It is not one and here's why!
Then conditions the pump motor is powered by a renewable source you (PV, solar stirling ...), it is simply untrue to talk energy 100% renewable or it must say renewable 1-1 / COP or 100-100 / COP%! Thus, an average COP of 3 give renewable heat pump 2 / 3 or 66%! The third or% being electricity network, it rarely renewable!
Warning, this reasoning is true for solar systems but also the COP them vary between 70 and 100 and may be more ... Indeed 10m² (thus 10 recoverable 000W about when the sun is there, so that the pump runs) with a circulator and a regu consuming 100W it gives a COP of 100 (yes to compare 3 to 5 given by the PAC ...) ...In the case of solar, the% of non-renewable quickly becomes insignificant ... but not in the case of CAP
Some points of reflection for those who "hesitate" on the choice of their heating currently:
A) from an oil boiler with a heat pump, your electric bill may be multiplied by ... surprise! We understand better the pub made by EdF and sellers of electricity for this solution!
-> Not economical
B) If your electricity is produced from coal or oil, the overall performance will be worse CO2 with a light fuel oil boiler efficiency of thermal power plants, transmission losses and COP of your CAP.
-> Surely not ecological
C) If your electricity is nuclear, you certainly decrease your energy bill (but pay your taxes in nuclear anyway) but you fund maintained and the revival of the French nuclear fleet.
-> ecological?
D) Maintenance costs are high and adding to your electricity bill: 2 300 to 2 € all year!
-> Not economical
E) The return on investment (for renovation) is usually 10 to 20 years without correction of the electricity price rise. Work (horizontal ground-water) are quite substantial in case of renovation, generally impossible financially.
-> Risky
F) The performance data by installers are generally the best performance ... laboratory (commes consumption data by auto manufacturers rarely achieved in real life ...)
-> Risky
G) Do you know a lot of fridges that last 30 years? A heat pump is a complex system with moving parts and fluids that can "wear out" ... This goes against a well-known adage of building professionals: the simpler it is the longer it lasts . I'm not even talking about Chinese PACs that are coming to the market ...
-> Risky
H) For horizontal sensor, the deposit is not infinite since you cool your garden ... in some cases ca ... can be annoying when there is snow cover for example! Geothermal energy, surface, is an indirect solar energy! The volume average calorific value of the land is equivalent to the water ... doing your calculations before you ...
-> Risky
I) A bit daring but I dare: what are the consequences on biodiversity in your garden if the T ° of the land is reduced by 10 ° C?
To end on good points there still are some advantages to the CAP:
A) In the event of a vertical deposit (drawing from the water table), the hot spring is much more constant and this eliminates a significant cost of earthworks and the inconvenience of exhaustion of the deposit ... but to make a vertical collection, it must be "well" placed.
B) Compared to conventional convectors éconologiquement PACs are much more efficient (yet happy) ... but the cost of return on investment is very important (convectors € 30, 200 ball to an equipped house for € 2000 ... it makes 10 000 € under a small heat pump ... and 10 000 € ca ... actually kwh)
C) Allows low temperature heating with "overall" efficiency of the higher system.
D) Improved overall performance quite easily with a PAC Inverter (hot + cold), but if and only if replacing electric heaters!
Warning: Never having used a PAC at home, I hope that some of my "prejudices" are false ... Correct me please
Edit: article https://www.econologie.com/chauffage-the ... -4361.html
) Ah ... if all the pros were also honnète ... the world would be better!