RE: [EnergyPlus_Support] Total Building Sensible and Latent Energy

Hey everyone,

I know it’s been a while, but going over this subject again, does anyone know how I can get the annual sensible heat ratio (sensible load/total load) of a building (typical is around 0.7)? I’m trying to study the building’s characteristics through infiltration, occupancy, and solar gains.

Thanks,

Michael Grant, MIT

Engineering | Systemair Inc.

(T) 1-506-743-9500

michael.grant@xxxxxxxxxxxxx

http://www.systemair.net

From: EnergyPlus_Support@xxxxxxxxxxxxxxx [mailto:EnergyPlus_Support@xxxxxxxxxxxxxxx] On Behalf Of Richard Raustad
Sent: April-29-11 10:41 AM
To: EnergyPlus_Support@xxxxxxxxxxxxxxx
Subject: Re: [EnergyPlus_Support] Total Building Sensible and Latent Energy

I don't know of any report variables that provide actual total or latent energy provided to the zone. Those existing report variables are related only to sensible energy provided to the zone and includes more than what comes through the zone inlet nodes (e.g. baseboards, room dehumidifiers, etc.). Also remember that these report variables are only related to the "load" when the thermostat set point is met (i.e., if you provide more or less sensible capacity to a zone than is required to meet the set point, it's not really the load). The "load" related to both the thermostat and humidistat set points can be viewed using:

When a zone thermostat is present:
HVAC,Average,Zone/Sys Sensible Load Predicted [W]
HVAC,Average,Zone/Sys Sensible Load to Heating Setpoint Predicted [W]
HVAC,Average,Zone/Sys Sensible Load to Cooling Setpoint Predicted [W]

When a zone humidistat is present:
HVAC,Average,Zone/Sys Moisture Load Rate Predicted [kgWater/s]
HVAC,Average,Zone/Sys Moisture Load Rate Predicted to humidifying setpoint [kgWater/s]
HVAC,Average,Zone/Sys Moisture Load Rate Predicted to dehumidifying setpoint [kgWater/s]

On 4/29/2011 8:24 AM, Michael Grant wrote:

Hey everyone,

Is there a place in a model where I can have energy plus spit out a building’s total sensible and latent load?

Is my only option under “Output:Variable,*,Zone/Sys Sensible Cooling Rate,hourly;” and “Output:Variable,*,Zone/Sys Sensible Heating Rate,hourly;” ?

Thanks,

Michael Grant, MIT

Engineering | Systemair Inc.

(T) 1-506-743-9500

michael.grant@xxxxxxxxxxxxx

http://www.systemair.net

--

Richard A. Raustad

Senior Research Engineer

Florida Solar Energy Center

University of Central Florida

1679 Clearlake Road

Cocoa, FL  32922-5703

Phone:   (321) 638-1454

Fax:     (321) 638-1439 or 1010

Visit our web site at: http://www.fsec.ucf.edu

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