Jim,
I was simulating with the operative temperature as target.
Changing this to the air temperature solved the case. Otherwise the air temperature had to be lower than 0°C to achieve a operative temperature of 2°C.
Best Regards,
Geert Bellens
Van: EnergyPlus_Support@xxxxxxxxxxxxxxx [mailto:EnergyPlus_Support@xxxxxxxxxxxxxxx] Namens Jim Dirkes
Verzonden: 18 February 2013 01:08
Aan: EnergyPlus_Support@xxxxxxxxxxxxxxx
Onderwerp: RE: [EnergyPlus_Support] Lowest temperature for PTAC ..?
Geert,
You might want to use Refrigeration:Case and related objects – those are intended for cold chambres and the temperatures you mention.
James V Dirkes II, PE, BEMP, LEED AP
www.buildingperformanceteam.com
Energy Analysis, Commissioning & Training Services
1631 Acacia Drive, Grand Rapids, MI 49504 USA
616 450 8653
From: EnergyPlus_Support@xxxxxxxxxxxxxxx [mailto:EnergyPlus_Support@xxxxxxxxxxxxxxx] On Behalf Of Geert Bellens
Sent: Sunday, February 17, 2013 6:43 PM
To: EnergyPlus_Support@xxxxxxxxxxxxxxx
Subject: [EnergyPlus_Support] Lowest temperature for PTAC ..?
I'm simulating two simple zones with only cooling, no heating, no ventilation. In real life these zones are cold chambres for the meat industry with temperature 8°C and 2°C with their one split unit.
I just want to evaluate the difference in cooling energy when the building is better insulated.
Using a simple PTAC, I can cool these zones, but the lowest temperature seems to be 7°C. Can I go lower with a PTAC?
Is there maybe a better (and quick) way to cool these zones ?
Geert
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