Software-based calculation of pipeline thermal insulation for a specified outer surface temperature of the insulation structure

Objective. Thermal insulation of pipelines plays an important role in conserving non-renewable fuel and energy resources and in protecting the environment from harmful emissions and greenhouse gases. The aim of the study is the development and implementation of an algorithm for the computational determination of the insulation thickness and the calculation of the thermal performance characteristics of a pipeline insulation system, corresponding to a specified temperature on its outer surface. Method. The methodological basis of the study is the theory of steady-state heat transfer through a multilayer cylindrical wall. The novelty of the work lies in the development of a computerized calculation algorithm that extends the standard approach by determining a set of thermotechnical parameters, as well as in the implementation of a result verification procedure that ensures their reliability and compliance with regulatory requirements. The calculations are performed using the method of successive approximations. Result. For a steel pipeline with a nominal diameter of 300 mm (325 mm × 8.0 mm) and a temperature of dry saturated steam of 250 0С, the specified outer surface temperature of the insulation system of 45 0С can be achieved using mineral wool cylinders with a calculated insulation thickness of 244 mm. In this case, the linear heat flux density through the cylindrical insulation system is 111 W/m, which does not exceed the allowable standard value (148 W/m). Conclusion. The developed software enables automated calculations for the design of pipeline thermal insulation. The builtin verification of computational results ensures the correctness of calculations and eliminates numerical errors.