By Li-Zhi Zhang
Conjugate warmth and Mass move in warmth Mass Exchanger Ducts bridges the space among basics and up to date discoveries, making it a priceless instrument for somebody trying to extend their wisdom of warmth exchangers. the 1st e-book out there to hide conjugate warmth and mass move in warmth exchangers, writer Li-Zhi Zhang is going past the fundamentals to hide fresh developments in apparatus for power use and environmental keep an eye on (such as warmth and moisture restoration ventilators, hole fiber membrane modules for humidification/dehumidification, membrane modules for air purification, desiccant wheels for air dehumidification and effort restoration, and honeycomb desiccant beds for warmth and moisture control). Explaining the information at the back of and the purposes of conjugated warmth and mass move permits the layout, research, and optimization of warmth and mass exchangers. Combining this lately came upon info into one resource makes it a useful reference for execs, lecturers, and different events.
- A research-based procedure emphasizing numerical tools in warmth mass transfer
- Introduces simple facts for exchangers' layout (such as friction components and the Nusselt/Sherwood numbers), easy methods to remedy conjugated difficulties, the modeling of varied warmth and mass exchangers, and more
- The first ebook to incorporate lately chanced on developments of mass move and fluid circulation in channels made out of new materials
- Includes illustrations to visually depict the book's key concepts
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Extra info for Conjugate Heat and Mass Transfer in Heat Mass Exchanger Ducts
4 A schematic of a desiccant wheel. As can be seen, it rotates between the process air (the fresh air) and the regenerating air. Heat and moisture in the fresh air are absorbed by the ducts walls. It becomes dry air after flowing out of the ducts. The adsorbents walls adsorb moisture and become saturated. Their capability to dry air is refreshed after they rotate through the regenerating zone, where hot air flows in the ducts and drives the moisture out. The wheel rotates continuously and the fresh air is dried continuously.
This is the regeneration mode. 4 The mathematical model Fluid flow and conjugate heat and mass transfer in the duct are considered. The flow in the duct is considered to be laminar and hydrodynamically fully developed, but developing in temperature and concentration in the entrance region of the duct. The fluid is Newtonian with constant thermal properties. 1 Air stream The governing equations are summarized as follows [16,17]. 8) where μ is dynamic viscosity of air stream (Pa s), u is fluid velocity (m/s), P is the pressure (Pa), z is the axial coordinate (m).
4 The Mathematical Model 33 As can be seen, this model considers both the internal resistance of the adsorbents and the external resistance in the pores of the adsorbents. 61) Still considering both the internal and the external resistance, substituting Eq. 49), the above Eqs. 71) where wmax and wmin are the maximum and minimum water uptake in the solid. Usually, in the solid, heat conduction and mass diffusion in fin thickness are much larger than in other two directions, and the heat conduction and mass diffusion in fin height and in duct length can be ignored.
Conjugate Heat and Mass Transfer in Heat Mass Exchanger Ducts by Li-Zhi Zhang