Low density hemp shive particleboards for latent thermal energy storage performance

Abstract

Over the past few decades, climate change and the search for renewable energy sources have become hot topics within the research community. About 30% of the world's energy consumption is in the heating and cooling sector of residential buildings. Such materials can reduce the temperature variations, leading to an improvement in human comfort and decreasing at the same time the energy consumption of buildings. This paper assesses the integration of a microencapsulated phase change material (PCMs) with organic composite phase change as the core material and melamine-formaldehyde as the shell in hemp shive intended for building indoor wallboard. Paraffin waxes are cost-effective and have moderate thermal energy storage density but low thermal conductivity and, hence, require large surface area. Commercial manufactured organic PCM-S28 with a 25-29°C melting point received from MikroCaps Ltd. (Slovenia) has been used. The experimental boards were made using cold pressing technology and with 10% Kleiberit Urea Formaldehyde resin (UF) glue as a binding agent. The experimental boards were made 25 mm thick with a density of 310 ± 20 kg/m3 that qualify them as low-density boards. By adding 5% nanocapsules during the board manufacturing process, the heat capacity is increased by 28%.

Microstructure and insulating properties of foamed inorganic polymer composites containing various types of phase change materials (PCM)

“…The reduction in conductivity is an indirect effect since the addition of PCM alone does not reduce the thermal conductivity coe cient. The increase in thermal conductivity is determined by a reduction in the porosity of the insulating material [49,50]. Thermal conductivity for similar unconventional natural raw materials ranges from 0.06 to 0.1 W/m*K [51,52], which is in close agreement with measured values.…”

A sustainable bio‐adsorbent for thermal energy storage for space heating applications

“…The composite showed the thermal conductivity inferior to 0.1 W/m/K. [10] Likewise, Kirilov et al [11] prepared the hemp shives-based composite as an insulating material and found that the thermal conductivity of 0.064-0.067 W/m/K was achieved. [11] Hu et al [12] compared flax shives to extracted flax shives (EFS) and determined the effect of cellulose content on the thermal and mechanical properties of the composite.…”

“…[10] Likewise, Kirilov et al [11] prepared the hemp shives-based composite as an insulating material and found that the thermal conductivity of 0.064-0.067 W/m/K was achieved. [11] Hu et al [12] compared flax shives to extracted flax shives (EFS) and determined the effect of cellulose content on the thermal and mechanical properties of the composite. With 30% EFS, the tensile strength and the modulus of the composite can increase by almost 8% and 100% over those of the polypropylene (PP), respectively.…”