This happens all the time. Low temperature radiant systems cannot really provide all that high of a cooling rate. The system’s capacity is limited because the surface area can only be so large and the available temperature difference is limited because you don’t want condensation.
From: EnergyPlus_Support@xxxxxxxxxxxxxxx [mailto:EnergyPlus_Support@xxxxxxxxxxxxxxx] On Behalf Of luke_dorna
Sent: Friday, March 02, 2012 9:28 AM
To: EnergyPlus_Support@xxxxxxxxxxxxxxx
Subject: [EnergyPlus_Support] Low Temperature Radiant Cooling Won't Meet Loads
All,
I am currently modeling a low temperature variable volume radiant system with constant volume displacement ventilation. The DV system is delivering 65 degree air. The radiant system is completely autosized. Also, it's attached to district heat and cooling so the plant sizing is not an issue.
The system is meeting the loads in the winter, but not able to keep up with the loads in the summer. Has anyone run into something similar or have some rules of thumb regarding radiant systems that I may be overlooking? I'm just not sure how an autosized system is not meeting the load, especially when hooked up to a "limitless" district system.
Thanks,
Luke
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