Exergy analysis of desiccant cooling systems
Exergy analyses of both fixed-bed and purged-rotary desiccant cooling systems are performed, and the procedures or guidelines for optimization on the basis of minimum entropy generation are presented. The mechanism of entropy generation for the case of combined heat and mass transfer in a two-dimensional channel is investigated. Using the analogy between heat and mass transfer to obtain the mass transfer data, the optimum channel spacing for laminar and turbulent flows are obtained. For two limiting cases of convective heat transfer and isothermal convective mass transfer, the corresponding optimum channel spacings and Reynolds numbers are presented. The second law analysis of a two-dimensional, fixed-bed regenerator is performed. The trade-off between mechanical and thermal exergy losses yields an optimum Ntu and optimum nondimensional operating period. Exergy charts and tables for humid air are constructed for a wide range of conditions, and calculation of the enthalpy and entropy of bound water with consideration of the interfacial force that occurs between silica gel and adsorbed molecules is given.
- Research Organization:
- Illinois Inst. of Tech., Chicago (USA)
- OSTI ID:
- 5401500
- Resource Relation:
- Other Information: Thesis (Ph. D.)
- Country of Publication:
- United States
- Language:
- English
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Related Subjects
71 CLASSICAL AND QUANTUM MECHANICS
GENERAL PHYSICS
COOLING SYSTEMS
ENERGY ANALYSIS
EXERGY
DESICCANTS
CONSERVATION LAWS
HEAT TRANSFER
MASS TRANSFER
OPTIMIZATION
ENERGY
ENERGY SYSTEMS
ENERGY TRANSFER
420400* - Engineering- Heat Transfer & Fluid Flow
657006 - Theoretical Physics- Statistical Physics & Thermodynamics- (-1987)