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Krzysztof Nering
Faculty of Civil Engineering, Cracow University of Technology, 31-155 Cracow, Poland

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Journal article
Published: 02 July 2021 in Energies
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Airflow occurring in a ventilation duct is characterized by low velocity and hence low Reynolds number. In these conditions, either a laminar, transitional or turbulent flow will occur. Different flow conditions result in different values of the friction coefficient. To achieve the transitional flow in numerical simulation, a modified algebraic model for bypass transition (modified kω) was used. Numerical simulation was validated using Particle Tracking Velocimetry (PTV) in the circular channel. The modified algebraic model consists of only two partial differential equations, which leads to much faster calculation than the shear stress transport model. Results of the modified algebraic model are largely consistent with either the measurement and shear stress transport model considering laminar and transitional flow. Consistency slightly decreased in turbulent flow in relation to the model using shear stress transport method.

ACS Style

Konrad Nering; Krzysztof Nering. Validation of Modified Algebraic Model during Transitional Flow in HVAC Duct. Energies 2021, 14, 3975 .

AMA Style

Konrad Nering, Krzysztof Nering. Validation of Modified Algebraic Model during Transitional Flow in HVAC Duct. Energies. 2021; 14 (13):3975.

Chicago/Turabian Style

Konrad Nering; Krzysztof Nering. 2021. "Validation of Modified Algebraic Model during Transitional Flow in HVAC Duct." Energies 14, no. 13: 3975.

Conference paper
Published: 10 December 2020 in IOP Conference Series: Materials Science and Engineering
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Structure-borne noise is an extremely complex issue considering comfort of room users. The purpose of this work is to focus on the impact of vibration on humans in building together with the structure-borne noise generated by vibrating partitions of the room. Radiation of noise from vibrating partitions creates structure-borne noise, which is an additional stimulus, in addition to mechanical vibration of the floor. This means it may result in reduced comfort. Based on the review of current knowledge, it can be concluded that the perception of two simultaneous stimuli causes more annoyance than considering stimuli separately. Considering the fact that vibrations and structure-borne noise, due to the mechanics of the phenomenon, usually occur together, it is necessary to analyse the existing comfort assessment criteria. In addition, validity of given existing criteria has to be verified in the light of the phenomenon of structure-borne noise. This task was carried out using models with different approaches to the phenomenon. Basing on the given values of accelerations or velocities of floor two models were created. First model consists of single vibrating plate, with known vibration velocity. Vibrating plate radiates sound inside the modelled room. Sound pressure level was estimated using simple theoretical formulas present in literature. Second model is prepared as 3D FEM model with shell elements surrounding the room. Air was modelled inside room with 3D elements. Sound pressure level was calculated from simulations. The work aimed at determining the legitimacy of the assumption in the Polish standard PN-B-02171:2017 of mechanical vibration perception threshold and the admissible values determining mechanical vibrations.

ACS Style

Krzysztof Nering. Perception of Structure-Borne Sound in Buildings in Context of Vibration Comfort of Human in the Buildings. IOP Conference Series: Materials Science and Engineering 2020, 960, 022033 .

AMA Style

Krzysztof Nering. Perception of Structure-Borne Sound in Buildings in Context of Vibration Comfort of Human in the Buildings. IOP Conference Series: Materials Science and Engineering. 2020; 960 (2):022033.

Chicago/Turabian Style

Krzysztof Nering. 2020. "Perception of Structure-Borne Sound in Buildings in Context of Vibration Comfort of Human in the Buildings." IOP Conference Series: Materials Science and Engineering 960, no. 2: 022033.

