Geothermal installation on water table in 2013?

[danielj]

IMPORTANT: that you extract the calories from the water table (difficult to have sufficient flow!) Or from the air (there you can have the flow since it is enough to increase the power of the fan ...), the machine must have its air or water discharge greater than zero ° C, if not we freeze, it blocks the exchanger, so the machine ... (there I repeat:}

The theoretical COP is theoretical and does not take into account the efficiency of the compressors, the motors, the regulation, the heat losses, the defrosting system, the too high or too low temperature limits of fluids, the expenses of energy to bring calories ... etc ... But, it's a very good argument for sellers
A + friends

why defrost? since we are talking about a heat pump on a water table whose temperature is always sufficient

why not a cop of 4?

with a cold source at 10 ° and a floor heating at 30 ° the theoretical maximum cop is impressive

cop = 1 / (1 - Tfroid / Tchaud)
Tfroid = 273 + 10 ° = 283K
Tchaud = 273 + 40 ° = 313K

cop = 1 / (1 - 283/313) = 10,4

of course in real life nothing is perfect, and this theoretical maximum will not be reached, it is still easy to get half so cop = 5

it is even possible to do better than half of the theoretical cop, but alas what is currently found in the trade is not glorious ... both too expensive and not very efficient ... there are still things to invent