Date: Tue, 15 Feb 2011 12:33:08 -0800
Subject: Re: [EnergyPlus_Support] Problem with pumps
Dear Dr. Li,
Thank you for the suggested solution. I found the diagram but I think that it is for different system than the one I have and if I use it then the components won't be sized correctly.
I've prepared and attached a new scheme, which I think gives a better illustration of the system that I need to model.
Basically there is a diesel boiler that supplies all the heat for heating and domestic water use for two zones. The I/O temperatures of the heating system will be 80/60 oC.
The tempearture of the DHW will be 65 oC and will be achieved through indirect heating in a water heater (for each zone), using the water from the boiler (80 oC).
(Input 80°C and output 65°C by heating.)
My original idea was to model each branch after the splitter as a separate demand, but the main problem occured that there are pumps after the splitter. And EnergyPlus says they can't be there. (Error messages?)
Moreover, the water heaters also must be on the supply side and probably this would generate another error message. I understand that I have to somehow model all the splitter outlet branches including the pumps and water heaters as supply ones but for now I can't find a way to do that. Any help would be highly appreciated!
Read and run the examples in the Getting Started Document.
The solar collector example is the nearest model.
From: YuanLu Li <yli006@xxxxxxxxxxx>
To: Linda Lawrie <energyplus_support@xxxxxxxxxxxxxxx>
Sent: Mon, February 14, 2011 11:46:18 PM
Subject: RE: [EnergyPlus_Support] Problem with pumps
What you have shown are not complete demand loop, supply loops, etc. as described in the EPlus I/O manual and examples.
Date: Mon, 14 Feb 2011 03:32:14 -0800
Subject: [EnergyPlus_Support] Problem with pumps
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?
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