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RE: [EnergyPlus_Support] Problems with fancoil simulations

To: <EnergyPlus_Support@xxxxxxxxxxxxxxx>
Subject: RE: [EnergyPlus_Support] Problems with fancoil simulations
From: "Miguel Angel Pascual Buisan" <mapascual@xxxxxxxxx>
Date: Sun, 17 Dec 2006 10:49:55 +0100
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Thread-index: AccgZa0Gb7M2s1d5SfqNvuy8OBuAdABWkmnA

 

The problem was in the COIL:Water:Cooling=2E The ?Design Inlet Air Humidity
Ratio? was smaller than the ?Design Outlet Air Humidity Ratio? witch is
physically impossible=2E It seems that under this situation the cooling coil
was disabled without any warning or severe error=2E I would suggest a warning
under this situation=2E

 

Miguel Angel Pascual

 

 

 

  _____  

De: EnergyPlus_Support@yahoogroups=2Ecom
[mailto:EnergyPlus_Support@yahoogroups=2Ecom] En nombre de Pedro Rodrigo
Enviado el: viernes, 15 de diciembre de 2006 17:21
Para: Foro ENERGYPLUS
Asunto: [EnergyPlus_Support] Problems with fancoil simulations

 

Thank you Michael for your suggestions=2E
I have monitored coil operation with the report variables "Total Water
Heating Coil Rate" and "Total Water Cooling Coil Rate"=2E In a winter
simulation, when the system starts up (Monday, 8:00 AM) there is a quick
rise of heatring coil energy and afterwards energy returns to zero and
continues zero the entire simulation=2E The same energy curve occurs in a
summer simulation for the cooling coil rate=2E
Do you know how to explain this effect?

(I have changed thermostat controls to dual setpoint with deadband and the
same results were obtained)=2E

Pedro Manuel Rodrigo Cruz
Universidad de Jaén

Michael J=2E Witte wrote:

Thank you to Miguel for offering to review the input file=2E I have two 

suggestions: 

1=2E Be sure to read the definition of "Zone/Sys sensible heating rate" and 

"Zone/Sys sensible cooling rate" in the Input Output Reference=2E If the fan 

coils have outside air flow, "Zone/Sys sensible cooling rate" may not always


mean that the cooling coil is operating, it may just be cold outside air 

flowing into the zone=2E Note that fan coils in EnergyPlus run with continuous


fan whenever the unit is scheduled on=2E Add these report variables to monitor


coil operation:

Total Water Heating Coil Energy

Total Water Cooling Coil Energy

2=2E In version 1=2E4, changes were made to the fan coil unit controls to
provide 

better control at low load conditions when the outside air may need to be 

tempered=2E These controls rely on knowing both a heating and cooling
setpoint=2E 

I would recommend trying the dual setpoint with deadband thermostat controls


and let the heating and cooling coil schedules control the availability=2E 

Mike

On 11 Dec 2006 at 19:34, Pedro Rodrigo wrote:

> Hi all:

> I´m trying to model a two=2Dpipe fancoil system in a mono=2Dzone building
model=2E

> I´m using the "fancoilautosize" example as a reference=2E

> The "fancoilautosize" example uses a "fancoil unit:4 pipe" object, a
chilled

> water loop linked to the cooling coil and a hot water loop linked to the

> heating coil=2E I´m trying to modify the availability schedules in order to

> supply heating only in winter season and cooling only in summer season

> (cooling coil and chilled water loop must be off in winter =2D heating coil
and

> hot water loop must be off in summer)=2E

> I have launched weather file simulations and results reported in the
variables

> "Zone/Sys sensible heating rate" and "Zone/Sys sensible cooling rate" show

> that the system is supplying heating and cooling in both summer and winter

> seasons=2E The zone temperature (variable "Zone mean air temperature" ) does
not

> follow the zone setpoints=2E

> The following schedules have been used in my simulations:

> =2D FanAndCoilAvailSche d uses the same scheme for the hole year: it is ON
from

> 8:00 AM to 9:00 PM (Monday to Friday) and OFF on weekend=2E The same
schedule is

> used for the objects "fancoil unit:4 pipe", "fan:simple: const volume",

> "coil:water: cooling" and "coil:water: simpleHeating" =2E

> =2D The Zone Control Type Sched is set to 1 in winter season (single heating

> setpoint) and 2 in summer season (single cooling setpoint)=2E It is used in
the

> "zone control: thermostatic" object=2E

> =2D The chilled water loop operation scheme uses an Availability Schedule
that

> is OFF in winter season and ON in summer season=2E

> =2D The hot water loop operation scheme uses an Availability Schedule that
is ON

> in winter season and OFF in summer season=2E

> Does anybody know where is the problem?

> 

> 

> Pedro Manuel Rodrigo Cruz

> Universidad de Jaén 


______________________________________________ 
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- [EnergyPlus_Support] Problems with fancoil simulations
  - From: Pedro Rodrigo

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