Switchable glazing based on two criteria

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Hi all,

I'm having difficulty implementing glazing that switches based on both
direct solar incident and temperature. That is, I only want to allow
switching when the outside dry bulb is over 60 F, and I want the switch to
occur instantaneously when the glazing receives 15.9 BTU/hft^2 direct solar
incident radiation. I don't have experience with user expressions/if
statements in eQUEST. I've been successful in implementing switchable
glazing based only on temperature or only on direct solar incident, but not
on both.

I tried something along the lines of this for the window in *.inp, but
without success:

SWITCH-CONTROL = ({if (#G("DRY-BULB TEMP")>60)
GLASS-TYPE-SW = "ECW-switched"
then "DIR-SOL-INC"
else "NO-SWITCH"
endif})
SWITCH-SET-LO = 15.9
SWITCH-SET-HI = 15.9

Thanks in advance,

Adam

Adam Michael Aljets's picture
Joined: 2012-04-10
Reputation: 0

Hi

Unfortunately equest don't have the capability to use multiple triggers . .
You might want to try this in energy plus

DEEPIKA KHOWAL
Dkhowal's picture
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Joined: 2011-09-30
Reputation: 0

E+ has some functions to control switchable glazings, for your case I would try the control "OnIfHighOutdoorTempAndHighSolarOnWindow", which seems to fit pretty well to your requirements.

Stefano

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Stefano Moret

Stefano Moret's picture
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Joined: 2012-03-15
Reputation: 0