Analysis of ice formation with flow reversal for application to an ice-maker heat pump Public Deposited

http://ir.library.oregonstate.edu/concern/graduate_thesis_or_dissertations/9g54xn42f

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  • The problems of freezing and melting present special mathematical complexity and, except for the most elementary one-dimensional cases, require a numerical solution. However, these problems have a growing importance in engineering problems because of their application to metallurgical operations, food preservation, heating and air conditioning, etc. In the present work, a numerical model for ice formation from flowing water in a finned annular sector is developed. The model predicts ice profiles as a function of axial position and time, and energy transfer values as a function of time. The model also allows flow direction reversals in the annular sector. The flow reversal melts part of the ice existing in the annulus. Also, part of the ice detaches, allowing it to flow out with the liquid water. This enhances the energy transfer values. The model uses an arbitrary criterion for melting and detaching. The model is used for a preliminary evaluation of an ice-maker heat pump evaporator operating with flow reversal. Flow reversal de-ices the evaporator surfaces and enhances the heat transfer. Therefore, the flow reversal method is suggested as an alternative for de-icing without the losses commonly associated with the methods currently used to accomplish this. The results of the preliminary evaporator evaluation show a large energy transfer gain for the reversal case, as compared to the energy transfer obtained without reversal. Most of the gain comes from an increased cooling of the liquid water (more sensible energy from the water is being transferred to the refrigerant). The model predicts only a small amount of ice detachment from the evaporator. Further study in this area is recommended for completing the evaluation of the evaporator. A better ice melting-detaching criterion and a more complete parametric evaluation of the evaporator are required.
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