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Introduction
Publications
Publications (52)
This article focuses on the challenges of modeling energy supply systems for buildings, encompassing both methods and tools for simulating thermal regimes and engineering systems within buildings. Enhancing the comfort of living or working in buildings often necessitates increased consumption of energy and material, such as for thermal upgrades, wh...
This paper aims to reconsider prosumers' role in the power markets in the early stages of their decentralization, accounting for rising self-supply trends, security threats, and economic and regulatory barriers. The development of prosumerism envisages finding the ratio between retail market sales under the feed-in tariff and the net billing mechan...
Exergy-based methods provide engineers with the best information with respect to options for improving the overall thermodynamic efficiency of an energy conversion system. This paper presents the results of an advanced exergy analysis of an air-to-water reversible heat pump whose performance was analyzed with respect to different working fluids. En...
The paper presents a new method aimed at the simultaneous thermodynamic and economic enhancement of air-source and water-source heat pumps. The novel approach allows estimating the avoidable parts of the exergy destruction and investment expenditures by avoiding the need for ideal process introduction, being the most critical issue associated with...
Avoidable endogenous/exogenous parts of the exergy destruction in the components of an energy conversion system can be computed by applying advanced exergy analysis. Their calculation is crucial for the correct assessment of the real thermodynamic enhancement achievable by the investigated energy conversion system. This work proposes a new approach...
The work presents the results of exergetic analysis of a reversible chiller providing both cooling and space heating in varying operational modes. The year values of avoidable parts of exergy destruction occurring in each system component are used for the analysis. The outcomes obtained showed that the both inside and outside heat exchangers have t...
Estimation of avoidable endogenous/exogenous parts of exergy destruction in the components of an energy conversion system is provided within the methodology of advanced exergy-based analysis. According to this methodology the unavoidable, endogenous and unavoidable endogenous parts of the exergy destruction are calculated assuming special operating...
The most widespread approaches to the study of thermal systems involve the iterative implementation of the following steps: thermodynamics, heat and mass transfer, hydrodynamics, economics and ecology. Such methodology cannot combine economic, environmental and thermodynamic aspects from the beginning of the analysis. It does not provide informatio...
The advanced exergy method provides engineers with the best information with respect to options for improving the overall thermodynamic efficiency of an energy conversion system. This paper presents the results of the advanced exergy analysis of an air source heat pump to perform a comparison involving different working fluids, i.e.R410A, R134a and...
The paper presents energy and exergy analysis of a typical dwelling ventilation system with heat recovery for Ukrainian climatic conditions using a quasi-steady state approach over 24-hour time-steps. Evaluation of such systems on the base of the first law of thermodynamics demonstrates that heat recovery is beneficial for the whole variety of oper...
Heat pump technologies for space heating can contribute to substantial economic, environmental and energy saving benefits. However, their performance is generally evaluated through energy-based methods.
The distinguish feature of the exergy-based approaches is that, unlike to the energy-based ones, they are more powerful and convenient tools for de...
The application of the exergy approach to thermal comfort models is a modern tool for providing and evaluating the level of thermal comfort. The purpose of the paper is to apply exergy analysis to the “heat source - human - building envelope” system to reduce energy consumption and to identify the most influential factors. The regression models for...
The work demonstrates the results of application of the detailed advanced exergetic analysis to air-source, watersource and wastewater-source heat pumps providing space heating in the built environment. Cumulative values based on seasonal exergy destruction are used for deriving conclusions. It is shown that in the specified conditions of the inves...
On the base of exergy-based approach it is shownthat for the ventilation systems there are operating modes forwhich heat recovery increases exergy of fuel expended to providethe ventilation air compared to cases without bringing anyrecovery of heat and additional power consumption to drive theair flow by the fans. For the specified system, in case...
In addition to conventional exergoeconomic evaluation, advanced exergoeconomic analysis provides information about at what rate the inefficiencies and costs can be avoided through technological improvements of the system and components, and in which proportion the inefficiencies and costs are resulted from interactions among components. The objecti...
Heat pump technologies for space heating play a crucial role in fight against climate change. However, their performance is generally evaluated through energy-based methods.
The distinguish feature of the exergy-based approaches is that unlike to the energy-based ones they are more powerful and convenient tools for investigation and improvement of...
A generalized spatial mathematical model of the multicomponent pollutant removal for a liquid treatment is proposed. Under the assumption of domination of convective processes over diffusive ones, the model considers an inverse influence of the determining factor (pollution concentration in water and sludge) on the media characteristics (porosity,...
In this paper, a mathematical model is presented for wastewater biological treatment of multicomponent pollutants. The proposed model includes a simulation of the wastewater clarification in the clarifier; simulation of the wastewater aerobic treatment in the porous medium; numerical-asymptotic approximation for solutions of spatial model problems...
