A simple and effective model for prediction of effective thermal conductivity of vacuum insulation panels

Future Cities and Environment

Table 1 The main parameters of the core materials

	Parameters
	Dimension mm × mm × mm	Density Kg/m³	Pore diameter	Porosity	Mean diameter	Barrier membrane
open cellular foam polyurethane	300 × 300 × 20	50 ~ 75	80 ~ 100 μm	95 %	72 μm	High barrier laminates
superfine fibrous glass mate	300 × 300 × 20	200 ~ 250	2 ~ 10 μm	>90 %	6 μm	High barrier laminates
nano-grain silica dioxides mixed with a few short glass fibers.	300 × 300 × 20	180 ~ 200	10 ~ 40 nm	>95 %	32 nm	High barrier laminates and nylon film