Download Heat and Mass Transfer in the Melting of Frost by William F. Mohs, Francis A. Kulacki PDF

By William F. Mohs, Francis A. Kulacki

This short is geared toward engineers and researchers excited by the refrigeration undefined: particularly, these drawn to strength usage and process potency. The publication provides what the authors think is the 1st entire frost melting examine concerning all facets of warmth and mass move. The volume’s description of in-plane and basic electronic pictures of frost progress and melting is usually designated within the box, and the electronic research process bargains a bonus over invasive dimension tools. The scope of book’s assurance comprises modeling and experimentation for the frost formation and melting methods. the most important sub-specialties to which the publication are aimed comprise refrigeration method research and layout, coupled warmth and mass move, and phase-change processes.

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Additional resources for Heat and Mass Transfer in the Melting of Frost

Sample text

The conductivity of the metal fin is several orders of magnitude greater than that of the frost, and thus temperature gradients in the x-direction are assumed small in comparison to those in the frost layer. 2 Stage I Defrost: Diffusion When heat is applied to the frosted surface, the increase of surface temperature causes a change in the internal temperature distribution of the frost layer. The temperature change also causes a change in the local vapor pressure, and the small pressure difference will cause water molecules to sublimate.

The data base comprises normal and in plane images of the defrost process over a range of ambient temperature, dew point, and surface temperature. Twelve frost layers are created at prescribed surface temperature, dew point, and ambient temperature. Melting is initiated by application of heating on the frosted surface. Predictions of the multistage defrost model developed in Chap. 3 are compared to the reduced data where possible, and empirically based relations for heat and mass transfer are developed.

These investigations have characterized the performance cost of defrost on system operation. An important finding is that defrost efficiency, which is dependent on frost morphology, is related to the growth conditions of the frost layer. Conversely, there apparently have been no investigations of the effect of frost morphology on the defrost process. We address this gap via controlled measurements of heat transfer, transient frost thickness in frosting and defrosting, and transient planar morphology on a thermally controlled vertical surface.

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