Influence of Heat Accumulation of the Object on the Operation of the Cooled Ceilings Cooling System

Rimár, Miroslav; Fedak, Marcel; Kulikov, Andrii; Krenický, Tibor; Kulikova, Olha

doi:10.17973/mmsj.2022_10_2022055

Cited by 3 publications

(3 citation statements)

References 7 publications

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“…The liquid fraction β is defined as follows: (8) L is latent heat. The latent heat density varies between the solid state (a value equal to zero) and the liquid state.…”

Section: Numerical Modelmentioning

confidence: 99%

See 1 more Smart Citation

Techniques for Enhancing Thermal Conductivity and Heat Transfer in Phase Change Materials in Hybrid Phase Change Material–Water Storage Tanks

Shmyhol,

Rimár,

Fedak

et al. 2024

Applied Sciences

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In recent years, extensive research has been dedicated to enhancing energy efficiency and promoting environmental sustainability in heating and cooling systems. Among the promising solutions, phase change materials (PCM) technology stands out as a key area of exploration. This study focuses on improving the thermal performance of PCM–water hybrid tanks by investigating methods to enhance thermal conductivity and heat transfer. Through experimental testing using techniques such as copper matrices, steel twisted matrices, and copper spirals, this study demonstrates significant improvements in thermal conductivity, particularly with the use of copper matrices. The integration of a copper matrix placed in the PCM reservoir increased the heat transfer coefficient and thermal conductivity of the PCM, and thus, the total phase transformation time for solidification was reduced by 79.19% and for melting by 54.7%. Our experimental results demonstrate that the integration of a copper matrix can increase latent heat transfer from 55,677.6 J up to 125,274.6 J, marking a 125% enhancement over the experiment with pure PCM. Additionally, comparisons of the energy storage potentials for different PCMs underscore the benefits of integrating PCMs into hybrid storage tanks. These findings highlight the immense potential of PCM technology to increase energy storage efficiency in heating and cooling applications.

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“…The liquid fraction β is defined as follows: (8) L is latent heat. The latent heat density varies between the solid state (a value equal to zero) and the liquid state.…”

Section: Numerical Modelmentioning

confidence: 99%

“…Active PCM-TES systems (underfloor heating, PCM ceiling slabs and other systems) and passive PCM-TES systems (PCM slab walls, PCM shutters, PCM building blocks, air heating systems, underfloor heating, ceiling slabs, etc.) have high potential to reduce the heating load in buildings [4,[6][7][8][9][10].…”

Section: Introductionmentioning

confidence: 99%

Techniques for Enhancing Thermal Conductivity and Heat Transfer in Phase Change Materials in Hybrid Phase Change Material–Water Storage Tanks

Shmyhol,

Rimár,

Fedak

et al. 2024

Applied Sciences

Self Cite

View full text Add to dashboard Cite

show abstract

“…Current measuring devices are manufactured according to customer or industry-specific requirements [6,7], the municipal sector or laboratories [8,9,10] or research purposes. It is important to measure the flow rates for immediate adjustment of the optimum parameters of a given process, such as for example in combustion of combustion air and fuel flow [9] or for overflows in cooling systems [11,12] or monitoring and diagnostics [13] of the monitored processes and processes.…”

Section: Introductionmentioning

confidence: 99%

Experimental Devices for Measuring Small Gas Flows

Polivka¹,

Kizek²,

Rimár³

et al. 2022

ATPET

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In this paper, the authors present the design of an experimental device for measuring small flow rates of gaseous media. For the design and construction, materials were used to create a local pressure resistance and thus allow the pressure gradient to be measured upstream and downstream of the measuring element. The proposed measuring devices can serve as an alternative to actual measuring devices for detecting the instantaneous quantity flowing in the measuring assembly. The results obtained from the experimental measurements are used to determine the characteristics of the proposed measuring elements. The aim is to establish dependencies that will serve for the use of the proposed measuring elements for research and educational purposes.

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Influence of the Building’s Thermal Insulation on Intermittent Heating Mode Efficiency

Balasanian,

Klymchuk,

Luzhanska

et al. 2024

Management Systems in Production Engineering

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The results of mathematical modeling of a building’s thermal insulation influence on the efficiency of intermittent heating mode are presented. This work aim is to assess the influence of thermal insulation on the efficiency of using the intermittent heating mode for the educational building of the Odessa National Polytechnic University’s Heat Engineering Laboratory. The paper analyzes the factors related to improving the efficiency of the programmed heat supply mode. Modeling of the operating modes for heat supply system operated in intermittent heating mode is carried out. There was performed the mathematical modeling of the heating system operation modes for the most unfavorable climatic conditions at low outdoor temperatures, with respective system efficiency indicators obtaining. The potential of energy saving level for administrative, educational, and office buildings depending on the thickness of thermal insulation of external and internal walls is studied. Recommendations have been elaborated for the use of buildings thermal insulation to improve the efficiency of intermittent heating.

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Influence of Heat Accumulation of the Object on the Operation of the Cooled Ceilings Cooling System

Cited by 3 publications

References 7 publications

Techniques for Enhancing Thermal Conductivity and Heat Transfer in Phase Change Materials in Hybrid Phase Change Material–Water Storage Tanks

Techniques for Enhancing Thermal Conductivity and Heat Transfer in Phase Change Materials in Hybrid Phase Change Material–Water Storage Tanks

Experimental Devices for Measuring Small Gas Flows

Influence of the Building’s Thermal Insulation on Intermittent Heating Mode Efficiency

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