Heat Transfer and Climatic Loads at Insulating Glass Units in Window Systems
The insulating glass units (IGU) are widely used at advanced and renovated buildings in order to reduce the
energy for heating and cooling. In contrast to the single or multilayer non-pressurized glass systems gage or vacuum pressure
occurs in the hermetised gas spaceinIGU and cause mechanical deformation of the glass panes. Those internal loads are
results of variations of the altitude, meteorological pressure and gas temperature according to the same at the process of
sealing. The gas temperature depends on the IGU configuration and varies with the climatic conditions. It is result of a
transient conjugate heat transfer, including radiation in solar and infrared wave length, thermal conduction in the solid parts
of IGU, convection in the hermetised gas space, indoor and outdoor environments. The study of these processes remains a
topical issue because of the variety of materials, coatings and construction solutions used in modern building envelopes.
Models and conceptions for numerical simulation of heat transfer at insulating window systems, in order to estimate their
thermal performance and internal loads at IGU as function of the meteorological conditionsare developed in the present
work. Computations and analyses of 3D temperature, fluid flow fields, thermal performances and maximal internal loads at
IGU in insulating window system are implemented.
Keywords- IGU, Window Systems, Thermal Loads, CFD, Conjugate Heat Transfer, Mathematical Modeling, Simulation