[EnergyPlus_Support] Re: Problem with pumps

["Jean marais" <jeannieboef@xxxxxxxxx>]

fundimentals to E+. you can only have one splitter and one mixer, that means the construction of parallel branches on a parallel branch is not permitted. as you have pumps on these branches you have to make a plan to achive equivalence for energy consumption. 

--- In EnergyPlus_Support@xxxxxxxxxxxxxxx, YuanLu Li <yli006@...> wrote:
>
> 
> What you have shown are not complete demand loop, supply loops, etc. as described in the EPlus I/O manual and examples.
>  
> One boiler tank to supply all the demand is one plant loop.  Look up the water heater tank object to see how the branches should be connected.  The tank can be gas or electric heated, or puchased hot water.  This is the supply side of the tank, which may have a pump.
>  
> The domestic main supply is connected to the tank use side loop which may have a pump, which is used as a control valve for domestic water intake.   
>  
> DHW and radiant panels are all demand loop branches one one heater tank loop.
>  
> Bypass branch should be provided so that tank water can be circulated (pump) to maintain the temperature to the tank setpoint value, when there is no demand.
>  
> Draw a complete diagram with splitter and mixer and all the branches, and the domestic main water supply and the DWH water tempering valve, you will then have a better idea of the system.  There is such a diagram in the I/O Ref. Manual.
>  
> Without looking at your IDF, I have no idea how you are simulating your system.
> 
>  Dr. Li   
> 
> 
>  
> 
> 
> 
> To: EnergyPlus_Support@xxxxxxxxxxxxxxx
> From: lbarosow@...
> Date: Mon, 14 Feb 2011 03:32:14 -0800
> Subject: [EnergyPlus_Support] Problem with pumps
> 
> 
>   
> 
> 
> 
> 
> 
> Hello Everyone,
> I am trying to model a Radiator Heating system and I have a problem with the pumps. I've attached a scheme for more clearance. The water from the boiler is transported through a circulation pump (pump 1 on the scheme) and then distributed to four consumers, each on a separate branch. Each of these branches also has a circulation pump (pumps 2, 3, 4 and 5). When I try to model this exact situation in E+, the following error is being generated;
> 
> 
> ** An active component should not be present in the first branch in conjunction with branch pumps
> ** Current version does not support Loop pumps and branch pumps together
> 
> 
> How should I proceed in this case? Should I remove the pumps 2, 3, 4 and 5 which are on the branches, or is it better to remove pump 1 and leave the rest? Or is there some other way to solve this and how would it reflect on the energy consumption?
> 
> 
> Thank you!
> Lyuben
>




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