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A double-pipe heat exchanger consists of two hairpins connected in series. Each hairpin is 20 ft long with the follow configuration: Outer pipe: 4-in. schedule 40 Inner pipe: 2-in. schedule 40 with 36 fins Fin height: 0.75 in. The petroleum fraction of Problem 4.2 will flow in the annulus at a rate of 20,000 lb/h. (a) Calculate the heat-transfer coefficient, ho, for the annulus. (b) Calculate the total pressure drop, Po, for the annulus. Ans. (a) 94 Btu/h ft² °F. (b) 3.6 psi. = 4.5in APf= Do D₁ = 4.43in DHydr = 0.43in| Fin thickness: 0.035 in. Nozzles: 2-in. schedule 40 Return bends: Internal T A = (4.5² — 4.43²) = 0.076ft² 4 fLpV² 2gc Di f→ Darcyfric

A double-pipe heat exchanger consists of two hairpins connected in series. Each hairpin is 20 ft long with the follow configuration: Outer pipe: 4-in. schedule 40 Inner pipe: 2-in. schedule 40 with 36 fins Fin height: 0.75 in. The petroleum fraction of Problem 4.2 will flow in the annulus at a rate of 20,000 lb/h. (a) Calculate the heat-transfer coefficient, ho, for the annulus. (b) Calculate the total pressure drop, Po, for the annulus. Ans. (a) 94 Btu/h ft² °F. (b) 3.6 psi. = 4.5in APf= Do D₁ = 4.43in DHydr = 0.43in| Fin thickness: 0.035 in. Nozzles: 2-in. schedule 40 Return bends: Internal T A = (4.5² — 4.43²) = 0.076ft² 4 fLpV² 2gc Di f→ Darcyfric

Introduction to Chemical Engineering Thermodynamics
Introduction to Chemical Engineering Thermodynamics
8th Edition
ISBN:9781259696527
Author:J.M. Smith Termodinamica en ingenieria quimica, Hendrick C Van Ness, Michael Abbott, Mark Swihart
Publisher:J.M. Smith Termodinamica en ingenieria quimica, Hendrick C Van Ness, Michael Abbott, Mark Swihart
Chapter1: Introduction
Section: Chapter Questions
Problem 1.1P
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(4.5) A double-pipe heat exchanger consists of two hairpins connected in series. Each hairpin is 20 ft long with the following configuration: Outer pipe: 4-in. schedule 40 Inner pipe: 2-in. schedule 40 with 36 fins Fin height: 0.75 in. The petroleum fraction of Problem 4.2 will flow in the annulus at a rate of 20,000 lb/h. (a) Calculate the heat-transfer coefficient, ho, for the annulus. (b) Calculate the total pressure drop, A Po, for the annulus. Ans. (a) 94 Btu/h ft2 °F. (b) 3.6 psi. ΔΡΑ = 4.5in = Do D₁ = 4.43in DHydr = 0.43in| TT A 1 = (4.5² — 4.43²) = 0.076ft² Fin thickness: 0.035 in. Nozzles: 2-in. schedule 40 Return bends: Internal fL₂V² 2gc Di f→ Darcyfric
Transcribed Image Text:(4.5) A double-pipe heat exchanger consists of two hairpins connected in series. Each hairpin is 20 ft long with the following configuration: Outer pipe: 4-in. schedule 40 Inner pipe: 2-in. schedule 40 with 36 fins Fin height: 0.75 in. The petroleum fraction of Problem 4.2 will flow in the annulus at a rate of 20,000 lb/h. (a) Calculate the heat-transfer coefficient, ho, for the annulus. (b) Calculate the total pressure drop, A Po, for the annulus. Ans. (a) 94 Btu/h ft2 °F. (b) 3.6 psi. ΔΡΑ = 4.5in = Do D₁ = 4.43in DHydr = 0.43in| TT A 1 = (4.5² — 4.43²) = 0.076ft² Fin thickness: 0.035 in. Nozzles: 2-in. schedule 40 Return bends: Internal fL₂V² 2gc Di f→ Darcyfric
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