Question

An office building is space heated between October and April (inclusive). The degree days and the corresponding fuel consumptions in units of 1000 litres for two consecutive years are shown in the following Table. In between the two seasons the heating plant was modernized and insulation work was carried out which cost $30,000. The cost of fuel was 25 c/litre when the costing was done. Plot the fuel consumption/ degree-day characteristics for the two seasons and calculate: (i) the average fuel consumptions for the two seasons in litres per degree day; the saving to be expected per annum based on the average degree- day figures for the district tabulated, for the same months, over a 20- year period the period of repayment for the cost of the modifications. Nov Dec Jan Feb Mar Apr Total 301 26.5 329 27.6 286 24 290 25 310 26 210 17.5 1901 162.1 Oct First Year Degree Days 175 Fuel/(103 litre) 15.5 Second Year Degree Days 245 Fuel/(103 litre) 13 20 years average degree days 140 247 14 220 11 255 12.8 300 16 315 15.8 215 10.8 1797 93.4 243 308 338 310 273 205 1817

Answer 1

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