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Re: [EnergyPlus_Support] Re: Main Branch Cooling Coil and Heating Coil Control Nodes
But if you are using SET POINT MANAGER:MIXED AIR to only control the
outside
air dampers in an outside air economizer, you would not need a
temperature setpoint
on the mixed air node for 100% outside air. If the setpoint manager is
being used to
control other components as well, then you will still need it, as
Richard says.
Fred Buhl
Richard Raustad wrote:
> From the Eng. Ref. for Set Point Managers:
>
>
>MIXED AIR
>
>
>The mixed air set point manager takes an already established set point
>(usually the supply air outlet node set point temperature), subtracts
>the supply fan heat gain, and applies the result as the set point
>temperature at the mixed air node (or any other node the user specifies).
>
>So yes, if you want to control equipment to a set point and include fan
>heat, you will need to use the Set Point Manager:Mixed Air object.
>
>
>
>Elmer Morrissey wrote:
>
>
>
>>Hi Mike,
>>
>>Thank yoiu for your prompt answer. Just so I know for future systems,
>>do you have to use the SET POINT MANAGER:MIXED AIR even though the
>>system is set up to take 100% fresh air?
>>
>>Kind regards
>>
>>-Elmer
>>
>>--- In EnergyPlus_Support@xxxxxxxxxxxxxxx, "Michael J. Witte"
>><mjwitte@...> wrote:
>>
>>
>>>EnergyPlus controllers all have a finite control tolerance
>>>
>>>
>>(specified in the
>>
>>
>>>controller object), so the control is not perfect. My guess is that
>>>
>>>
>>the
>>
>>
>>>heating and cooling coil controllers are battling each other.
>>>
>>>If I understand your application correctly, SET POINT MANAGER:SINGLE
>>>
>>>
>>ZONE
>>
>>
>>>HEATING and SET POINT MANAGER:SINGLE ZONE COOLING can be used to
>>>
>>>
>>control your
>>
>>
>>>system.
>>>
>>>Move the heating coil to be after the fan and place the SET POINT
>>>MANAGER:SINGLE ZONE HEATING setpoint on the heating coil outlet node.
>>>
>>>Place the SET POINT MANAGER:SINGLE ZONE COOLING setpoint on the fan
>>>
>>>
>>outlet node
>>
>>
>>>and use a SET POINT MANAGER:MIXED AIR to place a setopint minus fan
>>>
>>>
>>heat
>>
>>
>>>correction on the cooling coil outlet node.
>>>
>>>Mike
>>>
>>>
>>>On 27 Feb 2006 at 15:55, Elmer Morrissey wrote:
>>>
>>>
>>>
>>>>Hello all,
>>>>
>>>>I am getting max iterations on a loop and I'm trying to go through
>>>>the file iteratively to locate the source of the problem (node
>>>>connections, correct flowrates etc).
>>>>
>>>>A brief description of the system I am trying to emulate:
>>>>
>>>>I have a fixed flow system. The AHU takes full fresh air before
>>>>entering a cooling coil, a heating coil and a supply fan (no
>>>>reheat). The temperature leaving the supply fan is varied according
>>>>to zone temperature.
>>>>
>>>>What I have done:
>>>>
>>>>I have two Controller:simple objects which both use the same control
>>>>node (the supply fan outlet node). I have set this at 18oC. However,
>>>>I would prefer to let EnergyPlus decide what the setpoint should be.
>>>>
>>>>Could this be the source of my problems?
>>>>
>>>>Kind regards
>>>>
>>>>-Elmer
>>>>
>>>>
>>>>
>>>>
>>>>
>>>>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 not allowed -- please post any files to the
>>>>
>>>>
>>appropriate folder
>>
>>
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>>>>
>>>>EnergyPlus Documentation is searchable. Open EPlusMainMenu.idf
>>>>
>>>>
>>and press the
>>
>>
>>>>"search" button.
>>>>
>>>>Yahoo! Groups Links
>>>>
>>>>
>>>>
>>>>
>>>>
>>>>
>>>>
>>>>
>>>>
>>>>
>>>========================================================
>>>Michael J. Witte, GARD Analytics, Inc.
>>>EnergyPlus Testing and Support
>>>EnergyPlus-Support@...
>>>
>>>
>>>
>>
>>
>>
>>
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