Data from Sustainability Base Characterizing Hot Water Pump Differential Pressure Spikes for ACCEPT

Metadata Updated: February 28, 2019

During the heating season in Sustainability Base, a critical alarm associated with a hot water pump circulating heating water for the radiative system which exchanges heat via a geothermal heat pump was found. After further investigation it was ascertained that many such alarms were experienced throughout the entire heating season. These alarms are triggered as a result of the excursion of the hot water differential pressure outside of a nominal operating envelope for a fixed duration. There is a control system associated with regulating the hot water pump differential pressure to a fixed operating setpoint, and there are natural variations in the system that allow the pressure to be regulated and maintained within these nominal operating bounds. However, when system changes occur such as valves opening or closing to support the distribution of hot water through PVC piping to areas of the building where heating demand is called for in response to zone temperature requirements, the pump's operating speed must change accordingly to maintain this setpoint. If the pump speed does not change quickly enough to accommodate heating demand, these alarms can result and consequentially water hammer can occur, which may lead to accelerated aging of the PVC piping infrastructure as well as fittings, elbows, etc. In the worst case scenario it could cause leaking or bursting pipes.

The zip file linked contains three subdirectories and a parameter list to be used for processing using ACCEPT. Datafiles are partitioned into training, validation, and testing sub-directory structures. A text file contains all parameter identifiers associated with the cold complaint prediction scenario. Please note that the parameter list is a text file containing the following lines:

DCHWSSF - South Wing water flow rate DCHWSNF - North Wing water flow rate DCHWDP - Hot Water Pump Differential Pressure DCHWP1SP - Hot Water Pump Differential Speed DCHWP1S - Hot Water Pump Status Indicator

The last parameter in this list is intended only to provide indication of ground truth (pump exceedances), and is not meant to construct models in ACCEPT. Data was collected from November 03, 2014 to February 03, 2015, and the alarm threshold limits of operation are flagged above 6.0 psid and below 4.5 psid. It should be noted the normal operation for the pump includes periods when it is off, when it retains a residual static pressure (~ 1.0 psid). The static binary indicator provides this information.

Access & Use Information

Public: This dataset is intended for public access and use. License: U.S. Government Work

Downloads & Resources

Dates

Metadata Created Date August 1, 2018
Metadata Updated Date February 28, 2019
Data Update Frequency irregular

Metadata Source

Harvested from NASA Data.json

Additional Metadata

Resource Type Dataset
Metadata Created Date August 1, 2018
Metadata Updated Date February 28, 2019
Publisher Dashlink
Unique Identifier DASHLINK_946
Maintainer
RODNEY MARTIN
Maintainer Email
Public Access Level public
Data Update Frequency irregular
Bureau Code 026:00
Metadata Context https://project-open-data.cio.gov/v1.1/schema/catalog.jsonld
Metadata Catalog ID https://data.nasa.gov/data.json
Schema Version https://project-open-data.cio.gov/v1.1/schema
Catalog Describedby https://project-open-data.cio.gov/v1.1/schema/catalog.json
Harvest Object Id 3fdee7b5-aa15-4148-9bf5-48fd6b4490db
Harvest Source Id 39e4ad2a-47ca-4507-8258-852babd0fd99
Harvest Source Title NASA Data.json
Data First Published 2016-01-15
Homepage URL https://c3.nasa.gov/dashlink/resources/946/
License http://www.usa.gov/publicdomain/label/1.0/
Data Last Modified 2018-07-19
Program Code 026:029
Source Datajson Identifier True
Source Hash 8e6fcc4fb4c4fd1c4979c54b2a6b35ab1f1ed9a8
Source Schema Version 1.1

Didn't find what you're looking for? Suggest a dataset here.