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TECHNICAL UNIVERSITY - SOFIA: Recent submissions

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Title: On the structure of a heated three - dimensional jet Author: Lozanova, Milena; Лозанова, Милена Date: 1995 Abstract: Three-dimensional jets are widely used in verious technological processes. In this paper the flow field of heated jet with aspect ratio A= a/b = 3 is investigated at several initial conditions. The various characteristics of the velocity and the temperature fields are obtained. The velocity and thermal half-widths in the two principal ... Library:
TECHNICAL UNIVERSITY - SOFIA
Title: Статистически анализ на климатични данни и обобщени температурни криви за гр. Пловдив Author: Банов, Ивайло Петков; Banov, Ivailo Petkov Date: 1995 Abstract: The paper presents the results of the statistical analysis of the climatic conditions for 30-year period of time for the town of Plovdiv. There is found the generalized temperature curve for a period of a sudden spell of cold weather in the report. In tabular form are given the initial temperature - t..., the amplitude of variation of the ... Library:
TECHNICAL UNIVERSITY - SOFIA
Title: Система с непрекъснато действие за аварийно подхранване на парогенераторите за реактора тип ВВЕР Author: Глухов, Георги Анастасов; Попов, Емилиян Любомиров; Gluhov, Georgi Anastasov; Popov, Emiliyan Lyubomirov Date: 1995 Abstract: A possible steam injector application for improving of emergency feedwater supply Is discussed in the article. Two cases of injector implementation in the K-220-44 turbine flow diagram are analyzed. An estimation is made for the influence of injector steam consumption on the thermal performance of the turbine facility as a whole. Library:
TECHNICAL UNIVERSITY - SOFIA
Title: Относно дебелината на топлинната изолация при канално полагане на топлопреносни мрежи Author: Геновски, Иван Кирилов; Genovski, Ivan Kirilov; Шушулов, Константин Найденов; Shushulov, Konstantin Naydenov Date: 1995 Abstract: It is necessary to change thicknesses of insulations due to the dynamic of the main components' prizes, influenced them. This investigation concerning new evaluation of thicknesses of insulation of the district heating mains (channel laid) according to the new conditions of market economy. Library:
TECHNICAL UNIVERSITY - SOFIA
Title: Numerical prediction of comfort and ventilation efficiency in ventilated rooms Author: Denev, Yordan A.; Денев, Йордан А.; Stankov, Petar; Станков, Петър Date: 1995 Abstract: The paper presents investigation of comfort and ventilation efficiency in a typically chemical laboratory room with two fume cupboards. The investigation is based on the detailed results obtained from the numerical solution of a system of seven partial differential equations on a numerical grid of 245000 points. The assessment of comfort ... Library:
TECHNICAL UNIVERSITY - SOFIA
Title: Моделиране на товаровия график на битови електропотребители Author: Николов, Димитър Александров; Nikolov, Dimitar Alexandrov Date: 1995 Abstract: The rational design of the electrical supplying systems in the populated areas requires exact normative values of the calculated loads. The experimental determination of these loads is quite difficult, because of the great volume of labour consuming measurements. In order to make easier these measurements it was suggested a method for ... Library:
TECHNICAL UNIVERSITY - SOFIA
Title: Изследване на нетрадиционни режими на пускорегулираща апаратура за луминесцентни лампи Author: Джагаров, Николай; Dzhagarov, Nikolay; Пенчев, Пенчо; Penchev, Pencho Date: 1995 Abstract: Широко се внедрява високочестотна пуско-регулираща апаратура (ПРА) за луминисцентни лампи, осигуряваща по-добри качествени показатели като увеличено светлоотдаване, надеждна работа и други технико-икономически показатели. С повишаване на честотата процесите в лампите и ПРА се изменят значително, като особено значение придобиват нетрадиционните ... Library:
TECHNICAL UNIVERSITY - SOFIA
Title: Детерминирани показатели за надежност при топлоснабдителни системи Author: Шушулов, Константин Найденов; Геновски, Иван Кирилов; Shushulov, Konstantin Naydenov; Genovski, Ivan Kirilov Date: 1995 Abstract: District heating systems are characterised with certain rate of reliability. It should, be possible to influence this reliability by means of technical and economical impacts. To estimate the technical conditions of the consumers, there are strong characteristics which are not influenced from the probable character of the reliable factor. ... Library:
TECHNICAL UNIVERSITY - SOFIA
Title: Формализация на управляваща повърхнина от размити управляващи правила Author: Станчев, Валентин Георгиев; Stanchev, Valentin Georgiev Date: 1995 Abstract: The control surface represents a mode for presentation of fuzzy control algorithm. The advantage taken of using that mode consists of the following: the operations "fitzzyfication", "control strategy" and "defitzzyfication" are combined and not executed separately, i.e. for each observation of input data the result of surface interpolation ... Library:
TECHNICAL UNIVERSITY - SOFIA
Title: Алгоритмизация на управлението чрез апарата на размитите множества Author: Станчев, Валентин Георгиев; Григоров, Александър Данчев; Stanchev, Valentin Georgiev; Grigorov, Alexandar Danchev Date: 1995 Abstract: In this paper, a basic approaches and stages in building of a fizzy control system by means of algorithmization of control signals using fizz)) see, are considered. The described stages during the fuzzy control algorithm synthesis are quantitatively determined for industrial boiler KM-12, along the channel "fuel pressure". Library:
TECHNICAL UNIVERSITY - SOFIA
