Abstract :
[en] The greenhouse enables to promotion of plant yield through creating an optimal environment. Efficient solar energy conversion and storage is a promising strategy to address the energy shortage issue of greenhouses in winter. This paper prepares form-stable composite phase change materials (PCMs) to store solar energy efficiently. Lightweight and porous balsa wood subjected to high-temperature carbonization is designed to simultaneously solve the liquid leakage, enhance the thermal conductivity, and improve the photothermal conversion and thermal energy storage of PCM. OP44E and SEBS are utilized as PCM and thickeners, followed by vacuum impregnation into the
carbonized balsa wood (CW). Results indicate that the carbon content of CW increases with the augment of carbonization temperature. Shaping effects of CW and SEBS endow-composite PCMs to have the highest adsorption rate of 92.7 wt.% with enthalpy
over 190 J/g. Composite PCMs reveal reliable thermal properties and thermal stability
below 100 °C. Composite PCMs have photothermal conversion larger than 88% under
xenon lamp radiation. The temperature of PCMs on the shallow layer is higher owing to
their photothermal conversion capacity. Greenhouse test indicates that
CW/OP44E/SEBS greenhouse gains a higher PCM temperature of 71.5 °C at 70 min,
compared to 40.3 °C in empty and OP44E/SEBS cases. CW/OP44E/SEBS
greenhouse maintaining indoor temperature over 20 °C lasts 15.3 min longer than
empty and OP44E/SEBS greenhouses. In addition, form-stable composite PCMs
feature excellent thermal stability, and photothermal conversion is capable of
maintaining the stable indoor temperature of a greenhouse, indicating potential in the field of agricultural building temperature regulation.
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