Checking the Feasibility of Reducing the Power of a School Classroom Heating System

The article considers the classrooms of a secondary school where the power of the heating system is reduced during non-working hours. The geometric parameters of the classrooms and the heat transfer resistance of external enclosing structures are the same. The classrooms have a different internal thermal stability. For each classroom, a non-stationary heat regime has been calculated for design outdoor heating conditions of Moscow. The solution was carried out using the finite difference method. As a result of calculations, it was found that even if there is no room heating before the start of the working day, when the heating is reduced to 60, 70, 80% of the 24-hour operating system power, the air temperature and the resulting room temperature correspond to the optimal temperature range during the working hours. However, since the temperature of the internal surfaces of external enclosing structures did not have time to go up, the local asymmetry of the resulting temperature at the border of the serviced zone is higher than not only the optimal one, but also the permissible value of 3.5^oC.

E.G. MALYAVINA¹, Candidate of Science (Engineering) (This email address is being protected from spambots. You need JavaScript enabled to view it.),
R.T. SHAKHMALIYEV¹, student;
Yu.N. LEVINA², Engineer

¹ National Research Moscow State University of Civil Engineering (26, Yaroslavskoe Highway, Moscow, 129337, Russian Federation)
² Research Institute of Building Physics of the Russian Academy of Architecture and Construction Sciences (21, Lokomotivniy Driveway, Moscow, 127238, Russian Federation)

1. Anisimova E. Yu. Energy efficiency of temperature conditions for a building at optimum intermittent central heating use. Vestnik Yuzhno-Uralskogo gosudarstvennogo Universiteta. 2012. No. 38, Iss. 15, pp. 55–59. (In Russian).
2. Balasanyan G.A., Klimchuk A.A., Minyailo M.B. Modeling of intermittent heating mode of a combined heat supply system with a heat pump. Vestnik NTU. 2015. No.17, pp. 35–42. (In Russian).
3. Kutsenko A.S., Kovalenko S.V., Tovazhnyanskiy V.I. Analysis of energy efficiency of intermittent heating mode of buildings. Polzunovskiy vestnik. 2014. No. 4, pp. 57–65. (In Russian).
4. Zakharevich A. E. Saving the thermal energy at intermittent heating. SOK. 2014. No. 1, pp. 44–60. (In Russian).
5. Panferov V. I. Efficiency of building microclimate management in non-working hours. SOK. 2014. No. 2, pp. 37–42. (In Russian).
6. Vasiliev G.P., Lichman V.A., Peskov H.V. Numerical method for optimization of intermittent heating mode. Matematicheskoye modelirovaniye. 2010. No. 11. Vol. 22, pp. 123–130. (In Russian).
7. Datsyuk T.A., Ivlev Yu.P. Energy-Efficient solutions in ventilation practice on the basis of mathematical modeling. Proceedings: Theoretical foundations of heat and gas supply and ventilation. 2009, pp. 193–196. (In Russian).
8. Datsyuk T.A., Taurit V.R. Modeling of microclimate of residential premises. Vestnik grazhdanskikh inzhenerov. 2012. No. 4, pp. 196–198. (In Russian).
9. Vytchikov Yu.S., Belyakov I.G., Saparyov M.E. Mathematical simulation of nonstationary process of heat transfer through the building cladding structures in conditions of intermittent heating. Mezhdunarodniy nauchno-issledovatelskiy zhurnal. 2016. No. 6 (48). Part 2, pp. 42–48. (In Russian). DOI: https://doi.org/10.18454/IRJ.2016.48.180
10. Kisilewicz T. Passive Control of Indoor Climate Conditions in Low Energy Buildings. Energy Procedia. 2015. Vol. 78, рр. 49–54. DOI: https://doi.org/10.1016/j.egypro.2015.11.113
11. La Gennusa М., Lascari G., Rizzo G., Scaccianoce G. Conflicting needs of the thermal indoor environment of museums: In search of a practical compromise. Journal of Cultural Heritage. 2008. Iss. 2. Vol. 9, pp. 125–134, DOI: https://doi.org/10.1016/j.culher.2007.08.003
12. Pingel M., Vardhan V., Manu S., Brager G., Rawal R., A study of indoor thermal parameters for naturally ventilated occupied buildings in the warm-humid climate of southern India. Building and Environment. 2019. Vol. 151, pp. 1–14. DOI: https://doi.org/10.1016/j.buildenv.2019.01.026.
13. Wei Tian, Xu Han, Wangda Zuo, Michael D. Sohn. Building energy simulation coupled with CFD for indoor environment: A critical review and recent applications. Energy and Buildings. 2018. Vol. 165, pp. 184–199, DOI: https://doi.org/10.1016/j.enbuild.2018.01.046
14. Giancola E., Soutullo S., Olmedo R., Heras M.R. Evaluating rehabilitation of the social housing envelope: Experimental assessment of thermal indoor improvements during actual operating conditions in dry hot climate, a case study. Energy and Buildings. 2014. Vol. 75, pp. 264–271. DOI: https://doi.org/10.1016/j.enbuild.2014.02.010
15. Malyavina E.G., Agakhanova K.M., Umnyakova N.P. Configuration of a natural exhaust ventilation system with standard air rates. Zhilishchnoe Stroitel’stvo [Housing Construction]. 2020. No. 6, pp. 41–47. (In Russian). DOI: https://doi.org/10.31659/0044-4472-2020-6-41-47
16. Malyavina E.G., Asatov R.R. Influence of the thermal mode of external enclosing structures on the load of the heating system during the intermittent heat supply. Academia. Arkhitectura i stroitel’stvo. 2010. No. 3, pp. 324–327.
17. Malyavina E., Lomakin A. Load on the air conditioning system in a room with non-round-the-clock working day in the warm season. E3S Web of Conferences Innovative Technologies in Environmental Science and Education (ITESE-2019). Vol. 135. DOI: https://doi.org/10.1051/e3sconf/201913503018
18. Malyavina E., Frolova A. Influence of Solar Radiation Heat Input into Room on Level of Еconomically-efficient Thermal Protection of Building. IOP Conference. Series: Materials Science and Engineering. 2019. DOI: https://doi.org/10.1088/1757-899X/661/1/012077