products > Radiel
Comparison between a traditional heating system and RADIEL |
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Single detached house with an area of 120 square metres on an only floor with a good thermal coefficient |
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Classical system boiler/radiators |
RADIEL radiating system |
Power referred to thermal k: 100 w/sq.m. convective heating |
Power referred to thermal k: 44 w/sq.m. radiating heating |
NB: the difference between the two powers depends on the heating convection system and on the convective losses of the system, compared to the electric radiating heating system RADIEL. |
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Power needed: 100 x 120 = 1.2000 w to keep a room at 20°C |
Power needed: 44 x 120 = 5.280 w to keep a room at 20°C |
12 kw x 14 (hours a day) = 168 kw/h theoretical daily consumption |
5,28 kw x 14 (hours a day) = 73,92 kw/h theoretical daily consumption |
168 x 180 (Oct 15/Apr 15) = 30.240 kw/h theoretical yearly consumption |
73,92 x 180 (Oct 15/Apr 15)= 13305.6 theoretical yearly consumption |
30.240 x 2/3 (fast procedure referring to degrees a day) = 20.160 kw/h expected yearly consumption |
13.305.6 x 2/3 (fast procedure referring to degrees a day) = 8.870 kw/h expected yearly consumption |
NB: it's almost impossible to estimate the consumption of a thermal system, as there are too many variable parameters making it up, first of all the climatic trend, which can never be foreseen. |
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Plant cost |
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€ 9.000 (boiler, radiators, plant) |
Installed power: 5 kw (10 Radiel) € 6.380 |
Yearly routine and extra maintenance cost |
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€ 280 (including check-ups and cleaning) |
€ 0 (no maintenance at all) |
Running costs for the whole season (Cuneo area, -10°C) |
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20.160 kw/h |
8.870 kw/h |
20.160 + 30% = 26.208 kw/h plant yield |
8.870 kw/h 100% yield |
26.208 x 860 = 22.538.880 from kw/h to kcal/h |
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22.538.880 : 8250 (natural gas lower calorific power) = 2.732 cubic metres natural gas |
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2.732 x 0.85 (natural gas cost per cubic metre, taxes included) kw/h taxes = € 2.322 yearly charges |
8.870 x 0.2 (electricity cost per kw/h taxes included)= € 1.774 yearly charges |
Comparison on a 20-year time, at unchanged prices: hypothesis |
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Plant 9.000 |
6.380 |
Maintenance 5.600 |
0 |
Consumption 46.440 |
35.480 |
Boiler (to be substituted after 10 years) 2.000 |
= |
Total amount 63.040 (3.152 per year) |
Total amount 41.860 (2.093 per year) |
63.040 - 41.860 = € 21.180 saved in 20 years |
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3.152 - 2.093 = € 1.059 saved per year |
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Energy bill: photovoltaic 3kwp cost € 10.500 3 kwp x 1.150 (kw/h produced in 1 year in Northern Italy) = 3.450 kw/h a year |
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3.450 kw/h produced by the plant, yielded to the electricity supplier and adjusted at the end of the year |
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8.870 - 3.450 = 5.420kw/h paid per year (on the spot exchange) |
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5.420 x 0.2 = € 1.084 yearly charges |
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Running costs per season with photovoltaic 3 kwp |
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3.152 (yearly charges) - 1.131 (earning from energy sale) |
1.131 (yearly earnings) - 1.084 (yearly charges) |
Comparison over a 20-year time |
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2.021 x 20 = € 40.420 |
47 x 20 = € 940 earnings |
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