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Hi all,

I’m trying to model a ventilated roof cavity, completely unconditioned, with a few openings (but tbc where and how big etc). Right now I’m testing a few different infiltration rates to see how the cavity temperature changes. But I’d also like account for the internal convection coefficient, which will change as a function of the air movement. I’m trying out the ASTMC1340 algorithm which should be a function of air speed (among others), but I can't figure out how to change this air speed parameter...

I'm currently trying

ZoneAirVelocity,
      Room1,
      0.2;

... but this doesn't seem to work. Any ideas?

Hi all,

I’m trying to model a ventilated roof cavity, completely unconditioned, with a few openings (but tbc where and how big etc). Right now I’m testing a few different infiltration rates to see how the cavity temperature changes. But I’d also like account for the internal convection coefficient, which will change as a function of the air movement. I’m trying out the ASTMC1340 algorithm which should be a function of air speed (among others), but I can't figure out how to change this air speed parameter...

I'm currently trying

ZoneAirVelocity,
      Room1,
      0.2;

... but this doesn't seem to work. Any ideas?

Hi all,

I’m trying to model a ventilated roof cavity, completely unconditioned, with a few openings (but tbc where and how big etc). Right now I’m testing a few different infiltration rates to see how the cavity temperature changes. But I’d also like account for the internal convection coefficient, which will change as a function of the air movement. I’m trying out the ASTMC1340 algorithm which should be a function of air speed (among others), but I can't figure out how to change this air speed parameter...

I'm currently trying

ZoneAirVelocity,
      Room1,
      0.2;

... but this doesn't seem to work. Any ideas?