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Документ The performance of plastic solar collector as part of two contours solar unit(2018) Selikhov, Yu. A.; Kotsarenko, V. A.; Klemes, J. J.; Kapustenko, P. O.The use of solar collectors made of polymeric materials allows absorbing solar radiation most fully and reduce the material consumption of the solar installations. The results of experiments with flat plate solar collector with absorber made of special grade polyethylene are presented. The obtained correlations for dependences of the coefficient of efficiency and the specific heat flux from the flow rate of the heat carrier, the heat carrier temperature at the exit from the solar collector, the operating time of the solar installation during the daylight at different coolant flow rates can be used for reliable design of solar heating systems and for integration of plastic solar panels into heating systems in industry and communal sector.Документ The correlation of experimental results for condensation of steam from its mixture with air in channel of plate heat exchanger based on mathematical modelling(Національний університет "Львівська політехніка", 2019) Kapustenko, P. O.; Tovazhnyanskyy, Leonid Leonidovich ; Arsenyeva, O. P.; Vasilenko, O. A.; Kusakov, S. K.The process of steam condensation in the presence of air in channels of plate heat exchanger is investigated experimentall and with mathematical modelling. The equation accounting for transvers mass flux on heat and mass transfer is obtained. The results allow design of platecondenserss for steam containing noncodensable gas.Документ Eco-Friendly Synergetic Processes of Municipal Solid Waste Polymer Utilization(The Italian Association of Chemical Engineering, 2018) Bukhkalo, S. I.; Klemeš, Jiří Jaromír; Tovazhnyanskyy, Leonid Leonidovich ; Arsenyeva, O. P.; Kapustenko, P. O.; Perevertaylenko, O. Yu.The synergetic approach for eco-friendly efficient utilization of Polymer Solid Waste is presented. It is accounting for chemical processes in polymers during the use of the original product and at the stage of its waste recycling. The study of the polymer photoconductive degradation based on analysis of chemical reactions in the polymer film is presented. It is discussed how to predict the properties of the polymer after its use and to develop the efficient technique for its recycling. The recycling technique is demonstrated on examples of recycling polyethylene film by chemical foaming and injection moulding methods. The results of factorial experiments on the influence of different process parameters on process intensity and secondary product quality are presented. The results are used for developing modern technologies for the processing of polymer solid wastes into useful secondary products.Документ The estimation of heat transfer area of pillow-plate heat exchangers for water heating(NTU "KhPI", 2017) Arsenyeva, O. P.; Kapustenko, P. O.; Vasilenko, O. A.; Tran, J. M.; Kenig, E. Y.Efficient heat recuperation is of primary importance in resolving the problem of efficient energy usage and consequent reduction of fuel consumption and greenhouse gas emissions. To solve this problem, different strategies can be used, but all the approaches need efficient heat transfer equipment. One of the innovative types of heat transfer equipment is the Pillow-Plate Heat Exchangers (PPHEs). The present paper gives the information about the main manufacturers of PPHEs, describes the existing approaches for determining the pressure drop and heat transfer. The application of the PPHE for water heating is considered, and the resulted heat transfer area is compared with the surface of chevron-type plate heat exchanger designed for the same process conditions.Документ The Mathematical Modelling of Fouling Formation Along PHE Heat Transfer Surface(The Italian Association of Chemical Engineering, 2017) Kapustenko, P. O.; Arsenyeva, O. P.; Matsegora, O. I.; Kusakov, S. K.; Tovazhnianskyi, V. I.The phenomena of fouling can significantly deteriorate the intensity of heat transfer process and influence heat exchanger performance. The correct account for fouling is especially important in PHE with much higher heat transfer coefficients than in tubular heat exchangers. The mathematical model of heat transfer in PHE subjected to fouling is proposed. The model is represented by the system of partial differential equations which integration permit to estimate local parameters of heat exchanging streams and developing in time local values of fouling depositions layer thickness. The fouling rate is determined with the use of fouling deposition model proposed earlier. The model is validated by comparison with the data obtained for PHE working in industry and can be used for more accurate calculation of PHE heat transfer area in conditions of fouling formation than methods relying on averaged process haracteristics. The model application is illustrated by two case studies for PHE application in sugar industry and in District Heating system.Документ Mathematical Model of Heavy Duty Welded Plate Heat Exchanger and its Validation in Industry(The Italian Association of Chemical Engineering, 2017) Tovazhnyanskyy, Leonid Leonidovich ; Kapustenko, P. O.; Perevertaylenko, O. Yu.; Arsenyeva, O. P.; Arsenyev, P. Y.; Khusanov, A. E.Plate Heat Exchanger (PHE) is one of the modern types of compact heat transfer equipment, which can significantly enhance the heat recuperation and improve efficiency of energy usage in many industrial applications. The construction of welded PHE (WPHE) is significantly widening the range of its application on temperature and pressure. The construction of investigated WPHE is developed for work in high pressure shell of ammonia synthesis column at pressure up to 32 MPa and temperature up to 520 °C. It consists of the stack of round corrugated plates with diameter 626 mm, which are welded together to form a number of channels for cold and hot streams exchanging heat. The welded collectors