Re: [EnergyPlus_Support] Reverse Action Terminal Unit Damper

[Fred Buhl <wfbuhl@xxxxxxx>]

Currently no - the reverse action damper first increases hot water flow 
as much
as possible (thus increasing the air leaving temperature), then if the 
load is not met,
increases the air flow rate. There is a priority development item to 
make the terminal
unit control to a maximum  leaving temperature.

Fred Buhl

michaelirosenberg wrote:
> I am doing some testing to determine savings associated with normal 
> action vs reverse action VAV reheat terminal unit damper control. I 
> have sized my zone heating design supply air temperature to 40 deg. C 
> (zone sizing) and my reheat coil leaving air temperature to 40 deg. C.
> (coil:water:simple heating)
>
> With a normal action terminal unit damper, my supply temperature out of 
> the terminal unit outlet node is 40 deg. C maximum. When I switch to 
> reverse action, my supply temperature out of the terminal unit outlet 
> node goes up to almost 60 deg. C. This is not how I thought it was 
> supposed to work, or what I want. I want to control the leaving air 
> temperature to 40 deg. C. and have the damper open to provide more air 
> at 40 deg. if needed to meet heating load. Is there a way to get this 
> to perform as I wish? 
>
>
>
>
> ------------------------------------
>
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------------------------------------

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