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0.8 0.7 r::: 0 :;::: (J 0.6 ... "' LL Cl) 0.5 Cl r::: ·;; 0.4 "' ... f/) 0.3 f/) 0"' 0.2 - - - Concrete - - - PCM K = 0.115 Btu/ft-°F-h (0.199 W/m-K) - · - PCM K = 0.578 Btu/fi-°F-h (1.00 W/m-K) T1 =84°F(29°C) Concrete Thickness 0 4.0 8.0 12.0 16.0 20.0 24.0 (in.) 0.9r'--,---.--,----.--.---.--'----, 0.1 0 0 0 1.0 2.0 3.0 4.0 5.0 5 10 PCM Thickness 6.0 (in.) 15 (em) Denver, CO Figure 2. Solar Saving Fraction as a Function of Trombe Wall Thickness for SS PCMs and Concrete Direct Gain Buildings designed for direct gain passive solar heating usually include mas- sive components made of concrete, brick, adobe, etc. to absorb the solar heat. A well designed phase-change thermal energy storage material can store the same amount of heat in a much less massive component. Figure 3 shows the annual energy savings for various types of thermal storage based on simulation results from references 3 and 4 assuming high latent heat capacity (521 Btu per square foot of storage area). Hare recent analysis (5) indicates that similar performance can be obtained with approximately 1500 Btu of latent heat capacity per square foot of window area. At low values of solar saving fraction, the energy saving per unit window area is great because the solar gains are small compared to heating loads for most of the heating season and are therefore well-utilized. If PCHs are used, then the delivery of absorbed solar heat is delayed and prolonged so that the heat is well util- ized even at high solar savings fraction 1r1hen the solar gains are a large fraction of the total heating load. 5 TP-2727PDF Image | New Phase-Change Thermal Energy Storage Materials for Buildings
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