maybe you can use the 'view factor to sky'. but I think you can't switch this value. > -----Original Message----- > From: RENZI Virginie 217644 [mailto:virginie.renzi@cea.fr] > Sent: Thursday, October 16, 2008 10:25 AM > To: Jens Apel; LEPRINCE Valérie > Cc: trnsys-users@engr.wisc.edu > Subject: Re: [TRNSYS-users] Blinders for long-wave radiative exchange > > >