scholarly journals Multicriteria assessment of selected types of ceilings

2018 ◽  
Vol 219 ◽  
pp. 04011
Author(s):  
Julia Nowak ◽  
Edyta Plebankiewicz
Keyword(s):  
Comparative Analysis ◽  
Thermal Insulation ◽  
Execution Time ◽  
Lower Surface ◽  
Sound Insulation ◽  
Multicriteria Assessment ◽  
Comparison Criteria

The paper compares three systems of the rib-and-slab ceiling: Vector, Rector and Teriva. The following comparison criteria were selected: the tare weight of ceiling beams, execution time, slab faulting, sound insulation, thermal insulation and aesthetics of the lower surface. The results of the multicriteria comparative analysis clearly indicated the advantage of the Vector ceiling, assuming the same weights for all criteria taken into account.

Cryogenic thermal insulating and mechanical properties of rigid polyurethane foams blown with hydrofluoroolefin: Effect of perfluoroalkane

2021 ◽  
pp. 0021955X2110626
Author(s):  
Tae Seok Kim ◽  
Yeongbeom Lee ◽  
Chul Hyun Hwang ◽  
Kwang Ho Song ◽  
Woo Nyon Kim
Keyword(s):  
Mechanical Properties ◽  
Thermal Conductivity ◽  
Thermal Stability ◽  
Cell Size ◽  
Thermal Insulation ◽  
Coefficient Of Thermal Expansion ◽  
Lower Surface ◽  
Polyurethane Foams ◽  
Insulation Material ◽  
Pu Foams

The effect of perfluoroalkane (PFA) on the morphology, thermal conductivity, mechanical properties and thermal stability of rigid polyurethane (PU) foams was investigated under ambient and cryogenic conditions. The PU foams were blown with hydrofluorolefin. Morphological results showed that the minimum cell size (153 μm) was observed when the PFA content was 1.0 part per hundred polyols by weight (php). This was due to the lower surface tension of the mixed polyol solution when the PFA content was 1.0 php. The thermal conductivity of PU foams measured under ambient (0.0215 W/mK) and cryogenic (0.0179 W/mK at −100°C) conditions reached a minimum when the PFA content was 1.0 php. The low value of thermal conductivity was a result of the small cell size of the foams. The above results suggest that PFA acted as a nucleating agent to enhanced the thermal insulation properties of PU foams. The compressive and shear strengths of the PU foams did not appreciably change with PFA content at either −170°C or 20°C. However, it shows that the mechanical strengths at −170°C and 20°C for the PU foams meet the specification. Coefficient of thermal expansion, and thermal shock tests of the PU foams showed enough thermal stability for the LNG carrier’s operation temperature. Therefore, it is suggested that the PU foams blown by HFO with the PFA addition can be used as a thermal insulation material for a conventional LNG carrier.

scholarly journals Analysis of the structure of door bottom drop sealing device

2021 ◽  
Vol 236 ◽  
pp. 02027
Author(s):  
Yuan Fei
Keyword(s):  
Comparative Analysis ◽  
Structural Features ◽  
Sound Insulation ◽  
The Common ◽  
Sealing Device

-Drop Seals Is A Kind Of Hardware That Can Solve The Tightness Of The Door Bottom. This article will briefly introduce the common structural features of this hardware and analyze its impact on the sound insulation of the door leaf according to the experiment. Based on the comparative analysis of 5 sets of data, the experiment proved the effectiveness of the drop seals for the door bottom seal.

scholarly journals The comparative analysis of modern ETL tools

2021 ◽  
Vol 19 ◽  
pp. 126-131
Author(s):  
Vitalii Mayuk ◽  
Ivan Falchuk ◽  
Piotr Muryjas
Keyword(s):  
Comparative Analysis ◽  
Data Warehouse ◽  
Execution Time ◽  
Analytical Data ◽  
Time Efficiency ◽  
Transactional Data ◽  
Research Efficiency

