The possibility of using thermal mark for estimation flow meters in water heating system

A. A. Chernoivan, V. F. Irodov

Abstract


Abstract.  Purpose.  To  determine hydraulic parameters of  water heating systems during operation the identification of hydraulic  circuit is applied. The mathematical model of the hydraulic circuit is the model with concentrated parameters. The 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”. One of the methods for measuring liquid or gas flows is a mark method, and of the possible marks in the  heating  system  is  acceptable  to use  thermal  mark.  The  purpose of  the  work  is  to  confirm  experimentally  the  possibility  of  using  thermal marks to assess water flow  in the pipe water heating system.  Methodology.  There are measuring of some parameters of the  circuit 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.  An  experimental  installation  was  developed  for  detection  capabilities of thermal marks. The typical dimensions of the tube - diameter, wall thickness and length of the elementary pipe section  – are typical for similar sized heating systems. Detection of thermal mark was fixed mounted thermal sensors on the outside of pipes.  Findings. Fixing signals thermal sensors, which are mounted on the outside of pipes and fix the water flows inside the tubes showed  that the speeds typical of  water for water heating systems use thermal mark is perfectly acceptable for the estimation of water flow. Originality. It is shown that the estimation of water flows for water heating systems by using thermal marks can be used to refine the parameters of  hydraulic modes of heating systems in operation.  Practical value.  Using thermal marks in the water heating system  will  significantly  improve  the  accuracy  of  identification  of  the  heating  network  parameters  during  operation.  Identification  of  hydraulic resistances of water heating systems during exploitation is proposed as a stage of project management.


Keywords


thermal mark; water heating system; flow meter, experimental estimation; hydraulic resistances; project management

References


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