[esp-r] Re: esp-r Digest, Vol 13, Issue 10 HELP - Ploycarb/Perspex

[Geissler Achim]

Hi George,
the IGDB (Window, LBNL) has a few entries e.g. on "Lexan(R)". You could build together whatever you need from that, possibly.
Best regards,
Achim


 
Mit freundlichen Grüssen / Best regards
 
Achim Geissler
> -----Original Message-----
> From: esp-r-bounces at lists.strath.ac.uk [mailto:esp-r-
> bounces at lists.strath.ac.uk] On Behalf Of George Wallis
> Sent: Tuesday, August 28, 2007 7:32 PM
> To: esp-r at lists.strath.ac.uk
> Subject: [esp-r] Re: esp-r Digest, Vol 13, Issue 10 HELP -
> Ploycarb/Perspex
> 
> Are there any values available for double thickness polycarb, such as
> would
> be used in a large greenhouse?
> 
> Regards
> 
> George
> 
> -----Original Message-----
> From: esp-r-bounces at lists.strath.ac.uk
> [mailto:esp-r-bounces at lists.strath.ac.uk] On Behalf Of
> esp-r-request at lists.strath.ac.uk
> Sent: 22 August 2007 12:00
> To: esp-r at lists.strath.ac.uk
> Subject: esp-r Digest, Vol 13, Issue 10
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> Today's Topics:
> 
>    1.  Types of glass (Ing Liang Wong)
>    2. Re: Types of glass (Jon Hand (clcv10))
> 
> 
> ----------------------------------------------------------------------
> 
> Message: 1
> Date: Wed, 22 Aug 2007 10:21:44 +0100
> From: "Ing Liang Wong" <ing.wong at ulster.ac.uk>
> Subject: [esp-r]  Types of glass
> To: <esp-r at lists.strath.ac.uk>
> Message-ID: <000d01c7e49d$dc235550$19873dc1 at wongcst>
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> 
> Dear all,
> 
> I have a look at the types of glass and optical properties of the
> double-glazing (6-12-6mm) in ESP-r database and have a few questions.
> 
> The absorptions at the external and internal clear float glass layers are
> taken from DCF7671_06nb, which appear to be:
> 0.157 0.172 0.185 0.201 0.202
> 0.117 0.124 0.127 0.112 0.077
> 
> 1) Why are these values be so different, given the internal and external
> have the same thickness (both are 6mm thick)?
> 
> 2) What are the type of glass used for double glazing? In construction
> database, plate glass has been used for the double-glazed windows; however,
> the optical properties are for clear float glass with vis transmittance of
> 0.76.
> 
> Regards,
> Wong
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> Message: 2
> Date: Wed, 22 Aug 2007 11:00:58 +0100
> From: "Jon Hand (clcv10)" <jon at esru.strath.ac.uk>
> Subject: [esp-r] Re: Types of glass
> To: "Ing Liang Wong" <ing.wong at ulster.ac.uk>
> Cc: esp-r at lists.strath.ac.uk
> Message-ID: <4D30ECF6-BBCB-4826-84E4-115AF6421C4B at esru.strath.ac.uk>
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> 
> A recent question about optical properties (outside and inside panes)
> 
> > The absorptions at the external and internal clear float glass
> > layers are taken from DCF7671_06nb, which appear to be:
> > 0.157 0.172 0.185 0.201 0.202
> > 0.117 0.124 0.127 0.112 0.077
> 
> The treatment of optical properties, as calculated by tools such as
> WIS and
> Window 5.2 and used by simulation tools such as ESP-r are based on
> absorption being calculated from the outside to the inside.
> 
> The absorption of an inner layer, is, by tradition, calculated
> "relative" to that of
> an outer layers.  Another way of saying this is if 100 units reach
> the outer glass
> and it absorbs 40 units any inside layers of glass can only know
> about the
> remaining 60 units rather than the initial 100 units.  The values
> seen in the
> optical database take this into account.
> 
> In ESP-r the thermophysical properties of glass are held separately from
> the optial properties of the glass.  A thermophysical material
> labeled as
> clear float might have a range of possible optical properties.  It is
> up to
> authors that define databases and the links between databases to ensure
> that the names of the entities are clear and the correct associations
> are defined.  It is certainly the case that some of the names that have
> been given to database entities are a bit opaque.  We are working
> towards
> allowing longer (and hopefully more expressive names).
> 
> -ESRU
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