Each data warehouse requires loading properly processed transactional data. The process that performs this task is known as extract-transform-load (ETL). The efficiency of its implementation affects how quickly the user will have the access to the current analytical data. The paper presents the results of research efficiency of ETL performance of its stage with the use of Azure Synapse (AS) and Azure Data Factory (ADF). The research included selection, sorting and aggregating data, joining tables, and loading data into target tables. To evaluate the efficiency of these operations, the criterion of their execution time has been used. The obtained results indicate that the ADF tool provides a much higher time efficiency of loading transactional data into the data warehouse comparing to AS.

scholarly journals Method of multicriteria assessment of business entities in the process of anti-crisis management

2020 ◽  
pp. 18-28
Author(s):  
O.F. Bystrov ◽  
◽  
A.A. Rubtsova ◽  
Keyword(s):  
Comparative Analysis ◽  
Crisis Management ◽  
Financial Stability ◽  
Basic Algorithm ◽  
Multicriteria Assessment ◽  
Business Entities

The basic algorithm of the BOF method is described. The method of applying the BOF method is presented in the case of both positive and negative values of quantitative values of indicators, using the transition from real values to encoded ones. The proposed method is an innovation that allows you to conduct a comparative analysis of any number of enterprises and projects in terms of their financial stability. The methods described in this article can be used for crisis management, as well as for calculating the balance of a portfolio of projects and programs.

Ensuring energy efficiency of refrigeration piping

2021 ◽  
pp. 45-52
Author(s):  
G.I. Petrov ◽  
V.N. Kornienko ◽  
A.G. Donetskikh
Keyword(s):  
Energy Efficiency ◽  
Comparative Analysis ◽  
Thermal Insulation ◽  
Raw Materials ◽  
Thermal Characteristics ◽  
Operational Reliability ◽  
Insulating Materials ◽  
Insulation Materials ◽  
Synthetic Rubber ◽  
Materials Used

Improving energy efficiency and energy saving in refrigeration technology depends largely on the use of modern thermal insulation materials in the thermal insulation structures of refrigeration pipelines. The article presents a comparative analysis of the thermal characteristics and operational properties of heat-insulating materials used in refrigeration. The features of RUFLEX thermal insulation materials based on foamed synthetic rubber produced from domestic raw materials and their compliance with the requirements of energy efficiency, durability, operational reliability and safety are considered.

Study on Properties of Foam Concrete Based on Fractal Theory

2011 ◽  
Vol 194-196 ◽  
pp. 1916-1919 ◽  
Author(s):  
Wen Ling Tian ◽  
Jiang Bo Yang ◽  
Xiao Yan Zhao
Keyword(s):  
Fractal Dimension ◽  
Fly Ash ◽  
Thermal Insulation ◽  
Fractal Theory ◽  
High Strength ◽  
Sound Insulation ◽  
Foam Concrete ◽  
Insulation Property ◽  
Foaming Agent ◽  
Thermal Insulation Property

Foam concrete is provided with light weight, thermal insulation, sound insulation and fire resistance, good seismic performance and other characteristics. To improve properties of foam concrete microstructure is studied with the help of fractal theory, fractal dimension related to mechanical properties and thermal performance of foam concrete is calculated by MATLAB language program. The results indicate that the microstructure of foam concrete showed significant fractal character, the fractal dimension is between 1.3 and 2.0. Apparent density, 28d compressive strength, and thermal conductivity decreases with the increase of fly ash and foaming agent content, fractal dimension increased. Formulas of fractal dimension and the fly ash, foaming agent content were established. Foam concrete with low density, high strength, and good thermal insulation property will be prepared conducted by the formulas.

