Question

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7. Calculate the annual cost savings if a customer purchases the transformer and switches from a secondary to primary rate if E 500,000 kWh/month, D 1,200 kW. If the transformer could be purchased for $20,000, determine the simple payback. Primary Rate Service: $95/month Demand: $13.80 /kW-month Ded: $14.10/kW-month Energy: $0.021/kWh Secondary Rate Service: $16 /month Energy: $0.030/kWh for first 125,000 kWh 0.025 /kWh for over 125,000 kWh

Answer 1

Given data, E = 500,000 kWh/month D = 1,200 kW. Primary rate Service: $ 95/month demand: $ 13.80/kW middot month Energy: $ 0.021/kWh Secondary rate Service: $ 16/month demand: $ 14-10/kW-month Energy: $ 0-30/kWh for 1st 125,000 kWh $ 0.025/kWh for over 125,000 kWh A Secondary Rate, monthly cost. Secondary rate = Service + demand times demand rate + 125000 (Energy rate) Substitute all secondary rate values in above, = $ 16 + 1200 times $ 14.10 + 125000 times $ 0.030 + (500000 - 125000) times $ 0.025 Secondary rate = $ 30061 A Primary rate, monthly cost. Primary rate = service + demand times demand rate + Total Energy times Energy rate Substitute all primary rates in above, = $ 95 + 1200 times $ 13.80 + 500000 * $ 0.21 Primary rate = $ 2.7155 \r\n monthly saving for switching to primary form. Therefore Secondary rate = Secondary rate

Answer 2

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