Pleikšnis, Staņislavs

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Pleikšnis, Staņislavs
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Pleikšnis, Staņislavs
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Pleiksnis, Stanislavs
Stanislavs Pleiksnis
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Email
stanislavs.pleiksnis@rta.lv
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Scopus Author ID
56728816400

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  • Publication
    Experimental justification for sapropel and hemp shives use as thermal insulations in Latvia
    (2015)
    Pleikšnis, Staņislavs 
    ;
    Maris Sinka
    ;
    Genadijs Sahmenko
    Fossil energy resources in Latvia are imported from other countries, but at the same time, our country is rich in renewable energy resources and other raw materials, which are used very little. In the study it is proposed to create a thermal insulation material from hemp shives grown in Latvia as a filler material and lake sediment - sapropel as a binding agent. Both of the following materials are organic, renewable and locally available. Laboratory experiments show that ecological and complying with modern requirements thermal insulation material can be obtained from local, renewable raw materials: sapropel and hemp shives.
    Scopus© Citations 8
  • Publication
    Thermal conductivity of experimental wall constructions of renewable insulating materials
    (2019)
    Edmunds Visockis
    ;
    Pleikšnis, Staņislavs 
    ;
    Ilmars Preikss
    ;
    Uldis Gross
    ;
    Juris Skujans
    Global scale environmental problems and economic issues are the main aspects what point out exigency to do research in the construction of renewable building materials. Renewable building materials are those materials that can be regenerated quickly enough and in theory, their production could be carbon-neutral. In order to evaluate the thermal efficiency of renewable materials in the framework systems of building envelope structures, test samples were made with the filling of renewable materials. The aim of the work is to find out the thermal conductivity coefficient of these natural composites and to compare them. Different size test samples were created for determination of thermal conductivity coefficient: 1.type as reference value: (width x height x depth) 290 x 290 x 30 mm; 2.type as experimental construction value (imitation of real wall construction): (width x height x depth) 980 x 980 x (165; 250; 345) mm. In this research as renewable insulating materials were used: maple leaves, legume (Galega orientalis), the composition of hemp shives (Bialobrzeskie) and sapropel with lime. A renewable insulating materials (also known as eco-thermal insulating) as alternative building materials discussed in this research work meets the requirements of the normative documents of the Republic of Latvia on sustainable construction principles. The analysis of results indicates significant difference among investigated materials – 0.040 W m-1K-1 lowest obtained value of thermal conductivity coefficient.
  • Publication
    3D MATHEMATICAL MODEL CHARACTERIZING THE DYNAMICS OF THE TEMPERATURE FIELD OF A WALL STRUCTURE WITH A DOUBLE-SIDED FACING FROM A SAPROPEL-HEMP COMPOSITE MATERIAL
    (2021)
    Sharif E. Guseynov
    ;
    Janis Rimshans
    ;
    Jekaterina V. Aleksejeva
    ;
    Aleksandrs Bereznojs
    ;
    Pleikšnis, Staņislavs 
    In this paper, a 3D mathematical model is proposed to determine the dynamics of the temperature field in a three-layer composite sapropel-hemp slab. The proposed model consists of a system of three initial-boundary value problems with respect to the temperature function for each layer, respectively, and one initial-boundary value problem with respect to the unknown velocity of heat propagation along the thickness dimension of the composite sapropel-hemp slab.
  • Publication
    Investigations in multiglass window thermal qualities
    (2017)
    Edmunds Visockis
    ;
    Raimunds Selegovskis
    ;
    Uldis Gross
    ;
    Pleikšnis, Staņislavs 
    Standard glass package windows for buildings have several drawbacks: the thermal qualities decreases during the service life. The task of the investigation is to define the necessary constructive parameters to develop window package that consists from several glass layers with the air gap between them, the thermal qualities of that remain during lifetime and the thermal conductivity of the window has to be like the thermal conductivity of another building boundary constructions. In contradistinction to the standard window package, where the gap between the glass layers is filled with special gas, in this case the gap is filled with ordinary air. The expenses of such construction can be less than for windows with the standard gas filled double or triple glass package. Moreover, the thermal conductivity of the standard gas filled package increases during lifetime, because, the gas is escaping out of package and the air is filling the gap instead. For high efficiency buildings, losses through windows are very essential. Such solutions allow to level heat losses on all building boundary surfaces. It is very important for buildings with low or zero energy consumption. Using of such windows will promote rational energy utilization. The thermal conductivity of the multiglass package is experimentally determined in the bench for determination of thermal conductivity and alculations of the heat losses through the package with different parameters are carried out.
  • Publication
    INVESTIGATIONS OF APARTMENT HOUSE CELLAR MICROCLIMATE AND IT’S IMPROVEMENT POSSIBILITIES
    (2019)
    Pleikšnis, Staņislavs 
    ;
    Edmunds Visockis
    ;
    Raimunds Selegovskis
    ;
    Sandra Gusta
    Apartment houses made in the last century in Latvia have rather big heat transfer factor and not good ventilation, especially in cellar. That leads to formation of condensate on building constructions. During cold weather in winter time, this condensate formats ice layer that damages building constructions ant also lead to inconvenience for inhabitants, for example, disturbs opening of cellar door. During investigations the cellar microclimate parameters, such as temperature, humidity and dew point, were measured and different ways to improve them and as result preventing of condensate formation were worked out. The measurements shows that sometimes the air temperature and the temperature on surfaces reaches dew point and therefore the condensate starts to format. The possibilities to eliminate humidity and to increase dew point are worked out during investigations.