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1
Content available Impact of climate change on the safety of the foundation zone of steel tanks
Pawłowicz Joanna P., Skotnicka-Siepsiak Aldona, Szeląg Romuald A., Obolewicz Jerzy, Baryłka Adam
Inżynieria Bezpieczeństwa Obiektów Antropogenicznych
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2024
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Nr 1
13--22
EN
Climate change introduces the need to look at new issues in the safe operation of engineering structures. Analysis for the past decade has shown the significance of the weather changes taking place and the effects in the form of periodic long heat waves causing heating of external surfaces combined with solar radiation can cause significant structural impacts. Intense rainfall causing increased penetration of water into the ground also proves to be an important issue in terms of the proper condition of foundation zones. Performed studies have shown that in unfavorable conditions can lead to defects in the foundation zones of steel tanks.
2
Content available Gruntowy rurowy powietrzny wymiennik ciepła w wentylacji jednorodzinnych, zrównoważonych budynków mieszkalnych
Skotnicka-Siepsiak Aldona, Serrat Carles
Przegląd Budowlany
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2023
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R. 94, nr 9-10
38--41
PL
Wentylacja w zrównoważonych budynkach jednorodzinnych wymaga zastosowania nie tylko rozwiązań energooszczędnych, które czerpać będą maksymalnie z odnawialnych źródeł energii, ale muszą one również zapewnić prawidłowe funkcjonowanie obiektu w zmiennych warunkach zewnętrznych. Sprostać muszą one nie tylko dobowym i sezonowym zmianom otoczenia, ale również obserwowanym globalnie zmianom klimatycznym. Wymagania te spełniają gruntowe rurowe wymienniki ciepła (GWC). W poniższym artykule przeanalizowano eksperymentalne wyniki pracy tego urządzenia w polskich warunkach klimatycznych. Przeanalizowano okres jednego roku od września 2020 roku do końca sierpnia 2021 roku. Głównym celem pracy była nie tyle sama ocena ilości ciepła i chłodu pozyskanego z GWC, co ocena jego potencjału energetycznego w różnych układach wentylacji jednorodzinnego budynku mieszkalnego funkcjonujących w rzeczywistych, zmiennych warunkach otoczenia. W ramach badań rozpatrywano przypadek wentylacji grawitacyjnej i porównano pod względem zapotrzebowania energetycznego z trzema innymi przypadkami układów wentylacyjnych: wentylacją wyposażoną dodatkowo w GWC, wentylacją z rekuperacją i wysokosprawnym wymiennikiem ciepła oraz z wentylacją wyposażoną zarówno w GWC, jak i w rekuperację z odzyskiem ciepła.
EN
Ventilation systems in sustainable single-family homes require energy-efficient solutions that make optimal use of renewable energy sources and meet air quality and thermal comfort requirements in buildings. These systems should ensure a stable indoor environment and adequately respond to daily and seasonal fluctuations in temperature, as well as global climate change. Earth-to-air heat exchanges (EAHE) meet the above requirements. This article analyzes the performance of an EAHE in the Polish. The experiment covered a period of one year from the beginning of September 2020 to the end of August 2021. In addition to determining the heating and cooling loads, the main aim of the study was to evaluate the EAHE’s thermal performance in ventilation systems for single-family homes with different configurations under variable real-world conditions. Energy consumption in a building equipped with a natural ventilation system was compared with three other scenarios: a ventilation system coupled with an EAHE, a mechanical ventilation system with heat recovery and a high-efficiency heat exchanger, and a mechanical ventilation system with both an EAHE and heat recovery.
3
Content available Determining the degree of deformation in rain drainage installations through point cloud modeling
Pawłowicz Joanna A., Skotnicka-Siepsiak Aldona, Serrat Carles
Budownictwo o Zoptymalizowanym Potencjale Energetycznym
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2023
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Vol. 12
63--69
EN
Buildings are often complex and hindered by identifying and measuring deformation in both the building itself and its elements. However, we have the assistance of 3D laser scanning technology which allows us to collect geometric data. Scanners are particularly effective for measuring high and hard-to-reach locations. This paper focuses on the measuring and modeling of roof drainage installations, which are usually placed at elevated heights, making it impossible to measure using traditional methods. Rain gutters need constant monitoring in order to fulfill their function and ensure proper drainage of rainwater. Laser scanning produces a point cloud which can be converted in a 3D model using software such as Leica Cyclone, AutoCad and ReCap. This study demonstrates the successful utilization of laser scanning in identifying geometric features and deformations in building installations.
4
Content available Effect of rotational speed of a self-aspirating mixer on oxygen saturation in water
Wróblewski Andrzej, Skotnicka-Siepsiak Aldona
Polish Maritime Research
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2020
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nr 3
182--188
EN
There are two categories of gas-liquid mixers: conventional and special-purpose. In theory, any conventional mixer can be applied to aerate a liquid, but fast-rotating devices are generally preferred. Special-purpose mixers (tubular, prismatic, cylindrical) have a hollow shaft, and operate by drawing gas from above the surface of the liquid and dispersing it inside the liquid. This process is referred to as aspirated aeration. In contrast, conventional mixers increase the pressure of the aspirated gas. Gas drawn from above the surface of the liquid flows through channels bored inside the shaft and the impeller, and is introduced to the liquid in this way. This article presents the results of an experiment investigating the aeration efficiency of a six-tube self-aspirating mixer at different rotational speeds. The experiment was conducted in a flow tank. The results indicate that self-aspirating mixers are effective devices for water aeration and mixing.
5
Content available Comparing the efficiency of evacuated tube and flat-plate solar collectors in real installation conditions
Jurczak Marlena Anna, Skotnicka-Siepsiak Aldona
Budownictwo o Zoptymalizowanym Potencjale Energetycznym
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2020
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Vol. 9 Nr 2
31--38
EN
The subject of the work is an analysis of two types of solar collectors: flat-plate and evacuated tube collectors in the same, natural working conditions during the period from 1st May 2017 to 30th September 2017. The scope of work includes a descriptive presentation of a measuring setup, located on the roof of the building of the Construction University of Warmia and Mazury in Olsztyn, and also the research methodology, as well as an analysis of the results and conclusions obtained. The measurements allow a comparison of the efficiency of the flat-plate and evacuated tube collectors by calculating heat yields, based on the following variants: average hourly irradiation, outdoor air temperature, temperature of the medium supplying the collectors and temperature of the returning medium. An analysis of the heat yield was made in relations to the individual absorber surface, to determine which of the tested collectors showed higher efficiency under real operating conditions during the spring-summer period.
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