Abstract
This study is focused on the preparation and performance of a building energy storage panel (BESP). The BESP was fabricated through a mold pressing method based on phase change material particle (PCMP), which was prepared in two steps: vacuum absorption and surface film coating. Firstly, phase change material (PCM) was incorporated into expanded perlite (EP) through a vacuum absorption method to obtain composite PCM; secondly, the composite PCM was immersed into the mixture of colloidal silica and organic acrylate, and then it was taken out and dried naturally. A series of experiments, including differential scanning calorimeter (DSC), scanning electron microscope (SEM), best matching test, and durability test, have been conducted to characterize and analyze the thermophysical property and reliability of PCMP. Additionally, the thermal performance of BESP was studied through a dynamic thermal property test. The results have showed that: (1) the surface film coating procedure can effectively solve the leakage problem of composite phase change material prepared by vacuum impregnation; (2) the optimum adsorption ratio for paraffin and EP was 52.5:47.5 in mass fraction, and the PCMP has good thermal properties, stability, and durability; and (3) in the process of dynamic thermal performance test, BESP have low temperature variation, significant temperature lagging, and large heat storage ability, which indicated the potential of BESP in the application of building energy efficiency.
Highlights
With the improvement of economic conditions and peoples’ living standards, peoples’requirements for the thermal environment inside the building have gradually improved [1,2,3], resulting in energy consumption rapidly growing for the air conditioning and heating supply [4,5]
Phase change material (PCM) can increase the thermal inertia of the building envelope and reduce heat loss through latent heat storing to achieve building energy efficiency; on the other hand, PCM can decrease the temperature fluctuation in the building by repeating its thermal absorbing and releasing circulation, for enhancing indoor thermal comfort
The immersion method has improved the performance of the direct incorporation method, the leakage of liquid PCM still occurred, especially after repeated cycles [8]
Summary
With the improvement of economic conditions and peoples’ living standards, peoples’. requirements for the thermal environment inside the building have gradually improved [1,2,3], resulting in energy consumption rapidly growing for the air conditioning and heating supply [4,5]. Leakage of PCM can reduce the total amount of PCM used in building, and the mechanical property of construction can be affected by the interaction between leaked PCM and cement mortars [14] To overcome these issues, composite PCMs with encapsulation techniques, inclusive of microencapsulated PCM and form-stable PCM, have been extensively and deeply studied in recent years. The stability and thermal property have been studied and improved in the recent research, an undesired problem of melted PCM leaking from porous materials has been reported. The energy storage panel was developed by composite PCM particles and a small amount of adhesives, which can enhance the percentage of PCMs and, achieve a considerable thermal storage capacity. Related property studies of PCM particle and energy storage panels for the building application were conducted
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