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Run-Around Energy Recovery System for Air-to-Air Applications Using Cross-Flow Exchangers Coupled with a Porous Solid Desiccant—Part I: Model Development and Verification
Heat and moisture transfer between supply and exhaust air streams are investigated for a run-around system in which the coupling material is a desiccant coated solid that is transported between two exchangers. The finite volume method is used to solve the governing partial differential equations of the cross-flow heat exchangers in the supply and exhaust ducts under steady state operating conditions. The outlet air properties are calculated for several inlet air operating conditions and desiccant properties. The accuracy of the model is verified by comparing the simulations with well-known theoretical solutions for a single cross flow heat exchanger and a liquid coupled run-around system. The difference between the analytical predictions and numerical model for sensible effectiveness for each exchanger and the run-around system were found to be less than 1% over a range of operating conditions. The model is also verified by modifying the boundary conditions to represent a counter flow energy wheel and comparing the calculated sensible, latent and total effectiveness values with correlations in the literature. Part II of this paper will investigate the sensible, latent and total effectivenesses during simultaneous heat and moisture transfer.
Run-Around Energy Recovery System for Air-to-Air Applications Using Cross-Flow Exchangers Coupled with a Porous Solid Desiccant—Part I: Model Development and Verification
Heat and moisture transfer between supply and exhaust air streams are investigated for a run-around system in which the coupling material is a desiccant coated solid that is transported between two exchangers. The finite volume method is used to solve the governing partial differential equations of the cross-flow heat exchangers in the supply and exhaust ducts under steady state operating conditions. The outlet air properties are calculated for several inlet air operating conditions and desiccant properties. The accuracy of the model is verified by comparing the simulations with well-known theoretical solutions for a single cross flow heat exchanger and a liquid coupled run-around system. The difference between the analytical predictions and numerical model for sensible effectiveness for each exchanger and the run-around system were found to be less than 1% over a range of operating conditions. The model is also verified by modifying the boundary conditions to represent a counter flow energy wheel and comparing the calculated sensible, latent and total effectiveness values with correlations in the literature. Part II of this paper will investigate the sensible, latent and total effectivenesses during simultaneous heat and moisture transfer.
Run-Around Energy Recovery System for Air-to-Air Applications Using Cross-Flow Exchangers Coupled with a Porous Solid Desiccant—Part I: Model Development and Verification
Li, Meng (author) / Simonson, Carey J. (author) / Besant, Robert W. (author) / Shang, Wei (author)
HVAC&R Research ; 15 ; 537-559
2009-05-01
23 pages
Article (Journal)
Electronic Resource
Unknown
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