Technical Transactions. Iss. 5

Technical Transactions. Iss. 5

Type: Collection of magazine numbers
Release date

Collection items (14)


A particle size distribution measurements of selected building materials using laser diffraction method

Prałat, Karol, Krymarys, Ewa
Article
2018
This article presents the results of experimental research to determine the size of powder graining in building materials, specifically, gypsums (Dolina Nidy, Pinczow) and adhesives (Atlas Sp. z o.o., Lodz, and Weber Saint-Gobain, Warsaw). A modern laser diffraction method for measuring the distribution of particle sizes with respect to their diameters was applied. During the experiment, three series of measurements were conducted for each material. Data relating to the graining of building materials is crucial because it is one of many aspects that directly affects the binding time and defines its potential applications in the construction industry.

Technical Transactions. Iss. 5

Number of the magazine
2018

Methods of identifying the optimal positioning of different products within a warehouse with regard to minimising the costs associated with order picking

Lorenc, Augustyn, Szkoda, Maciej, Wyraz, Elżbieta
Article
2018
The most important factors conditioning the competitiveness of a warehouse are time and money. A randomly or improperly chosen storage process influences three types of costs: the movement of goods, waiting time, transportation costs. To increase the effectiveness of goods completion, i.e. to decrease processing time and cost, appropriately selected methods of product classification are used. In the article, the authors have done simulations of product classification for an ABC analysis, an ABC analysis together with a COI index, an ABC analysis together with an XYZ analysis, a COI index only, and the method of free product storage places. Simulations were made for two variants taking into account the need and there is no need to shifting products on the completion trolley during the whole completion process.

Greenhouse systems in quasi-stationary and dynamic modelling

Grudzińska, Magdalena
Article
2018
The ISO 13790 standard presents two quasi-stationary calculation methods for including greenhouse systems in the evaluation of a building’s energy balance – a detailed and a simplified method. These adopt different assumptions with regard to solar gains in sunspace and in adjacent heated rooms; thus, the calculation results of the internal temperature of the sunspace and the energy demand in heated spaces may differ. This work presents the comparison of energy effects achieved due to the sunspace in an example living space, calculated by means of both quasi-stationary methods and more accurate dynamic simulations with an hour time step. Analysis of the results obtained by means of the described methods has enabled the identification of the advisable range of each of the calculation methodologies.