I have not been using the availability manager for some time, and I am not sure whether it can be linked into the object below:
! ----------- may end here for a simple one.
!- =========
Condition for Delta temperature:
IF ((IndoorTemp - OutdoorTemp) < DeltaTemperature) Then ventilation is not allowed.
=======.
Normally, the Vent schedule is a fixed one according to the season and time of day. If this schedule can be over written using a availability schedule manager, then the resultant schedule can be made to monitor the zone temperature. This is the question I asked in the forum mail.
If you leave the ventilation on all the time, the 18.0 Minimum indoor temperature would turn the ventilaton off, when the zone temperature is below this value. If you made this value 50.0 then the ventilation will not be on until the room temperature reaches 50°C. If the heating source is present after the ventilation is turned on then the temperature may rise but much slower, at low ventilation rate. By increasing the ventilation rate, the zone may be over cooled, and the ventilation air will modulate.
To use this object, there is no node connection or fan object to be added. The virtual fan power would be reported in the summary table and as a variable.
I have not tested the use of ventilation object in this mode.
Dr. Li
To: EnergyPlus_Support@xxxxxxxxxxxxxxx
From: marko.ignjatovic1980@xxxxxxxxx
Date: Wed, 5 Sep 2012 20:44:07 +0000
Subject: [EnergyPlus_Support] Re: Adding untreated outside air to a zone?
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Primary EnergyPlus support is found at:
http://energyplus.helpserve.com or send a message to energyplus-support@xxxxxxxx
The primary EnergyPlus web site is found at:
http://www.energyplus.gov
The group web site is:
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ZoneVentilation:DesignFlowRate,
Ventilation 1, !- Name
ZONE 2, !- Zone Name
VentSched, !- Schedule Name
Flow/Zone, !- Design Volume Flow Rate calculation method
6.131944, !- Design Volume Flow Rate {m3/s}
, !- Volume Flow Rate per area {m3/s/m2}
, !- Volume Flow Rate per person {m3/s/person}
, !- Air Changes Per Hour
INTAKE, !- Ventilation Type
400.0, !- Fan Pressure Rise{Pa}
0.9, !- Fan Total Efficiency
0.6060000 , !- Constant Term Coefficient
2.0199999E-02, !- Temperature Term Coefficient
5.9800001E-04, !- Velocity Term Coefficient
0.0000000E+00!- Velocity Squared Term Coefficient
18.0, !- Minimum Indoor Temperature {C}
, !- Minimum Indoor Temperature Schedule Name
, !- Maximum Indoor Temperature {C}
, !- Maximum Indoor Temperature Schedule Name
1.0, !- Delta temperature {C}! ----------- may end here for a simple one.
DeltaTemp, !- Delta Temperature Schedule Name
, !- Minimum Outdoor Temperature {C}
MinOutdoorTemp, !- Minimum Outdoor Temperature Schedule Name
, !- Maximum Outdoor Temperature {C}
MaxOutdoorTemp, !- Maximum Outdoor Temperature Schedule Name
40; !- Maximum WindSpeed {m/s}!- =========
Condition for Delta temperature:
IF ((IndoorTemp - OutdoorTemp) < DeltaTemperature) Then ventilation is not allowed.
=======.
Normally, the Vent schedule is a fixed one according to the season and time of day. If this schedule can be over written using a availability schedule manager, then the resultant schedule can be made to monitor the zone temperature. This is the question I asked in the forum mail.
If you leave the ventilation on all the time, the 18.0 Minimum indoor temperature would turn the ventilaton off, when the zone temperature is below this value. If you made this value 50.0 then the ventilation will not be on until the room temperature reaches 50°C. If the heating source is present after the ventilation is turned on then the temperature may rise but much slower, at low ventilation rate. By increasing the ventilation rate, the zone may be over cooled, and the ventilation air will modulate.
To use this object, there is no node connection or fan object to be added. The virtual fan power would be reported in the summary table and as a variable.