Measuring the sound insulation of an external thermal insulation composite system (ETICS) by means of vibrometry

2017 ◽  
Vol 141 (5) ◽  
pp. 3595-3595
Author(s):  
Daniel Urbán ◽  
Bert Roozen ◽  
Alexander Niemczanowski ◽  
Herbert Muellner ◽  
Peter Zaťko
Keyword(s):  
Thermal Insulation ◽  
Composite System ◽  
Sound Insulation

scholarly journals Comparative Analysis of the Thermal Insulation of Multi-Layer Thermal Inserts in a Protective Jacket

Materials ◽  
2020 ◽  
Vol 13 (12) ◽  
pp. 2672
Author(s):  
Dubravko Rogale ◽  
Goran Majstorović ◽  
Snježana Firšt Rogale
Keyword(s):  
Thermal Properties ◽  
Comparative Analysis ◽  
Thermal Insulation ◽  
Professional Services ◽  
Cold Weather ◽  
Complete Analysis ◽  
Thermal Manikin ◽  
Scientific Methods ◽  
Textile Materials ◽  
Measurement Results

This paper presents the measurement results of the thermal insulation of the outer shell, thermal inserts, and clothing systems, as well as a comparative analysis of the thermal insulation of multi-layer thermal inserts in a thermal jacket intended for professional services in cold weather. Detachable thermal inserts are made of double-faced, diamond-shaped quilted lining with different masses per unit area, and together with the jacket, they form clothing systems with different thermal properties. Tests of the thermal properties of clothing were performed on a thermal manikin. They showed that an increase in the mass of thermal insulation textile materials contributes to an increase in the thermal insulation properties of clothing and are insufficient for a complete analysis of the thermal properties of clothing. Therefore, for the first time, three new parameters of integration efficiency of the thermal insert, thermal insulation efficiency parameters, and efficiency parameters of the integration of the textile material integrated into the clothing system were introduced. Based on these parameters, it is possible to perform an effective and accurate comparative analysis of the thermal insulation of multi-layer thermal inserts in clothing. This makes it possible to apply exact scientific methods largely in the technical design of the thermal properties of integrated textile materials, instead of experience-based methods as in the past.

The Heating Energy Consumption Analysis and Energy Saving Transformation for the New Rural Apartment

2015 ◽  
Vol 744-746 ◽  
pp. 2318-2323
Author(s):  
Xiao Rui Liu ◽  
Shu Hui Xu ◽  
Yang Guo ◽  
Qing Ru Hao
Keyword(s):  
Energy Consumption ◽  
Comparative Analysis ◽  
Energy Saving ◽  
Thermal Insulation ◽  
North China ◽  
Present Situation ◽  
Energy Consumption Analysis ◽  
Before And After ◽  
Heating Energy Consumption

The main purpose of this test is to analysis heating energy consumption in new rural apartments in north china. At the first, we analysis the present situation of energy consumption and feature for new apartment in north china, then we proposed the measures to improve the performance of energy saving thermal insulation in new apartment in the area of north china, we conducted comparative analysis for energy consumption in new apartment before and after energy saving.

Research on the Performance of Silt Sintered Insulating Brick and Key Molding Equipment

2014 ◽  
Vol 919-921 ◽  
pp. 2002-2006
Author(s):  
Hong Mei Liu ◽  
Yuan Bin Xu ◽  
Cheng Qun Wu ◽  
Ai Dong Zhu ◽  
Jun Qiu Zuo
Keyword(s):  
Thermal Insulation ◽  
Structural Design ◽  
Building Materials ◽  
High Strength ◽  
Sound Insulation ◽  
Critical Part ◽  
Research Status ◽  
Future Developments ◽  
Important Position

Silt sintered insulating brick with high strength, good thermal insulation and sound insulation characteristics. It occupies an important position in the new building materials industry. The main equipment for production of silt sintered insulating brick is the vacuum brick extruding machine, the forming mold is the most critical part in it. The performance largely determines the quality of the brick. The structural design and other aspects of the forming mold are analyzed, and then systematically summarize the design and production requirements of the forming mold. The research status of the forming mold on vacuum brick extruding machine at domestic and abroad is reviewed. The main problems of forming mold are analyzed and the corresponding solutions are given, as well as the future developments of forming mold.

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