In contrast to conventional exergy-based methods, advanced exergetic analyses can evaluate exergy destructions due to interactions among
components of the energy-conversion system and the real potential for improving system components. Application of the advanced exergetic analysis to a wastewater source heat pump with wastewater heat exchanger pro...
У монографії наведені експериментально-теоретичні дослідження процесів очищення стічних вод від біогенних елементів. Запропоновані методики розрахунку систем очищення стічних вод. Розглянуті технології утилізації енергії стічних вод теплонасосними установками.
In addition to conventional exergy-based methods, advanced exergetic analyses consider the interactions among components of the energy-conversion system and the real potential for improving each system component. The paper demonstrates the results of application of a detailed advanced exergetic analysis to a wastewater source heat pump providing sp...
In contrast to conventional exergy-based methods, advanced exergetic analyses can evaluate exergy destruc-tions due to interactions among components of the energy-conversion system and the real potential for improving system components. Application of a detailed advanced exergetic analysis on a wastewater source heat pump providing space heat-ing i...
For further development of the dynamic exergy analysis within built environment the work proposes to take into account stochastic nature of variations of operational regimes. Using the probability theory and statistics methods, the set of parameters considered as relevant for uncertainty conditions are presented. It is shown that characteristics of...
This book provides the fundamentals of the application of mathematical methods, modern computational tools (Excel, Mathcad, SMath, etc.), and the Internet to solve the typical problems of heat and mass transfer, thermodynamics, fluid dynamics, energy conservation and energy efficiency. Chapters cover the technology for creating and using databases...
For further development of the dynamic exergy analysis within built environment the work proposes to take into account stochastic nature of variations of operational regimes. Using the probability theory and statistics methods, the set of parameters considered as relevant for uncertainty conditions are presented. It is shown that characteristics of...
Computer simulation is one of a powerful technique for designing, optimizing and analyzing processes in air-conditioning and refrigerating systems.
In order to use this tool special software which enables to calculate thermophysical properties of working fluids is required. To solve problems for
simulating air-conditioning and refrigerating process...
This chapter describes how you can build contour lines (isobars, isotherms and isochores) and lines of phase transitions on the state diagrams of water and steam.
In the chapter a description is given for thermodynamic cycles calculations approaches used in refrigeration, air-conditioning facilities, heat pumps. Given the characteristics of cloud-based functions that support these calculations.
This chapter describes approaches to calculate the thermal efficiency of a binary power cycle consisting gas and steam turbines. Links to authors’ web sites with calculations such binary cycles of different types are provided.
This chapter shows how to create functions that return the values of the thermophysical properties of working fluids of power engineering, on the basis of tabular values in different areas of the state: single-phase region, two phase region, the saturation line.
This chapter describes in detail the process of calculating energy characteristics of the gas turbine cycle (Brayton cycle) with modeling of the composition and thermophysical properties of air, natural gas and products of combustion along the flow in gas turbine.
You will learn how to create a function that returns thermophysical properties of working fluids, heat transfer and energy materials using interpolation and smoothing. You will also learn what a cloud function for the thermal calculations is.
A preliminary assessment of the possibilities of utilizing domestic used water as a low-temperature source for a heat pump is made in the paper. Based on energy balance and heat transfer equations and analysis of thermodynamic cycle of the heat pump it is shown that in case of domestic usage this source can be regarded mostly as an opportunity to i...
The paper based on theoretical research developed the concept of complex technologies for wastewater treatment and use of sewage heat from civilian objects Estimation of small wastewater treatment. Keywords: wastewater treatment, complex technology, heat waste water.
Based on exergic approach the paper provides the necessity of improving methodological framework to assist decision making processes when using wastewater as a heat source in heating systems. This framework complements the existing concept of development of the next 4th generation district heating
Keywords: exergy-based approach, heating systems, w...
A preliminary assessment of the possibilities of utilizing domestic used water as a low-temperature source for a heat pump is made in the paper. Based on energy balance and heat transfer equations and analysis of thermodynamic cycle of the heat pump it is shown that in case of domestic usage this source can be regarded mostly as an opportunity to i...
On the base of mathematical simulation, with the use of Mathcad Calculation Server technology the examples of investigations of some cycles of heat pumps are given in the work.
On the base of mathematical modelling, with the use of the Mathcad Calculation Server technology the examples of investigations of some cycles of gas and gas-steam turbine power plant are given in the work. It is shown, that, on the whole, except for existent methods (increasing gas turbine inlet temperature, optimization of steam turbine inlet par...
Information is provided regarding a website where calculations of thermodynamic cycles can be carried out in an interactive mode.