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efficient environmental heat, heat Heat green green

Certainly there are times when advertising and brand names rub the insult to the intelligence of our species, since it seems to be no illegality. Thus, direct electrical heating systems (radiators / emitters electric heat with or without color) come into play to add the falsity of low and / or any term that directly start with eco to make you believe uninformed consumer will not only save money, but also enhance the planet in general.

Well, perhaps the only place you might consider the direct electrical heating an ecological system would be in France, where over 80% of electricity is nuclear, and therefore use generates little amount of greenhouse gases. Yet it would be wasteful. That's why serious countries such as France, ( not, are not we ) try to promote the use of heat pump heating systems to achieve greater efficiency in resource use.

If we consider the case of Spain, we find that with a mix of electricity generation too focused on burning fossil fuels, using direct electrical heating is not only wasteful, it is anti-ecological, generate more greenhouse gases than if we burn fossil fuels directly in our house to keep warm.


What is the English mix?

You can consult the website of Red Electrica of Spain: https: / / demanda.ree.es / generacion_acumulada.html . Also, if you do them with the pointer over one of the lines between types, you put the numerical values. However, such data for today at 9:50 2/X/2008 are

• Hydraulics: 7.6%. Nuclear
• : 19'7%
• Fuel / Gas: 0.6%
• Coal: 17.5%
• Combined Cycle: 40.4%
• Wind: 3.7% Rest
• special regime: 12.7%

latter, special arrangements Rest, I guess that includes both solar energy cogeneration (ie, basically burning natural gas), but not broken do not go I will consider in the calculations.

being really optimistic, we can give an efficiency in electricity generation to 40% of Coal and Fuel / Gas and 60% that of combined cycle (natural gas). Therefore, and with a simple and inaccurate calculation, and neglecting the transmission losses and transformation of power from their point of origin to point of consumption, how many kWh of energy we must burn for us to reach our radiator 1 kWh / issuer direct electrical? (Yes, with how easy it is, conversion to electricity will heat impressively close to 100%, but do not rule out emission of electromagnetic waves paltry 50 Hz): Coal

• and Fuel / Gas : 1 / (40% kWh-eléctrico/kWh- burned ) = 1 / 0 '4 burned kWh / kWh = 2.5 kWh electrical burn / kWh-electric combined cycle
• : 1 / (60% kWh-eléctrico/kWh- burned ) = 1 / 0 '6 kWh burned / kWh-electric kWh = 1'66 burned / kWh-electric

Given the percentages in the generation we have: (17.5% +0.6%) x 2.5 + 40.4% x 1'66 + 42'04% x 0 = 1'1258 burned kWh / kWh-electric, that is, although considered a 42'04% generation of electricity from clean energy (big if given the mixture in Other special arrangements ) , yet is that we burn 12% more resources than we did the combustion directly into our house to warm and aprovechasemos all its heat. Certainly the heat using a boiler system and radiators water circuit, will not be used whole, ie, some is going in the gases resulting from burning or we are left in the boiler room. However, systems can be efficient as a natural gas boiler condensation working at low temperature and with good insulation, will surely have an efficiency of over 1 / 112 '58% = 88'82% kWh-calor-aprovechado/kWh - burned (rather be close to 95%), making it more environmentally friendly, for now, even with these optimistic assumptions for direct electric heating.


ecological heating

Obviously we consider the less we have to ecological burning, either in the corresponding power generation or in the boiler in our house.

Therefore, we have two one main technologies available today that allow us to increase very significantly kWh of heat obtained from burning 1 kWh- :

1. low temperature heating with solar support.
2. heat pump.

However, both solutions are not disjoint, but is seen as economically (ecologically possibly yes) implement cost-effective together.


Support solar

Assuming that we already have a heating system at low temperatures as can be, for example, condensing boiler over underfloor heating (the water will flow safely to 40 º C or less), the coupling to the circuit a solar thermal panels will reduce the heat to be produced by the boiler, running it just to support solar panels when they are not heating enough water (lots of clouds or at night).

Solutions with 50% heat input from the solar panels are not crazy, and allow, repairing the previous accounts assuming good 88'82% efficiency boiler system, 50% x = 0'5629 112'58% burned kWh / kWh-heat-exploited.

Certainly this type of facility is to be undertaken by the community for a building or houses.



heat pump heat
Making something cold to breathe somewhat counterintuitive hotter ... except that today we all have a fridge at home, and perhaps many air conditioning. Both the bar and in the air conditioning we are interested in the generation of cold, heat being the byproduct of which we have to fight either in the back of the refrigerator, well the compressor on the outside of air conditioning in this heat pump, heat, not the product but the purpose of the system, while the cold will be the byproduct.

heat pumps can be designed to get the heat from various media:

1. outside air,
2. floor, install it in depth with several wells, either extension tubes to shallow horizontal groundwater
3. .

By far the most popular in mild climates is the outside air, while more severe weather will be more efficient either past. The disadvantage of the outside air is precisely the variability of temperature (and humidity) and the lower efficiency of the heat pump higher temperature jump between the interior and exterior, while the other two operating under high temperature almost constant source of origin, but with the disadvantage installation of a much higher cost.

Also, the heat distribution can be done basically in two ways:

• directly into the air, along with the typical console air conditioning, along with the indoor unit from ceiling and duct distribution to various rooms,
• heating water circuit of low temperature, either by console or by underfloor heating, or both, extradimension well with radiators.

is in this last variant which could even be attached to the hot water system solar panels. Moreover, we can find a hybrid integrated heat pump more in so-called solar panels solar thermodynamic . Except the latter, the solution is potentially ambiguous, serving for heating in winter and cooling in summer.

efficiency heat pumps water source or ground source, can be placed to be pessimistic 3.5 kWh-heat for every kWh electricity consumed , while a heat pump air / air (air conditioning reversible ) Inverter DC could, being too pessimistic, leave it at 2.5 kWh per kWh-heat-electric. So, back to our eco-efficiency calculation, we would have for each of this pair of cases (certainly it is optimistic that the 1'1258):

-electric
• 1 kWh / (3.5 kWh-heat) x 1'1258 burned kWh / kWh-electric kWh = 0'3217 burned / kW-heat.
• 1 kWh / electric / (2.5 kWh-heat) x 1'1258 burned kWh / kWh-electric kWh = 0'4503 burned / kW-heat.

by these results is that serious in countries like Japan, not only advocate use of heat pumps for heating but increasingly efficient models (6 kWh-heat for 1 kWh electricity consumed here than in Europe or are), having already achieved reduce power consumption in both heating and air conditioning in recent years . Conclusion




heating What is organic? I think it is obvious that none of the heaters to bunting.

What is the most economical heating? This question will have to remain for another day, but I think I can go and making a clear idea of \u200b\u200bwhat the candidates (no, not any bright colors.) Certainly