RE: [EnergyPlus_Support] how to simulate vacuum glass

I am not sure whether the space between the double pane glass window is really a vacuum, as the pressure created by vacuum on the glass would be quite high.

I know that moisture is excluded.

Because the surface temperature of the glass does not change much in between, you may compare the single thick. double pane and thrpple pane results, and see whether it is really significant.

Many double pane windows are now with build in adjustable horizontable blind. This may increase the temperature between the glass. The air may be vented in or out to suit the seasonal requirement.

This blind in between glass construction may be more suitable for naturally vented buildings in China.

I know this does not answer your question, and is just my thought on the subject of controlling solar radiation into the room.

Dr. Li

To: EnergyPlus_Support@xxxxxxxxxxxxxxx
From: brent.griffith@xxxxxxxx
Date: Thu, 23 Feb 2012 13:01:31 -0700
Subject: RE: [EnergyPlus_Support] how to simulate vacuum glass

One way is to model the vacuum gap using an equivalent ?gas? approach. The WindowMaterial:Gas object has Gas Type of ?Custom? and allows user to set the gas properties. If you already have the overall performance of the glazing assembly, you can use the WindowMaterial:SimpleGlazingSystem object and not do a layer-by-layer description.

From: EnergyPlus_Support@xxxxxxxxxxxxxxx [mailto:EnergyPlus_Support@xxxxxxxxxxxxxxx] On Behalf Of llyymmff
Sent: Thursday, February 23, 2012 8:06 AM
To: EnergyPlus_Support@xxxxxxxxxxxxxxx
Subject: [EnergyPlus_Support] how to simulate vacuum glass

Hello,
My problem is how to simulate a window of vacuum glass (two layers of glass + vacuum layer in the middle)
So I want to know how to input the parameter of the vacuum layer?

Thank you very much!

Best regards!

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