scholarly journals GROWTH OF AUSTRALIAN CRAYFISH (CHERAX QUADRICARINATUS) JUVENILES IN INDUSTRIAL CONDITIONS DEPENDING ON THE ENVIRONMENT TEMPERATURE

2018 ◽  
pp. 98-103
Author(s):  
Dina Ilyinichna Shokasheva
Keyword(s):  
Water Supply ◽  
Water Temperature ◽  
Maximum Efficiency ◽  
Water Supply Systems ◽  
Cherax Quadricarinatus ◽  
Circulating Water ◽  
Larval Stages ◽  
Study Results ◽  
Environment Temperature ◽  
Fish Tank

The article presents study results of the influence of water temperature on the growth and evolution of juveniles of the Australian red claw crayfish ( Cherax quadricarinatus ) in circulating water supply systems. There have been analyzed 750 specimens of crayfish larvae and 150 juveniles, which were contained in large fish tanks, each with 200 l capacity. Each fish tank had autonomous system water purification and thermal regulation: 24.0; 28.0 and 31.0°С. Duration of test made 63 days. It was found that maximum efficiency of juvenile-stock rearing of crayfish can be achieved under the temperature 25.0-27.0°С. Growth rate of crayfish decreased and their survivalship was lower than threshold values under the temperature 30.0°С and higher. Insignificant changes of the temperature regime of the Australian crayfish juvenile habitat within the bounds of biological normal interval exert a significant impact on the results of their breeding both at an early nascent stage, beginning from the first larval stages, and more recent stages of the ontogenesis. It has been proved that water temperature has effect not only on the weight and linear growth, but also on the survivalship of the Australian crayfish juvenile. It has been observed that under 30.0°С survivalship of young crayfish decreased in two times during the first five days in circulating water supply units. For this reason in providing of industrial rearing of early juveniles of the Australian crayfish it should be taken into account that planned withdrawal at the first two-three months could make up to 50% from the initial number of larvae.

scholarly journals Development and validation of a drinking water temperature model in domestic drinking water supply systems

2017 ◽  
Vol 14 (10) ◽  
pp. 1031-1037 ◽  
Author(s):  
Ljiljana Zlatanovic ◽  
Andreas Moerman ◽  
Jan Peter van der Hoek ◽  
Jan Vreeburg ◽  
Mirjam Blokker
Keyword(s):  
Drinking Water ◽  
Water Supply ◽  
Water Temperature ◽  
Drinking Water Supply ◽  
Water Supply Systems ◽  
Temperature Model ◽  
Development And Validation ◽  
Supply Systems

scholarly journals METHODS OF SALT CONTENT STABILIZATION IN CIRCULATING WATER SUPPLY SYSTEMS

2017 ◽  
Vol 11 (2) ◽  
pp. 242-246 ◽  
Author(s):  
Volodymyr Shmandiy ◽  
◽  
Lilija Bezdeneznych ◽  
Olena Kharlamova ◽  
Anatoliy Svjatenko ◽  
...  
Keyword(s):  
Water Supply ◽  
Salt Content ◽  
Water Supply Systems ◽  
Circulating Water ◽  
Supply Systems

scholarly journals Experience of using the NALCO 1392 scale inhibitor in the circulating water supply system of the Novovoronezh NPP

2021 ◽  
Vol 7 (2) ◽  
pp. 85-89
Author(s):  
Dmitry M. Dronov ◽  
Aleksandr V. Gontovoy ◽  
Yelena N. Sarkisyan ◽  
Natalya V. Karandeeva
Keyword(s):  
Heat Exchange ◽  
Water Supply ◽  
Cooling Water ◽  
Cost Effective ◽  
Supply System ◽  
Water Supply System ◽  
Water Supply Systems ◽  
Mineral Salts ◽  
Circulating Water ◽  
Internal Surfaces

