[Date Prev][Date Next][Thread Prev][Thread Next][Date Index][Thread Index]
[EnergyPlus_Support] Re: Output Variable to Calculate the Zone Load Requirements
Thank you very much for the responce prof. Raustad.
So if my understanding is correct the Zone/Sys Sensible Cooling & Heating Energy can be used to calculate the direct energy impacts of a system in a zone(for example the energy effects of a shading system)without taking into account the wheather conditions. The direct effects of a "measure" (shading, U-Value,Glazing type, etc) on a system-zone level and not on a complete whole building/space analysis.
In an energy simulation where the target is to calculate the energy loads on a whole building scale, the climate is an important factor and should be taken into account. The Ideal Load total or zone total Heating and Cooling should be requested.
--- In EnergyPlus_Support@xxxxxxxxxxxxxxx, Richard Raustad <RRaustad@...> wrote:
>
> One of the best ways to understand this is to report the zone temp,
> humidity ratio, and enthalpy along with the zone inlet node temp,
> humidity ratio, and enthalpy. Also report the zone inlet node mass flow
> rate.
>
> You can then calculate the zone energy entering the zone through the
> zone inlet node. Q = Mdot(deltaH)
>
> Zone/Sys Sensible Cooling or Heating Energy only report what enters the
> zone through the zone inlet node. It does not include any effects of
> outdoor air or fan heat.
>
> The ideal loads total heating and ideal loads zone total heating show
> the same value and is an enthalpic calculation (includes impact of
> moisture difference between zone inlet node and zone node), the ideal
> loads sensible variables only show the impact of temperature difference
> between the zone inlet node and zone node.
>
> It depends on what your goal is as to which report variables to use. Do
> you want to know the energy impacts of outdoor air? Or just the energy
> required to meet the standard zone loads?
>
> On 10/4/2012 1:53 AM, kontadakisantonios wrote:
> > Hello,
> > I usually use a HVACTemplate:Zone:IdealLoadsAirSystem in order to calculte the annual requirements for heating and cooling of a zone.
> > In the Output:Variable there are several variables from which you can take the Energy loads:
> >
> > #A#"Zone/Sys Sensible Cooling Energy" & :Zone/Sys Sensible Heating Energy";
> >
> > #B1# "Ideal Loads Total Heating Energy" & "Ideal Loads Total Cooling Energy";
> > #B2# "Ideal Loads Sensible Cooling Energy" & "Ideal Loads Sensible Heating Energy"
> >
> > #C1# "Ideal Loads Zone Total Heating Energy" & "Ideal Loads Zone Total Cooling Energy"
> > #C2# "Ideal Loads Zone Sensible Heating Energy" & "Ideal Loads Zone Sensible Cooling Energy"
> >
> > Those three output sets give different Annual/Summary loads (J), for example in an South oriented office room of 18.36 m2 located in Athens-Greece the annual loads for heating and cooling are:
> > #A# Zone/Sys Sensible_Heating=324957402J, Cooling= 3557071988J
> > #B1# IdealLoads Total_ Heating=404805597.1J, Cooling=4261318764J
> > #B2# IdealLoads Sensible_Heating=326646181.2J, Cooling=3562938318J
> > #C1# IdealLoads Zone Total_Heating=404807810.5J, Cooling=4261320977J
> > #C2# IdealLoads Zone Sensible_Heating=326645932.9J, Cooling=3562934397J
> >
> > The main question is:
> > "In order to calculate the annual or monthly requirements of a space for heating and cooling when using an ideal Load HVAC System which output set i request?"
> > Please if possible explain the difference between the output viarable sets and when we use them.
> >
> > Any help to better understand E+ would be appreciated
> > Thank you in advance very much
> > Antonis.
> >
> >
> >
> > ------------------------------------
> >
> > Primary EnergyPlus support is found at:
> > http://energyplus.helpserve.com or send a message to energyplus-support@...
> >
> > 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 currently allowed but be mindful that not everyone has a high speed connection. Limit attachments to small files.
> >
> > EnergyPlus Documentation is searchable. Open EPlusMainMenu.pdf under the Documentation link and press the "search" button.
> > Yahoo! Groups Links
> >
> >
> >
> >
>
> --
> 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
>
> UCF - From Promise to Prominence: Celebrating 40 Years
>
------------------------------------
Primary EnergyPlus support is found at:
http://energyplus.helpserve.com or send a message to energyplus-support@xxxxxxxx
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 currently allowed but be mindful that not everyone has a high speed connection. Limit attachments to small files.
EnergyPlus Documentation is searchable. Open EPlusMainMenu.pdf under the Documentation link and press the "search" button.
Yahoo! Groups Links
<*> To visit your group on the web, go to:
http://groups.yahoo.com/group/EnergyPlus_Support/
<*> Your email settings:
Individual Email | Traditional
<*> To change settings online go to:
http://groups.yahoo.com/group/EnergyPlus_Support/join
(Yahoo! ID required)
<*> To change settings via email:
EnergyPlus_Support-digest@xxxxxxxxxxxxxxx
EnergyPlus_Support-fullfeatured@xxxxxxxxxxxxxxx
<*> To unsubscribe from this group, send an email to:
EnergyPlus_Support-unsubscribe@xxxxxxxxxxxxxxx
<*> Your use of Yahoo! Groups is subject to:
http://docs.yahoo.com/info/terms/