of special design are organizing multi pass movement of both streams with overall counter flow. The movement of two streams in one pass block is cross flow with overall counter flow in a whole WPHE. The mathematical model of considered WPHE is developed, which enables to perform the thermal and hydraulic design for specified process conditions and also rating calculations of WPHE with determined parameters of its construction. The validity of the proposed Equations and developed mathematical model is confirmed by comparison with the data of tests on WPHE installed in ammonia synthesis column at industrial enterprise of ammonia production. WPHE was operating in existing synthesis column of ammonia unit instead shell-and-tube heat exchanger. The construction of WPHE and the results of the tests are discussed. The use of WPHE instead shell-and-tube unit enable to cut down the volume occupied by heat exchanger in high pressure shell of ammonia synthesis column and allows increase of the volume of catalyst. It leads to 15 % rise of ammonia output.Документ The Longitudinal Flow of Oil and Petroleum Products in the Channels and Pipes. Part II(The Italian Association of Chemical Engineering, 2017) Tolchinsky, Yu. A.; Tovazhnyanskyy, Leonid Leonidovich ; Ved, V. E.; Kapustenko, P. O.; Krasnokutskiy, E. V.; Ved, H. V.; Satayev, M. I.; Saipov, A. A.A model associated fluid flow and heat transfer of longitudinal flows of oil in pipes and channels is considered. The model is an extended version of the Bingham flow on the case of flow with one or two solid cores. The fluid part is a two-phase medium, wherein the disperse phase may consist of solid particles, droplets and gas bubbles. The sliding on the borders of pipes and channels, thermal conductivity and viscosity of such systems and their impact on the characteristics of the solid core are discussed. The flow with a yield point dependence on the temperature is also considered.Документ Optimal design of plate-and-frame heat exchangers for efficient heat recovery in process industries(Elsevier Inc., 2011) Arsenyeva, O. P.; Tovazhnyansky, L. L.; Kapustenko, P. O.; Khavin, G. L.The developments in design theory of plate heat exchangers, as a tool to increase heat recovery and efficiency of energy usage, are discussed. The optimal design of a multi-pass plate-and-frame heat exchanger with mixed grouping of plates is considered. The optimizing variables include the number of passes for both streams, the numbers of plates with different corrugation geometries in each pass, and the plate type and size. To estimate the value of the objective function in a space of optimizing variables the mathematical model of a plate heat exchanger is developed. To account for the multi-pass arrangement, the heat exchanger is presented as a number of plate packs with co- and counter-current directions of streams, for which the system of algebraic equations in matrix form is readily obtainable. To account for the thermal and hydraulic performance of channels between plates with different geometrical forms of corrugations, the exponents and coefficients in formulas to calculate the heat transfer coefficients and friction factors are used as model parameters. These parameters are reported for a number of industrially manufactured plates. The described approach is implemented in software for plate heat exchangers calculation.Документ Process integration of sodium hypophosphite production(Elsevier Inc., 2010) Tovazhnyansky, L. L.; Kapustenko, P. O.; Ulyev, L. M.; Boldyryev, S.; Arsenyeva, O. P.The case study of flexible integrated flowsheet development for sodium hypophosphite production is presented. It is based on phosphoric sludge utilization process. The weight concentration of phosphorous in raw materials is equal to 30e50%. The reaction and separation parts of the system were designed based on detailed analysis of production stages. After that the process equipment was selected. Process modelling is made for annual production of hypophosphite equal to 2500 t. It permitted to extract process streams for heat energy integration and to define their parameters. The operating pinch procedure was used to estimate the consumption of hot and cold utilities for non-integrated process. The influence of utilities cost on minimal temperature difference is investigated. Analysis of heat system topology modification depending on energy prices is conducted. Optimal structure of heat recovery system and minimal temperature difference are determined. It is shown that optimal integrated process consumes 45% of hot and 30% of cold utilities required by non-integrated process.Документ Computer Aided Design of Plate Heat Exchangers(Elsevier Inc., 2010) Arsenyeva, O. P.; Tovazhnyansky, L. L.; Kapustenko, P. O.; Khavin, G. L.The computer aided design of plate heat exchanger with mixed grouping of plates is considered. It is formulated as the mathematical problem of finding the minimal value for implicit nonlinear discrete/continues objective function with inequality constraints. The optimizing variables include the number of passes for both streams, the numbers of plates with different corrugation geometries in each pass, the plate type and its size. To estimate the value of objective function in a space of optimizing variables the mathematical model of plate heat exchanger is developed. To account for thermal and hydraulic performance of channels between plates with different geometrical forms of corrugations, the exponents and coefficients in formulas for heat transfer coefficients and friction factors calculation are used as model parameters. The procedure and software for numerical experiment to identify model parameters by comparing the calculation results with those obtained with free available in web computer programs of plate manufacturers is developed. The sets of such parameters are obtained for a number of industrially manufactured plates. The described approach is implemented as software for plate heat exchangers calculation.