Method of Accounting for the Presence of Scale Deposits on Heat Meter Reading

About the authors:

Pavel Yu. Mikhaylov, Cand. Sci. (Phys.-Math.), Associate Professor, Oil and Gas Flow Measurement Department, University of Tyumen; pav84369437@yandex.ru

Aleksandr V. Kurakh, Post-Graduate Student, Tyumen State University; sashakurax@gmail.com

Abstract:

The article dwells upon the problem of incorrect operation of the heat meter due to unreliable measurement of the actual temperature of non-isothermal coolant flow caused by scale deposition on the surface of the temperature sensor pocket. The presented design procedure allows to estimate the time required for the reliable determination of the actual flow temperature, accounting for the thickness of calcification and its thermal properties. The described technique is based on the solution of non-stationary heat equation with the help of control volume method accounting for the problem’s radial symmetry. On the most frequent example in the composition of the heat meter resistance thermometers (RTD-5071) the curves of the temperature inertia are constructed, and economic losses for different thicknesses of sulfate scale are evaluated.

References:

1. H. Wong. 1979. Osnovnye formuly i dannye po teploobmenu dlya inzhenerov. Spravochnik [Basic Formulas and Data on Heat Transfer for Engineers. Reference Book]. Moscow: Atomizdat.
2. Izvestija Tulskogo gosudarstvennogo universiteta. 2014. Izvestija Tulskogo gosudarstvennogo universiteta. Tekhnicheskie nauki, no 2. Tula: Tula State University.
3. RF Gosstroy, consortium “ServisInzhStroi.” 1998. Ustanovka priborov kommercheskogo ucheta teplovoi energii. Tekhnicheskie resheniya [Installation of Instruments for Commercial Account of Heat. Technical Solutions]. Moscow.
4. RF Gosstroy. Order no 105 of May 6, 2000. “Ob utverzhdenii Metodiki opredeleniya kolichestv teplovoi energii i teplonositelei v vodyanykh sistemakh kommunalnogo teplosnabzheniya” [On Approval of Procedures for Determining the Amount of Heat Energy and Heat Carriers in Water Systems of Public Heat Supply].