Providence Medical Center Chiller Technical Analysis Study

Analysis: Energy model and Energy Trust of Oregon (ETO) Technical Analysis Report. Analysis for DDC controls re-programming, mechanical work for system optimization, variable speed condenser water, addition of fourth chiller and tower.

• Aggregation of trend database files using Microsoft PowerQuery and conformance to a uniform timestep

• Consolidate trends for the performance of the condenser water system, chilled water system, and overall plant performance using Excel

• Regression analysis of the trend data was used to characterize performance of the chilled water flow, chilled water load below the change point, chilled water load above the change point, and overall plant input to output performance

• Generate 8760 model of chilled water load and flow using regression model and TMY3 data

• Generate baseline 8760 model of plant using plant regression model and TMY3 data

• OpenStudio / EnergyPlus model of chilled water plant using the above 8760 chilled water load and flow profile

• Evaluation of first cost and simple payback for:

• New sequence of operations, programming, and retro-commissioning of existing chilled water plant

• Install variable frequency drives on all condenser water pumps

• Install a new, fourth water cooled chiller with cooling tower