Solid state phase change materials for thermal energy storage in passive solar heated buildings
A set of solid state phase change materials was evaluated for possible use in passive solar thermal energy storage systems. The most promising materials are organic solid solutions of pentaerythritol, pentaglycerine and neopentyl glycol. Solid solution mixtures of these compounds can be tailored so that they exhibit solid-to-solid phase transformations at any desired temperature within the range from less than 25 deg to 188 deg. Thermophysical properties such as thermal conductivity, density and volumetric expansion were measured. Computer simulations were used to predict the performance of various Trombe wall designs incorporating solid state phase change materials. Optimum performance was found to be sensitive to the choice of phase change temperatures and to the thermal conductivity of the phase change material. A molecular mechanism of the solid state phase transition is proposed and supported by infrared spectroscopic evidence.
- Research Organization:
- Solar Energy Research Inst., Golden, CO (USA)
- OSTI ID:
- 6378193
- Report Number(s):
- N-84-26163
- Country of Publication:
- United States
- Language:
- English
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Related Subjects
140901* -- Solar Thermal Utilization-- Space Heating & Cooling
COMPUTERIZED SIMULATION
CRITICAL TEMPERATURE
DISPERSIONS
ENERGY STORAGE
ENERGY SYSTEMS
EQUIPMENT
HEAT STORAGE
HEATING SYSTEMS
MATERIALS
MIXTURES
MOLECULAR STRUCTURE
ORGANIC COMPOUNDS
PASSIVE SOLAR HEATING SYSTEMS
PERFORMANCE
PHASE CHANGE MATERIALS
PHASE TRANSFORMATIONS
PHYSICAL PROPERTIES
SIMULATION
SOLAR EQUIPMENT
SOLAR HEATING SYSTEMS
SOLID SOLUTIONS
SOLUTIONS
STORAGE
THERMAL CONDUCTIVITY
THERMODYNAMIC PROPERTIES
TRANSITION TEMPERATURE
TROMBE WALLS
WALLS