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RE: [EnergyPlus_Support] Re: Low Temperature Radiant Cooling Won't Meet Loads
Another thing to check is the chilled ceiling construction. Make sure to have a high degree of heat transfer from the source to the zone - perhaps just a 3mm steel layer. Also provide insulation above the source so that cooling doesn't escape upwards.
Andy
Andy Tindale
DesignBuilder Software ltd
www.designbuilder.com
Tel: +44 (0)1453 755500
-----Original Message-----
From: EnergyPlus_Support@xxxxxxxxxxxxxxx [mailto:EnergyPlus_Support@xxxxxxxxxxxxxxx] On Behalf Of luke_dorna
Sent: 02 March 2012 17:20
To: EnergyPlus_Support@xxxxxxxxxxxxxxx
Subject: [EnergyPlus_Support] Re: Low Temperature Radiant Cooling Won't Meet Loads
I currently don't have the condensation control on, so the system should be happy to try and cool the space regardless of the condensation.
The output variables show the systems cooling energy is constantly below the internal loads of the space.
Is there some way to tell it to just go all out, or is the nature of the system limited?
--- In EnergyPlus_Support@xxxxxxxxxxxxxxx, "Griffith, Brent" <brent.griffith@...> wrote:
>
> 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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