Power facilities use large amounts of water to cool steam in the steam turbine condensers, and lubricating oils, gas and air in turbine sets. The key requirement for the quality of cooling water is to ensure normal vacuum in condensers. Cooling water must not form mineral and biological deposits and corrosion products in the system. Deposits of mineral salts in the condenser tube system, as well as in auxiliary cooling systems, lead to deterioration in heat exchange and a major decrease in the cost effectiveness of the power equipment operation, and require the heat-exchange equipment to be periodically cleaned. The source water used for cooling is normally taken from nearby water bodies (large rivers or lakes). Circulating water supply systems are used most commonly: these systems use repeatedly the same water inventory for cooling, and require only small amounts of water added to make up for evaporation losses. Coolers, in this case, are cooling towers, spray pools and evaporation ponds. The water chemistry should ensure the operation of equipment without any damage to its components or the loss of efficiency caused by the corrosion of the internal surfaces as well as without scale and sludge formation. It is exactly when using circulating water supply that a stabilizing treatment program is the most practicable way to ensure a cost-effective and environmentally friendly mode of operation. To inhibit scaling processes on the heat-exchange surfaces of the turbine condenser tubes at the Novovoronezh NPP’s unit 5, the cooling water was treated with the NALCO 1392 inhibitor. The results of the NALCO 1392 inhibitor pilot tests in the circulating water supply system (with a cooling pool) are presented.

Способ управления давлением в системе водоснабжения

2020 ◽  
Author(s):  
R. Khadeev
Keyword(s):  
Water Supply ◽  
Control Systems ◽  
Pressure Control ◽  
Maximum Efficiency ◽  
Water Supply Systems ◽  
Flow Rates ◽  
Minimum Flow ◽  
Municipal Water Supply ◽  
Industrial Enterprises ◽  
Pumping Stations

Предложен способ управления напором в сети при работе насосных станций второго подъема. Устройство состоит из асимметричного планетарного дифференциала, соединенного с электроиндукционной силовой муфтой скольжения. Способ позволяет сохранить максимальный коэффициент полезного действия насоса и обеспечить экономичность его работы во всем диапазоне регулирования. Устройство регулятора напора в сети можно оценить, сравнив расчетную величину его коэффициента полезного действия, который составляет не менее 94 для минимальных значений расхода, при которых регулирование сильно затруднено. При оптимальных расходах системы ощутимые потери отсутствуют. Синхронный электродвигатель наиболее устойчив к перегрузкам, а при минимальных расходах обеспечивает необходимый напор, потребляя минимальное количество электроэнергии и сохраняя при этом свои номинальные обороты. Механизм был реализован в моделях и подтверждает заявленные параметры. Пока такая схема регулирования не была апробирована на реальных объектах, и не исследованы ее технико-экономические параметры. Она может быть применена в системах регулирования напора городской линии водоснабжения, в системах регулирования на предприятиях и в установках индивидуального обеспечения водой в частном доме.A method for pressure control in the network during the operation of pumping stations of the second elevation is proposed. The device consists of an asymmetric planetary differential connected to an eddy-current slip clutch. The method provides for maintaining the maximum efficiency and economic operation of the pump in the entire regulating range. The design of the pressure regulator in the network can be estimated by comparing the calculated efficiency value that is at least 94 for the minimum flow rates whereby the regulation is very difficult. At the optimal flow rates in the system there are no tangible losses. The synchronous electric motor is most resistant to overloads while at the minimum flow rates it provides for the required pressure consuming the minimum amount of electricity and at the same time maintaining the rated rpm. The mechanism was implemented in models and proved the claimed parameters. The presented control scheme neither has been approbated at existing facilities, nor its technical and economic parameters have been investigated, so far. It can be used in pressure control systems of a municipal water supply system, in control systems at industrial enterprises and in individual water supply systems in private houses.

scholarly journals Performance Study of an Integrated Solar Water Supply System for Isolated Agricultural Areas in Thailand: A Case-Study of the Royal Initiative Project

