electricity in kilowatt hours (kWh) each salon will save in a year, and then how much will be saved from the electricity bill for the college in a year. HINT: There are 14 stations in each salon and therefore there are 14 hairdryers being replaced in each salon. If on average each hairdryer is used for 2 hours per day, complete the following table to calculate the electricity used by the hairdryers in one salon in a year. REMEMBER: there are 200 college days in a year Hairdryer Wattage Number of Total watts Hours on Hours on Kilowatt hours of 1 hairdryers of all 14 per day per year of energy per hairdryer in a salon hairdryers [hours/day] [hours/year] year [W] [W] [kWh/year] 1500 14 1500 x 14 2 2 21,000 W Turbodryer 2000 = x x 21,000 W 200 days 400 hours = = 400 hours 8,400,000 Wh ÷ 1000 = 8400 kWh / year Babyliss 1000 14 1000 x 14 2 2 hours 14,000 W Eco Dry = x x 14,000 W 200 days 400 = = 400 hours 5,600,000 Wh ÷ 1000 = 5600 kWh / year 21,000 8400 Savings Savings – – 14,000 5600 = = 7,000 W 2800 kWh / yr Now we know how much electricity the hairdryers in one use in a year. We can calculate the amount of electricity used in total by all hairdryers in the college’s hairdressing salons. kWh/year for 1 salon kWh/year for 3 salons Turbodryer 2000 8,400 kWh / yr 25,200 kWh / yr
electricity in kilowatt hours (kWh) each salon will save in a year, and then how much will be saved from the electricity bill for the college in a year. HINT: There are 14 stations in each salon and therefore there are 14 hairdryers being replaced in each salon. If on average each hairdryer is used for 2 hours per day, complete the following table to calculate the electricity used by the hairdryers in one salon in a year. REMEMBER: there are 200 college days in a year Hairdryer Wattage of 1 hairdryer [W] Number of hairdryers in a salon Total watts of all 14 hairdryers [W] Hours on per day [hours/day] Hours on per year [hours/year] Kilowatt hours of energy per year [kWh/year] Turbodryer 2000 1500 14 1500 x 14 = 21,000 W 2 2 x 200 days = 400 hours 21,000 W x 400 hours = 8,400,000 Wh ÷ 1000 = 8400 kWh / year Babyliss Eco Dry 1000 14 1000 x 14 = 14,000 W 2 2 hours x 200 days = 400 hours 14,000 W x 400 = 5,600,000 Wh ÷ 1000 = 5600 kWh / year Savings 21,000 – 14,000 = 7,000 W Savings 8400 – 5600 = 2800 kWh / yr Now we know how much electricity the hairdryers in one use in a year. We can calculate the amount of electricity used in total by all hairdryers in the college’s hairdressing salons. kWh/year for 1 salon kWh/year for 3 salons Turbodryer 2000 8,400 kWh / yr 25,200 kWh / yr
college_education_for_sustainable_development_hairdressing_workbook_-_staff.docx