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William Penn Apts: Case Study Text:
In this case study, Enovative Kontrol Systems set out to address a new set of challenges: providing safe, reliable, hot water to a large, 5-story building, with 189 apartments, on a single D’MAND CIRC pump without compromising the quality of service to any of the tenants.
The site for this study was conducted at the William Penn Apartments in Los Angeles, CA over an 8 week period. The property’s hot water was heated by a Raypack boiler and distributed from two storage tanks at a target temperature of 140 ° F. The existing continuous pump that was replaced by D’MAND CIRC was a 12 HP Armstrong S-25.
Over the course of the study, data loggers captured the amount of gas consumed during weeks of continuous pump run-time and weeks of on demand pump run-time. The comparison in savings is portrayed in the bar graph below.
The average weekly savings in gas consumption by the boiler was 12%. Converted into dollars, given an average rate of $1 per therm, the annual savings on the building’s gas bill is over $2,321. In addition, the electricity to run the pump was reduced by D’MAND CIRC an average of 1554 kWh or $233 per year. Energy savings on this scale not only contribute to preserving our natural resources, but they secure the building owner a quick, cost payback period of 8 months.