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[EnergyPlus_Support] Re: open expansion tank



"Building modeling should be representions, of the main feteures of your building in the context of your objectivs" 

So what is your objective in simulating the expansion tank, is i relavant to the study you are doing?



--- In EnergyPlus_Support@xxxxxxxxxxxxxxx, Tooran T <t.t111ir@...> wrote:
>
> 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@...>
> 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 � 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
> > 
> > 
> > �  
> > 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
> > >
> >
>




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