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Modular heat storage in waste heat recovery installations

Piotr Górszczak Marcin Rywotycki Marcin Hojny Grzegorz Filo
Archives of Thermodynamics | 2023 | vol. 44 | No 3 | 301-323 | DOI: 10.24425/ather.2023.147548
Keywords heat storage heat recovery waste heat CFD
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Abstract

The paper presents the methodology of designing a system for accumulating waste heat from industrial processes. The research aimed to analyse the fluid’s movement in the heat accumulator to unify the temperature field in the volume of water constituting the heat buffer. Using the computer program Ansys Fluent, a series of computational fluid dynamics simulations of the process of charging the heat storage with water at 60°C, 70°C, and 80°C was carried out. The selected temperatures correspond to the temperature range of unmanaged waste heat. In the presented solution, heat storage is loaded with water from the cooling systems of industrial equipment to store excess heat and use it at a later time. The results of numerical calculations were used to analyse the velocity and temperature fields in the selected structure of the modular heat storage. A novelty in the presented solution is the use of smaller modular heat storage units that allow any configuration of the heat storage system. This solution makes it possible to create heat storage with the required heat capacity.
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Authors and Affiliations

Piotr Górszczak
1
Marcin Rywotycki
1
Marcin Hojny
1
Grzegorz Filo
2
  1. AGH University of Krakow, Mickiewicza 30, 30-059 Kraków, Poland
  2. Cracow University of Technology, Jana Pawła II 37, 31-864 Kraków, Poland

A concrete heat accumulator for use in solar heating systems Ů a mathematical model and experimental verification

J. Sacharczuk D. Taler
Archives of Thermodynamics | 2014 | No 3 September | 281-295
Keywords heat storage solar heating system control volume finite element method
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Abstract

The article presents a numerical model of the concrete heat accumulator for solar heating systems. Model uses control volume finite element method with an explicit solution method for time integration. The use of an explicit method is an essential advantage in the simulation of time-dependent changes in temperature of the air at the accumulator inlet. The study compares the results of numerical model calculations of the accumulator heating with experimental measurements and with computational fluid dynamics modeling. The comparison shows a good correlation between the results of calculation using the model and the results of measurements.
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Authors and Affiliations

J. Sacharczuk
D. Taler

Selected issues related to heat storage tank modelling and optimisation aimed at forecasting its operation

Grzegorz Niewiński Krzysztof Badyda Wojciech Bujalski Michał Warchoł
Archives of Thermodynamics | 2011 | No 3 December | 3-31 | DOI: 10.2478/v10173-011-0010-8
Keywords Optimisation Heat accumulator Heat storage tank Mathematical modelling CHP
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Abstract

The paper presents results of research focused on modelling heat storage tank operation used for forecasting purposes. It presents selected issues related to mathematical modelling of heat storage tanks and related equipment and discusses solution process of the optimisation task. Presented detailed results were obtained during real-life industrial implementation of the optimisation process at the Siekierki combined heat and power (CHP) plant in Warsaw owned by Vattenfall Heat Poland S.A. (currently by Polish Oil & Gas Company - PGNiG SA) carried out by the Academic Research Centre of Power Industry and Environment Protection, Warsaw University of Technology in collaboration with Transition Technologies S.A. company.

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Authors and Affiliations

Grzegorz Niewiński
Krzysztof Badyda
Wojciech Bujalski
Michał Warchoł

Initial assessment of the possibility of using ATES technology in Poland by low-temperature heat and cold consumers

Maciej Miecznik Robert Skrzypczak
Polityka Energetyczna - Energy Policy Journal | 2019 | vol. 22 | No 1 | 39-58
Keywords Aquifer Thermal Energy Storage ATES heat storage in aquifers underground storage of heatand cold
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Abstract

The aim of the article is a preliminary assessment of the possibility of using ATES (Aquifer Thermal Energy Storage) technology for the seasonal storage of heat and cold in shallow aquifers in Poland. The ATES technology is designed to provide low-temperature heat and cold to big-area consumers. A study by researchers from the Delft University of Technology in the Netherlands indicates very favorable hydrogeological and climate conditions in most of Poland for its successful development. To confirm this, the authors used public hydrogeological data, including information obtained from 1324 boreholes of the groundwater observation and research network and 172 information sheets of groundwater bodies (GWBs). Using requirements for ATES systems, well-described in the world literature, the selection of boreholes was carried out in the GIS environment, which allowed aquifers that meet the required criteria to be captured. The preliminary assessment indicates the possibility of the successful implementation of ATES technology in Poland, in particular in the northern and western parts of the country, including the cities of: Gdańsk, Warsaw, Wrocław, Bydgoszcz, Słupsk, and Stargard.

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Authors and Affiliations

Maciej Miecznik
Robert Skrzypczak

Hybrid nano improved phase change material for latent thermal energy storage system: Numerical study

Mohamed Lamine Benlekkam Driss Nehari
Archive of Mechanical Engineering | 2022 | vol. 69 | No 1 | 77-98 | DOI: 10.24425/ame.2022.140410
Keywords phase change material (PCM) latent heat storage melting and solidification thermal energy storage hybrid nano-particles LHTESS
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Abstract

The phase change materials (PCM) are widely used in several applications, especiallyi n the latent heat thermal energy storage system (LHTESS). Due to the very low thermal conductivity of PCMs. A small mass fraction of hybrid nanoparticles TiO 2–CuO (50%–50%) is dispersed in PCM with five mass concentrations of 0%, 0.25%, 0.5%, 0.75% and 1 mass % to improve its thermal conductivity. This article is focused on thermal performance of the hybrid nano-PCM (HNPCM) used for the LHTESS. A numerical model based on the enthalpy-porosity technique is developed to solve the Navier-Stocks and energy equations. The computations were conducted for the melting and solidification processes of the HNPCM in a shell and tube latent heat storage (LHS). The developed numerical model was validated successfully with experimental data from the literature. The results showed that the dispersed hybrid nanoparticles improved the effective thermal conductivity and density of the HNPCM. Accordingly, when the mass fraction of a HNPCM increases by 0.25%, 0.5%, 0.75% and 1 mass %, the average charging time improves by 12.04 %, 19.9 %, 23.55%, and 27.33 %, respectively. Besides, the stored energy is reduced by 0.83%, 1.67%, 2.83% and 3.88%, respectively. Moreover, the discharging time was shortened by 18.47%, 26.91%, 27.71%, and 30.52%, respectively.
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Authors and Affiliations

Mohamed Lamine Benlekkam
1 2
ORCID: ORCID
Driss Nehari
3
ORCID: ORCID
  1. Department of Science and Technology, University of Tissemsilt, Tissemsilt, Algeria
  2. Laboratory of Smart Structure, University of Ain Temouchent, Ain Temouchent, Algeria
  3. Laboratory of Hydrology and Applied Environment, University of Ain Temouchent, Algeria

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