Вестник Дагестанского государственного технического университета: Технические науки (Jul 2024)
Investigation of the indoor air temperature in a civilian building after an emergency shutdown of the heating system
Abstract
Objective. An emergency shutdown of the heating system of a civil building will inevitably lead to a violation of the thermal regime in the heated rooms. Subsequently, this incident will have a negative impact on human thermal comfort and working conditions. Thus, the issue of predicting the thermal regime of a room in the event of a termination of the supply of thermal energy, along with the search for energy-saving technologies in the construction sector, is an urgent task.Method. Software calculations are based on the classical theory of thermal stability of a room in the case of intermittent heat supply and the law of regular thermal regime of the first kind (for a heating system), the essence of which is as follows: a decrease in temperature at all points of the body during its cooling occurs in the same way, obeying an exponential law.Result. For a room in a residential building, it is established that the indoor air temperature will reach the dew point (12.5 ℃) for a period of 8 hours 42 minutes after an emergency shutdown of the heating system, and the zero value after 23 hours 42 minutes. The average value of the rate of temperature drop over a period of 50 hours is 0.72 ℃⁄h, the total loss of thermal energy was 138.2 MJ. Conclusion. Thermal accumulation of enclosing structures plays a primary role for civil buildings in maintaining the required thermal regime of the room in the event of an emergency shutdown of the heating system. With a relatively low heat capacity and high heat transfer associated with the high temperature pressure of the heating elements, the cooling of the heating system occurs quite quickly (has a high cooling rate).
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