75504 2712-8172 2 46 2014 1-78

CHR RUS 4-4 Peter the Great Saint Petersburg Polytechnic University Yakubson Vera engstroy@inbox.ru

Polytechnicheskay, 29

The conference of Russian Association of Engineers for Heating, Ventilation, Air-Conditioning, Heat Supply and Building Thermal Physics (ABOK) On April, 11th, in Lenexpo the XVI conference of Russian Association of Engineers for Heating, Ventilation, Air-Conditioning, Heat Supply and Building Thermal Physics (ABOK) “Effective HVAC and Heat Supply Systems” took place. There were a lot of presentations of new equipment for building systems and networks. All these reports were dedicated to the ways to make buildings more comfortable for people, to increase the energy efficiency, to reduce expenses and to improve the production efficiency. But besides the specific equipment, there were some reports dedicated to more general problems in design, installation and maintenance of building systems and networks. 10.5862/MCE.46.1 building systems and networks ventilation air-conditioning energy saving conference https://engstroy.spbstu.ru/article/2014.46.1/ 01.pdf

RAR RUS 5-13 National Research Tomsk Polytechnic University Polovnikov Vyacheslav polov@tpu.ru National Research Tomsk Polytechnic University Glazyrin Evgeniy evgen2103@sibmail.com Numerical analysis of the impact of engineering constructions on heat loss of channel-free heat pipelines The work shows the results of mathematical modelling of thermal conditions for channel-free heating network laid in the areas of influence of engineering constructions, as well as the results of numerical analysis of heat losses in the objects under examination. The regularities of heat transfer in the system concerned and the factors influencing intensification of heat losses are revealed. The heat losses in channel-free pipes laid in the areas of engineering constructions influence have been found to decrease in the range from 1.53 to 10.79%, depending on the temperature inside any given engineering structure and geometric characteristics of the system under examination. It is demonstrated that the standard method of heat loss calculation for channel-free heating pipes overestimates values of heat loss. 10.5862/MCE.46.2 mathematical modeling channel-free heat pipelines heat loss engineering constructions https://engstroy.spbstu.ru/article/2014.46.2/ 02.pdf

RAR RUS 14-23 North-Eastern Federal University in Yakutsk Akimov Mir mir_akimov@mail.ru North-Eastern Federal University in Yakutsk Mordovskoy Sergey msd@mail.ru Institute of Oil and Gas Problems, Siberian Branch of the Russian Academy of Sciences Starostin Nikolay nikstar56@mail.ru Calculating thermal insulation thickness and embedment depth of underground heat supply pipeline for permafrost soils In this work the authors considered a freezing-and-melting process of soils under the polyurethaneinsulated polyethylene heating pipeline, which is used in the regions with permafrost soils. Temperature field dynamics of the “pipeline – soil” system is determined by heat conductivity equation in polar coordinate system. The corresponding two-dimensional Stefan problem is solved by the finite differences method. The authors propose to determine the thickness of pipeline thermal insulation and the embedment depth upon the condition of melting depth reduction to an annual thawed layer of soil identified before the heating season. There are presented results of isotherm calculations for underground heat supply pipelines interacting with frozen soil. These results show that reduction of melting depth to annual thawed layer is probable. The calculations were carried out for simulated soil and temperature conditions of Yakutsk, Republic Sakha, Russia. Nevertheless, the results obtained can be applied in other permafrost areas. 10.5862/MCE.46.3 pipeline permafrost temperature the Stefan problem thawing depth embedment depth insulation thickness https://engstroy.spbstu.ru/article/2014.46.3/ 03.pdf

RAR RUS 24-35 Moscow State Civil Engineering University Solovyev Aleksey k.solovev@yandex.ru National Research Moscow State Civil Engineering University Tusnina Olga lazoltus@mail.ru A comparative thermal analysis of systems of the upper daylight (clerestory and daylight guidance system) Daylight guidance systems are quite effective devices. Such systems are able to reduce the artificial lighting costs of a building and improve employees’ work conditions inside. In this paper, a comparative thermal analysis of two types of natural roof lighting systems is presented. The analysis has been performed for a roof equipped with a daylight guidance system, being a more contemporary type of lighting, as well as for a roof with clerestory, which is a more traditional and widespread type. The thermal analysis is performed by numerical method featured by two computer programs – NASTRAN and TEPL, making it possible to increase reliability of the results. The analysis shows that application of daylight guidance systems improves thermal performance of a structure and increases the value of thermal resistance of structure’s envelopes. Thus, one more benefit of applying daylight guidance systems is revealed. 10.5862/MCE.46.4 thermal resistance thermal analysis daylight guidance system clerestory https://engstroy.spbstu.ru/article/2014.46.4/ 04.pdf

