Analysis of climate change and its potential influence on energy performance of building and indoor temperatures. Part 2: Energy and thermal simulation

In recent years, great emphasis has been placed on the introduction of energy-saving solutions to the construction sector. Building envelopes made of concrete with a specially selected composition give great opportunities in this regard. As part of a wide-ranging experiment, the authors undertook to diagnose how much thermal conductivity, volumetric specific heat and thermal diffusivity can be improved with an aerating admixture and different types of aggregates. Three groups of composites were tested: B1 – on stone aggregate, B2 – on expanded clay aggregate, B3 – on sintered fly ash aggregate. Each of the groups was divided into 4 formulations made without an aerating admixture and with its increasingly higher content of 0.8, 1.1, 1.4% in relation to the weight of cement. The thermal parameters were measured on the top (T) and bottom (B) surfaces of 36 rectangular samples (3 samples from each of the 12 mixtures) with the ISOMET 2104 apparatus. Diagnostic tests concerning the influence of measurement conditions were carried out on dry and water-saturated samples. It has been proven that for each composite and in both conditions, the values of thermal parameters determined on the lower surfaces will not correctly describe the properties of the real structure present in the main volume of the element. Only measurements carried out on surfaces with a structure corresponding to the interior of the element provide adequate data that can be used in decision-making processes and in numerical simulations to assess the real thermal qualities of building envelopes.

Section: Discussionmentioning

confidence: 99%

The influence of measurement conditions on the determined values of thermal parameters of different types of concrete

Garbalinska,

Matys

2024

“…Of course, an important aspect of the building's energy efficiency remains its architectural features, in particular the size and orientation of the building block, as well as the efficiency of the operation of internal engineering networks. A smart combination of external protection and receivers of solar energy and converters of it into thermal energy allow to ensure the functioning of heating systems and hot water supply systems [1][2][3][4][5][6][7].…”

Section: Introductionmentioning

confidence: 99%

Investigation of thermal and air efficiency in trombe wall of modular building

2023

The proposed Trombe wall design is an innovative and effective solution for addressing issues related to building energy efficiency. The Trombe wall can help reduce a building's energy consumption, provide optimal indoor temperature, and minimize the building's environmental impact by utilizing renewable energy sources.The article deals with the study of the heat-air characteristics of the Trombe Wall, which performs the functions of external protection of a modular house, with the aim of further evaluating the possibility of using it as a hybrid protection with additional heating and ventilation functions assigned to it. The results of experimental research conducted on one of the elements of external protection of a modular house in the form of the Trombe Wall are presented. The experimentally obtained graphic dependences were compared with the calculated data and the convergence was evaluated. The proposed design allows you to organize air exchange in the premises with a multiplicity within 1-1.5 h −1 , and also provides an opportunity to provide additional thermal power in the amount of 250 W/m 2 . The article presents the results of experimental studies that allow to evaluate the thermal characteristics of the proposed design of external protection for a modular house. These results indicate that with the given geometric dimensions, in particular with a volume of 14 m 3 , the thermal power utilized by the Trombe wall is within 0.2-0.7 kW.

“…Information on air quality was collected over a period of 1 year. The World Health Organization defines the standards for suspended dust concentrations at the following level [1]:…”

Section: Introductionmentioning

confidence: 99%

Application of the internet of things (IoT) technology for controlling air purification in the apartment

2023

Persistent air pollution (SMOG) in large cities in countries based on energy and coal heating is a serious and growing problem. Improving air quality is currently the main challenge for the metropolises of Central and Eastern Europe. Despite intensive efforts, the average annual concentration of PM2.5 in this area exceeds the standard recommended by the World Health Organization (recommended standard -25 μg). Data from environmental institutions show that, for example, in Kraków (Poland), the number of days with PM 2.5 concentrations drastically exceeding the permissible standards in the last year was 96. The article describes the method of controlling air purification in the apartment using automation devices, control software and applications available for smartphones, tablets and personal computers. The presented solution uses technologies that can use free (alternative) software, extending the functionality of devices and increasing the flexibility of the control system. The main goal is to maximize the comfort of home users and to minimize the cost of electricity consumption. Additionally, the existing air cleaning devices are adapted to the needs of the air cleaning control system.