Energy efficiency measures - Commercial - Lights - Water heater - Office / South Africa
Case study assignment
A municipal building will undergo retrofitting to reduce energy use, part of which includes reducing energy consumption for lighting and water heating.
Base case
Solution
The worked-out solution is the data file selected from within the RETScreen Project Database. The user automatically downloads the Project Database file while downloading the RETScreen software.
Similar project
In 2005 the Ekurhuleni Metropolitan Municipality in South Africa embarked on a program to become more sustainable in energy use through energy efficiency practices in its municipal buildings. The mechanisms included replacement of conventional incandescent lights with compact fluorescent light bulbs, replacement of cool-beam down lights with light-emitting diodes, replacement of urns and kettles with more efficient hydroboil water heaters, and installation of geyser and lighting timers. These measures were determined to be the most cost effective for implementation within limited timeframes and gave significant energy reductions.
Real project (363 KB)
Case study assignment
A municipal building will undergo retrofitting to reduce energy use, part of which includes reducing energy consumption for lighting and water heating.
Base case
- Office building of 11,700 m² has an attached workspace of 3,200 m²
- Office area has incandescent lighting operating 60 h/w with load of 10 W/m²
- Workspace has 8 foot double fluorescent lighting at 2.05 W/m² operating for 60 h/w
- Building contains 23 water boiling kettles and 15 geyser water heaters at 25% duty cycle operating 24 h/d
- Each kettle has 4.2 kW electricity load
- Geyser water heaters consume 0.65 kW each
- Electricity rate is 0.934 ZAR/kWh
- Reduce lighting load in office space to 2.5 W/m² by installing compact fluorescent lights at a total cost of 30,000 ZAR
- Reduce lighting load in workspace to 1.72 W/m² by installing 5 foot double fluorescent lights with electronic ballast for a total cost of 10,000 ZAR
- Replace each kettle with an instantaneous hydroboil water heater of 4.2 kW electricity load, duty cycle of 20% and cost of 4,800 ZAR each
- Limit operation of geyser water heaters to 8 h/d using timers at a cost of 450 ZAR each
- Increase duty cycle of geysers to 45%
- Installation and replacement costs for all lights and water heater controls is estimated to be 335,000 ZAR
- Incentive for the efficiency measures is 50% of total costs
Solution
The worked-out solution is the data file selected from within the RETScreen Project Database. The user automatically downloads the Project Database file while downloading the RETScreen software.
Similar project
In 2005 the Ekurhuleni Metropolitan Municipality in South Africa embarked on a program to become more sustainable in energy use through energy efficiency practices in its municipal buildings. The mechanisms included replacement of conventional incandescent lights with compact fluorescent light bulbs, replacement of cool-beam down lights with light-emitting diodes, replacement of urns and kettles with more efficient hydroboil water heaters, and installation of geyser and lighting timers. These measures were determined to be the most cost effective for implementation within limited timeframes and gave significant energy reductions.
Real project (363 KB)
