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UrbanOpt_Hydronic balance of variable primary pumping system #2276

Closed Helarga closed 2 years ago

Helarga commented 3 years ago

The 1st : the 4th UO district cooling/heating systems shall connect the central plant with building_ETS via the distribution network component model. Currently no dedicated hydronic balancing approaches are considered i.e balance valve. Hence the first building connected to the distribution network "the closest to the central plant" receives the highest flow rate, descends to the second till the farthest building.

To solve this issue, NREL team set/tune the parameter value of yMax of the ETS PI con "i.e. a controller which modulates the two way valve val opening to supply the required chilled/heating water flow for each building "to satisfy TSetBuiSup" so that the first building has the smallest yMax value and the farthest one has the largest yMax "ascending from first building closest to the central plant ". image

N.B the variable primary pumps flow is modulated to satisfy a differential pressure sensor located at farthest building.

NREL & LBL teams agreed to investigate/compare with another solution of; assigning different nominal PD value for each valve "descending from the first building" and further check the numerical stability of the above two solutions. @AntoineGautier

Helarga commented 3 years ago

@AntoineGautier @JayHuLBL kindly add the UrbanOpt label and assign me and someone from LBL team, thanks.

AntoineGautier commented 3 years ago

@Helarga Do you have in mind a collaborative action between LBL and NREL to benchmark the two modeling approaches or do rather think of someone at LBL for the review part? In the former case, could you clarify LBL's contribution?

Helarga commented 3 years ago

@AntoineGautier Thanks, Let's bring this up on the next technical meeting and decide how we want to proceed in fixing this issue.

AntoineGautier commented 2 years ago

Closing this issue as it is stalled and will be addressed through #1884.