  Polyurethane (PU) is an ideal thermal insulation material due to its
excellent thermal properties. The incorporation of Phase Change Materials
(PCMs) capsules into Polyurethane (PU) has been shown to be effective in
building envelopes. This design can significantly increase the stability of the
indoor thermal environment and reduce the fluctuation of indoor air
temperature. We develop a multiscale model of a PU-PCM foam composite and study
the thermal conductivity of this material. Later, the design of materials can
be optimized by obtaining thermal conductivity. We conduct a case study based
on the performance of this optimized material to fully consider the thermal
comfort of the occupants of a building envelope with the application of PU-PCMs
composites in a single room. At the same time, we also predict the energy
consumption of this case. All the outcomes show that this design is promising,
enabling the passive design of building energy and significantly improving
occupants' comfort.
