[esp-r] Re: The position of low-e coating in double glass.

[Geissler Achim]

Hi Young-Sub An,

 

I do not quite understand what you are doing, however, here are some
thoughts:

 

  - if you are not modeling the double glass as a zone, the low-e in the
glass cavity has no influence. The U-value of the glass is approximated by
adapting the thermal resistance of the glazing gap air.

  - the external emissivity of the double glass (pos. 1 and 4) actually
used in the simulation can be checked in the construction file (.con):

 

# for each surface: inside face emissivity

 0.22000,0.99000,0.22000,0.99000,0.90000,0.90000,0.22000

# for each surface: outside face emissivity

 0.22000,0.83700,0.22000,0.99000,0.90000,0.90000,0.22000

 

(where “surface” actually should read “construction”).

 

My experience is that if the correct value is set here, there are feasible
differences in the calculation results.

 

Regards,

Achim

 

 

 

 

  _____  

From: esp-r-bounces at lists.strath.ac.uk [mailto:esp-r-
bounces at lists.strath.ac.uk] On Behalf Of ????
Sent: Sunday, December 10, 2006 12:12 PM
To: esp-r at lists.strath.ac.uk
Subject: [esp-r] The position of low-e coating in double glass.

 


Dear esp-r user

 

I analyzed surface temperature according to position of low-e coating in
double glass. 

But, I find out the result that can't understand. 

The result of surface temperature is the very same case1 and case4, case2
and case3. 

guess that ESP-r program appear number① value of emissivity int and
number④ value of emissivity ext  regardless of glass. 

Please, solve the problem. 

Thank you. 

 

Sincerely 

Young-Sub An

----------------------------------------------------------------------------
-----------

Case 1. -> Low-e coating is applied to number④ of glass surface. 

Case 2. -> Low-e coating is applied to number③ of glass surface. 

        To apply on number③ of glass surface changes the emissivity value. 

Case 3. -> Low-e coating is applied to number① of glass surface. 

        To apply on number① of glass surface inverts glass(dlow24) of case
1. 

Case 4. -> Low-e coating is applied to number② of glass surface. 

        To apply on number② of glass surface changes the emissivity value. 

 

  <file:///F:\esp-r%20question\Case1,%202.jpg> 

  <file:///F:\esp-r%20question\Case3,%204.jpg> 




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