Chemical and Biological Engineering ETDs

Sun Sea Pao

Publication Date

4-24-1978

Abstract

The Vacuum-Freezing Vapor-Desublimation and High Pressure Ice-Melting Process has been developed since 1972. In 1976, Mr. T. C. Chung finished a theoretical study of Low Pressure Water Vapor Desublimation Operation. The writer was a co-worker of Mr. Chung, and had worked with him for the study for four months. The information collected in Mr. Chung's thesis was borrowed and edited as Chapters 1 and 2 in the present thesis. Mr. Chung's theory predicts the rate of water vapor desublimation as a function of the difference between operating temperature and desublimer wall temperature. In the present thesis, experimental rates of desublimation were measured at four temperature differences 1° F, 1.5 °F, 2 °F, and 2.5 °F. These experimentally obtained rates agreed quite well with theoretical values predicted. Therefore, the equivalent average heat transfer coefficients (hav) were derived and calculated. The hav value under a practicaldesublimation operation was between 1000 and 2000 Btu/hr • ft2 • °F. A theoretical study of Evaporative Freezing Operations Conducted in an Extended Surface Freezer was made, of which an equivalent heat transfer coefficient was calculated. The hav was greater than 11,000 Btu/hr • ft2 • °F. A comparison between an extended freezer and an agitated freezer was made, and from a theoretical point of view, the former has more advantages than the latter.

Document Type

Thesis

Language

English

Degree Name

Chemical Engineering

Level of Degree

Masters

Department Name

Chemical and Biological Engineering

First Committee Member (Chair)

Chen-Yen Cheng

Second Committee Member

David Kauffman

Third Committee Member

Frank Lynn Williams

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