[Date Prev][Date Next][Thread Prev][Thread Next][Date Index][Thread Index]

Re: [EnergyPlus_Support] Re: open expansion tank





sorry i dont undrestand "Pressure simulation is secondary in E+ and much based in input data for losses in components."
what do you mean? can you explain more. thanks
there is two water heater , the main water heater is heated by natural gas and make water hot for radiator and secodn water heater.
in second water heater there is source flow rate from main water heater and use flow rate for DHW .
there is one thermostat for pump , and one thermostat for main water heater .
and also there is open expansion tank.
the volume of main water heater tank is around 80 liter with capacity heater of 140 w,
and second water heater tank is around 1400 liter ,
and volume of expansion open tank is around 300 liter . this expansion tank  cause loss heat and consume lot heating of heater of main water heater .
but in energyplus when i set autosize , it get main water heater tank volume around 2400 liter , but i think it is wrong.
and when i set volume tank around 0.08 , my result is not correct
 
 
 
in energyplus

From: ecoeficientees <ecoeficiente@xxxxxxxxx>
To: EnergyPlus_Support@xxxxxxxxxxxxxxx
Sent: Friday, May 11, 2012 4:40 PM
Subject: [EnergyPlus_Support] Re: open expansion tank

 
There is not such component in Energyplus. Pressure simulation is secondary in E+ and much based in input data for losses in components.
I also agree in that you should define the objective of including that object (thermal losses, pressure simulation, circuit volume capacitance...) so that you may define a equivalent model. I am not sure what kind of result you are looking for. Those tank are intended to absorb water thermal expansion. In a typical E+ simulation, those effects are not accounted...

Regards,

Germán.

--- In EnergyPlus_Support@xxxxxxxxxxxxxxx, Tooran T <t.t111ir@...> wrote:
>
> sorry what do you mean?
> i modeld two loops that these loop have water heater ,
> one for DHW and another for Ã? hot water for radaitor .
> but i need to simulate open expansion tank.
>
>
> ________________________________
> From: MÃ?Æ?Ã?¡rio <mneves32@...>
> To: EnergyPlus_Support@xxxxxxxxxxxxxxx
> Sent: Friday, May 11, 2012 3:20 PM
> Subject: [EnergyPlus_Support] Re: open expansion tank
>
>
> Ã? 
> what is your objective?
>
> --- In EnergyPlus_Support@xxxxxxxxxxxxxxx, "Tooran" <t.t111ir@> wrote:
> >
> > Dear team
> > I want to model a building that have an "open expansion tank". As you know, an "open expansion tank" is a storage tank at the roof of buildings that is at atmosphere pressure and is used to adjust the pressure of the central heating systems. It means when water became hot its volume increases, and this increased volume go to" the open expansion tank" to prevent from increase of the loop pressure and when water became cold and it's volume decreased, the water leave the "open expansion tank" to ncrease the pressure and prevent from the minus pressure.
> > Could you please help me and say which object is good for simulation of "open expansion tank" as described above?
> > Regards
> >
>





__._,_.___


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.




Your email settings: Individual Email|Traditional
Change settings via the Web (Yahoo! ID required)
Change settings via email: Switch delivery to Daily Digest | Switch to Fully Featured
Visit Your Group | Yahoo! Groups Terms of Use | Unsubscribe

__,_._,___