Title: Дългосрочни климатични характеристики за проектиране и анализ на пасивни слънчеви системи в Сирия Author: Фарес, Амине; Fares, Amine Date: 1995 Abstract: For the design and evaluation of the effectiveness of passive systems it is necessary to know the long-term characteristics of the main climatic factors which also determine the basic input energy flow. A data base for a 25 year period for five representative areas in Syria has been analyzed and the substantial long -term characteristics ... Library:
TECHNICAL UNIVERSITY - SOFIA
Title: Прибор за непрекъснато измерване влагосъдържанието на пряснята пара в АЕЦ Author: Иванов, Георги Рампов; Ivanov, Georgi Rampov Date: 1995 Abstract: In the article are described the basic requirements, used for the design of a real microprocessor-based device for continuous fresh steam wetness fraction measurement in a nuclear power plant with saturated steam turbines. The throttling calorimeter has been chosen, as the most accurate and applicable for the Nuclear Power Plant (NPP) ... Library:
TECHNICAL UNIVERSITY - SOFIA
Title: Влияние на началното влагосъдържание на парата върху ефективността на турбина К 220-44 Author: Иванов, Георги Рампов; Маринов, Марин Александров; Ivanov, Georgi Rampov; Marinov, Marin Alexandrov Date: 1995 Abstract: By means of a computer software, an investigation was made for the influence of the inlet steam wetness fraction on the power and turbine Efficiency of the high pressure stage of the saturated steam turbine type K.220-44 at different load levels. Due to the reheat after the high pressure stage, the influence of the inlet parameters is limited ... Library:
TECHNICAL UNIVERSITY - SOFIA
Title: Анализ на чувствителността на температурното поле в стена на тромб Author: Калоянов, Никола; Фарес, Амине; Fares, Amine; Kaloyanov, Nikola Date: 1995 Abstract: The modelling of heat transfer processes in an accumulating Trombe-Michel wall is connected inevitably with the character of the input energy flow. It is exceptionally dcult to obtain common mathematical description of the dynamic heat exchange process involving all the components of the input energy flow. In order to simplify the problem ... Library:
TECHNICAL UNIVERSITY - SOFIA
Title: Приложение на регулатори с променлива структура за управление на енергийни обекти Author: Каранешев, Светослав Ангелов; Ганев, Ивайло Гинев; Karaneshev, Svetoslav Angelov; Ganev, Ivailo Guinev Date: 1995 Abstract: A control structure is proposed, consisting of PID controller with variable structure and a block for independent compensation of the disturbances in the control loop. A comparison of the transient processes and amplitude, vs frequency characteristics of the proposed control structure and digital PI and PID controllers is made. Library:
TECHNICAL UNIVERSITY - SOFIA
Title: Технически средства за измерване на разход с гарантирани метрологични характеристики Author: Ганев, Ивайло Гинев; Каранешев, Светослав Ангелов; Начев, Георги Начев; Ganev, Ivailo Ginev; Karaneshev, Svetoslav Angelov; Nachev, Georgi Nachev Date: 1995 Abstract: Aproaches to minimise the systematic and additional errors when measuring flow with Ventoury type trans:niter are discussed. An evaluation of the influencing factors and the incertainty limits of the apriori information is made. A conclusion is made regarding the possibility to design intelligent flowmeters with improved metrological characteristics. Library:
TECHNICAL UNIVERSITY - SOFIA
Title: Динамични свойства на пламъчно - тръбни котли Author: Григоров, Александър Данчев; Grigorov, Alexandar Danchev Date: 1995 Abstract: In this paper on the basis of the power engineering approach, in analytical way, are obtained mathematical models, describing the dynamics of the flame-tube boilers that are manufactured and widely distributed in the notional decentralized power economy. There are included both the control and disturbances dynamical canals of steam and water ... Library:
TECHNICAL UNIVERSITY - SOFIA
Title: Annual energy consumption of air - conditioning systems Author: Stoichkov, Nikola Yordanov; Стоичков, Никола Йорданов; Димитров, Генко; Dimitrov, Genko Date: 1995 Abstract: An algorithm and software for air-conditioning systems annual energy consumption is carried out on the basis of hourly simulations. For external loads estimation the Test Reference Year for Sofia is used. The same room with constant internal loads was examined. Simulation models for systems with constant (CAV and variable (VAV) air volume ... Library:
TECHNICAL UNIVERSITY - SOFIA
Title: Test reference year for Sofia Author: Stoichkov, Nikola Yordanov; Стоичков, Никола Йорданов; Калоянов, Никола Георгиев; Димитров, Генко Иванов; Kaloyanov, Nikola Georgiev; Dimitrov, Genko Ivanov Date: 1995 Abstract: Test Refence Year (TRY) is it set of 8760 hourly coincident data for air temperature and relative humidity,, duration' sunshine, intensity of total solar radiation on horizontal surface, wind velocity and direction. TRY is used as a data base for simulating the performance of solar energy systems, building energy consumption and for indoor ... Library:
TECHNICAL UNIVERSITY - SOFIA
Title: Моделиране обтичането на крило с несвиваема вискозна среда Author: Савов, Владимир Светославов; Гешев, Диан Ненов; Savov, Vladimir Svetoslavov; Geshev, Dian Nenov Date: 1995 Abstract: Smooth flow around a wing of moderate aspect ratio and sweepback is simu-lated by the discrete vortex method assuming that the medium is inviscous and the wing is replaced with its middle surface. The effective wing section angle of attack is derived and using two-dimensional boundary layer with pressure gradient is calculated by the Polhausen ... Library:
TECHNICAL UNIVERSITY - SOFIA