RAR RUS 36-46 57140834000 0000-0002-5895-1306 National Technical University of Ukraine “Igor Sikorsky Kyiv Polytechnic Institute” Sukhodub Irina ira_krot@ukr.net

Kyiv, Ukraine

6506189670 0000-0002-8218-3933 National Technical University of Ukraine “Igor Sikorsky Kyiv Polytechnic Institute” Deshko Valeriy te@kpi.ua

Kyiv, Ukraine

Exergy analysis of ventilation systems with energy recovery Thermal, mechanical and chemical components of room air exergy and its change depending on the outside air parameters (temperature, humidity and pressure) have been examined for different periods of the year, using the climatic data for Kiev (IWEC). In winter the thermal component dominates, whereas in summer the chemical one prevails. Various approaches to exergy efficiency definition of ventilation systems with energy recovery (namely, a universal, functional and maximum exergy efficiency) have been analyzed at different boundaries of the system (in a heat exchanger and in in an installation at large). Dependence of these parameters on the temperature and moisture content of outdoor air (reference environment) was studied. In addition, there have been calculated weighted average exergy efficiency coefficients for cold and warm periods of the year for the city of Kiev. 10.5862/MCE.46.5 ventilation energy saving energy recovery exergy analysis membrane heat exchanger https://engstroy.spbstu.ru/article/2014.46.5/ 05.pdf

RAR RUS 47-57 Military Space Academy named after A.F. Mozhaysky Soldatenko Vladimir soldatenko_vs@mail.ru Military Space Academy named after A.F. Mozhaysky Kharin Vitaliy kh.vet@rambler.ru The method to justify rational variant points of monitoring technical condition of engineering systems in unique buildings and structures While necessarily monitoring technical condition of bearing designs of unique buildings and structures, the same monitoring must be done to the items of their engineering systems. To do so, certain monitoring points are designed. The objective here is to make choice among rational measurement instruments taking into account some resource restrictions and several rationality criteria. It is also necessary to consider great uncertainty conditions of design and creation of unique buildings and structures. This involves participation of experts, whereas the fuzzy logic theories are supposed to be applied in order to process examination results. The article deals with an approach to designing some rational option for instrument structure of monitoring point, based on the analysis of integrated efficiency of the used measurement techniques to control technical condition of engineering systems. The way of transition from individual indicators of control devices’ efficiency to integrated efficiency indicators of the point of monitoring has been proposed, basing on the knowledgebase model in the form of production inference rules. Such an approach allows identifying the most effective measuring technique for each object of a unique building by a complex of certain indicators estimated by experts. The obtained results may bring about a significant cost reduction when solving a problem of instrument base justification for statistical methods of monitoring at the expense of refusing from time-consuming natural tests. 10.5862/MCE.46.6 technical condition of engineering systems measuring technique linguistic variable knowledgebase production inference rule https://engstroy.spbstu.ru/article/2014.46.6/ 06.pdf

RAR RUS 58-64 Institute of Water Problems and Land Reclamation Pobereznichenko Olga olia-olenia@ukr.net Institute of Water Problems and Land Reclamation Homutetskaya Tatyana itsk@bigmir.net Calculation method and operation optimization of water supply and distribution systems equipped with water wells In the paper, there has been proposed a method of hydraulic and feasibility studies for water systems equipped with water wells which allows determining the optimal set of system structures and the most efficient regimes of their joint performance during operation. Some of the most difficult for hydraulic and feasibility calculations are water supply and distribution systems (hereinafter - SPRV), which contain water wells with borehole pumps. When designing new systems, setting up newly built ones and reconstructing the existing systems, it is necessary to choose the optimal set of structures, their optimal sizes and the most efficient regime of their joint performance. Currently, such systems are the most common for the underground water intake, and the complexity of the optimization calculations of their interacting structures joint performance, is accounted for with the need to specify the characteristics of all wells, their mutual interdependence, and the changes of their characteristics during operation. 10.5862/MCE.46.7 water supply and distribution systems efficient use of resources hydraulic resistance head loss specific energy consumption https://engstroy.spbstu.ru/article/2014.46.7/ 07.pdf