ASSESSMENT OF THE INFLUENCE OF THE METHODS OF BALANCE OF THE HEATING SYSTEM ON THE THERMAL REGIME AND HEAT ENERGY ECONOMY OF THE BUILDING OF THE HIGHER EDUCATION INSTITUTION

Abstract

When comparing the efficiency of balancing single-pipe heating systems of a building and assessing its impact on the saving of thermal energy by the building of a higher education institution (HEI), a model of the thermal regime of the building was compiled and characterized as a single thermal energy system taking into account its three subsystems: a model of the thermal energy effect of the external climate on the building (η1), models of the thermal energy influence of the thermal inertia of the building envelope (η2) and models of the thermal energy influence of the engineering systems of the building (η3). In order to assess the availability of specified indicators, based on heat energy impact models, the availability coefficient Kz(PD) (project deviation) is introduced, which shows (in fractions of a unit) the deviation of the mentioned indicators from the calculated conditions and characterizes the degree of difference between the implemented solution and the optimal one and is an indicator of heat energy efficiency project solution as a whole. The savings of thermal energy obtained when using different options of automatic balancing are presented - for a single-pipe system with a constant hydraulic mode and separately for a single-pipe heating system with a variable hydraulic mode. It was established that with an increase in the value of the internal heat capacity of the building, the decrease in the specific energy consumption of the HEI building becomes less noticeable, compared to less massive buildings (light and very light structures). Thus, for buildings with an indicator of the internal heat capacity of the building С = 110 W · h/(m2 · K), the specific rate of reduction in energy consumption by the HEI building is 0.8 thousand kWh/m², while for buildings with an indicator of the internal heat capacity of the building C = 80 W · h/(m2 · K) and C = 25 W · h/(m2 · K) - the specific reduction in energy consumption by the building was 1.0 thousand kWh/m² and 1.1 thousand kWh h./m² per year, respectively. It is shown that the level of energy savings after balancing the heating system for a building of very light construction (index of internal heat capacity of the building С = 25 W · h/(m2 · K)) was 2 %, for buildings of heavy and very heavy constructions (index of internal heat capacity of the building C = 80 W · h/(m2 · K) and C = 110 W · h/(m2 · K) respectively) – 2.2 %.