Halina Koczyk

SELECTION OF THERMOPHYSICAL PROPERTIES OF HEAT STORAGE WALL

Abstract The paper discusses a method of the multilayered heat storage wall. Initial data: walls are multilayered, heat conductivity process is considered being one-dimensional, climatic factors and power supplied are periodic functions of time. In the paper mathematical and numerical models are presented. A mathematical model is constituted of a system of differential equations which describe heat conduction in material layers, equation of heat balance and boundary conditions system. Solving equations with regard to unknown property which has been recognized as a crucial parameter in the task one can obtain a real numeric value of the parameter. The paper is illustrated by the nomograms of calculated accumulating layer thickness and the scheme of an algorithm designed to calculate the thickness of accumulating layer.

Structural solutions impact on thermal energy efficiency of heating surface at an open space

AbstractThis paper presents studies on thermal energy efficiency of heating surface at an open space according to structural solutions and climatic conditions. Numerical simulation research was conducted to assess three different types of heating surfaces at an open space over chosen period of time in real weather conditions. Performance parameters such as surface temperature, supply temperature and efficiency of heating surface relative to constructional designs and model of control strategy used were analysed. The number, thickness and type of material layers beneath ground level were modified. The distance between heating pipes and their diameters were kept constant. The carried out analyses show that the used solutions can lead to significant differences in the performance and consequently in the energy efficiency of the heating system for open spaces.

Analysis of the possibilities to achieve the low energy residential buildings standards

AbstractThe article applies the global costs calculation method to the energy assessment of selected solutions for the technical equipping of buildings, dependant on their purpose and function. Representative archetypes, the life span of which were assumed to be 30-years, were used to estimate the performance of the minimum requirements according to the building regulations valid in 2013, current general standards, as well as low energy building and passive house standards. The subjects of the analysis were three residential buildings, for which the variability of the cladding and ventilation needs was assumed. In all analysed cases the application of four systems of energy supply to the building was also assumed. The optimal level of primary energy index value, dependant on the source of heat, was established by means of the global cost method. This level was then compared with the requirements presently valid in Poland. The analysis also allowed for the determination of the growth in investment costs, t...

Thermal comfort and energy consumption of the ecological house – simulation analysis of DOMTRZON

Thermal comfort and energy consumption of the ecological house – simulation analysis of DOMTRZON

APPLICATION OF TRANSPARENT INSULATION MATERIALS TO BUILDINGS HEATING IN PASSIVE SOLAR SYSTEMS

Abstract The aim of this paper is to present a numerical model, based on the finite difference method and able to describe the heat transfer in a room with indirect passive solar system in form of transparent insulation material (TIM) wall. Results of numerical calculations of thermal fields in TIM wall, in room with passive solar system, under climatic conditions of typical meteorological year for Poznan, are presented. Also the estimation of energy savings for selected rooms with TIM wall is given. Construction of a numerical model of building includes calculation of distribution of temperatures in all walls forming the enclosure, composition of system of energy balance equations for nodes representative of rooms and its solution. In numerical calculations of the thermal states of rooms with transparent walls, an analysis of respective components of thermal balance there has been conducted, in conjunction with required radiator heating power of automated heating installation—coacting with passive solar ...