Impact of Green Standards Note Return on Investment(ROI) = Cost Increase/savings

Question

Impact of Green Standards Note Return on Investment(ROI) = Cost Increase/savings year

A 172 sq meter home (1850 sq ft) is being designed with a budget of $580,000. The architect estimates the 172 sq m passive house would cost $720,000. Req. Based on the residential $0.085 kwh estimate for a 172 sq m for June(30days24hr) calculate

300 O Household Electricity D Ventilation Electricity 250 Hot Water Heating E 200 150 a 100 50 0 Current WSchVO SBN 1980 WSchV0 Low Energy Passive Average 1994 1995 usHuse

Explanation / Answer

Solution:

Area , A = 172 m2

For the Passive House:

Energy rating, r = 30 kWh/ m2

? energy consumed in June = r*A = 30 x 172 = 5160 kWh

? the total energy consumption for the whole year will be, E = 5160 x 12 = 61920 kWh

? the total energy expense for the year is , Cp = 61920 * 0.085 = $5263.20

For the Current Average:

Energy rating, r = 280 kWh/ m2

? energy consumed in June = r*A = 280 x 172 = 48160 kWh

? the total energy consumption for the whole year will be, E = 48160 x 12 = 577920 kWh

? the total energy expense for the year is , Cp = 577920 * 0.085 = $49123.20

Thus , the yearly savings wth the passive house will be,

S = 49123.20 – 5263.20 = $ 43860 per year

Return on Investment(ROI) = Cost Increase/savings year

                                            = (720,000 – 580,000) / 43860

ROI = 3.192

Or R = 3.2 years

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