Having assessed the actual environmental impact (it can not contaminate not only the door of your house), I now promised, the economic analysis of each major type of heating. Yes, obviaré installation costs in the analysis, and talk only of consumer spending.
googleáis If looking for "comparative heating, probably even bear to a page that holds an old consumption analysis of Union Fenosa in 2003. Although outdated, it is a first reference to see where the shots go, but obviously it was before the night rate to what is now Time Discrimination Rate (Residential) is an odd distance, and fuel costs are going to say.
data and assumptions
Links to the source of prices, taken yesterday: heating oil price, gas rate family, price and features pellets (these data, the cost of pellets and its calorific value, are very varied, which take it as a simple ejemplillo) electricity tariffs (taxes painful watching Fenosa).
In combustion systems, the most efficient oil boiler or low temperature natural gas boiler condensate, involve working with the water system at a low temperature, not exceeding 40 º C. This implies the need to plant or oversized radiators at least 50%, or underfloor heating.
The boiler efficiency condensing natural gas is given on the lower heating value (LHV), when the whole is a result of combustion in the gas phase, while if it gets enough to take the heat in the flue gas finished condensing water, it recovers enough heat ( adds a PCI 11% in natural gas, only 6% for diesel due to its lower proportion of atomic hydrogen), and therefore leaves us efficiency greater than 100%, if we had measured in relation to the gross calorific value (upper limit that takes into account the condensation of water) would have given less than 100%, as expected. The heat produced by condensation is best understood backwards: to dry hands under a hair dryer, will not feel the heat (temperature) until they are dry, that is, while all the heat (energy) absorbed by the water to evaporate, is that heat (energy) that condensation is recovered either in the above result boiler combustion, heat pumps well-focused source of heat outside air when it already has a high relative humidity.
contracted power electrical systems I have set all to 5'75kW (its cost is included in the annual cost), but really expect a major power necessary for radiators / emitters direct electric heat pumps, and more for batteries (have to load all the warmth of days -10 hours, during the night -14 hours-) than for electric heaters. Of course radiators / emitters I mean from electric stoves electric oil heaters and heat halogen colorful (blue, green or whatever), and yes, everyone has an efficiency in heat generation of electricity from virtually 100% (virtually put if you really could measure the tiny part that electromagnetic radiation can escape.)
Regarding the distribution of consumption for Time Discrimination Rate (Residential) for all radiators / emitters, electric and heat pumps, this time, unlike ecological analysis of the heating , I must say that I have taken a pessimistic approach evenly distributing consumption 24 hours a day. Without doubt consumption of the heating on at the same temperature 24 hours, will be much higher at night and early morning (fare valley) during the day (price point), so expect better results than those exposed in these cases and we consider worst case. Moreover, in the case of heat pump with heat source of origin (the cold) air
external , the effect will be even more pronounced, since the efficiency of these increases when the temperature difference between inside and abroad decreases, ie, when electricity is more expensive. It can also be seen that the impact of the TDH is more pronounced (not proportional) the higher the consumption, this is due to the wonderful charge for excess consumption of the normal rate, which penalizes (from the last rate change) consumption over 500kWh in a month. In this case, normal rate, the figures given more electric heating costs will be worse. efficiency of heat pumps that I have had the two values, pessimistic, discussed in ecological analysis. Certainly a heat pump-water or water / water (the cold / hot reservoir, or heat source / destination of the heat) will most certainly a COP (Coefficient Of Performance , inflated by heat kWh electric kWh consumed) held (given the almost constant temperature of the cold) over 4 and in any case this type of heat pump is usually installed with underfloor heating, but certainly also be done with consoles and distributing guess (the latter not I've seen mentioned anywhere) through conduits (pipes usually by bringing the ceiling hot air).
Regarding heat pumps air / water (equal distribution of heat than the land / water and water / water) and air / air (typical reversible air conditioning distribution ducts inside or console), although its efficiency will vary along day with outside temperature, average efficiencies expected 250% best shown in the table. The air / water because they have sufficiently long periods of operation (can be sufficient room temperature water circuit on and off infrequently), while the air / DC Inverter air if it is kept in an operating system provide almost exactly the heat lost, which have fewer cycles on / off (in normal conditions until the quench any). Therefore expected average efficiencies of more than 3 machines COP Inverter DC (nominal position of 7 º C and 70% humidity outside, and 21 ° C inside blowing a rated capacity close to maximum) of 4 in climates not too severe.
consumption comparison chart of the types of heating
the end is trimmed (extraneous data such as factor taxes on electricity), but has interesting results.
Here OpenOffice spreadsheet (version 3) ( add here the link for the mule ), if you want to play with some numbers, or just get to see this table piece.
[I add the 27/IV/2010 version, with fares (gone, for example, excessive consumption in power) for the mule: OpenOffice spreadsheet ( link if you do not have eMule or similar ) and exportanción PDF file (ditto ). ]
Comment
results
The results speak for themselves, but having seen the table that I commented in 2003, must be said that heating oil (if you discount hiciesen 15%) is amazingly expensive (about all compared to natural gas) ... I have a errorcillo or somewhere that I have not found.
Something that really surprised me the comparison is quite normal boiler versus diesel electric radiators TDH. The little difference, even though he had discounted oil, certainly diluted the effect of homogeneous distribution of said power consumption within 24 hours, although that would certainly raise the contracted power.
In any case, the heat pump, including pessimistic version, and considering normal electricity tariff is almost on par with natural gas boiler condensing, or better than this and almost boiler TDH considering pellet. Yes, simply consider tierra-ó-agua/agua heat pump or heat pump air / air soft enough weather location (a few nights around freezing point), then we have the heat winner, even without TDH. Conclusion
If today we want an economic heating consumption or we opt for a biomass if we have the space and the availability of quality fuel at a good price or install a version of low-temperature diesel or natural gas condensate (underfloor heating or oversized radiators), supported by solar panels, or acquire the heat pump suited to our climate.
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