Abstract
As an essential facility for crop growth, the greenhouse creates an indoor microclimate that affects not only the growth quality of vegetation, but also the energy consumption and carbon emission of agriculture. China's agriculture has long been restricted by the traditional nature-dependent mode and lacks an comprehensive theoretical brace for the design and reform of greenhouses. Based on the exothermic and endothermic principle of phase change materials (PCM(s)), this study mainly focuses on the implantation of PCM(s) layers into the envelopes of an actual greenhouse for passive heating. A dynamic simulation of the whole-day indoor temperature self-regulation performance of the greenhouse was performed, and the calculation model was verified. Results show that the embedding of PCM(s) layer in the envelope structure can cut down the high temperature (>30 °C) during daytime and release heat to indoor delayed at night for warming up around 1–2 °C. The north wall is the key component for laying PCM(s), and the critical thickness is the best thermal performance thickness for heating effect. This design solely relies on solar energy with zero carbon emission, and allows for winter passive heating.
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