METHOD FOR DETERMINATION OF HEAT ENERGY AND MASS OF HEAT CARRIER LEAKS IN CLOSED WATER HEAT SUPPLY SYSTEMS AND HEAT METER FOR IMPLEMENTATION THEREOF

摘要

FIELD: physics.;SUBSTANCE: invention relates to experimental equipment and can be used in power engineering, heat and water supply of utilities, industrial facilities. Disclosed is a heat meter used in closed water heat supply systems, comprising supply and return pipelines, each of which is equipped with a volumetric electromagnetic flow meter (EFM) and a temperature sensor. Both EFM and both temperature sensors are graduated individually and in a pair. In each pipeline there is also one pressure sensor. Heat meter is also supplemented with units for calculating density, specific enthalpy, mass flow rate, unit for direct measurement of volumetric flow difference, unit for calculation of difference of mass flow rates, mass block of heat carrier leaks withdrawn from water heat supply systems (WHSS). At the end of the return pipeline there is a valve. According to the disclosed method, heat energy and heat carrier weight are determined with allowance for components that have left with leaks in closed water heat supply systems. For this purpose, in the supply and return pipelines the following values are measured: volumetric flow rates q₁, q₂, temperature and pressure for calculating densities ρ₁, ρ₂ and specific enthalpy h₁, h₂, difference Δq volume flow rate q₁, q₂, difference Δρ densities ρ₁, ρ₂, difference of mass flows Δm = q₁ Δρ + ρ₂ Δq. Mass taken from the WHSS as is determined. Thermal energy is defined by equation from which follows heat energy consumed at object during considered period of time τ₁ - τ₀ at boundary of object balance. Method comprises obtaining formula for determining limits of measurement errors of heat energy as: , where in equations, the upper indices in brackets indicate the version of error which version is implemented; α m₂/m₁ = 1, parameter β = h₂/h₁, β_t = t₂/t₁. Leakage mass errors M_y are determined by formula: . At the output of the indicator, the required parameters specified in the software, operating documents and wired-in in the memory of the heat meter are obtained.;EFFECT: technical result is higher accuracy of obtained results.;2 cl, 1 dwg