Replacing Fridges to Save Energy
How many fridges would need to be replaced with efficient ones to save the electricity generated by the gas plant?
To save the electricity generated by the gas plant, approximately how many fridges would need to be replaced with more efficient ones?
To save the electricity generated by the gas plant, approximately 12,293 fridges would need to be replaced with more efficient ones.
To find the number of fridges that would need to be replaced with efficient ones to save the electricity generated by the gas plant, we need to calculate the annual electricity generation of the gas plant first.
Question 4:
A 700 MW combined-cycle gas power plant is 60% efficient and has a capacity factor of 80%. The capacity factor represents the proportion of the time the plant operates at its full capacity. To calculate the annual electricity generation, we multiply the plant's capacity by the number of hours in a year (8760 hours) and then multiply by the efficiency and capacity factor:
Annual electricity generation = 700 MW * 8760 hours/year * 60% * 80%
= 700 MW * 8760 hours/year * 0.60 * 0.80
= 3,688,320 MWh/year
= 3,688 GWh/year
Now, let's calculate the electricity consumption of the less efficient fridge (current model) and the more efficient fridge:
Question 7:
Less efficient fridge electricity consumption per year = 700 kWh/year
More efficient fridge electricity consumption per year = 400 kWh/year
To find the electricity savings per year by using the more efficient fridge:
Electricity savings per year = Less efficient fridge consumption - More efficient fridge consumption
= 700 kWh/year - 400 kWh/year
= 300 kWh/year
Now, we need to find how many fridges need to be replaced to save the electricity generated by the gas plant:
Number of fridges to be replaced = Annual electricity generation of gas plant / Electricity savings per fridge
= 3,688 GWh/year / 0.3 MWh/year (300 kWh/year converted to MWh)
= 12,293.33 fridges (approx)
Therefore, approximately 12,293 fridges would need to be replaced with efficient ones to save the electricity that would be generated by the gas plant.