MULTI-VENDOR RTU RETROFIT CONTROLLER FIELD STUDY

Category: 
Commercial
Project Number: 
ET12SDGE0003
Start Year: 
2012
End Year: 
2013
Markets Segments: 
Commercial
Commercial Office
Commercial, Small
Educational Facilities
Food Service Industry
Government - Institutional Facilities
Hospitality
Retail
Supermarket
Project Type: 
Demand Savings
Demonstration
Electric Energy Savings
Product Evaluation
Type of Technology: 
HVAC, Commercial
Organization: 
San Diego Gas and Electric (SDG&E - a Sempra utility)
Project Status: 
Completed
Savings Type: 
Work
Industry

Four different retrofit RTU controllers were tested on four 7.5 ton heat pumps serving office space at one building in San Diego. The operation of those units was alternated on a weekly basis from baseline to retrofit mode. Proper operation of the each controller was verified and the features of the controllers were compared to each other. Total heat pump electric power was measured at 1 minute intervals. The data was then re-sampled at hourly and daily intervals and was compared to various independent variables. Linear regression models were created to normalize for those independent variables and energy savings was calculated.

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