Energy need dynamics estimation of mass-building buildings consideringthe exergetic model of heat comfort
DOI:
https://doi.org/10.31548/energiya2020.01.077Abstract
For post-Soviet countries characterized by mass-building buildings, providing comfort while minimizing energy consumption is a major challenge today. Efficient use of energy in buildings requires tools to manage consumption. Heating consumption depends on a large number of factors, many of which are time-varying, so it is advisable to use dynamic modeling of the energy performance of a building to provide comfort and quality energy use. A group of representative premises models for the characteristics of mass-building buildings was developed in the work. Dynamic modeling of energy characteristics was carried out for the air temperature regime in the premises of 20 and 22oC, which is typical for residential and social facilities. As well as refined model calculations of heating energy consumption for comfort air temperature tcom were done in the Energy Plus software environment. Regression model for determining the comfort temperature is created on the basis of exergy approach (exergy model of thermal comfort).This actual approach allows qualitative estimate of exergy consumption by the human body and the optimal conditions of thermal comfort, depending on the thermophysical properties of enclosures, orientation, mean radiation temperature and other characteristics.
The authors found that the energy need for heating calculated for the conditions tint=20 °C or tcom are almost indistinguishable in the annual section. However, the daily fluctuations of the mean radiation temperature stocktaking allows choosing a schedule of changes in the load on the heating system, taking into account the heat sensation of the person and the orientation of the premises outside. Similar studies for tint=22 °C and tcom indicate that the comfortable air temperature tcom will pass below tint=22 °C throughout the heating season and will not only provide comfort but also achieve savings. For Northern orientation, energy consumption is reduced by 12 %, for Southern orientation - by 1 9%.Key words: energy need, comfort conditions, dynamic modeling, comfort temperature, buildings energy performance
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