A possible alternative approach to the thermal insulation of pipelines

✍ Scribed by S.D. Probert; C.Y. Chu; C.M. Yeung

• Publisher: Elsevier Science
• Year: 1982
• Tongue: English
• Weight: 841 KB
• Volume: 11
• Category: Article
• ISSN: 0306-2619
• DOI: 10.1016/0306-2619(82)90045-9

✦ Synopsis

The concept of internally lining pipes to achieve the required degree of thermal insulation is examined with respect to minimising the rate of energy losses. Suggestions are made concerning the optimal dimensions ,for district-heating horizontal pipelines conveying hot water at 95°C. These design recommendations arise out of the presented analysis Jor minimising the total rate of financial expenditure upon energy Jor pumping and heating the water. NOMENCLATURE a,b b' Cp D1, D2

Coefficients representing costs for heat and pumping energy, respectively (arbitrary financial units per Ws expended).

Effectit'e cost of energy per Ws supplied to the pump, making due allowance for the fact that some of this energy re-appears as heat in the flowing liquid (arbitrary financial units per Ws expended). Specific heat of the considered pumped fluid (J kg-1 K-~). Internal diameters respectively of the considered flow channel and the structurally strong, outer member of the pipeline (e.g. conventionally a metal pipe), (m). Thickness of the structurally strong, outer member of the pipeline, (m).