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Basement Parking with Conditioned Core Spaces

asked 2014-11-22 01:02:30 -0500

dannyllim gravatar image

updated 2015-07-25 12:51:57 -0500

I am modeling a building with basement or below grade parking garage. In the core or middle of the parking area are conditioned spaces cooled by FCUs. Ventilation air to the basement is provided by fresh air supply fans and exhausted by fans. Jet fans provide air circulation directed towards the exhaust. Conditioned spaces draw supply air from outside the room thru inlet air louvers and cooled by the FCUs. CO sensors are provided to check the level of CO in the parking area. To model this in OS 1.5.2, I used an airloop with outdoor air system, supply fan, setpoint manager (follow outdoor air temperature), uncontrolled air terminal to introduce unconditioned air to the conditioned space/zone. With this set up, I am getting warnings shown below:

* Warning * GetAirPathData: AirLoopHVAC="FRESH AIR SUPPLY" has no Controllers.

My question is if my set up is correct and if yes, how to address the warning because I can't locate the controllers mentioned, or if it can be ignored. Thanks in advance.

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That may not be an issue, but to confirm, did you see fan power being used as expected when you run the simulation? If necessary you can always put on a setpoint manager, if you don't already have one.

David Goldwasser gravatar imageDavid Goldwasser ( 2015-03-31 00:34:30 -0500 )edit

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answered 2015-07-25 00:07:52 -0500

updated 2015-07-25 00:14:33 -0500

This is a warning that is meant to remind the user to use a Controller:WaterCoil object to manage the operation of a water coil. The AirloopHVC object has an input for a controller:

AirLoopHVAC,
  Typical Terminal Reheat 1,  !- Name
  ,                        !- Controller List Name

This input should not be blank if a water coil is used in the air loop, and that water coil needs to be controlled IF it is not part of a packaged system that can control the water coil. If a water coil sits on the air loop as a stand alone component, then the water coil needs a controller, otherwise a controller is not needed. So it depends on the system type whether or not a controller is needed.

This warning will not show up if these types of packaged system are used:

COILSYSTEM:COOLING:DX
COILSYSTEM:HEATING:DX
AIRLOOPHVAC:UNITARYSYSTEM
AIRLOOPHVAC:UNITARY:FURNACE:HEATONLY
AIRLOOPHVAC:UNITARY:FURNACE:HEATCOOL
AIRLOOPHVAC:UNITARYHEATONLY
AIRLOOPHVAC:UNITARYHEATCOOL
AIRLOOPHVAC:UNITARYHEATPUMP:AIRTOAIR
AIRLOOPHVAC:UNITARYHEATPUMP:WATERTOAIR
AIRLOOPHVAC:UNITARYHEATCOOL:VAVCHANGEOVERBYPASS
AIRLOOPHVAC:UNITARYHEATPUMP:AIRTOAIR:MULTISPEED

The issue here is if you have correctly specified the necessary inputs or if the program needs to be revised to include other system types that are valid WITHOUT a water coil controller. If the simulation results show that the water coil is operating correctly, then you do not need a water coil controller and can disregard this warning. If the coil is not operating correctly, then add a water coil controller and verify correct operation.

Please advise if this warning is issued incorrectly and provide the configuration that cause this warning to inadvertently report.

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Asked: 2014-11-22 01:02:30 -0500

Seen: 428 times

Last updated: Jul 25 '15