Inzulating Glazing Unit, in Particular for Refrigerated Chamber Door

An insulating glazing unit constructed and arranged for use in a leaf of a refrigerated enclosure, the glazing unit comprising:

• at least first and second glass substrates, the first glass substrate having a first external face and a second face, the second glass substrate having a third face and fourth external face, the glazing unit is constructed such that when installed in a leaf and the leaf is in a closed position the first external face is exposed to an external environment and the fourth external face is in contact with an environment inside a refrigerated enclosure;
• at least one spacer of low thermal conductivity retaining the first and second glass substrates spaced apart, the spacer having a thermal conductivity of less than 1 W/m.K;
• a low-E (low-emissivity) coating at least partly on a face of at least one of the glass substrates;
• and
• an anti-frost coating on at least part of the fourth external face, wherein,
• an airspace defined between the first and second substrates is filled with at least one rare gas;
• the glazing unit contains no heating element;
• the glazing unit has a thermal conductivity coefficient U of less than 1.2 W/m2.K with a gas filling of at least 85%;
• and
• the glazing unit has a light transmission of at least 67% and a light reflection of less than 18%.

An insulating triple glazing unit constructed and arranged to be used in a leaf of a refrigerated enclosure, the glazing unit comprising:

• a first glass substrate having a first external face and a second face;
• a second glass substrate having a third face and a fourth face;
• a third glass substrate having a fifth face and a sixth external face, the glazing unit constructed such that when the glazing unit is mounted in a leaf and when the leaf is in a closed position the sixth external face is in contact with an inside of an insulated enclosure and the first external face is in contact with an external environment, the second glass substrate being disposed between the first and third glass substrates;
• at least one spacer of low thermal conductivity retaining the substrates being in separation from one another, a first airspace being defined between the first and second glass substrates and a second airspace being defined between the second the third glass substrates;
• a low-E coating on at least one of the second face or fourth face of the glazing unit;
• at least one of the first and second airspaces being filled with at least one rare gas;
• and
• an anti-frost coating being deposited on at least part of the sixth external face, wherein,
• the thickness of the glass substrates being between 2 and 5 mm;
• a thickness of each of the first and second air spaces being at least 4 mm;
• the glazing unit having a thermal conductivity coefficient U of less than 1.1 W/m2.K with a gas filling of at least 85%;
• and
• the glazing unit having a light transmission of at least 67% and an external light reflection of less than 18%.

A refrigerated enclosure having a leaf movably mounted to the enclosure, the leaf comprising an insulating glazing unit having:

• at least first and second glass substrates, the first glass substrate having a first external face and a second face, the second glass substrate having a third face and fourth external face, the glazing unit is constructed such that when the leaf is in a closed position the first external face is exposed to an external environment and the fourth external face is in contact with an environment inside the refrigerated enclosure;
• at least one spacer of low thermal conductivity retaining the first and second glass substrates spaced apart, the spacer having a thermal conductivity of less than 1 W/m.K;
• a low-E (low-emissivity) coating at least partly on a face of at least one of the glass substrates;
• and
• an anti-frost coating on at least part of the fourth external face, wherein,
• an airspace defined between the first and second substrates is filled with at least one rare gas;
• the glazing unit contains no heating element;
• the glazing unit has a thermal conductivity coefficient U of less than 1.2 W/m2.K with a gas filling of at least 85%;
• and
• the glazing unit has a light transmission of at least 67% and a light reflection of less than 18%.