Mathematical Model of the Thermal-Air Regime of a Ventilated Attic

Piotrowski, Jerzy Zbigniew; Stroy, A.; Olenets, M.

doi:10.3846/13923730.2014.893914

Cited by 13 publications

(8 citation statements)

References 9 publications

(9 reference statements)

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“…Autoclaved sand-lime bricks are very popular in Poland, Germany, Spain, Slovakia, and other countries in Europe. These types of materials, commonly called "silicates products", are construction materials providing a solid structure and comfortable interior microclimate [9,10]. Modifications of sand-lime bricks aim at optimizing the production process and replacing the quartz sand with another component.…”

Section: Introductionmentioning

confidence: 99%

A Sustainable Autoclaved Material Made of Glass Sand

2019

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Far-reaching technological progress, manufacturing, and rapidly advancing globalization dictate new conditions for the development and changes in the construction industry. Valorization of by-products and the use of secondary materials in the production of building materials have attracted a lot of attention. Silicate materials were assessed on the basis of their compressive property. An orthogonal compositional plan type 3k (with k = 2), that is, a full two-factor experiment was applied in order to carry out the compressive strength and bulk density tests. Glass sand was added to the silicate mass as a modification. The results show that the compressive strength was higher than that of traditional bricks. Scanning electron microscopy coupled with energy dispersive spectrometry SEM/EDS was used to study the microstructure, whereas the XRD analysis was applied to examine the structures. Laboratory tests were performed on samples with dimensions of 50 × 50 × 50 mm. The results show the bulk density increase to the value of 1.75 kg/dm3, which increases the acoustic performance of the new products. The results of the modifications also indicate changes in the structure of the new bricks. The reference sample contained α-quartz, zeolite, tobermorite 9A, and calcium aluminum silicate (Ca2Al4Si12O32), whereas the samples modified with glass sand, the presence of phases such as α-cristobalite, natrolite, tobermorite 11A, gyrolite, and analcite was recorded.

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Section: Introductionmentioning

confidence: 99%

A Sustainable Autoclaved Material Made of Glass Sand

2019

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“…The air supply is also brought by the leaks in the housing building. The amount of air flowing in this way is influenced by the wind (its direction and speed) that issue is differently undertaken in the literature by the authors (Piotrowski et al 2015;Zender-Świercz and Piotrowski 2011). However, due to the building high tightness the study focuses on the air inflow through individual air supply systems.…”

Section: Subject Of the Studymentioning

confidence: 99%

Improving the indoor air quality using the individual air supply system

Zender–Świercz

2017

Int. J. Environ. Sci. Technol.

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Indoor air quality attracts great interest. Many dwellings are ventilated naturally. The article presents the gravity system conversion into individual air supply system, which can be equipped with air fan. This solution's impact on the interior microclimate was analyzed. The proposed solution uses the lower natural ventilation ducts sections, which are not normally used as air supply channels to bring air to the housing. Exhaust grilles were located in the adjacent rooms. Individual air supply system with switched off fan improves indoor air quality insufficiently; however, switching on the device causes a very significant change. A large carbon dioxide concentration reduction (which was used as an air quality indicator) has been confirmed by rigorous statistical analysis, the results of which were presented in the article.

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“…To describe the thermal conductivity in the liquid surrounding the bubble with radius R, let us divide the liquid layer into a series of concentric membranes (i), Figure 1. Let us set the mass distribution of each membrane: (2) (1) …”

Section: A Mathematical Model Of Phase Transition Processes In the LImentioning

confidence: 99%

“…As an example, we should mention the following technologies: degassing of water, distillation homogenization of fuel, mixing of colloidal solutions, foam formation in the food industry, etc. Modern technologies for the insulating materials production [1], desalination of sea water with the help of isobutane hydrate [2][3][4], and obtaining of natural gas hydrate [5,6] for transportation and storage are also based on heat and mass transfer processes in the gas-liquid systems. Generally, formation and existence of gas-to-steam bubbles are accompanied by intensive heat transfer, mass transfer and phase transition processes.…”

Section: Introductionmentioning

confidence: 99%

Peculiarities of Phase Processes in the Volume of Liquid

Pavlenko

Koshlak

2018

SAE

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methods. Mathematical models allow identifying the most powerful factors and optimizing technological processes. Correctness of the mathematical models of gas-to-steam bubbles is determined by the accuracy of accounting all thermal and physical processes taking place in the liquid and gas. Literature review and problem statementTo improve the accuracy of simulating heat transfer processes in the gas-to-steam bubble, it is necessary to consider the heat transfer into the liquid medium. A number of authors take the liquid temperature to be constant: when calculating the materials swelling [1], when determining the thermodynamic characteristics of steam [7] and cavitation bubbles [8]. In [9], the liquid temperature is described by the exponential function that does not depend on time and the direction of the bubble wall's movement. A b s t r a c t The work is devoted to the study of the transient processes of heat and mass transfer in the volume of a liquid. The method of calculating the temperature field in a liquid takes into account phase transitions, motion of the bubble wall and heat exchange processes near its surface. The method takes into account the change in the thermophysical characteristics of a liquid when its temperature changes. The results of the research can be used to optimize the various technological processes associated with cavitation, boiling and the formation of gas hydrates.Keywords: thermophysical characteristics of a gas-saturated liquid, gas-vapor bubble, heat transfer in two-phase media, phase transitions S t r e s z c z e n i e Słowa kluczowe: właściwości termofizyczne cieczy nasyconej gazem, pęcherzyki gazu i pary, wymiana ciepła w mediach dwufazowych, przemiany fazowe

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Mathematical Model of the Thermal-Air Regime of a Ventilated Attic

Cited by 13 publications

References 9 publications

A Sustainable Autoclaved Material Made of Glass Sand

A Sustainable Autoclaved Material Made of Glass Sand

Improving the indoor air quality using the individual air supply system

Peculiarities of Phase Processes in the Volume of Liquid

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