Medium Sized Home
Figure 1 –Seasonal electricity demand for the existing house, with suggested improvements and compare to a newly built, energy efficient home.
Figure 2 – Break-down of electrical energy including standby energy.
Figure 3 – Potential improvement by replacing major appliances and reducing standby power.
| Your Appliance | Energy Use | Better Appliance Energy Use | Reduction in Daily Demand |
|---|---|---|---|
| Fridge/Freezer 450L | 2.67 kW h/d | 1.3 kW h/d | 1.37 kW h/d |
| Dishwasher | 2.224 kW/use | 0.62 kW/use | 0.69 kW/use |
| Clothes Dryer | 0.985 kW/use | 0.56 kW/use | 0.18 kW/use |
| Standby | 0.64 kW h/d | Use of power boards or replacement with less than 1W standby power appliances |
0.4 kW h/d |
Figure 4 – Comparison of Electricity Use before and after energy efficient target changes
| End Use Breakdown | Previoius Energy Use (kW h/d) | Percent (%) | Energy Effecient Target (kW h/d) |
|---|---|---|---|
| Lighting | 0.71 | 2.5 | 0.71 |
| Refigeration | 4.72 | 16.6 | 1.30 |
| Water Heating | 6.56 | 23.0 | 1.30 |
| Space Heating | 0.03 | 0.1 | 0.03 |
| Space Cooling | 0.31 | 1.1 | 0.31 |
| Water Pumping | 11.07 | 38.9 | 5.54 |
| Kitechen | 2.35 | 8.3 | 2.08 |
| Entertainment / Communication |
1.38 | 4.9 | 0.98 |
| Cleaning | 1.06 | 3.7 | 0.82 |
| Tools | 0.00 | 0.0 | 0.00 |
| Other | 0.26 | 0.9 | 0.26 |
| TOTAL | 28.47 | 100.0 | 13.34 |
List of changes and suggested priority order
- Investigate more efficient water pumping technology and management strategies – expensive but worthwile.
- Install Solar Water Heater
- Buy and install power boards to reduce standby – easy and cheap to do.
- Insulate the roof – realtively expensive – improved comfort year round, particularly during extreme weather events.
- Replace fridge/freezers – reduce to one fridge/freezer and upgrade to a more efficient model when replacement is due.
- Replace dishwasher and clothes dryer when required.