Search results for: Łukasz J. Orman

Items from 1 to 7 out of 7 results

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Case study of thermal comfort, lighting conditions and productivity at two classrooms of Poznań University of Technology

Łukasz J. Orman, Janusz Wojtkowiak

Structure and Environment > 2022 > Vol. 14, no. 2 > 39--43

The paper analyses subjective sensations of thermal comfort, lighting conditions and self-reported productivity of 51 students of Poznań Univeristy of Technology (Poland). The study took place in the spring and was based on the use of anonymous questionnaires with questions on thermal sensations, acceptability and preferences as well as the students’ assessment of their current productivity and lighting...

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Questionnaire survey of thermal sensations in the large lecture room

Grzegorz Majewski, Marek Telejko, Natalia Krawczyk, Luiza Dębska, more

Structure and Environment > 2021 > Vol. 13, no. 4 > 113--117

The article focuses on the subjective assessment of human thermal sensations expressed by them in the questionnaires. The tests were performed in the lecture room of Kielce University of Technology, where 69 students answered the questions about their thermal sensations. The results show that the majority of students felt satisfied and were not interested in changing the conditions. The impact of...

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Discussion of the heat flux calculation method during pool boiling on meshed heaters

Łukasz J. Orman, Norbert Radek, Jacek Pietraszek, Dariusz Gontarski

System Safety : Human - Technical Facility - Environment > 2020 > Vol. 2, nr 1 > 247--252

The paper discusses nucleate boiling heat transfer on meshed surfaces during pool boiling of distilled water and ethyl alcohol of very high purity. It presents a correlation for heat flux developed for heaters covered with microstructural coatings made of meshes. The experimental results have been compared with the calculation results performed using the correlation and have been followed by discussion...

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Pool Boiling Heat Transfer from Rough and Microstructure Coated Surfaces

Łukasz J. Orman, Katarzyna Orman, Iwona Wojton

Rocznik Ochrona Środowiska > 2020 > Tom 22, cz. 1 > 514--525

The paper presents the test results of pool boiling heat transfer on the rough surface and the surface covered with capillary – porous microstructure. The porous layer is made of copper fibers sintered in the reduction atmosphere. The volumetric porosity amounted to 68%, while its height 1 mm. Distilled water and ethyl alcohol were used as the working fluids. The experiments have been carried out...

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Composite Heat Exchangers for Boiling Heat Transfer Enhancement

Lidia Dąbek, Łukasz J. Orman

Rocznik Ochrona Środowiska > 2020 > Tom 22, cz. 2 > 905--914

The paper deals with the development of high-performance composite heat exchangers made of different metals. The samples made of meshes and fine fibers have been sintered to the copper base in the reduction atmosphere to prevent oxidation. The test of boiling heat transfer performance have been carried out under ambient pressure with distilled water and ethyl alcohol as working agents. The obtained...

article

Phase change heat exchangers made of pin-fins for boiling enhancement

Łukasz J. Orman, Norbert Radek, Jacek Pietraszek, Dariusz Gontarski

Quality Production Improvement - QPI > 2019 > Vol. 1, Iss. 1 > 433--439

The paper deals with the important issue of boiling heat transfer enhancement using mechanical treatment of the heater surface. The surface has been modified in such a way that microfins have been produced. The application of such a structure leads to highly increased heat fluxes in relation to the smooth surface as has been presented and discussed in the paper. The experiments including distilled...

article

Boiling Heat Transfer Phenomenon on Different Structural Coatings

Łukasz J. Orman, Andrej Kapjor, Martin Vantúch

Procedia Engineering > 2017 > 192 > C > 649-653

The paper discusses the use of different structural coatings for pool boiling heat transfer. There are a few most common types of such coverings such as meshes, sintered powders and fibers, however, they generally enhance boiling in relation to the smooth surface. The article focuses on wire mesh microstructures due to their advantages for practical use in the design of phase – change heat exchangers.

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INFONA - science communication portal

Search results for: Łukasz J. Orman

Case study of thermal comfort, lighting conditions and productivity at two classrooms of Poznań University of Technology

Questionnaire survey of thermal sensations in the large lecture room

Discussion of the heat flux calculation method during pool boiling on meshed heaters

Pool Boiling Heat Transfer from Rough and Microstructure Coated Surfaces

Composite Heat Exchangers for Boiling Heat Transfer Enhancement

Phase change heat exchangers made of pin-fins for boiling enhancement

Boiling Heat Transfer Phenomenon on Different Structural Coatings

Filter options

Publication date

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INFONA - science communication portal

Search results for: Łukasz J. Orman

Case study of thermal comfort, lighting conditions and productivity at two classrooms of Poznań University of Technology

Questionnaire survey of thermal sensations in the large lecture room

Discussion of the heat flux calculation method during pool boiling on meshed heaters

Pool Boiling Heat Transfer from Rough and Microstructure Coated Surfaces

Composite Heat Exchangers for Boiling Heat Transfer Enhancement

Phase change heat exchangers made of pin-fins for boiling enhancement

Boiling Heat Transfer Phenomenon on Different Structural Coatings

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