Reducing Canadian Greenhouse energy costs using highly insulating glazing

Abstract

This study explores the potential to significantly reduce heating costs in northern climates by adding additional layers and types of glazing to simulate greenhouse-like structures with highly insulating roofs that still allow appreciable light transmission. Representative typical meteorological year (TMY) data are used with a one-dimensional multilayer heat transfer model to explore the potential of insulated glazing panels for increasing solar gain. The model was validated against interior temperature and exterior weather data collected at a small unheated greenhouse in winter conditions. It was found that it is possible to reduce winter heating energy costs by using thicker-than-normal insulated glazing, although in practice, energy savings will be offset by added costs of the insulated glazing and additional measures would be needed to minimize summer heat gain. However, the potential for reducing winter heating energy costs suggests potential for highly insulating, semitransparent cladding.