Parametric identification of water heating systems for project management during operation

Authors

  • V. F. Irodov Dr. Sc. (Tech.), Prof., Ukraine
  • A. A. Chernoivan head of lab., ass., Ukraine

Keywords:

identification of hydraulic circuit, thermal mark, water heating system, flow meter, evolution algorithm, project management

Abstract

Abstract. Purpose. It is proposed to determine hydraulic parameters of water heating systems during operation to use identification of hydraulic circuit. The mathematical model of the hydraulic circuit is the model with concentrated parameters. The mane parameters of the hydraulic circuit are: flow rates at circuit jets, flow rates at circuit edges of the graph, pressure at circuit jets and difference pressure at circuit edges, hydraulic resistances of circuit edges. Identification of the hydraulic circuit is performed by the method of ―mathematical flowmeter‖. Methodology. There are measuring of some parameters of the circuit in the base of the method and comparison of calculated and experimental data. Experimental flow rates are determined by the mark method. Thermal mark is proposed for velocity marking at water heating systems. It is impossible to measure flow velocity at all edges of the graph. So problem identification of hydraulic circuit is not correctly formulated. It is necessary use additional criterion (stabilization) for the solving of not correctly identification. Findings. Two criterions were proposed for parameter identification of the circuit. First criterion is the difference between calculated and experimental flow rates. Second criterion is standard deviation from hydraulic resistances to the previously known values. The problem of parameter identification of water heating systems transform to problem of mathematical programming. The algorithm of evolutionary search is applied to solution the problem of identification with two criterions. Second criterion is transformed to constraint in the form of inequality. Originality. The algorithm of evolutionary search is applied to solution the identification problem with two criterions. The original algorithm deals with search of optimal solutions for binary choice relation. The following assumptions are made for choice relation. The choice relation is relation of non-strict order. The two functions enter the evolutionary algorithm, such as generation function and choice function Practical value. Generation function is the special procedure deals with scalar parameters (continuous or discrete). Some parallel evolutionary processes are fulfilled, which name the branches of evolution. After every step of iterate the parameters of the evolutionary search are calculated for another iterate step. There is convergence proof with probability 1 (almost sure convergence) for non-convex binary choice relations. Identification of hydraulic resistances of water heating systems during exploitation is proposed as a stage of project management.

Author Biographies

V. F. Irodov, Dr. Sc. (Tech.), Prof.

Department of System Analysis and Modeling in Heat and Gas Supply, State Higher Education Establishment ―Pridneprovsk State Academy of Civil Engineering and Architecture‖, 24-A, Chernishevskogo str., Dnipro 49600, Ukraine

A. A. Chernoivan, head of lab., ass.

Department of System Analysis and Modeling in Heat and Gas Supply, State Higher Education Establishment ―Pridneprovsk State Academy of Civil Engineering and Architecture‖, 24-A, Chernishevskogo str., Dnipro 49600, Ukraine

References

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Published

2016-09-27

Issue

Section

Energy, ecology, computer technology in construction