[esp-r] Re: Shading vs visible transmission

[Achim.geissler]

    Dear Daisy     what you would need to do is the following:  1) Shading
coefficient refers to "behaviour in regard to solar gains", not visible
transmission. You take your shading coefficient and from this calculate the
SHGC (or g-value). See ASHRAE Fundamentals, e.g.  2) You choose a glass
product that achieves this g-value in Window (LBNL). Here, you can check if
you can find a glass product that also satisfies your visual transmittance
needs.  3) With this glass product you set up your insulating glazing unit
in Window and export (by whatever path you are comfortable with) to ESP-r
TMC or via GSLEdit to CFC.     Best   Achim  
--------- Original-Nachricht --------
 Von: "Íõ¾Õ»¨" 
 An: "esp-r at lists.strath.ac.uk" 
 Betreff: [esp-r]  Shading vs visible transmission
 Datum: 29/04/10 07:06
 
     Dear all,
      I have a question since I began to learn esp-r.There was an article
called "Setting Shading Coefficient for transparent constructions and double
facade" posed by my friend Teresa.Jon Hand kindly gave answer that  ESP-r
does not use a "shading coefficient" which is a ratio of a specific glazing
product to a 'standard single glazed window'.Please allow me to ask
further,what should I do if I want to set a Shading Coefficient,for
example,0.57£¬for the south window.I tried to multiply the visible
transmission of window by 0.57.But when I output results of dynamic
load,there is no change compared with the actural visible transmission
condition.I am thinking whether changing visible transmission just
influences lighting analysis results.
      I really don't know how to add  electric shading  louvers for
windows to reach a required Shading Coefficient of 0.57.I am using esp-r for
energy simulation of a green low carbon building.Anxiously looking forward
to your kind answers.Many thanks.Daisy.
 		 	   		  
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