Improvement of the strength calculation of the tube plate of the shell-tube heat exchanger

The purpose of the article is to improve strength calculation tube plate shell-and-tube heat exchanger, which regulated by interstate standard in force Ukraine. On basis tables, dot plots change coefficients were constructed and analyzed, take into account supporting effect pipes Ф1, Ф2, Ф3 depending on dimensionless parameter board-pipe system ω dependence stiffness coefficient perforated board pressure from side space ηТ. It proposed approximate these dependencies with simple mathematical equations. As a result, it was use cubic regression Ф1 = 0,0422ω3 + 0,2305ω2 – 0,2367ω 2,0179 describe f1(ω) range 0 3 when changing 11, apply quadratic 0,0286ω2 1,8012ω 0,6171. Ф2 f2(ω) 0,5 due slight function can be described linear equation 0.04ω, 2 - 0,0133ω3 0,48ω2 0,4033ω 0,1, 11 0,0046ω3 0,1129ω2 1,8692ω 1,8821. f3(ω) 0,38ω, changes 0,2296ω3 1,3541ω2 0,4884ω 0,1233, 0,0054ω3 0,1060ω2 0,7576ω 1,6129. discrete tabular ψ0 ηТ approximated 0,3419ηТ3 1,8834ηТ2 0,6915ηТ 0,1153. obtained formulas make possible abandon tables additional interpolation intermediate values performing calculations, turn simplifies both itself development appropriate computer programs. average value errors performed approximations 0% 2.05%, indicates high level coincidence equations actual values. for dependences f1(ω), f2(ω), f(ηТ) makes simplify exchangers strength.