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[EnergyPlus_Support] Re: Solar Domestic Hot Water Problem








Have you posted your IDF to the group?

In the original example, the collector has a low temperature turn off.  When there is ni sun, the temperature is low, and the system shut off by turning off the pump.

There are two tanks connected in series.  The water is provided by the domestic main.  The water does not flow when there is no demand.

The second tank is heated by electricity, in the example.  This heater is the one you wanted to change.  This heater is controlled by monitoring the outlet temperature of the second tank.  The same temperature would also turns off the solar system.

In practice, the DHW supply temperature is always higher than the user set temperature, and lower than the building heating temperature.  The example also you how to mix the tank water and the main water to get a lower temperature.

Try not to change the setpoint manager types, and change the temperature values to what you want.  Then change the plant heater equipment from electricity to gas.  This may not be simple if you do not work with EPlus IDF directly.  This is why I wanted to see how you change the IDF.

Please CC a copy of your reply to my Hotmail ID, as I am not on the group mail forwarding list any more. 

Dr. Li   

--- In EnergyPlus_Support@xxxxxxxxxxxxxxx, Ivan Mezzacapa <ivan_slip@...> wrote:
>
> Thanks!
> could not solve the problem. I do not understand how I schedule it.
> In the case of my project, I need to store the water in the tank with 49°. If this starts to cool too much, the gas heating is triggered.
> That I am not able to do. 
>  Have some data in this example file that could be changed to do this?
> 
> Técg. Ivan Mezzacapa
> Projetista  de Ar Condicionado / Consultor de Eficiência Energética em Ar Condicionado
> LinkedIN: http://www.linkedin.com/in/ivanmezzacapaFacebook: http://www.facebook.com/ivan.mezzacapaCelular: (11)9963-9326
> 
> 
> 
> To: EnergyPlus_Support@xxxxxxxxxxxxxxx
> From: jason.alan.kirkpatrick@...
> Date: Wed, 22 May 2013 19:56:51 -0700
> Subject: Re: [EnergyPlus_Support] Solar Domestic Hot Water Problem
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> I was able to get them to operate independently in the example file
> Relevant fields to look into:
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> in the waterheater:Mixed object,    Deadband Temperature Difference {deltaC}
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> AvailabilityManager:DifferentialThermostat
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> but the one that seemed to make the difference was using a 
> PlantEquipmentOperation:ComponentSetpoint
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> On Wed, May 22, 2013 at 4:18 PM, George Georgiou <georgiou.geo13@...> wrote:
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> I have the same issue as Ivan and it is not clear what I really must do the run a solar collector circuit.
> At the WaterHeater:Mixed object, two objects are used in the particular E+ example. The first is the Instantaneous water (which is the electrical or gas heater) and the other is the storage tank connected to the solar collector. What are the exact parameters that must change so the water heater will work only when the water provided by the solar collector does not meet the water set point.
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> Thank you in advance George
>




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