Total infrared radiation property measurements of diathermanous
films with a reflectometer.
Progress in this category includes a multilayer solar analysis to track the beam and diffuse radiation, a method to measure off-normal, beam and diffuse components of solar reflection and transmission for shade materials, methods to calculate off-normal solar optical properties of shading materials, net radiation models for venetian blinds and pleated drapes, a simple method to estimate longwave properties of shading layer materials and the development of a new heat balance approach allowing (a) evaluation of U-factor and SHGC for any combination of opaque and diathermanous layers, exposed to any environment, and (b) a one-equation model offering the potential of on-the-fly heat balance calculations in the context of a time-step analysis.
Calculating Centre- Glass Performance Indices of Windows with a Diathermanous Layer," ASHRAE Transactions, Vol.
At the same time we wish to develop a method that is general in the sense that any layer may be diathermanous.
Theory has been presented for quantifying all of the longwave radiant resistors for any combination of glazing and/or shading layers, any of which can be diathermanous.
Jump" resistors allow for airflow between layers and/or diathermanous layers.
The new methods are especially useful for the analysis of glazing systems used in combination with shading layers such as venetian blinds, curtains, roller blinds and insect screens because these devices are generally diathermanous by virtue of their openness.
Calculating Centre-Glass Performance Indices of Windows with a Diathermanous Layer," ASHRAE Transactions, Vol.
The first window is a generic triple glazing, while the second has a diathermanous center layer.
For fenestration without diathermanous layers, the calculation of standard window performance indices is relatively simple.
When the system includes a diathermanous layer, the thermal network becomes more complex, as shown in Figure 4.
The performance indices for any system of N-2 layers (1 being the indoors, N being the outdoors) that contains a single diathermanous layer located at i = k can be expressed in a generic form.