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A system for monitoring and controlling a thermal energy store and an energy capture system

P. Pietkiewicz K. Nalepa W. Miąskowski M. Wilamowska-Korsak
Bulletin of the Polish Academy of Sciences Technical Sciences | 2018 | 66 | No 6 (Special Section on Deep Learning: Theory and Practice) | 941-946 | DOI: 10.24425/bpas.2018.125942
Keywords energy storage phase change materials SCADA MHI energy monitoring
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Authors and Affiliations

P. Pietkiewicz
K. Nalepa
W. Miąskowski
M. Wilamowska-Korsak

Transient analysis of heat transfer across the residential building roof with PCMand wood wool- A case study by Numerical simulation approach

D. Prakash P. Ravikumar
Archives of Civil Engineering | 2013 | No 4 | 483-497
Keywords heat transfer Residential building roof Phase change material Wood wool Numerical simulation
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Abstract

In this paper, transient analysis on heat transfer across the residential building roof having various materials like wood wool, phase change material and weathering tile is performed by numerical simulation technique. 2-dimensional roof model is created, checked for grid independency and validated with the experimental results. Three different roof structures are included in this study namely roof with (i). Concrete and weathering tile, (ii). Concrete, phase change material and weathering tile and (iii). Concrete, phase change material, wood wool and weathering tile. Roof type 3 restricts 13% of heat entering the room in comparison with roof having only concrete and weathering tile. Also the effect of various roof layers’ thickness in the roof type 3 is investigated and identifi ed that the wood wool plays the major role in arresting the entry of heat in to the room. The average reduction of heat is about 10% for an increase of a unit thickness of wood wool layer.

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Authors and Affiliations

D. Prakash
P. Ravikumar

The modified XFEM for solving problems of a phase change with natural convection

Paweł Stąpór
Archive of Mechanical Engineering | 2019 | vol. 66 | No 3 | 273-294 | DOI: 10.24425/ame.2019.129676
Keywords phase change natural convection extended finite element method level set method
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Abstract

This paper presents an extended finite element method applied to solve phase change problems taking into account natural convection in the liquid phase. It is assumed that the transition from one state to another, e.g., during the solidification of pure metals, is discontinuous and that the physical properties of the phases vary across the interface. According to the classical Stefan condition, the location, topology and rate of the interface changes are determined by the jump in the heat flux. The incompressible Navier-Stokes equations with the Boussinesq approximation of the natural convection flow are solved for the liquid phase. The no-slip condition for velocity and the melting/freezing condition for temperature are imposed on the interface using penalty method. The fractional four-step method is employed for analysing conjugate heat transfer and unsteady viscous flow. The phase interface is tracked by the level set method defined on the same finite element mesh. A new combination of extended basis functions is proposed to approximate the discontinuity in the derivative of the temperature, velocity and the pressure fields. The single-mesh approach is demonstrated using three two-dimensional benchmark problems. The results are compared with the numerical and experimental data obtained by other authors.

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Authors and Affiliations

Paweł Stąpór
1
  1. Faculty of Management and Computer Modelling, Kielce University of Technology, Kielce, Poland.

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

Multi-objective optimization of PCM-fin structure for staggered Li-ion battery packs

Chenghui Qiu Chongtian Wu Xiaolu Yuan Linxu Wu Jiaming Yang Hong Shi
Bulletin of the Polish Academy of Sciences Technical Sciences | 2023 | 71 | 4 | e145677 | DOI: 10.24425/bpasts.2023.145677
Keywords staggered arrangement phase change material fin entropy weight-TOPSIS multi-objective optimization thermal management
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Abstract

Endurance capability is a key indicator to evaluate the performance of electric vehicles. Improving the energy density of battery packs in a limited space while ensuring the safety of the vehicle is one of the currently used technological solutions. Accordingly, a small space and high energy density battery arrangement scheme is proposed in this paper. The comprehensive performance of two battery packs based on the same volume and different space arrangements is compared. Further, based on the same thermal management system (PCM-fin system), the thermal performance of staggered battery packs with high energy density is numerically simulated with different fin structures, and the optimal fin structure parameters for staggered battery packs at a 3C discharge rate are determined using the entropy weight-TOPSIS method. The result reveals that increasing the contact thickness between the fin and the battery (X) can reduce the maximum temperature, but weaken temperature homogeneity. Moreover, the change of fin width (A) has no significant effect on the heat dissipation performance of the battery pack. Entropy weight-TOPSIS method objectively assigns weights to both maximum temperature (Tmax) and temperature difference (DT) and determines the optimal solution for the cooling system fin parameters. It is found that when X = 0:67 mm, A = 0:6 mm, the staggered battery pack holds the best comprehensive performance.
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Authors and Affiliations

Chenghui Qiu
1
Chongtian Wu
1
Xiaolu Yuan
1
Linxu Wu
1
Jiaming Yang
1
Hong Shi
1
ORCID: ORCID
  1. College of Energy & Power Engineering, Jiangsu University of Science and Technology, Zhenjiang, Jiangsu, 212003, P.R. China

Performance analysis and PCM selection for adsorption chiller aided by energy storage supplied from the district heating system

Jarosław Karwacki Roman Kwidziński Piotr Leputa
Archives of Thermodynamics | 2022 | vol. 43 | No 4 | 135-169 | DOI: 10.24425/ather.2022.144409
Keywords Thermal sorption cooling Phase change material thermal energy storage district heating Adsorption energy management mathematical modelling Load shifting efficiency
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Abstract

The paper presents a theoretical analysis of thermal energy storage filled with phase change material (PCM) that is aimed at optimization of an adsorption chiller performance in an air-conditioning system. The equations describing a lumped parameter model were used to analyze internal heat transfer in the cooling installation. Those equations result from the energy balances of the chiller, PCM thermal storage unit and heat load. The influence of the control of the heat transfer fluid flow rate and heat capacity of the system components on the whole system operation was investigated. The model was used to validate the selection of Rubitherm RT62HC as a PCM for thermal storage. It also allowed us to assess the temperature levels that are likely to appear during the operation of the system before it will be constructed.
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Authors and Affiliations

Jarosław Karwacki
1
Roman Kwidziński
1
Piotr Leputa
1 2
  1. The Szewalski Institute of Fluid Flow Machinery, Polish Academy of Sciences, Heat Transfer Department, Fiszera 14, 80-231 Gdansk, Poland
  2. ENERGA Ciepło Ostrołeka Sp. z o.o., Celna 13, 07-410 Ostrołeka, Poland

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