Impact of the heat-humidity regime of warm attics on the condition of enclosing structures

Datciuk, T. A.; Anshukova, E. A.

doi:10.23968/1999-5571-2019-16-5-160-165

Cited by 2 publications

(2 citation statements)

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“…In [8] the provisions of the theory of heat stability [9,10,11] are considered with respect to the values of the stabilizing convective flow for smoothing the harmonically changing radiant flux. It is shown that the assimilating convective flow will be less if the heat absorption index of the room is bigger.…”

Section: Introductionmentioning

confidence: 99%

“…It is shown that the assimilating convective flow will be less if the heat absorption index of the room is bigger. At the same time, according to the theory of heat stability, the value of the required radiant heat fluxes, which change over time and assimilate convective heat gains, will be the greater the greater the heat stability [10,11].…”

Section: Introductionmentioning

confidence: 99%

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Calculating the load on the room cooling ceiling panel at convective heat gains

Malyavina

Lomakin

2020

E3S Web Conf.

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A well-known statement of the theory of thermal stability asserts that when a harmonically time-changing convective heat flux enters a room, it can only be assimilated by a radiant cooling system if the assimilating flow exceeds the perturbing convective flow in magnitude. However, in engineering practice, there are no purely radiant systems. Therefore, the article has considered a ceiling cooling panel as a room cooling system, the heat flow from which is of a radiant-convective nature. The convective heat access to the room is constant during the working hours from 9 a.m. to 6 p.m. The task of determining the load on the cooling system has been performed by calculations.. Herewith, the rooms of different internal thermal stability have been considered. According to the calculation results, it has been found that, since the amount of the heat gains remains constant for a long period of time, the process of the room cooling comes almost to a stationary state and does not depend on the room thermal stability with assimilated heat gains, the value of which in different options varied from 100 W to 1000 W. It has been found, that when the temperature difference between the panel surface and the surrounding surfaces increases, the proportion of the convective assimilating flow becomes bigger.

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Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Calculating the load on the room cooling ceiling panel at convective heat gains

Malyavina

Lomakin

2020

E3S Web Conf.

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Mathematical modeling of the unsteady moisture condition of enclosures with application of the discrete-continuous approach

Геннадьевич

Павлович²

2020

Vestnik MGSU

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Introduction. The paper considers mathematical models developed by K.F. Fokin, A.V. Lykov, V.I. Lukyanov, V.N. Bogoslovskiy, and H.M. Künzel and shows the advantages of using the moisture potential as compared with separate consideration of the transfer potentials. An analytical expression for the moisture potential F developed by V.G. Gagarin and V.V. Kozlov is given. Materials and methods. The article formulated a differential moisture transfer equation with time-constant coefficients and and described boundary conditions. An analytical expression determining the moisture potential using the discrete-continuous approach was obtained. Results. The article compares some calculation methods on the theory of moisture potential F for the single-layer aerated concrete enclosure, the two-layer brick wall, as well as two composite facade heat-insulation systems with external plaster layers with heat-insulation of mineral wool and foamed polystyrene. The solution of the unsteady equation of moisture transfer by the finite difference method using an explicit difference scheme and by the discrete-continuous method, the solution of the stationary equation of moisture transfer are considered. Conclusions. The moisture distribution obtained using the discrete-continuous approach, both quantitatively and qualitatively, coincides with the moisture distribution by the finite difference method. However, this distribution is obtained by the final formula without using the numerical method, which simplifies the calculation. The scientific novelty of the research consists in the development of a mathematical model based on the moisture potential F as well as in solving the equation of the unsteady moisture transfer through the discrete-continuous approach. The possibility of obtaining moisture distribution over the thickness of the enclosure according to the obtained formula is the practical relevance of the research.

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Impact of the heat-humidity regime of warm attics on the condition of enclosing structures

Cited by 2 publications

References 0 publications

Calculating the load on the room cooling ceiling panel at convective heat gains

Calculating the load on the room cooling ceiling panel at convective heat gains

Mathematical modeling of the unsteady moisture condition of enclosures with application of the discrete-continuous approach

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