Journal article
Published: 26 November 2020 in Sustainability
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This paper presents the issues of assessing the comfort of people staying indoors who are exposed to vibrations and material noise caused by vibrations of partitions like floors and walls (ground-borne noise). Current criteria in the evaluation of vibrational and acoustic comfort cannot be assessed in the context of the simultaneous occurrence of stimuli such as noise and vibration. Railway transport, including passenger and cargo transport, is becoming increasingly prevalent, and new railway lines are being planned for environmental reasons. Sometimes, there are changes in stimuli produced by existing railway lines. For example, high-speed trains appear on an old railway track. Such a situation appeared on the Central Railway Line in Poland, which is still used by old trains, yet its operator plans to raise their speed limits. The analysis of the problem of the simultaneous occurrence of stimuli presented in this paper was based on measurements performed in a residential building located near the Central Railway Main Line in the city Zawiercie. Noise and vibration as the analyzed stimuli in both cases meet comfort requirements, yet when exposure to two stimuli was considered, comfort may be at risk.

ACS Style

Krzysztof Nering; Alicja Kowalska-Koczwara; Krzysztof Stypuła. Annoyance Based Vibro-Acoustic Comfort Evaluation of as Summation of Stimuli Annoyance in the Context of Human Exposure to Noise and Vibration in Buildings. Sustainability 2020, 12, 9876 .

AMA Style

Krzysztof Nering, Alicja Kowalska-Koczwara, Krzysztof Stypuła. Annoyance Based Vibro-Acoustic Comfort Evaluation of as Summation of Stimuli Annoyance in the Context of Human Exposure to Noise and Vibration in Buildings. Sustainability. 2020; 12 (23):9876.

Chicago/Turabian Style

Krzysztof Nering; Alicja Kowalska-Koczwara; Krzysztof Stypuła. 2020. "Annoyance Based Vibro-Acoustic Comfort Evaluation of as Summation of Stimuli Annoyance in the Context of Human Exposure to Noise and Vibration in Buildings." Sustainability 12, no. 23: 9876.

Journal article
Published: 19 February 2019 in Sustainability
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In this article, the authors propose ways to evaluate the criteria for the considered variants of utility functions in the adaptation of historic regional architecture. The proposed set of assessment criteria (thermo-modernisation criteria, comfort of use, financial considerations, criteria of social benefits, and protection of cultural heritage) emphasises the multidimensional character of the problem of choosing a new function for a historic building. Some of the criteria are measurable while others are difficult to measure, which requires an expert approach to their assessment. The evaluation of the criteria was performed on the example of the historic building ‘Stara Polana’ located in Zakopane. The benchmark for the analysis was the existing condition of the ‘Stara Polana’ building, which is used as a hostel. The authors conducted a series of interdisciplinary studies specifying the potential of the new utility functions considered for the object in the context of the proposed criteria. The evaluation of individual criteria developed in this article is based on the multi-criteria analysis to be performed in the future and support the selection of a new function for the building in question.

ACS Style

Małgorzata Fedorczak-Cisak; Alicja Kowalska-Koczwara; Krzysztof Nering; Filip Pachla; Elżbieta Radziszewska-Zielina; Grzegorz Śladowski; Tadeusz Tatara; Bartłomiej Ziarko. Evaluation of the Criteria for Selecting Proposed Variants of Utility Functions in the Adaptation of Historic Regional Architecture. Sustainability 2019, 11, 1094 .

AMA Style

Małgorzata Fedorczak-Cisak, Alicja Kowalska-Koczwara, Krzysztof Nering, Filip Pachla, Elżbieta Radziszewska-Zielina, Grzegorz Śladowski, Tadeusz Tatara, Bartłomiej Ziarko. Evaluation of the Criteria for Selecting Proposed Variants of Utility Functions in the Adaptation of Historic Regional Architecture. Sustainability. 2019; 11 (4):1094.

Chicago/Turabian Style

Małgorzata Fedorczak-Cisak; Alicja Kowalska-Koczwara; Krzysztof Nering; Filip Pachla; Elżbieta Radziszewska-Zielina; Grzegorz Śladowski; Tadeusz Tatara; Bartłomiej Ziarko. 2019. "Evaluation of the Criteria for Selecting Proposed Variants of Utility Functions in the Adaptation of Historic Regional Architecture." Sustainability 11, no. 4: 1094.