Question 10.5: Estimate the annual phantom load for a TV with a set-top box......
Estimate the annual phantom load for a TV with a set-top box if the TV is operated 2 \ h/day. Determine the annual cost of the phantom load energy if the electricity cost is 0.10/kWh.
Based on Table 10.6, the standby power for a TV is 3 \ W, while of the set-top box is 17.8 \ W;
thus, W_{stby}=20.8 \ W. Since the TV and its set-top box are operated 2 \ h/day, it is turned off 22 \ h/day. Therefore, N_{h,off}=22 \ h/day*365 \ days/year=8030 \ h/year. Using Equation 10.5, the annual energy used by the phantom load associated with the TV and the set-top box is
kWh_{stby}=W_{stby,j}\cdot N_{h,off} (10.5)
kWh_{stby}=(20.8 \ W)(8,030 \ h/year)=167,024 \ W/year=167 \ kWh/yearThus, the annual cost of the phantom load is $16.7/year, based on $0.10/kWh electricity cost. The use of power strip would save this annual cost.
TABLE 10.6
Status of International Residential Appliance Energy Efficiency Standards
| Compliance Status | Compliance Status | Country/Region |
| R, FR, WH | Mandatory | Australia |
| R, FR | Voluntary | Brazil |
| All | Mandatory | Canada |
| R, CW, RAC | Mandatory | China |
| R, FR | Mandatory | European Union |
| R, RAC, A/C | Voluntary | India |
| A/C | Voluntary | Japan |
| R, A/C | Mandatory | Korea |
| R, FR, RAC | Mandatory | Mexico |
| A/C | Mandatory | Philippines |
| All | Mandatory | United States |
| Notes: Products are: Refrigerators (R), Freezers (FR), Clothes Washers (CW), Cooking, Water Heaters (WH), Room Air Conditioners (RAC), and Central Air Conditioning (A/C). All include all the previously appliances including Dishwashers and Clothes Dryers. |
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TABLE 10.9
Measured Average Standby Power and Energy Standard Requirements for Selected Electrical Devices
| Energy Star Standby Power (W) | Average Standby Power (W) | Electrical Device |
| 1 | 3 | TV (CRT) |
| 1 | 17.8 | Set-top box, digital cable |
| 1 | 8.3 | Audio mini-system |
| 1 | 4.7 | VCR |
| 1 | 1.6 | DVD player |
| 2 | 2.8 | Desktop computer |
| 1 | 8.9 | Laptop computer |
| 1 | 1.4 | Printer |
| 2 | 5.3 | Fax machine |
| 1 | 1.5 | Copier |
| 2 | 2.9 | Microwave oven |