This case study describes how The Enovative Demand Controller saves building owners thousands of dollars per year with a simple retrofit on their central water heating system.
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Oxford Club Apts: Case Study Text:
The importance of hot water is integral to any building for basic comfort and sanitation. Unfortunately, existing systems for reliable water heating waste money and energy by running 24 hours a day. Enovative’s D’MAND CIRC pump resolves this problem by monitoring the hot water use to only activate on demand, conserving energy and creating significant savings in the building’s annual expenses.
To test the effectiveness of the D’MAND CIRC, a one month case study was conducted in September 2008 on the Oxford Club Apartments, a 5 story building with 50 residential units. A data logger was installed on the pump to take measurements of gas use, water temperature, and pump run time.
To compare the results with traditional recirculation pumps, the D’MAND CIRC was alternated between running continuous and on demand for each week of the study.
The final data revealed that the D’MAND CIRC averaged only 2.9 hours per day by running on demand. This meant a 78% reduction in the pump’s electricity consumption, an annual savings of 631 kWh or $107. The reduced running time also meant 30% less natural gas used in the building, an annual saving of 281,560 cubic feet of gas, 2,892 therms, or $4,048.
The conclusion of these findings is very clear. From the tenant’s perspective, the D’MAND CIRC results in more timely and reliable hot water from the faucet or shower. From the owner’s perspective, there is a huge savings in costs and energy.