Simulation of phase change materials in building walls using effective heat capacity model by recent numerical methods

Abstract

This paper aims to simulate the time-development of the temperature of phase change materials (PCMs) using an effective heat capacity model. We employ recently published and efficient explicit numerical methods, and validate our approach against established mathematical expressions and models in the literature. Our research investigates various building wall geometries and boundary conditions, with a primary focus on employing the Effective Heat Capacity model to manage heat loads. The objective is to maintain interior temperatures within comfort zones. We compare two types of paraffin wax PCMs. The first one is characterized by a lower melting temperature and higher latent heat capacity, thus it can efficiently store external heat when combined with brick or concrete. In contrast, we obtained that the second one, with its higher melting temperature and lower latent heat capacity, allows more external heat prevent. Regardless of the wall material, whether brick or concrete, our simulations consistently demonstrate the PCM's effectiveness in minimizing heat prevent into indoor environments. In conclusion, this study advances our understanding of PCMs through the application of the Effective Heat Capacity model. Our work offers valuable insights for energy-efficient building designs and underscores the significance of making precise PCM choices in construction practices.

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