I have not tested the use of ventilation object in this mode.
Dr. Li
To: EnergyPlus_Support@xxxxxxxxxxxxxxx
From: marko.ignjatovic1980@xxxxxxxxx
Date: Wed, 5 Sep 2012 20:44:07 +0000
Subject: [EnergyPlus_Support] Re: Adding untreated outside air to a zone?
Dr Li,
I don't know whether You answered to my or the other post. Since I am beginner in EnergyPlus , a I am not familiar with night schedule and Your problem, but i checked several times. I modified previous deadband and set cooling setpoint above max temperature in the zone. Fan electric consumption was zero so it means it stayed off. When I lowered this setpoint only 1 oC bellow max temperature fan consumption occur and is significantly lower than in first scenario (setpoint 50oC). The way I see it it means that the fan operates only when temp is above the given setpoint. Whether the fan varies outside air volume or not, I haven't checked (is there a way to measure it by output:meter or variable object?).
--- In EnergyPlus_Support@xxxxxxxxxxxxxxx, YuanLu Li <yli006@...> wrote:
>
>
> I am thinking of a similar situation with night schedule. A server room is usually served with the main HVAC which is turned off at night. When the room temerature is above 30°C, the available manager schedule would turn on a wndow unit to cool it down. I wonder, if the ventilation object can be turned on in the similar way. Dr. Li
> To: EnergyPlus_Support@xxxxxxxxxxxxxxx
> From: jeannieboef@...
> Date: Wed, 5 Sep 2012 10:29:12 +0000
> Subject: [EnergyPlus_Support] Re: Adding untreated outside air to a zone?
>
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> I see your point. I hate to break it to you, but you'll have to delve into the wonderfull world of EMS to do this. It's maybe a bit daughnting, but worth it in the end and actually not that hard. The basic concept is to override schedule values based on logic as the simulation runs.
>
I don't know whether You answered to my or the other post. Since I am beginner in EnergyPlus , a I am not familiar with night schedule and Your problem, but i checked several times. I modified previous deadband and set cooling setpoint above max temperature in the zone. Fan electric consumption was zero so it means it stayed off. When I lowered this setpoint only 1 oC bellow max temperature fan consumption occur and is significantly lower than in first scenario (setpoint 50oC). The way I see it it means that the fan operates only when temp is above the given setpoint. Whether the fan varies outside air volume or not, I haven't checked (is there a way to measure it by output:meter or variable object?).
--- In EnergyPlus_Support@xxxxxxxxxxxxxxx, YuanLu Li <yli006@...> wrote:
>
>
> I am thinking of a similar situation with night schedule. A server room is usually served with the main HVAC which is turned off at night. When the room temerature is above 30°C, the available manager schedule would turn on a wndow unit to cool it down. I wonder, if the ventilation object can be turned on in the similar way. Dr. Li
> To: EnergyPlus_Support@xxxxxxxxxxxxxxx
> From: jeannieboef@...
> Date: Wed, 5 Sep 2012 10:29:12 +0000
> Subject: [EnergyPlus_Support] Re: Adding untreated outside air to a zone?
>
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> I see your point. I hate to break it to you, but you'll have to delve into the wonderfull world of EMS to do this. It's maybe a bit daughnting, but worth it in the end and actually not that hard. The basic concept is to override schedule values based on logic as the simulation runs.
>
__._,_.___
Primary EnergyPlus support is found at:
http://energyplus.helpserve.com or send a message to energyplus-support@xxxxxxxx
The primary EnergyPlus web site is found at:
http://www.energyplus.gov
The group web site is:
http://groups.yahoo.com/group/EnergyPlus_Support/
Attachments are currently allowed but be mindful that not everyone has a high speed connection. Limit attachments to small files.
EnergyPlus Documentation is searchable. Open EPlusMainMenu.pdf under the Documentation link and press the "search" button.
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