https://ir.lib.vntu.edu.ua//handle/123456789/31697 2026-04-14T21:27:53Z 2026-04-14T21:27:53Z Biks, Y. S. Ratushnyak, O. G. Бікс, Ю. С. Ратушняк, О. Г. https://ir.lib.vntu.edu.ua//handle/123456789/37342 2023-06-07T09:37:49Z 2021-01-01T00:00:00Z

Assessment of envelope’s thermal performance by different MCDA techniques Biks, Y. S.; Ratushnyak, O. G.; Бікс, Ю. С.; Ратушняк, О. Г. The assessment of the thermal performance of multilayered envelopes was performed by different techniques of MultiCriteria Decision Analysis (MCDA). There was a proposed integral index of thermal performance as a comprehensive evaluation parameter. As key influence criteria were taken into consideration as follows: the u-value of the envelope W/m2K, the dimensionless decrement factor of the envelope f, the internal areal heat capacity of the envelope k1, kJ/m2K according to ISO 13786:2017, the cost of the wall material, UAH/m2 and the mass of the wall kg/m2 . There were compared eight types of wall assemblies from natural materials: hempcrete, adobe, strawbale panel, earthbag, cordwood, SIP, hempcrete+straw and compositional building thermo-block. The comparison of the alternatives was proceeded by such MCDA techniques as AHP, TOPSIS, Grey relation analysis (GRA) and Criteria Importance Theory (CIT). Conducted research revealed that only two of eight wall types could be approximately defined as “medium” and “best” ones in proposed terms of thermal performance – Wall from SIP and Wall from Cordwood. respectively.

2021-01-01T00:00:00Z Gurskis, V. Šadzevičius, R. Ramukevičius, D. https://ir.lib.vntu.edu.ua//handle/123456789/37341 2023-06-07T09:28:33Z 2021-01-01T00:00:00Z

Mechanical properties and thermal conductivity of lime–hemp concrete Gurskis, V.; Šadzevičius, R.; Ramukevičius, D. The mechanical and thermal properties of lime-hemp concrete (hempcrete) were analysed in the paper. For the testing of hempcrete, three compositions of mixtures were prepared using binders and filler (hemp shives) ratio 2.2: 1. Quicklime was used as the main binder. Part of the mixtures were produced using a mixture of binders in which 10% of lime has been replaced by cement or organic sapropel. The research results have shown 459 ... 497 kg / m3 density of hempcrete. Hempcrete made with a mixture 10% cement has a higher density, with 10% sapropel - a lower density. The compressive strength testing results shows that organic sapropel-containing hempcrete is weaker than made with mineral binders. The results of the thermal conductivity research shows that the hempcrete with the mineral binders has the highest thermal conductivity, with sapropel - a lower thermal conductivity.

2021-01-01T00:00:00Z Ostapenko, O. Остапенко, О. П. https://ir.lib.vntu.edu.ua//handle/123456789/37340 2023-06-07T09:13:57Z 2021-01-01T00:00:00Z

Features of research and evaluation of efficiency of heat pump cycles with using the SOLKANE® programs Ostapenko, O.; Остапенко, О. П. The analysis of features of research and an estimation of efficiency of cycles of heat pumps with use of the Solkane® programs at training of experts in a specialty "heat power engineering" was carried out. The capabilities of the programі can be used for training specialists in the specialty "heat power engineering", which aims to study, design and evaluate the effectiveness of energy supply systems with heat pump installations, optimization of modes of operation of energy supply systems with heat pumps.

2021-01-01T00:00:00Z Слободян, Н. М. Баран, О. С. Slobodian, N. Baran, A. https://ir.lib.vntu.edu.ua//handle/123456789/37339 2023-06-07T08:59:06Z 2021-01-01T00:00:00Z

Аналіз систем опалення будівель Слободян, Н. М.; Баран, О. С.; Slobodian, N.; Baran, A. Нагальним завданням сьогодення є зменшення теплоспоживання у житлово – комунальному секторі без погіршення температурно – теплового комфорту у приміщеннях.; Urgent tasks of present time is reduction of теплоспоживання in dwelling - communal sector without worsening temperature - thermal comfort in apartments.

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