Scholarly record

ENERGY CALCULATION DEPENDING ON CARBON DIOXIDE CONCENTRATION

Zdenek Galda

Abstract

The microclimate of buildings forms an integral part of everyoneпїЅs life, because each of us spends a part of the day, sometimes more, sometimes less, in the closed premises of buildings. It is a specific part of climate that has a dynamic development and mainly comprises temperature, humidity and concentration of harmful substances in the premises. And one of these is CO2. This paper follows the author's previous publications which also deal with the issue of CO2 concentration in building premises, including the variable flow of fresh air and the influence of higher CO2 concentrations on human health. Now, the study focuses on partial numerical verification of previously measured details of microclimate, and the influence of CO2 concentration on the energy intensity of buildings. A numerical simulation tool and simulation of climatic conditions of already measured premises were used to simulate the distribution of temperatures and air flow in a room with an emphasis on total aeration of the tested premises. The generated three-dimensional model of the building and tested room has clearly defined boundary conditions calculated close to the realistic condition of the practical measurements conducted. Calculation and simulation were done using the Finite Element Method (FEM); in particular, the Computational Fluid Dynamics (CFD) method. In order to achieve the best possible results of simulation prediction, we need optimal continuum discretization into a high number of finite spatial elements of an appropriate shape. The energy calculation core of the Design Builder software comprises the EnergyPlus system that calculates dynamic simulations including specific predictions of the building's energy intensity, including many other physical quantities of air flow in interiors for adequate verification of model situations with already measured realistic values.

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