Abstract
Simulation techniques are used to examine the performance of air-based solar heating systems utilizing phase change energy storage (PCES). The effects of storage size, melting temperature, and latent heat on the thermal performance of the system are quantified for various load characteristics, collector types, and control strategies. The effect of semi-congruent melting of the phase-change material (PCM) on system performance is also examined. Based on these simulations, 1. (1) optimum physical properties of the PCM have been identified, 2. (2) an empirical method for sizing PCES units has been developed, 3. (3) a system-oriented figure of merit for comparing different PCMs has been established, and 4. (4) the economic gains associated with the storage volume reductions achieved with PCES, vis-à-vis sensible heat storage in rock beds, have been quantified.
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