- 131 residential lots
- 4 commercial lots
- 10 residential levels
- 5 levels of basement car parking
- roof entertainment area
- outdoor garden
Having implemented sub-metering to get a handle on their buildings energy usage, Bauhous Apartments installed 5 energy controllers. Continued metering proved the reduction in energy usage achieved and the dollars saved.
The first measurements taken in Bauhaus’ sub-metering project assessed the impact of Voltage Optimisers that were installed in February 2007. These were installed on the recommendation of the then building manager and have been in operation to date.
Analysis of the resultant data revealed the Voltage Optimisers reduced energy consumption of fluorescent lighting by an average of 35%, and that Bauhaus was saving $2,400 dollars annually on electricity.
The equipment had cost only $3,900 initially. If installed today the payback period would be 19.2 months at current energy prices.
3 x 16 amp Clipsal energy controllers
Total Cost: $3,900 (in 2007)
Sub-metering Data Analysis
3 circuits were measured for 3 weeks. The measurements taken over the first 3-week cycle included the Voltage Optimisers connected to the garage lighting circuits. For the duration of the second 3-week cycle, the Voltage Optimisers were disconnected.
The measurements commenced at midnight Sunday morning and concluded 3 weeks later at midnight. 1,920 data points were recorded for each circuit.
The Voltage Optimisers were disconnected on September 27 in anticipation of commencing measurements at midnight on September 29. The Voltage Optimsers where reconnected on October 25 in anticipation of commencing the third 3-week cycle. There is an obvious change in the Power Factor during this time.
The following table shows the decrease in consumption for the period measured and further extrapolates it to 12 months.
Total savings over the life of the equipment were then calculated and summarised: