Analysis of Heat Gain and Heat Loss Through Low-E Glazing in Chinese Cities

Currently, research aimed at energy conservation is becoming increasingly important in the construction industry. A number of works of the authors investigate the use of glazing with low-emission coatings that promote energy saving in various climatic conditions of Russia. However, it is interesting to extend these studies to other geographical latitudes and warmer climates. In this paper, the calculation of heat gain and heat loss through glazing with low-emission coatings for Chinese cities is considered. A condition is presented under which the replacement of double-glazed windows with energy-saving ones does not lead to heat losses greater than the reduction in heat gain from solar radiation. At the same time, data on solar radiation entering the facades of the four main orientations in Chinese cities during the heating period and then passing through the glazing into the room were used, and transmission heat losses through the glazing were calculated. A comparison of heat gains and heat losses is made and it is shown that in the cities of China under consideration, heat gains exceed heat losses not only for the southern orientation, but also for other orientations, therefore, it is necessary to check the conditions for the expediency of replacement for all orientations. The calculation is carried out for the fulfillment of the presented condition of the four main orientations and it is shown that for some cities in China it is impractical to replace the glazing with energy-saving ones with sun protection functions for one of the orientations, and for other orientations it is expedient. In this regard, in Chinese cities, it is proposed to calculate for all possible orientations of the building facades, and then, if the joint condition is met, consider the replacement appropriate.

ZHIBO ZHOU^1,2, Candidate of Sciences (Engineering) (This email address is being protected from spambots. You need JavaScript enabled to view it.);
E.V. KORKINA^3,4, Candidate of Sciences (Engineering) (This email address is being protected from spambots. You need JavaScript enabled to view it.);
CHENG SUN^1,2, Doctor of Sciences (Engineering);
М.D. TYULENEV⁴, postgraduate

¹ Harbin Institute of Technology (92, Xidazhi Street, Harbin, 150001, China)
² Key Laboratory of Cold Region Urban and Rural Human Settlement Environment Science and Technology (Harbin Institute of Technology), Ministry of Industry and Information Technology (92, Xidazhi Street, Harbin, 150001, China)
³ Research Institute of Building Physics. Russian Academy of Architecture and Construction Sciences (21, Lokomotivny proezd, Moscow, 127238, Russian Federation)
⁴ Moscow State University of Civil Engineering (MGSU) (26, Yaroslavskoye shosse, Moscow, 129337, Russian Federation)

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