Double Glazing Unit Research Articles

Energy recovery using ventilated double glazing

In a heated building, the outflow of some heat energy through windows is inevitable and can be a waste. It is possible to recover some of this heat loss by directing ventilation fresh air along the surface of the window. A modified double glazing unit with ventilation passage has been used to investigate the reduced heat losses with various flow rates and temperature differences. It was found that the heat losses through the external pane of the double glazing with inward flow ventilation constituted only a fraction of the total heat losses through the internal pane. Comparisons therefore with the heat losses through unventilated double glazing show that a significant reduction in heat losses could be achieved.

Low emissivity coatings for the improvement of the insulation properties of double-glazing units

Low emissivity coatings for the improvement of the insulation properties of double-glazing units

Measurement of the frost point of air in sealed insulating glass

This paper describes the aims and results of recent cooperative research by the National Bureau of Standards (NBS) and the American Society of Testing and Materials (ASTM). The research programme concerned the development of methods of testing, and standards to be adopted, for factory-produced sealed double glazing units. These must comprise an air-tight space between two (or more) sheets of glass in order to reduce the flow of heat through the window, while at the same time there must be provision for avoiding condensation of water on the inner surfaces of the glass, during construction and use. In addition to the reduction of visibility, repeated condensation of liquid water or of ice, and subsequent evaporation, tends to leave a residue on the glass surfaces, which are not accessible for cleaning. An apparatus is described for non-destructive testing of the air space inside hermetically sealed assemblies (US Patent 3. 89. 658); the test is repeatable from at least 273.8K to the dew or frost point. The references and standards established by the ASTM are given and described (ASTM designations: E546-75, E576-76, E6P, E6P2, and E6P3).

The effectiveness of moisture absorbents in double-glazing units

The effectiveness of moisture absorbents in double-glazing units

Some parameters of high-temperature copper spraying onto flat glass in the manufacture of sealed double-glazing units

Some parameters of high-temperature copper spraying onto flat glass in the manufacture of sealed double-glazing units