Re: [EnergyPlus_Support] how to fix the recurring errors

Thanks,

On Sat, Jun 30, 2012 at 4:36 PM, CleanTech Analytics <jeremiah@xxxxxxxxxxxxxxxxxxxxxx> wrote:

This is an indication that your cooling may be turning on during times when it is cold outside. Your building may be internal load dominate so this cooling could be necessary.

If you search the list there have been several recommendations for a fix to this including using an EMS script..
However the warnings that are not severe can be ignored, I suggest you do not worry about the possibility for coil freeze and continue with your model with the warning..

Jeremiah D. Crossett

CleanTech Analytics
503-688-8951

www.cleantechanalytics.com

This document may contain valuable information proprietary to CleanTech Analytics which is private and confidential. It may not be shared, copied, stored or transmitted in any form without the prior written consent of CleanTech Analytics

On Sat, Jun 30, 2012 at 1:27 PM, Jia Hu <hujia06@xxxxxxxxx> wrote:

Hi,

I use example file generator and use package unit HVAC system provided by the example file generator. I got many following recurring error, how can I fix this? If necessary I can provide the IDF file. Thank you!

** Warning ** Coil:Cooling:DX:SingleSpeed "PSZ-AC_1:12:12_COOLC 1 DXCOIL" - Full load outlet air dry-bulb temperature < 2C. This indicates the possibility of coil frost/freeze. Outlet temperature = 1.94 C.

** ~~~ ** ...Occurrence info = LONDON/GATWICK - GBR IWEC Data WMO#=037760, 01/15 01:38 - 01:39
** ~~~ ** ... Possible reasons for low outlet air dry-bulb temperatures are: This DX coil

** ~~~ ** 1) may have a low inlet air dry-bulb temperature. Inlet air temperature = 15.542 C.
** ~~~ ** 2) may have a low air flow rate per watt of cooling capacity. Check inputs.
** ~~~ ** 3) is used as part of a HX assisted cooling coil which uses a high sensible effectiveness. Check inputs.

** Warning ** Coil:Cooling:DX:SingleSpeed "PSZ-AC_1:6:6_COOLC 1 DXCOIL" - Full load outlet air dry-bulb temperature < 2C. This indicates the possibility of coil frost/freeze. Outlet temperature = 1.94 C.

** ~~~ ** ...Occurrence info = LONDON/GATWICK - GBR IWEC Data WMO#=037760, 01/15 01:45 - 01:46
** ~~~ ** ... Possible reasons for low outlet air dry-bulb temperatures are: This DX coil

** ~~~ ** 1) may have a low inlet air dry-bulb temperature. Inlet air temperature = 15.542 C.
** ~~~ ** 2) may have a low air flow rate per watt of cooling capacity. Check inputs.
** ~~~ ** 3) is used as part of a HX assisted cooling coil which uses a high sensible effectiveness. Check inputs.

** Warning ** Coil:Cooling:DX:SingleSpeed "PSZ-AC_1:3:3_COOLC 1 DXCOIL" - Full load outlet air dry-bulb temperature < 2C. This indicates the possibility of coil frost/freeze. Outlet temperature = 1.66 C.

** ~~~ ** ...Occurrence info = LONDON/GATWICK - GBR IWEC Data WMO#=037760, 01/15 03:18 - 03:19
** ~~~ ** ... Possible reasons for low outlet air dry-bulb temperatures are: This DX coil

** ~~~ ** 1) may have a low inlet air dry-bulb temperature. Inlet air temperature = 15.556 C.
** ~~~ ** 2) may have a low air flow rate per watt of cooling capacity. Check inputs.
** ~~~ ** 3) is used as part of a HX assisted cooling coil which uses a high sensible effectiveness. Check inputs.