Boundary Conditions for Calculating Temperature Fields of Window Junction Nodes in the Window Sill Area

Number of journal: 11-2022
Autors:

Krutov A.A.,
Konstantinov A.P.

DOI: https://doi.org/10.31659/0044-4472-2022-11-11-18
УДК: 692.82

 

AbstractAbout AuthorsReferences
The current requirements of regulatory documentation in the Russian Federation prescribe to perform numerical modeling of temperature fields of window junction nodes at uniform values of the heat transfer coefficient on all their internal surfaces. This approach does not reflect the real conditions of heat exchange near windows in winter. Because of this, in practice, condensation forms on the inner surfaces of windows in winter. In this paper, we have carried out the justification of the boundary conditions of heat exchange in the most unfavorable part of the window from the point of view of condensation formation – the area of the window’s abutment to the window sill. To do this, we have analyzed the current regulatory documentation and scientific research related to this issue. We performed laboratory studies of heat transfer near the inner surface of the window. Based on these studies, we have obtained refined values of local heat transfer coefficients for the inner surfaces of the lower part of the window. We compared the results of numerical simulation of window junction nodes under standard and refined boundary conditions. It showed that the use of standard boundary conditions leads to excessive temperatures on the inner surfaces of windows in comparison with laboratory data. This is especially noticeable in areas of the window with air stagnation (window frame, edge zone of the double-glazed window). The calculation of temperature fields performed using refined boundary conditions at the window frame and in the edge zone of the double-glazed window gives comparable results with the data of numerical studies. At the same time, the temperature difference of the window surfaces according to the results of calculation and testing does not exceed the measurement error of temperature sensors.
A.A. KRUTOV, Master’s degree (postgraduate student) (This email address is being protected from spambots. You need JavaScript enabled to view it.),
A.P. KONSTANTINOV, Candidate of Sciences (Engineering) (This email address is being protected from spambots. You need JavaScript enabled to view it.)

National Research Moscow State University of Civil Engineering (26, Yaroslavskoe Highway, Moscow,129337, Russian Federation)

1. Umnyakova N.P., Butovsky I.N., Verkhovsky A.A., Chebotarev A.G. Requirements to heat protection of external enclosing structures of high-rise buildings. Zhilishchnoe Stroitel’stvo [Housing Construction]. 2016. No. 12, pp. 7–11. (In Russian).
2. Zimin A.N., Bochkov I.V., Kryshov S.I., Umnyakova N.P. Heat transfer resistance and temperature on internal surfaces of translucent enclosing structures of residential buildings of Moscow. Zhilishchnoe Stroitel’stvo [Housing Construction]. 2019. No. 6, pp. 24–29. (In Russian). DOI: https://doi.org/10.31659/0044-4472-2019-6-24-29
3. Verkhovskiy A., Bryzgalin V., Lyubakova E. Thermal deformation of window for climatic conditions of Russia. IOP Conf. Series: Materials Science and Engineering. 2018. Vol. 463. 032048. doi:10.1088/1757-899X/463/3/032048
4. Savin V.K. Stroitel’naya fizika: energoperenos, energoeffektivnost’, energosberezhenie [Construction physics: energy transfer, energy efficiency, energy saving]. Moscow: Lazur’. 2005. 432 p.
5. Kozlov V.V. Accuracy of calculation of the resistant resistance of heat transfer and temperature fields. Stroitelstvo i Reconstructciya. 2018. No. 3, pp. 62–74. (In Russian).
6. Konstantinov A.P., Krutov A.A., Tikhomirov A.M. Assessment of the PVC windows thermal characteristics in winter. Stroitel’nye Materialy [Construction Materials]. 2019. No. 8, pp. 65–72. (In Russian). DOI: https://doi.org/10.31659/0585-430X-2019-773-8-65-72
7. Boriskina I.V. Zdaniya i sooruzheniya so svetoprozrachnymi fasadami i krovlyami. Teoreticheskie osnovy proektirovaniya svetoprozrachnyh konstrukcij [Buildings and structures with translucent facades and roofs. theoretical bases of designing of glass constructions]. Sankt-Peterburg: Lyubavich. 2012. 396 p.
8. Plotnikov A.A. Arhitektura mnogoetazhnyh zhilyh zdanij [Architecture of multi-storey residential buildings]. Moscow: MGSU. 2018. 341 p.
9. Bockh P. Heat Transfer. Basics and Practice. London-New York: Springer Heidelberg Dordrecht, 2012. 291 p.
10. Mokheimer E.M.A. Heat transfer from extended surfaces subject to variable heat transfer coefficient. Heat and Mass Transfer. 2003, pp. 131–138.
11. Elmahdy A.H., Frank T. Heat transfer at the edge of sealed insulating glass units: Comparison of hot box measurements with finite-difference modeling. ASHRAE Transactions. 1993. No. 99, pp. 915–922.
12. Curcija D. Effect of Realistic Boundary Conditions in Computer Modeling of Condensation Resistanse for Fenestration Systems. Thermal Envelopes. No. 7, pp. 405–414.
13. McGowan A.G. Computer simulation of window condensation potential. Thermal Envelopes. No. 7, pp. 229–235.
14. Wright J.L. A Simplified numerical method for assessing the condensation resistance of windows. ASHRAE Transactions. 1998. No. 1. Pt. 1, pp. 1–8.
15. Yazdanian M. Measurement of the exterior convective film coefficient for windows in low-rise buildings. ASHRAE Transactions. 1994. No. 100.
16. Drozdov V.A. Teploobmen v svetoprozrachnyh ograzhdayushchih konstrukciyah [Heat exchange in translucent enclosing structures]. Moscow: Strojizdat, 1979. 307 p.
17. Bogoslovskij V.N. Stroitel’naja teplofizika (teplofizicheskie osnovy otoplenija, ventiljacii i kondicionirovanija vozduha) [Construction thermophysics (thermophysical fundamentals of heating, ventilation and air conditioning)]. Saint-Petersburg: AVOK Severo-zapad. 2006. 400 p.
18. Hua Ge. Study on overall thermal performance of metal curtain walls. Hua Ge – Concordia University, Monreal. 2002. 326 p.
19. Griffith B.T. Experimental techniques for measuring temperature and velocity fields to improve the use and validation of building heat transfer models. Thermal Envelopes. No. 7, pp. 337–347.

For citation: Krutov A.A., Konstantinov A.P. Boundary conditions for calculating temperature fields of window junction nodes in the window sill area. Zhilishchnoe Stroitel’stvo [Housing Construction]. 2022. No. 11, pp. 11–18. (In Russian). DOI: https://doi.org/10.31659/0044-4472-2022-11-11-18


Print   Email