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Re: [EnergyPlus_Support] Water heater - solar collector and instantaneous water heater



Hi Griffith,
 
Do you have more information about using the heater inside the storage tank? How can I model this? Do I have to use only one object: 'water heater:mixed'?
 
Thanks,
Leticia

From: "Griffith, Brent" <brent.griffith@xxxxxxxx>
To: "EnergyPlus_Support@xxxxxxxxxxxxxxx" <EnergyPlus_Support@xxxxxxxxxxxxxxx>
Sent: Fri, October 16, 2009 5:22:55 PM
Subject: RE: [EnergyPlus_Support] Water heater - solar collector and instantaneous water heater

 

In plant loops, temperature- based controls can be modeled using ComponentSetpoint plant equipment operation.  With this you could model as a boiler in series with a temperature setpoint on its outlet.  

 

You also might be able to simplify the problem by using the heater inside the storage tank as a way to model the separate back up heater.

 

 

 

From: EnergyPlus_Support@ yahoogroups. com [mailto: EnergyPlus_Support@ yahoogroups. com ] On Behalf Of Leticia Neves
Sent: Thursday, October 15, 2009 11:33 AM
To: EnergyPlus_Support@ yahoogroups. com
Subject: [EnergyPlus_ Support] Water heater - solar collector and instantaneous water heater

 

 

Hi,

 

I have some issues in a water heater model.

My project consists in a storage tank that is heated both by a solar collector and a instantaneous water heater (that complements the solar collector when it is necessary).

I have two sources to heat the storage tank, but the object 'Water heater: mixed' only allows one inlet and outlet source side.

I can try to create one loop that contains: the solar collector, the pump, the instantaneous water heater and then the storage tank, so I have just one source in the storage tank. The problem is that I have to have the possibility to bypass the instantaneous water heater when it is not necessary. In the 'branch' object I have the option to bypass, but it is controlled only by flow rate, and not by temperature.

How can I do that?

 

Thanks,

Leticia Neves

 




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