winter wheat near-isogenic lines and its relationship with total water consumption by winter wheat grown under water deficit conditions

2019 ◽  
Vol 39 (1) ◽  
Author(s):  
梅旭荣 MEI Xurong ◽  
黄桂荣 HUANG Guirong ◽  
严昌荣 YAN Changrong ◽  
刘晓英 LIU Xiaoying ◽  
张欣莹 ZHANG Xinying ◽  
...  
Keyword(s):  
Winter Wheat ◽  
Water Deficit ◽  
Air Temperature ◽  
Temperature Difference ◽  
Water Consumption ◽  
Near Isogenic Lines ◽  
Total Water ◽  
Isogenic Lines ◽  
Total Water Consumption

Performance Analysis of Parallel Feed LT-MED Desalination System with Thermal Vapor Compressor

2011 ◽  
Vol 347-353 ◽  
pp. 3058-3063 ◽  
Author(s):  
Xiao Hua Liu ◽  
Guo Jian Cao ◽  
Sheng Qiang Shen ◽  
Guang Bin Zhao
Keyword(s):  
Mathematical Model ◽  
Flow Resistance ◽  
Tube Bundle ◽  
Steam Temperature ◽  
Heating Steam ◽  
Temperature Loss ◽  
Output Ratio ◽  
Actual Operation ◽  
The Cost ◽  
The Mathematical Model

This paper presents a theoretical analysis on parallel feed LT-MED desalination system with thermal vapor compressor which is helpful to the design and operation of such kind of seawater desalination plant. The mathematical model of a parallel feed LT-MED desalination system with thermal vapor compressor (TVC) is developed on the basis of the mass and energy conservation equations. In the model, the temperature loss is considered caused by the boiling point elevation (BPE) of seawater and the steam flow resistance is also included caused by flowing through tube bundle demisters and pipelines between adjacent evaporators. The property parameters of seawater are taken as the functions of temperature and concentration. A computer program is drawn up to solve the mathematical model. The calculation is based on the system with rated water production 3000 t/d. Taking actual operation into account, the influence of heating steam temperature of the first effect and entrained steam position of TVC on system performance are analyzed. The results show that when other relative parameters are fixed, the gained output ratio (GOR) and the total area of evaporators change slightly with the increasing of the heating steam temperature of first effect under the calculation condition of this paper. The results also demonstrate that there exist suitable entrained steam positions of TVC for the cost of water.

scholarly journals Total water consumption of cereals on the slopes of the Central District of Russia and zoned bioclimatic ratios

2020 ◽  
pp. 120-125
Author(s):  
N. N. Dubenok ◽  
R. V. Kalinichenko ◽  
M. V. Klimakhina ◽  
E. V. Matsyganova ◽  
K. B. Shumakova
Keyword(s):  
Soil Moisture ◽  
Water Balance ◽  
Water Consumption ◽  
Agricultural Land ◽  
Elevated Temperatures ◽  
Growing Season ◽  
Total Water ◽  
Total Water Consumption ◽  
Daily Water ◽  
Perennial Herbs

Relevance. In Russia the issue of resource-saving irrigation of agricultural land is one of the most urgent, and total water consumption is one of the most important elements of the water balance of irrigated territory. Analyze the basic methods of determining the total water consumption, determine the average daily water consumption, total water consumption and zonal bioclimatic ratios for oats, barley with planting perennial herbs and perennial herbs in the conditions of the Central Region of the Russian Federation. Materials and methods. The research was carried out on a stationary field experience in the Podolsk district of the Moscow District. To improve the individual elements of the water balance in these conditions were laid stationary water balancing sites (S=200 m2). The pre-21 thresholds for soil moisture was not less than 75%. The research was carried out in accordance with generally accepted methods and recommendations. Total water consumption during the growing season and in the phases of plant development was determined by the method of water balance. Results. The total water consumption of crops by elements of the slope varies significantly between the upper and lower elements of the slope difference is 12-15 mm, which should be taken into account when calculating irrigation regimes on sloped lands. At the top of the slope it is necessary to carry out 1-2 watering more than at the base of the slope. Differentiated watering along the length of the slope allows to save irrigation water by 10-15%. The water consumption of crops in the context of the experience was greater in April and September than in the other months of growing. This is due to climate indicators. Total evaporation from the soil and plant surfaces depends on soil moisture, crop condition, wind speed, temperature and humidity. In April and September, the study years showed elevated temperatures and low relative humidity. When comparing the average daily water consumption at irrigated areas at the top and at the base of the slope, it is seen that in all the months of vegetation it is more on the upper section by an average of 12%. Bioclimatic coefficients depend on humidity and air temperature. The zonal coefficients we have obtained allow us to determine the water consumption of crops, both in each growing season and in general for vegetation.

scholarly journals A New Method for Reducing Collapsibility of Loess Foundation with Thicker Deposit: The Borehole Preimmersion Method

2021 ◽  
Vol 2021 ◽  
pp. 1-15
Author(s):  
Bin Zhi ◽  
Xiaochan Wang ◽  
Pingping Wei ◽  
Zengyue Li ◽  
Pan Wang ◽  
...  
Keyword(s):  
Water Consumption ◽  
Diffusion Mechanism ◽  
Water Injection ◽  
Immersion Test ◽  
Calculation Model ◽  
New Method ◽  
Total Water ◽  
Injection Hole ◽  
Total Water Consumption ◽  
New Perspective

At present, there are some key issues in the traditional preimmersion method for reducing the collapsibility of the loess ground, such as the difficulty in determining the total water consumption and the long immersion time. In response to these issues, a new method, the borehole preimmersion method, is presented, and a specific theoretical design model is proposed for application in projects. The method is specifically discussed from a new perspective, and the diffusion mechanism and evolution law of water in the ground are presented in detail through theoretical analysis and numerical calculation, respectively. The water diffusion is a mushroom-type form for a single water injection hole immersed in water. A calculation model derived for a single water injection hole or a group of water injection holes based on the research results is used to calculate the volumes of soaked loess and the total water consumption. Through an in situ immersion test, the treatment effect of this method is evaluated to verify the rationality of the method and the theoretical calculation model proposed in this study, which provides a new method and theoretical framework for effectively reducing the collapsibility of the loess ground.

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