Anna Sedláková

Analysis of material solutions for design of construction details of foundation, wall and floor for energy and environmental impacts

The amount of materials and energy resources is limited over the world. These issues lead to increasing interest in environmental impacts of buildings using various building materials and structural systems. Buildings play a significant role in energy consumption and emission production through all phases of their life cycle. Over the last decade, development toward sustainability has become an important issue in building design decisions. The relative contribution of embodied impacts of building materials and constructions has been recognised as being significant, especially for energy-efficient buildings. Life-cycle assessment as a widely used methodology helps make decisions in sustainable building design. The construction details of the foundation, wall and floor are by far the most significant contribution of embodied impacts associated with the construction phase. The goal of this paper is to assess alternative material solutions for the construction details of foundation, wall and floor to support decisions at the design phase of a project. The selection and combination of the materials influences the amount of energy consumption and associated production of emissions during the operation of the building. Therefore, the thermo-physical properties of designed variants of construction details are very significant. This study uses life-cycle analysis with system boundary from cradle to gate and focuses on the embodied energy and equivalent emissions of CO2 and SO2. Methods of multi-criteria decision analysis are used for interpretation of the results.

Predicting Annual Heating Demand under Sensitivity Analysis

The quality of most buildings may be affected during the initial phase of architectural design. It is therefore to optimize input parameters, which significantly influence energy efficiency. In principle it is possible to speak of a deterministic approach, which consider the input parameters to be fixed or a stochastic approach, which takes a wider set of input parameters into account. A single-storey house is evaluated in terms of energy performance in the initial phase of building design, where input parameters are changed in order to determine a correlation coefficient. The methodology is based on a sensitivity analysis (SA) and MonteCarlo simulation based on a stochastic random selection. Regression (RA) were written to express the impact architectural design has on energy performance. Feedback from the regression model estimates annual heating demand of single storey house.

Modeling the Air Channel Ventilation in Ansys CFX of a Romanesque Church

Moisture is a major source of damage in historic solid masonry. Rising damp is a well-known phenomenon around the world and occurs when groundwater flows into the base of a construction and is allowed to rise through the pore structure. From practical experience it is known that many factors may play a role regarding permeability problems in masonry. The amount of possible causes of moisture problems in historic masonry underlines the complexity of this phenomenon. Evaporation is an important factor in rising damp. The surface of an affected wall contains moisture that has risen from the ground and this moisture is then subject to evaporation. The factors controlling evaporation include: temperature, humidity, air movement and surface.

Solutions of Ground Floor for Energy Efficient Buildings—Economic Evaluation

Do you think that passive houses are inventions of recent years? It is not exactly true. Even if they use more advanced technology, some of the basic principles goes back hundreds years. History of passive houses have their roots in the 19th century, where the first building was not a building, but research ship of polar explorer Fridtjof Nansen called From in 1883. Walls and sandwich construction deck had thickness of 400 mm, which fulfill the function of thermal insulation layer of felt and linoleum fulfill the function of a vapour barrier. Glass treated windows were triple and worked there controlled ventilation with electric ventilators.

Remedial Method against Moisture Problems – Church of St. Abdon and Sennen in Gemersky Jablonec

Abstract Moisture is a major source of damage in historic solid masonry. Rising damp is a well-known phenomenon around the world and occurs when groundwater flows into the base of a construction and is allowed to rise through the pore structure. From practical experience it is known that many factors may play a role regarding permeability problems in masonry. The amount of possible causes of moisture problems in historic masonry underlines the complexity of this phenomenon. Evaporation is an important factor in rising damp. The surface of an affected wall contains moisture that has risen from the ground and this moisture is then subject to evaporation. The factors controlling evaporation include: temperature, humidity, air movement and surface.

Analysis of New Generation Material Solutions of Lower Structure for Energy Efficient Buildings

The goal of this paper is to calculate of thermal physical and environmental parameters of lower structure to support decision at the design phase of the project. The solutions are towards reduced embodied environmental impacts and improved energy performance. This study uses life cycle analysis in system boundary from Cradle to Gate and focuses on environmental indicators such as embodied energy and emissions of CO2eq. and SO2eq. The selection and combination of materials influence amount of energy consumption and associated production of emissions during building operation phase.

Analysis of Material Solutions of Exterior Walls with Contact Thermal Insulation System

Nowadays, heating energy demand has become a significant estimator used during the design stage of any new building. The residential building sector consumes a significant amount of fossil fuel energy and thereby produces a large percentage of greenhouse gas emissions that contribute to global warming and climate change. The aim of the paper is analysis of thermo-physical and environmental parameters of proposed versions of exterior wall structures.

Heat load elimination by using displacement ventilation in a classroom

A b s t r a c t The target of this contribution is to know if we can use displacement ventilation for the so-called free cooling of a room. What flow rate of air do we need in order to sufficiently reduce the thermal loads in the classroom? We search for the answer to this question by using CFD tools. We only use air from the exterior without any cooling system.

CFD Model of an Underfloor Air Cavity Created from Special Fittings and its Verification Using a Laboratory Model

Recently, there has been a tendency of increased complete reconstructions of historical buildings that have not been administered, nor used and have subsequently fallen into disrepair. The acting humidity can be effectively removed, using ventilated floors. The paradox is that these methods have been used for many centuries and until recently, only in laymans terms. The remaining problem involves drafts in air cavities in general. To assess the airflow in the air cavity, recently commonly used CFD simulations can be employed. In this article CFD simulation of underfloor air cavity created by special fittings is verified by means of laboratory experiment.

CFD Proposals for the Layout of Air Vents for Realization of Underfloor Air Cavity Created from Special Fittings

Abstract In basement acting humidity can be removed using ventilated flooring created from special fittings. Particular attention should be paid to the design layout of inlet and outlet of openings. The aim of the correct proposal is the even distribution of air flow over the whole surface of the cavity. To achieve this state and to objective evaluate the air flow in the gaps, which are made up of shaped objects, the work uses CFD simulations. Based on computational simulations, structural designs of underfloor air cavities created using special fittings are designed. As results are the proposals for the layout of air vents for historic buildings for realization in Kosice.