Abstract
Parallel and cross-flow with both fluids unmixed, direct transfer type heat exchangers are modeled utilizing a thermal network consisting of nodes and resistors. A commercially available software package, Thermonet, calculates the transient outlet temperatures for a steadystate model introduced to a sudden change (step input) in inlet temperature of the Cmin fluid stream. Both models are validated against analytical solutions provided in literature. Solutions are verified to within a maximum percent mean difference of 4 % of analytical solutions for parallel-flow, and 8 % of analytical solutions for cross-flow heat exchangers. Tables are generated which provide new dimensionless transient outlet temperature effectiveness values for parallel and cross-flow with both fluids unmixed, heat exchangers. The parallel-flow temperature responses are presented in graphical form for the specific parameters: NTU equal to 0.5, 1.0, and 3.0; C* equal to 0.2, 0.6, and 1.0; R* equal to 0.5, 1.0, and 2.0; Cw* equal to 1.0, 10.0, and 1000.0; and td equal to 0.25, 1.0, and 4.0. The cross-flow temperature responses are presented in graphical form for the same parameters listed above except NTU is equal to 1.0. Discussion regarding the dimensionless parameters' effects on the transient response of the heat exchanger is provided. The transient performance tables provide a quick reference for transient outlet temperature solutions required for practical industrial heat exchanger analysis.
Library of Congress Subject Headings
Heat exchangers; Fluid mechanics; Heat--Transmission; Heat engineering
Publication Date
12-1-1995
Document Type
Thesis
Department, Program, or Center
Mechanical Engineering (KGCOE)
Advisor
Kandilar, Satish
Advisor/Committee Member
Karckar, Balwant
Advisor/Committee Member
Nye, Alan
Recommended Citation
Cole, Brian D., "Transient performance of parallel-flow and cross-flow direct transfer type heat exchangers with a step temperature change on the minimum capacity rate fluid stream" (1995). Thesis. Rochester Institute of Technology. Accessed from
https://repository.rit.edu/theses/5869
Campus
RIT – Main Campus
Comments
Note: imported from RIT’s Digital Media Library running on DSpace to RIT Scholar Works. Physical copy available through RIT's The Wallace Library at: TJ263.C643 1995