Search Results

1 - 10 of 58 items :

  • "Storage tank" x
Clear All
Research of Operation Modes of Heat Storage Tank in CHP Plant Using Numerical Simulation

stratification. Applied Energy , 2009, vol. 86, p. 1465-1469. Jordan, U., Furbo, S. Thermal stratification in small solar domestics storage tanks caused by draw-offs. Solar Energy , 2005, vol. 78, p. 291-300. Spur, R., Fiala, D., Nevrala, D., Probert, D. Performance of modern domestic hot-water stores. Applied Energy , 2006, vol. 83, p. 893-910. Hvide Sande District Heating [Online] [Accessed 14.07.2011]. Available: http

Open access
Seismic Resistance of Storage Tanks Containing Liquid in Accordance with Principles of Eurocode 8 Standard

References [1] Eurocode 8 - Design of Structures for Earthquakes Resistance: Part 4 - Silos, tanks and pipelines, European Committee for Standardization, Brussels, 1998. [2] G. W. Housner, Earthquake Pressures on Fluid Containers, California Institute of Technology, California, 1954. [3] A. R. Ibrahim, Liquid Sloshing Dynamics Theory and Applications, Cambridge University Press, 2005. [4] P. K. Malhotra, T. Wenk, M. Wieland, Simple Procedure for Seismic Analysis of Liquid Storage Tanks, in

Open access
Fluid Flow Control in Domestic Hot Water Systems During Days with Different Radiative Stability Levels

storage tanks Energy Conversion and Management 49 ( 2008) 169–184 [5] V. Badescu, S. Budea, M. Paulescu. Empirical versus optimal control of flow in solar domestic hot water systems. J Energ Eng. 2015, 142 (3) (2015), 15-38 [6] S. Budea, V. Bădescu. Improving the Performance of Systems with Solar Water Collectors Used in Domestic Hot Water Production, Energy Procedia, 112 (2017), 398-403 [7] J. A. Duffie, W.A. Beckman Solar energy thermal processes (New York: Wiley) (1991) [8] I. G. Carabogdan et al. Industrial thermal installations

Open access
Experimental Analysis of Thermal Stratification in a Heat Storage Tank Using Stratification Pipe

. Rodriquez I., Consul R., Perez - Segarra, Soria M. Virtual prototyping of storage tanks by means of three-dimensional CFD and heat transfer numerical simulations // Solar energy. - Nr.77 (2004), 13 p. Ciemiņš R., Nagla J., Saveļjevs P. Siltumtehnika. - Rīga: Zvaigzne, 1967. - 454 lpp. Boloņina A. Termiskā stratifikācija siltuma akumulācijas tvertnēs // magistra darbs. - Rīgas Tehniskā universitāte (2008) Rochas C. Experimental analysis of solar combisystems. Optimization // phD. - thesis. - Riga

Open access
Analysis of Combined Sewer Flow Storage Scenarios Prior to Wastewater Treatment Plant

Abstract

Combined sewer systems in cities are increasingly equipped with additional storage facilities or other installations necessary for keeping the wastewater treatment plants from overloading during wet weather and reducing combined sewer overflows into receiving waters. Effective methods for reducing such negative phenomena include the temporary storage of wet weather flow in an end-of-pipe separate tank or in a sewer system. In this paper, four scenarios of wastewater storage for the Group Wastewater Treatment Plant (GWWTP) in Lodz (Poland) have been analysed: a storage in a separate single tank located in GWWTP, a storage in the bypass channel in GWWTP, in-sewer storage, and a combination of the aforementioned variants, also with real time control (RTC) system introduced. The basic calculations were performed using the EPA’s SWMM software for the period of 5 years (2004-2008). The chosen solution - storage in a separate storage tank - has been verified based on the inflow dataset from the years 2009-2013. The specific volume of the separate storage tank should be at least 22 m3 per hectare of impervious catchment area, but it could be reduced if additional in-sewer storage with RTC were introduced. Both options allow the effective protection of receiving waters against discharge of untreated sewage during wet weather.

Open access
Non-linear model predictive control of conically shaped liquid storage tanks

Abstract

This paper deals with the analysis and design of a model predictive control (MPC) strategy used in connection with level control in conically shaped industrial liquid storage tanks. The MPC is based on a non-linear dynamic model describing changes of the liquid level concerning changes in the inlet flow of the liquid. Euler discretization of the dynamic system was applied to transform con-tinuous time dynamics to its discrete-time counterpart used in non-linear MPC (NMPC) design. By means of a simulation case study, NMPC has been shown to track the changes of the liquid level, hence provides increased control performance. This paper also compares the traditional approach of optimal control, linear MPC, with the NMPC strategy.

Open access
The Evaluation of Feasibility of Thermal Energy Storage System at Riga TPP-2

Abstract

The installation of thermal energy storage system (TES) provides the optimisation of energy source, energy security supply, power plant operation and energy production flexibility. The aim of the present research is to evaluate the feasibility of thermal energy system installation at Riga TPP–2. The six modes were investigated: four for non-heating periods and two for heating periods. Different research methods were used: data statistic processing, data analysis, analogy, forecasting, financial method and correlation and regression method. In the end, the best mode was chosen – the increase of cogeneration unit efficiency during the summer.

Open access
Mathematical modeling of large floating roof reservoir temperature arena

LITERATURE CITED 1. Wei, S. & Qinglin, C. et al. (2016). Research on the variation law of heating temperature field and the effective energy utilization rate of a steam coil for the floating roof tank. Numerical Heat Trans. 70, 1345–1355. 2. Nurten, V. (2003). Numerical analysis of the transient turbulent flow in a fuel oil storage tank. Int. J. Therm. Sci. 46, 3429–3440. DOI: 10.1016/S0017-9310(03)00145-5. 3. Wang, M., Zhang, X. & Yu, G. et al. (2017). Numerical study on the temperature drop characteristics of waxy crude oil in a double

Open access
Electricity Market Liberalisation and Flexibility of Conventional Generation to Balance Intermittent Renewable Energy – Is It Possible to Stay Competitive?

. (2016). The realization of n-ergie heat storage tank project in nuremberg district heating system. Enerģija un Pasaule . No. 3, 40–44. 6. Zigurs, A., Kunickis, M., Linkevics, O., Stuklis, I., Ivanova, P., and Balodis, M. (2015). Evaluation of exhaust gas condensing economizer installation at riga chp plants. REHVA Annual Conference 2015 , 6–9 May 2015 (pp. 149–154). Riga, LV: RTU Press. 7. International Energy Agency (IEA). (2014). Energy technology perspectives 2014. Harnessing electricity’s potential. France: OECD/IEA. 8. GE Energy (2011

Open access
Effect of settlement of foundations on the failure risk of the bottom of cylindrical steel vertical tanks for liquids

). Comparison of design methods for a tank-bottom annular plate and concrete ringwall. International Journal of Pressure Vessels and Piping 77, p. 511-517. 10.1016/S0308-0161(00)00055-7 Wu T.Y. Liu G.R. 2000 Comparison of design methods for a tank-bottom annular plate and concrete ringwall International Journal of Pressure Vessels and Piping 77 511 517 [6] Lenzi M., Campana P. (2008). Ovalization of Steel Storage Tanks as a Result of Differential Settlements Structural Engineering International , Volume 18, No. 4. Lenzi M. Campana P. 2008

Open access