Aone cooling and heating rates are reported in watts. How do you specify the area?
Heating panel of 25w/m2 means that the total power has to be multiplied by the area of the panel used. With stating the area of the panel or area of the zone, how do you make the comparison?
There is no tatal cooling rate per area for a year.
What is the heat and cold dissipation of a zone? The power required to heat or cool the zone to the thermostat set point temperature are Zone/Sys Sensible Heating Rate and Zone/Sys Sensible Cooling Rate. The unit is in watts. (In Boby's mail below.) Note that the value is hourly averaged power. If you turn on and off some equipment, the timestep values will follow the additiona load.
You need to state the outdoor temperature and zone mean temperature for comparison.
With 33°C ODT and 22°C zone mean temperature, a 20 m2 room would need about 500 watt to cool, (1 hp window unit, 746 watts) asuming that the building insulation is for a tropical country. (Singapore) We would go to the shop and provide the room area, and the dealer would recommend a 1 hp unit right away without any calculation.
The cooling power needed would be less, when the walls and windows are well insulated, and the sun is not shining into the room. This is whwere you need EPlus simulation to confirm.
300 watt cooling and 800 watt heating are reasonable numbers for a 20 m2 room. These may the sizing numbers, which are the maximum values for the TMY, using the DesignDay data.
Did you multiply the power by the room area to get the 8 and 15 kW values?
Dr. Li
To: EnergyPlus_Support@xxxxxxxxxxxxxxx
From: amyquartette@xxxxxxxxxxx
Date: Wed, 26 Oct 2011 20:36:32 +0000
Subject: [EnergyPlus_Support] Re: Heating/Cooling load
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Heating panel of 25w/m2 means that the total power has to be multiplied by the area of the panel used. With stating the area of the panel or area of the zone, how do you make the comparison?
There is no tatal cooling rate per area for a year.
What is the heat and cold dissipation of a zone? The power required to heat or cool the zone to the thermostat set point temperature are Zone/Sys Sensible Heating Rate and Zone/Sys Sensible Cooling Rate. The unit is in watts. (In Boby's mail below.) Note that the value is hourly averaged power. If you turn on and off some equipment, the timestep values will follow the additiona load.
You need to state the outdoor temperature and zone mean temperature for comparison.
With 33°C ODT and 22°C zone mean temperature, a 20 m2 room would need about 500 watt to cool, (1 hp window unit, 746 watts) asuming that the building insulation is for a tropical country. (Singapore) We would go to the shop and provide the room area, and the dealer would recommend a 1 hp unit right away without any calculation.
The cooling power needed would be less, when the walls and windows are well insulated, and the sun is not shining into the room. This is whwere you need EPlus simulation to confirm.
300 watt cooling and 800 watt heating are reasonable numbers for a 20 m2 room. These may the sizing numbers, which are the maximum values for the TMY, using the DesignDay data.
Did you multiply the power by the room area to get the 8 and 15 kW values?
Dr. Li
To: EnergyPlus_Support@xxxxxxxxxxxxxxx
From: amyquartette@xxxxxxxxxxx
Date: Wed, 26 Oct 2011 20:36:32 +0000
Subject: [EnergyPlus_Support] Re: Heating/Cooling load
Hi, thanks for your remind.
With the method of OtherEquipment, a heating Panel of 25 W/m² and a cooling Panel of 30 W/m² are already enough for my model. But with the HVACTemplate:Zone:IdealLoadsAirSystem the higheste ideal Loads air Heating/total Cooling rate of the year reach 300 W/m² and 800 W/m². Is this possible?
When I am interserted in the heat and cold dissipation, are Zone/Sys Sensible Heating Rate and Zone/Sys Sensible Cooling Rate the right outputs for me?
Thanks in advance!
--- In EnergyPlus_Support@xxxxxxxxxxxxxxx, "Jean marais" <jeannieboef@...> wrote:
>
> Simulate the building without heating and cooling and see if it behaves as expected.
>
> How, if at all, do you model infiltration? What kind of U-Values do you have for your constructions? Are they realistic? Are you outputting an AllSummary report to check things?
>
> Check that your outdoor environment temperatures are what you expect.
>
> --- In EnergyPlus_Support@xxxxxxxxxxxxxxx, "amyquartette" <amyquartette@> wrote:
> >
> > I just got the result of the ideal Loads air Heating rate and Ideal Loads air total cooling rate.
> >
> > The result seems to be abnormal high. For a 20 m² Living Room, the higheste ideal Loads air Heating rate of the year reaches 8 kW, and the Loads air total cooling rate 15 kW! What could be the Problem?
