Numerical Simulation of Passive Cooling Beam and Its Optimization to Increase the Cooling Power

Kadúchová, Katarína; Lenhard, Richard

doi:10.3390/pr9081478

Cited by 4 publications

(1 citation statement)

References 16 publications

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“…The conclusions drawn by the researchers are the influence of external humidity in the preparation of the data, in the next paper on the inaccuracy of the PMV index, and in the third on the thermal differences of people in air-conditioned rooms with thermal sensations in people who do not have air conditioning in the office, becoming more susceptible to any temperature fluctuations. It needs to be remembered that thermal comfort is closely related to the issues of heat transfer [14][15][16][17][18][19][20][21] The research conducted so far does not provide any knowledge about people's thermal sensations by comparing ordinary classrooms with a climatic chamber. Therefore, the main goal of the work is to conduct research in the lecture hall and the climatic chamber with the same internal conditions, and then to compare TSV, PMV and PPD.…”

Section: Introductionmentioning

confidence: 99%

Comparison of Thermal Sensations Under the Same Conditions in the Climatic Chamber and the Lecture Hall

Dębska

Krawczyk

2022

MATEC Web Conf.

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For many people, the feeling of thermal comfort becomes an important aspect of helping to increase concentration at work or study. Creating an appropriate indoor microclimate becomes a huge challenge for many designers of modern construction. The most important assumption of the work is to compare the thermal sensations of a group of four, aged 23 to 30, staying in the lecture class of an intelligent building and in a climatic chamber with the same internal parameters. For this purpose, the Testo 400 environmental meter was used, collecting the necessary parameters from the environment, and specially created surveys describing people's thermal feelings during the study. The air temperature and relative humidity were as follows: 21.7 °C and 30.80 %, while for the climatic chamber the same data was applied, but at the end of the study both parameters increased to 21.9 °C and 40.50 %. Moreover, it turned out that people in the lecture hall felt worse than in the climatic chamber with similar internal values. In addition, the average Thermal Sensation Vote (TSV) response showed that the perceived environment is comfortable for the study group staying in the climatic chamber, as opposed to the feeling of influenza in the room. Unfortunately, the Predicted Mean Vote (PMV) for the room and chamber exceeded the set value described in the ISO 7730 standard.

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Section: Introductionmentioning

confidence: 99%

Comparison of Thermal Sensations Under the Same Conditions in the Climatic Chamber and the Lecture Hall

Dębska

Krawczyk

2022

MATEC Web Conf.

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Pool boiling heat transfer performance of the surface modified with laser

et al. 2022

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The paper deals the problem of pool boiling heat transfer on the surface produced by the modification with the laser beam. The laser enabled to produce grooves and roughness which have a positive impact on heat transfer. The distilled water and ethanol boiling performance of a horizontally located specimen is discussed and the test results are compared with the model of boiling heat transfer selected from the literature. The laser technique proved to be a valuable tool for producing surfaces that improve thermal performance during pool boiling.

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Passive Night Cooling Potential in Office Buildings in Continental and Mediterranean Climate Zone in Croatia

2022

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The envelope is one of the most important driving factors in the energy efficiency of buildings. Typical for office and commercial buildings, curtain wall facades allow solar heat gains to be used during the winter but can lead to difficulties in reducing the cooling load during summer. The cooling load is dominant in most building types in the temperate maritime climate, while in the temperate continental climate, it is dominant mainly in office and commercial buildings. The goal of this research was to determine the potential of night passive cooling in an office building model in the most populated urban areas in Croatia-Zagreb and Split, which are located in two different climate zones. Suitable to the climate on-site, an appropriate building envelope and various types of passive and mechanical ventilation systems were selected for each location and case. Additional factors included and analysed were climate conditions, heat gains, the heat accumulation of the building, night ventilation through openings, unwanted air infiltration, and cooling loads. Through a detailed description of the model, passive cooling potential calculations, and Computer Fluid Dynamics (CFD) simulations, the results showed a potential of up to 43.5% savings in the cooling energy need for the temperate continental climate and 32.2% in the temperate marine climate. It was found from the analysis that night ventilation is expected to cool down the building enough to delay a need for cooling by several hours and improve fresh air requirements, thus saving power for cooling, and effectively reducing the need for air conditioning.

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Numerical Simulation of Passive Cooling Beam and Its Optimization to Increase the Cooling Power

Cited by 4 publications

References 16 publications

Comparison of Thermal Sensations Under the Same Conditions in the Climatic Chamber and the Lecture Hall

Comparison of Thermal Sensations Under the Same Conditions in the Climatic Chamber and the Lecture Hall

Pool boiling heat transfer performance of the surface modified with laser

Passive Night Cooling Potential in Office Buildings in Continental and Mediterranean Climate Zone in Croatia

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