Heat Supply Modes Optimization Based on Macromodeling Technology

Filimonova, A. A.; Barbasova, T. A.; Shnayder, Dmitry A.; Basalaev, Aleksandr A.

doi:10.1016/j.egypro.2017.03.233

Cited by 4 publications

(4 citation statements)

References 8 publications

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“…To take into account the network specificity of the problems of calculating the thermalhydraulic HSS modes [1,9], the graph theory is used as a visual and effective section of mathematics from the point of view of algorithmization and software implementation. The basic methods for calculating hydraulic regimes are the general methods for calculating the flow distribution: the method of nodal pressures [12], the contour flow method [1], the global gradient method [13], and other methods [14][15][16][17][18].…”

Section: Methodsmentioning

confidence: 99%

The method of adjustment of heat supply systems with the multistage temperature control at pumping stations

Tokarev

Novitsky

2018

MATEC Web Conf.

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The lowering of the temperature graph in the lower-level heat networks is often carried out by a mixture of coolant from the return pipeline at mixing pumping stations in order to maintain the set temperature of the mixed water. In this case, part of the heat carrier is not returned to the source of thermal energy, but it circulates in the circuits from the mixing station to the lower consumption nodes. The presence of such circulation flows leads to the absence of a stabilizing moment of the temperature field when it is calculated by traditional methods, as well as to the “looping” of the computational process and the impossibility of obtaining a solution. In work to overcome these problems, a new computational scheme for commissioning calculation is proposed, which is based on: (a) decomposing the calculation of the thermal-hydraulic regime into calculations of the hydraulic and temperature conditions; (b) using the conditional regulator of the ratio of the mixing station’s output costs in calculating the hydraulic regime; (c) fixing the temperature at the station’s output when calculating the temperature regime; (d) iterative calculation with correction of the setpoint of the ratio controller of the flow rate based on the calculation of the temperature regime.

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Section: Methodsmentioning

confidence: 99%

The method of adjustment of heat supply systems with the multistage temperature control at pumping stations

Tokarev

Novitsky

2018

MATEC Web Conf.

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“…(1) Problems with statistical or dynamic technological criteria (optimization of the basic parameters of the boiler unit [2], temperature control [3], maximum efficiency of combustion processes [4,5], changes in design parameters [6], etc. ); (2) Problems with statistical or dynamic technical and economic criteria (energy-saving of thermal energy [7], minimization of operating costs [8], maximum profit [9], etc. ); (3) Forecasting problems for the technical state of heat and power equipment (shortterm and long-term forecasts of the mode parameters [10,11], planning of repair and maintenance work, development of a strategy for equipment service [12], etc.…”

Section: Introductionmentioning

confidence: 99%

“…from the necessary and sufficient conditions for the solvability of the three-dimensional Volterra integral equation of the first kind with variable upper and lower integration limits arising in the problem of identifying K iii from Equation (7). Let us further, for simplicity, present α 1,i = −α 2,i ≡ α i .…”

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confidence: 99%

“…In the case of vector input signals, in particular, for x(t) = (x 1 (t), x 2 (t)) T , the righthand side of Equation (1), in contrast to Equations ( 6) and (7), includes integral terms that take into account the contribution of nonsymmetric kernels K 12 , K 112 , and K 122 . From the fulfillment of the conditions of the theorems on the existence of these kernels in the required classes of functions [36], constraints of the form 8)-( 11) at the stage of planning an experiment on a set of responses of a dynamic system, represented by a simulation model Equation ( 3), to inputs of the form Equation ( 5) will influence on the accuracy of constructing Equations ( 1) and ( 4) (12) and N = 3…”

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confidence: 99%

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Integral Equations Related to Volterra Series and Inverse Problems: Elements of Theory and Applications in Heat Power Engineering

Solodusha

Bulatov

2021

Mathematics

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The paper considers two types of Volterra integral equations of the first kind, arising in the study of inverse problems of the dynamics of controlled heat power systems. The main focus of the work is aimed at studying the specifics of the classes of Volterra equations of the first kind that arise when describing nonlinear dynamics using the apparatus of Volterra integro-power series. The subject area of the research is represented by a simulation model of a heat exchange unit element, which describes the change in enthalpy with arbitrary changes in fluid flow and heat supply. The numerical results of solving the problem of identification of transient characteristics are presented. They illustrate the fundamental importance of practical recommendations based on sufficient conditions for the solvability of linear multidimensional Volterra equations of the first kind. A new class of nonlinear systems of integro-algebraic equations of the first kind, related to the problem of automatic control of technical objects with vector inputs and outputs, is distinguished. For such systems, sufficient conditions are given for the existence of a unique, sufficiently smooth solution. A review of the literature on these problem types is given.

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