> >
> >
> > --- In EnergyPlus_Support@xxxxxxxxxxxxxxx, Slobodan Krsmanovic <loconinja@> wrote:
> > >
> > > >
> > > > I'm confused with the following 2 groups of outputs.
> > > >
> > > > 1)Output:Variable,*,Zone/Sys Sensible Heating Rate,hourly; !- HVAC Average
> > > > [W]
> > > > Output:Variable,*,Zone/Sys Sensible Cooling Rate,hourly; !- HVAC Average
> > > > [W]
> > > >
> > > > 2) Output:Variable,*,Ideal Loads Air Heating Rate,hourly; !- HVAC Average
> > > > [W]
> > > >
> > > > Output:Variable,*,Ideal Loads Air Sensible Cooling Rate,hourly; !- HVAC
> > > > Average [W]
> > > > Output:Variable,*,Ideal Loads Air Total Cooling Rate,hourly; !- HVAC
> > > > Average [W]
> > > >
> > > > Could anyone tell the difference? Thanks!
> > > >
> > >
> > > Well, for summer time conditioning you "need" to know both sensible and
> > > latent part of cooling rate/load! Latent part comes from
> > > elements like people, outdoor air infiltration to zone, equipment, etc. So,
> > > if you add up Sensible and Latent, you'll get Total Cooling Rate!
> > > Or, in this case if you subtract them, you'll get only the Latent part of
> > > total load. If I'm not mistaken, this latent part is sometimes called
> > > Dehumdification Load! Hope this helps..
> > >
> > > Cheers
> > > Boby
> > >
> >
>
With the method of OtherEquipment, a heating Panel of 25 W/m² and a cooling Panel of 30 W/m² are already enough for my model. But with the HVACTemplate:Zone:IdealLoadsAirSystem the higheste ideal Loads air Heating/total Cooling rate of the year reach 300 W/m² and 800 W/m². Is this possible?
When I am interserted in the heat and cold dissipation, are Zone/Sys Sensible Heating Rate and Zone/Sys Sensible Cooling Rate the right outputs for me?
Thanks in advance!
--- In EnergyPlus_Support@xxxxxxxxxxxxxxx, "Jean marais" <jeannieboef@...> wrote:
>
> Simulate the building without heating and cooling and see if it behaves as expected.
>
> How, if at all, do you model infiltration? What kind of U-Values do you have for your constructions? Are they realistic? Are you outputting an AllSummary report to check things?
>
> Check that your outdoor environment temperatures are what you expect.
>
> --- In EnergyPlus_Support@xxxxxxxxxxxxxxx, "amyquartette" <amyquartette@> wrote:
> >
> > I just got the result of the ideal Loads air Heating rate and Ideal Loads air total cooling rate.
> >
> > The result seems to be abnormal high. For a 20 m² Living Room, the higheste ideal Loads air Heating rate of the year reaches 8 kW, and the Loads air total cooling rate 15 kW! What could be the Problem?
> >
> >
> > --- In EnergyPlus_Support@xxxxxxxxxxxxxxx, Slobodan Krsmanovic <loconinja@> wrote:
> > >
> > > >
> > > > I'm confused with the following 2 groups of outputs.
> > > >
> > > > 1)Output:Variable,*,Zone/Sys Sensible Heating Rate,hourly; !- HVAC Average
> > > > [W]
> > > > Output:Variable,*,Zone/Sys Sensible Cooling Rate,hourly; !- HVAC Average
> > > > [W]
> > > >
> > > > 2) Output:Variable,*,Ideal Loads Air Heating Rate,hourly; !- HVAC Average
> > > > [W]
> > > >
> > > > Output:Variable,*,Ideal Loads Air Sensible Cooling Rate,hourly; !- HVAC
> > > > Average [W]
> > > > Output:Variable,*,Ideal Loads Air Total Cooling Rate,hourly; !- HVAC
> > > > Average [W]
> > > >
> > > > Could anyone tell the difference? Thanks!
> > > >
> > >
> > > Well, for summer time conditioning you "need" to know both sensible and
> > > latent part of cooling rate/load! Latent part comes from
> > > elements like people, outdoor air infiltration to zone, equipment, etc. So,
> > > if you add up Sensible and Latent, you'll get Total Cooling Rate!
> > > Or, in this case if you subtract them, you'll get only the Latent part of
> > > total load. If I'm not mistaken, this latent part is sometimes called
> > > Dehumdification Load! Hope this helps..
> > >
> > > Cheers
> > > Boby
> > >
> >
>
__._,_.___
Primary EnergyPlus support is found at:
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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.
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