Water ◽  
2020 ◽  
Vol 12 (9) ◽  
pp. 2438 ◽  
Author(s):  
Thanongsak Imjai ◽  
Kamon Thinsurat ◽  
Pakorn Ditthakit ◽  
Warit Wipulanusat ◽  
Monthian Setkit ◽  
...  
Keyword(s):  
Water Supply ◽  
Tracking System ◽  
Supply System ◽  
Water Supply System ◽  
Water Supply Systems ◽  
Performance Study ◽  
Solar Water ◽  
Study Results ◽  
Agricultural Areas

This article presents a field-performance investigation on an Integrated Solar Water Supply System (SWSS) at two isolated agricultural areas in Thailand. The two case-study villages (Pongluek and Bangkloy) have experienced severe draughts in recent decades, and, therefore, water supply has become a major issue. A stand-alone 15.36 kW solar power and a 15 kW solar submersible pump were installed along with the input power generated by solar panels supported by four solar trackers. The aim is to lift water at the static head of 64 and 48 m via a piping length of 400 m for each village to be stored in 1000 and 1800 m3 reservoirs at an average of 300 and 400 m3 per day, respectively, for Pongluek and Bangkloy villages. The case study results show that the real costs of electricity generated by SWSS using solar photovoltaic (PV) systems intergraded with the solar tracking system yield better performance and are more advantageous compared with the non-tracking system. This study illustrates how system integration has been employed. System design and commercially available simulation predictions are elaborated. Construction, installation, and field tests for SWSS are discussed and highlighted. Performances of the SWSS in different weather conditions, such as sunny, cloudy, and rainy days, were analysed to make valuable suggestions for higher efficiency of the integrated solar water supply systems.

scholarly journals Performance Study of Integrated Solar-Water Supply System for Isolated Agricultural Areas in Thailand: Two Case-Study Villages of The Royal Initiative Project

2020 ◽  
Author(s):  
Thanongsak Imjai ◽  
Kamon Thinsurat ◽  
Pakorn Ditthakit ◽  
Warit Wipulanusat ◽  
Monthian Setkit ◽  
...  
Keyword(s):  
Water Supply ◽  
Tracking System ◽  
Supply System ◽  
Water Supply System ◽  
Water Supply Systems ◽  
Solar Pv ◽  
Solar Water ◽  
Study Results ◽  
Agricultural Areas

This article presents a field-performance investigation on an Integrated Solar Water Supply System (SWSS) at two isolated agricultural areas in Thailand. The two case-study villages (Pongluek and Bangkloy ) have experienced severe draughts in the last decades, and therefore water supply has become a major issue. A stand-alone 15.36 kW solar power and a 15 kW solar submersible pump were installed along with the input power generated by solar panels supported by four solar trackers. The aim is to lift water at the static head of 64 and 48 m via piping length of 400 metres for each village to be stored in 1,000 m3 and 1,800 m3 reservoirs at an average of 300 m3 and 400 m3 per day, respectively for Pongluek and Bangkloy villages. The case study results have shown that the real costs of electricity generated by SWSS using solar PV systems intergraded with the solar tracking system yield better performance and are more advantageous compared with the non-tracking system. This study illustrates how system integration has been employed. System design and commercially available simulation predictions are elaborated. Construction, installation, and field tests for SWSS are discussed and highlighted. Performances of the SWSS in different weather conditions such as sunny, cloudy, and rainy days were analysed to make valuable suggestions for higher efficiency of the integrated solar water supply systems.

ELECTRICITY LOAD PREDICTION FOR WATER SUPPLY SYSTEMS

2008 ◽  
Vol 7 (4) ◽  
pp. 453-458
Author(s):  
Mihai Gavrilas ◽  
Gilda Gavrilas ◽  
Ovidiu Ivanov
Keyword(s):  
Water Supply ◽  
Water Supply Systems ◽  
Load Prediction ◽  
Electricity Load ◽  
Supply Systems
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