NDLI: Modeling Phase Change Materials With Conduction Transfer Functions for Passive Solar Applications

Content Provider	The American Society of Mechanical Engineers (ASME) Digital Collection
Author	Jason, P. Barbour Douglas, C. Hittle
Copyright Year	2003
Abstract	The use of passive solar design in our homes and buildings is one way to offset the ever-increasing dependence on fossil fuels and the resulting pollution to our air, our land, and our waters. A well-designed sunroom has the potential to reduce the annual heating loads by one-third or more. By integrating phase change materials (PCMs) into building elements such as floor tile and wallboard, the benefits of the sunroom can be further enhanced by providing enhanced energy storage. To maximize benefits from PCMs, an engineering analysis tool is needed to provide insight into the most efficient use of this developing technology. Thus far, modeling of the phase change materials has been restricted to finite difference and finite element methods, which are not well suited to inclusion in a comprehensive annual building simulation program such as BLAST or EnergyPlus (BLAST Support Office, 1991; Crawley et al, 2001). Conduction transfer functions (CTFs) have long been used to predict transient heat conduction in such programs (Sowell and Hittle, 1995). Phase changes often do not occur at a single temperature, but do so over a range of temperatures. The phase change energy can be represented by an elevated heat capacity over the temperature range during which the phase change occurs (Kedl, 1991). By calculating an extra set(s) of CTFs for the phase change properties, the CTF method can be extended to include the energy of phase transitions by switching between the two (or more) sets of CTFs. This method can be used to accurately predict the internal and external temperatures of PCM-containing building elements during transient heat conduction. The amount of energy storage and release during a phase transition can also be modeled with this method, although there may be some degree of inaccuracy due to switching between two or more sets of CTFs.
Sponsorship	Solar Energy Division
Starting Page	81
Ending Page	92
Page Count	12
File Format	PDF
ISBN	0791836762
DOI	10.1115/ISEC2003-44073
e-ISBN	0791836649
Volume Number	Solar Energy
Conference Proceedings	ASME 2003 International Solar Energy Conference
Language	English
Publisher Date	2003-03-15
Publisher Place	Kohala Coast, Hawaii, USA
Access Restriction	Subscribed
Subject Keyword	Water Temperature Wallboard Transfer functions Heat capacity Transient heat transfer Fossil fuels Finite element methods Modeling Phase transitions Stress Heat conduction Phase change materials Design Pollution Simulation Tiles Heating Solar energy Structures Energy storage
Content Type	Text
Resource Type	Article

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