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Can I model a tank which has three different inputs and outputs?

asked 2020-02-19 05:59:59 -0600

mayks's avatar

updated 2020-03-08 11:41:42 -0600

Hello, I´m modelling a system in energyplus that has three cooling towers and three chillers and all of them are coupled to one accummulation tank. What object can I use? (I tried to use ThermalStorage:ChilledWater: Mixed but I just can put one inlet and one outlet node). The inlets of the accumulation tank comes from the cooling towers and then goes to the chiller.

I also want to know which object can I use for a stratified tank that can have also three inlets. Thank you

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answered 2020-02-20 04:09:47 -0600

mayks's avatar

I see what you have done, but my system is composed by two differnt loops each one with a different coolingTower and chiller but ther are connected through the tank. Can I still do it as you? My system is in the link below

link text

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This should have been a comment and not an answer. I'm getting a 403 (forbidden access) at the link you gave.

Julien Marrec's avatar Julien Marrec  ( 2020-02-20 05:15:28 -0600 )edit
mayks's avatar mayks  ( 2020-02-20 05:35:44 -0600 )edit

answered 2020-02-20 03:59:35 -0600

I can suggest an idea...

Your Cooling Towers would be on the supply side of a plant loop, on parallel branches. Then it mixes via the PlantLoop Mixer, goes to the demand side, at which point you just place a WaterHeater:Mixed (or WaterHeater:Stratified).

That WaterHeater:Mixed is then on the supply side of another plant loop, and on the demand side you place all three chillers in parallel (their condenser nodes). The Pump for that loop can be "virtual" with a very low pressure rise and almost 0 power used.

The three chillers are then on the supply side of the Chilled water loop (evaporator side), serving the building load.

Here's a showcase of my Pinta (Paint) skills:

image description

An alternative may be to use just two loops and to manually set a large Plant Loop Volume for the PlantLoop "condenser water loop".

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Is the Cooling Tower operation controlled by the temperature of the tank? (with a bypass not shown?)

Julien Marrec's avatar Julien Marrec  ( 2020-02-20 07:38:46 -0600 )edit

yes the cooling tower is controlled by the tank I didn´t draw the bypass pipes, but they all have

mayks's avatar mayks  ( 2020-02-20 07:47:55 -0600 )edit

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Asked: 2020-02-19 05:59:59 -0600

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Last updated: Feb 20 '20