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underfloor heating undertile haeting
Please read carefully - important for understanding under floor
heating: If 160 Watt/m² floor heating is fitted in a room with floor tiles, the heating only consumes 160 Watt/m² during the warm-up period, e.g. from 18°C to the target floor temperature of 24°C. At 160 Watt/m² rating this is of course correspondingly faster than 120 Watt/m² - and you save time in the warm-up phase. Subsequently the floor heating, i.e. from the surface of the floor tiles, only releases approx. 10 Watt/m² heating power into the room for each degree Celsius warmer than the room itself. Roughly half of the heat is released into the room in the form of infrared heat, i.e. radiant heat. If the temperature in the room is 22°C and the floor is 24°C, the floor heating would then only release 20 Watt/m² into the room. If the room is warmed e.g. by the sun to 24°C, the floor heating will release no more heat at all into the room and therefore not consume any more electricity. This is the self-regulation effect of floor heating." The high percentage of radiant heat in underfloor heating means that the room temperature can easily be turned down by several degrees to e.g. 20°C, and it will still be perceived as pleasantly warm. A floor temperature of 21°C is felt as warm (the emphasis here is on the feeling of comfort created by under floor heating - the prime source of heating is e.g. radiators). In this case the floor heating would only release 10 Watt/m² into the room. With a heating area of e.g. 10 m² and a rating of 10 Watt/m² this would result in electricity costs of 15 cents for 10 hours at a price of 15 cents/kHz. This assumes adequate thermal insulation beneath the floor base. In an extreme case, a 160 Watt/m² floor heating system would heat a room from 20°C to 36°C (i.e. one degree per 10 Watts) if it were not limited by the thermostat to approx. 28-29°C. If the floor plate is thick enough, e.g. 8cm (e.g. heating base from Knauf) and if the customer has access to suitably low-cost storage heating electricity, it is also possible to heat an entire apartment or individual rooms with night storage underfloor heating. The investment costs are relatively low. If the intention is to use the underfloor system as the main source of heating, it is important to use low-cost night storage current. The consumption costs: i.e. one litre of heating oil provides 10kW/h of chemical energy although only 80-90% is actually used as heat in the flat (boiler, radiation and chimney losses). In the case of electricity, however, 100% is given up to the floor surface. And there are no costs for chimney sweeps, boiler maintenance or fume emission measurement. http://www.soldron.de/titeleng.htm |
#2
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underfloor heating undertile haeting
Nordmi wrote
... electricity costs of 15 cents for 10 hours at a price of 15 cents/kHz. Very cheap at 50 Hz :-) ... one litre of heating oil provides 10kW/h of chemical energy... What's a kW/h? :-) Nick |
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