Re: [EnergyPlus_Support] RE: EnergyPlus humidification control

ducted return would be negligable. at a duct speed of 4m/s...

Q=VA so for worst case DN100 pipe that's = 4 x 0.00785 = 0.0314 m3/s = 113 m3/h

if you had a 3 W LED spot every meter...

E=0.35*Q(in m3/h)*dT

so dT=0.075 Kelvin

and that would be like having the light sitting in the pipe!

with old lights (halogen spots) at 25 W per spot, the same check would yield 0.63 K.

Jean

On Mon, 4 Mar 2019, 16:15 'Edward G. Lyon' eglyon@xxxxxxx [EnergyPlus_Support], <EnergyPlus_Support@xxxxxxxxxxxxxxx> wrote:

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If you had a return air plenum, some lighting and building load can be assigned to the plenum and reading that air RH would be shifted.Â The room conditions at a return node are a â??well-mixedâ?? condition for the room that is as close as you can get to a room condition.Â Displacement ventilation would be a wild card as I donâ??t know how latent loads get introduced.

Â

Ned Lyon, P.E. (MA, WV)
Staff Consultant

SIMPSON GUMPERTZ & HEGER
781.907.9000Â main
781.907.9350 directÂ
617.285.2162 mobileÂ
781.907.9009Â fax
www.sgh.com

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From: EnergyPlus_Support@xxxxxxxxxxxxxxx <EnergyPlus_Support@xxxxxxxxxxxxxxx>
Sent: Monday, March 4, 2019 8:34 AM
To: EnergyPlus_Support@xxxxxxxxxxxxxxx
Cc: Jim Dirks <jim@xxxxxxxxxx>
Subject: [EnergyPlus_Support] Re: EnergyPlus humidification control

Â

Â

Christopher,

The zone average %RH sounds like it would be pretty darn close to me. (closer by far than "not possible"). If the Baseline and Proposed models apply the same method, the comparison should be spot on, I think.Â

Â

From: EnergyPlus_Support@xxxxxxxxxxxxxxx <EnergyPlus_Support@xxxxxxxxxxxxxxx> on behalf of 'Jones, Christopher' christopher.r.jones@xxxxxxx [EnergyPlus_Support] <EnergyPlus_Support@xxxxxxxxxxxxxxx>
Sent: Monday, March 4, 2019 8:08 AM
To: EnergyPlus_Support@xxxxxxxxxxxxxxx
Cc: Jim Dirks
Subject: [EnergyPlus_Support] RE: EnergyPlus humidification control

Â

Â

Thank you Jim,

Given that the return air stream may include pick-up from the lights, would not the return RH be slightly less than the average zone RH? It likely wouldnâ??t be significant.

Â

Christopher R Jones, P.Eng.

T+ 1 416-644-0252

Â

Â

From: EnergyPlus_Support@xxxxxxxxxxxxxxx [mailto:EnergyPlus_Support@xxxxxxxxxxxxxxx]
Sent: Friday, February 15, 2019 4:57 PM
To: 'Jones, Christopher' christopher.r.jones@xxxxxxx [EnergyPlus_Support] <EnergyPlus_Support@xxxxxxxxxxxxxxx>
Subject: [EnergyPlus_Support] Re: EnergyPlus humidification control

Â

Â

Christopher,

I'd suggest that the modeler use:

Â - for a multiple zone system:Â SetpointManager:MultiZone:MinimumHumidity:AverageÂ

Â - for a single zone system:Â SetpointManager:SingleZone:Humidity:Minimum

Â

"Officially", E+ is not measuring humidity at the return air node, but it's doing effectively the sameÂ thing by determining the zone return air humidity.

From: EnergyPlus_Support@xxxxxxxxxxxxxxx <EnergyPlus_Support@xxxxxxxxxxxxxxx> on behalf of 'Jones, Christopher' christopher.r.jones@xxxxxxx [EnergyPlus_Support] <EnergyPlus_Support@xxxxxxxxxxxxxxx>
Sent: Friday, February 15, 2019 2:16 PM
To: EnergyPlus_Support@xxxxxxxxxxxxxxx
Subject: [EnergyPlus_Support] EnergyPlus humidification control

Â

Â

I am reviewing a LEED 2009 submission. The design sequence of operations calls for humidification to be controlled by measuring the return air stream RH. The modeler states that it is not possible for EnergyPlus v9.0 to model this control strategy. Is this the case? I am used to IES where it is possible with a few clicks.

Â

Christopher R Jones, P.Eng.

T+ 1 416-644-0252

Â

Â

Â

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