Bulletin of Prydniprovs'ka State Academy of Civil Engeneering and Architecture

9-13

Authors: D. Zezyukov

While implementation of calculations, designers use the certain rules of application, that are the generally accepted methods. There must be possibly the use of the simplified design techniques in this case, if it is possible to prove that they are confronted to corresponding principles and provide the degree of safety and durability not less, than methodologies offered by operating normative documents. Eurocode on the basis of which DBN V.2.6–98:2009 was made, allows to use considerable part of methodologies from the normative documents operating on the territory of former post–soviet territory, as their basic principles correspond largely. During the use of any alternative methodology it is already impossible to consider, that planning is executed in complete accordance with DBN V.2.6–98:2009, however regulative organizations, during realization of calculations, usually use the simplified methodology of the former, tested, normative documents. By comparison of maximum moments in the cut of reinforce–concrete element in the zone of clear bend, which were received with the help of using of methodologies of calculation which were used in some normative documents, it is necessary to educe differences between application of national normative document of DBN V.2.6–98:2009 with possibility of the use of the simplified methodologies on the stage of the previous planning. Marked in DBN V.2.6–98:2009 the calculation of the normal crossing of reinforce–concrete elements according to the deformation method is not difficult, but needs a lot of time for the decision of simple tasks. Comparatively with the operating norms of Russia, Belarus and European Union, the result of determination of bearing strength of the normal crossing does not exceed 5 % toward the reduction of maximum values, while the same difference between the cancelled norms of SNiP 2.03.01–84* is 2 %. Coming from the obtained data, for implementation of approximate calculations on the stage of the previous planning, it is enough to take advantage of easy and tested methodology, with further clarification of results at the detailed calculations.

17-22

Authors: F. O. Korsun

Problem. In case high pressure heat exchanger is replaced by hydrodistributor the question of its running arises. The article proposes the method of hydrodistributor running proposed for utilization in the mine air conditioning system. Literature review. Research workers of the Prydniprovs’ka State Academy of Civil Engineering and Architecture possess more than 20 author’s patents issued by the state ofUkraine for hydrodistributors. However, this article proposes a more updated hydrodistributor functioning without hydraulic impacts in normal conditions. Aim. The article proposes the method of a device (hydrodistributor) operating without hydraulic impacts in air conditioning systems. The investigation of hydraulic impact using electric model showed that hydraulic impacts that occur as a result of switching fluid currents in hydrodistributor can be technically controlled. In order to perform such control it is necessary to select hydraulic distributor that would allow to perform slow valve lock which would result in weak hydraulic impacts or would prevent them from occurrence. Rubber [2] membranes should be replaced with movable insulating diaphragm whereas sealed tanks should be replaced with rather long pipelines with the amount of pipes increased up to six. Operating schedule of this device is given in Picture 1. Pressure increase during hydraulic impact depends on the type of valve resistance fluctuation and is an effective tool used to soften hydraulic impact that depends on the selection of such valve closure time where the pressure does not exceed the acceptable level. The less the speed loss in the pipeline is, the smaller the pressure increase will be. The lower the speed of valve closure is, in other words, the shorter impact T phase is comparing to the time of full closure of the valve t3, the less the change in the valve closure degree would be according to Δα / D = T / t3 during each Δα / D phase. To ensure ongoing operation of the system during cold bearer supply it is proposed to accept a minimum amount of 6 tanks, three of which will function as a cold bearer supplier supplied to the processed horizon and the other three will return defrosted cold bearer to refrigerating machine (Picture 1b). In [1] with the coefficient of local valve resistance ξ =0,46 full closure of the valve is performed within 15 sec. With water velocity that equals to 1meter per second head loss in the valve are calculated to be 0,025 m. Insulating membrane covers the distance equal to the length of sealed tank one way per minute. Opening of the valve is performed within 15 seconds, closure will be performed within 15 seconds and the work for the fully closed valve will be performed within 30 seconds — the period will be 1 minute. Reliability of the elements combination that the present system represents is determined depending on the reliability of each its element taking into consideration their effect on the system operation. Reliability of the system depends on its elements, their role and the type of reciprocal junction. Conclusion. 1. The economy of heat during the application of the proposed hydraulic distributor in the system of cold bearer of mine air conditioning system distribution will make approximately 30–40 %. 2. With the application of proposed hydraulic distributor in the mine air conditioning system the technical effect lies in the fact that hydraulic impacts are eliminated, mine air conditioning system becomes simplified and more reliable. 3. In the process of choosing hydraulic distributor, its design and structure, the calculation of its performance reliability, graph illustrating conjugation of tanks functioning during liquid distribution (see Pic.1) was performed as well as utilization of total six tanks was decided. Three of them will accept cold bearer from the refrigerator situated at mine’s surface and the other three supply it to cooling in the bottomhole directly to air–cooling units. The system will function without hydraulic impacts. 4. In case high pressure heat exchanger is replaced by hydraulic distributor, total electricity economy according to the given costs will be more than UAH 1,5 million per year for one mine with the utilization of one air–cooling unit.

30-35

Authors: V. Uzhelovs'kyy, V. Hlinkin

Problem statement. To improve the indoor climate control system, you must have an adequate mathematical model of the building. For this purpose, a mathematical description of its running parameters. Analyzing of the resent research. In the works of contemporary experts in climate control facilities already had a steady and qualitative representation on the management of temperature and humidity. In particular, E. Sazonov argues that in the process automation indoor environment plays a crucial role to create an adequate mathematical model. That is correct mathematical model in conjunction with elements of automation systems, to a large extent, determine the quality of the control parameters of microclimate Research objective. Development of mathematical model indoor environment, to ensure a comfortable environment and economic modes of operation. Conclusions. 1. Mathematical model is specially designed for thermal analysis of buildings. 2. Mathematical model allows to efficiently calculate the temperature and humidity inside the room, taking into account the heat loss through the building envelope (walls, windows, ceiling, floor, roof). 3. Mathematical model can be the basis of a thermal model of the building, through which can be carried out appropriate calculations. With a thermal model becomes possible to develop intellectual climate control system in buildings.

39-44

Authors: N. Shapa, A. Loban'

Urgency of the problem. Companies are increasingly using modern technology in their management activities. These technologies are largely relates internet. The Internet is evolving, and every year there are more users, their activity increases. The Internet has become a part of the life of society as a whole, because in the right hands turns into an effective tool for marketing activities. This tool to control, and using it to expand the boundaries of the enterprise. Moreover, given the fact that the global use of the Internet in today's world and business, the issue of using internet marketing (IM) is no longer just a factor of competitive advantage, but also the survival of the enterprise as a whole. Analysis of publications. The use of internet marketing activities of modern enterprises devoted to scientific work of scholars such as: I. Ashmanov, Basov, F. Virin, A. Ivanov, Alan Cooper, Jerry Ledford, Mary Tyler, V. Kholmogorov et al. However, some issues associated with the influence of specific tools for the development of MI activity of the enterprises studied is not sufficient and requires a more in–depth consideration. The purpose of the article — to characterize and classify the constituent elements of the marketing activities carried out with the help of Internet technologies and their potential for the development of modern Ukrainian enterprises. Conclusions. In this article were reviewed and classified the main components of online marketing: market research, creation and use of the site; use to disseminate advertising information social networking and viral marketing; an overview of the existing IT–technologies in the field of marketing, they offer the most profitable opportunities in terms of practical application in business.