Asymmetrical vacuum-insulated glazing unit

A vacuum insulating glazing unit provided with an infrared reflecting coating, having a length L, with 300 mm≤L≤4000 mm, and a width W, with 300 mm≤W≤1500 mm, and comprising:

• a. a first glass pane having an inner pane face and an outer pane face, having a thickness Z1, with the first glass pane having an energetical absorptance EA1,
• b. a second glass pane having an inner pane face and an outer pane face and having a thickness, Z2, with the second glass pane having an energetical absorptance EA2 and bearing the infrared reflective coating on its inner pane face;
• c. a set of discrete spacers positioned between the first and second glass panes, maintaining a distance between the first and the second glass panes and forming an array having a pitch λ, the pitch, λ being comprised between 10 mm and 35 mm;
• d. a hermetically bonding seal sealing the distance between the first and second glass panes over a perimeter thereof;
• and
• e. an internal volume, V, defined by the first and second glass panes and the set of discrete spacers and closed by the hermetically bonding seal and wherein there is a vacuum of absolute pressure of less than 0.1 mbar,
• f. wherein the inner pane faces of the first and second glass panes face the internal volume, V and;
• g. wherein the first glass pane is thicker than the second glass pane (Z1>Z2), and in that ΔEA≤0.0033 ΔZ2/mm2−0.0468 ΔZ/mm+0.7702;
• wherein ΔEA=EA1−2*EA2, and in that Z1≥5 mm, Z2≥3 mm, and ΔZ=(Z1−Z2)≥1 mm, and in that 10 mm≤λ≤35 mm.