Alt Title

Computer simulations of energy storing times in a two-component mixture of solid-state phase-change materials in a heat exchange system

Publication Date


Document Type


Degree Name

M.S. (Master of Science)

Legacy Department

Department of Physics


Heat storage; Energy storage; Pentaerythritol tetranitrate; Neopentyl glycol; Phase transformations (Statistical physics); Solids--Thermal properties; Heat exchangers


The main purpose of this thesis is to provide a method with which to determine the time required for heat to be stored in a system which includes a heat exchanger with solid-to-solid phase-change heat storage materials. The secondary purpose is to use the method to simulate the heat storage times for the system with a mixture of a two-component polyal. The method is catered to, but not limited to a solar energy heat exchange system created by Prof. D. L. Bushnell. Analysis of the mixtures of different molecular mass ratios and different total masses of Pentaerythritol (PE) and Neopentaglycol (NPG) is given. These two-component mixtures of the polyals provide phase-change masses for thermal storage at a variety of constant storage temperatures rather than just one. For the materials studied and for those currently known to be available, the higher the phase change temperature the greater will be the enthalpy of storage. Data suggests that mixing a material with low enthalpy and large enthalpy will lower the temperature of the phase-change and also the total energy stored.


Includes bibliographical references (pages [43])


vii, 55 pages




Northern Illinois University

Rights Statement

In Copyright

Rights Statement 2

NIU theses are protected by copyright. They may be viewed from Huskie Commons for any purpose, but reproduction or distribution in any format is prohibited without the written permission of the authors.

Media Type