Dear E+ users,
I am simulating a system that is based on
the HVACTemplate:Zone:Unitary. The airflow rates and capacity of the system are
set to autosize. I ran an annual simulation and I found out that the zone mean
air temperatures are floating (like there is no air conditioning operating) for
a Brazilian climate weather file. When I ran the same building using the weather
file of Chicago , everything works fine. Besides, for the simulation with the
Brazilian weather file, I got the following warning message:
** Warning ** Coil:Cooling:DX:SingleSpeed
"SPLIT-4 COOLING COIL" - Full load outlet air dry-bulb temperature
< 2C. This indicates the possibility of coil frost/freeze. Outlet
temperature = -3.45 C.
** ~~~
** ...Occurrence info = ANUAL, 05/19 07:10 - 07:11
** ~~~
** ... 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 = 11.701 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.
Is it possible that this warning is related
to the problem of no temperature control? If you can give any hint where the
problem is , I will highly appreciated.
Regards,
Alberto
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