Whether you call it a AHU or a zone fan coil unit depends on the capacity. If you have a gym with many people, it will be an air system with many diffusers, although there are no seperate zones.
The old fashioned thermostat master zone controlled AHU is what you need.
I think there is example file for this, although I am not very sure now, as many of the 5Zone examples have been converted to setpoint control of the AHU.
The system should have Type 4 theremostat with economiser function at the OA controller. OA flow rate can be linked to the people occupancy schedule and the minimum air valuevalue. So, no people, low air flow, or shut down altogether..
Dr. Li
To: EnergyPlus_Support@xxxxxxxxxxxxxxx
From: matthew.sverre.anderson@xxxxxxxxx
Date: Thu, 16 Aug 2012 22:07:38 +0000
Subject: [EnergyPlus_Support] Heating and Cooling Coil Control
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The old fashioned thermostat master zone controlled AHU is what you need.
I think there is example file for this, although I am not very sure now, as many of the 5Zone examples have been converted to setpoint control of the AHU.
The system should have Type 4 theremostat with economiser function at the OA controller. OA flow rate can be linked to the people occupancy schedule and the minimum air valuevalue. So, no people, low air flow, or shut down altogether..
Dr. Li
To: EnergyPlus_Support@xxxxxxxxxxxxxxx
From: matthew.sverre.anderson@xxxxxxxxx
Date: Thu, 16 Aug 2012 22:07:38 +0000
Subject: [EnergyPlus_Support] Heating and Cooling Coil Control
Hey Everybody,
So I currently have a zone which is controlled by a single air handler. The physical mechanics of the system are this:
(Economizer) -> Fan -> Heating Coil -> Cooling Coil -> Zone
Both the Heating Coil and Cooling Coil are on district plants. The system itself is a single zone CAV system.
What would be the best way to go about modeling/organizing this?
The HVACTemplate:System:VAV does not have the ability to list the coil as anything but electric/gas (for obvious reasons) or I could list it as a reheat coil and attempt to reorganize the nodes later. My first attempt was to list it as a reheat coil then reorganize the nodes, but it led to this question.
How would I organize the controls, without using a schedule, so that the heating coil water massflow rates drop to zero when no heating is required and the chilled water mass flow rates drop to zero when no cooling is required?
I currently have a mixed air set point scheduled at the fan outlet to control the economizer (is there a better way to do this to get maximum cooling out of the economizer?) but where can I put a setpoint in the SetpointManager(and what kind) combined with the ThermostatSetpoint:DualSetpoint (which is what the HVACTemplate expands to in the expidf) to add intelligence to the control layout. Currently I have the VAV airflow % set to 100% so it is a CAV system but I need to model the coil flow like what you would get with control valves on there that shut down when they are not needed and I seem to be spinning my wheels with this particular layout.
The big problem with this building is that it is a gym so during cooling months we will always need to cool but during heating months we might need to heat and we might need to cool depending on the occupancy.
So I currently have a zone which is controlled by a single air handler. The physical mechanics of the system are this:
(Economizer) -> Fan -> Heating Coil -> Cooling Coil -> Zone
Both the Heating Coil and Cooling Coil are on district plants. The system itself is a single zone CAV system.
What would be the best way to go about modeling/organizing this?
The HVACTemplate:System:VAV does not have the ability to list the coil as anything but electric/gas (for obvious reasons) or I could list it as a reheat coil and attempt to reorganize the nodes later. My first attempt was to list it as a reheat coil then reorganize the nodes, but it led to this question.
How would I organize the controls, without using a schedule, so that the heating coil water massflow rates drop to zero when no heating is required and the chilled water mass flow rates drop to zero when no cooling is required?
I currently have a mixed air set point scheduled at the fan outlet to control the economizer (is there a better way to do this to get maximum cooling out of the economizer?) but where can I put a setpoint in the SetpointManager(and what kind) combined with the ThermostatSetpoint:DualSetpoint (which is what the HVACTemplate expands to in the expidf) to add intelligence to the control layout. Currently I have the VAV airflow % set to 100% so it is a CAV system but I need to model the coil flow like what you would get with control valves on there that shut down when they are not needed and I seem to be spinning my wheels with this particular layout.
The big problem with this building is that it is a gym so during cooling months we will always need to cool but during heating months we might need to heat and we might need to cool depending on the occupancy.
__._,_.___
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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