The size of a heat pump that you can use for a pool which is 18 feet wide by 33 feet long and has a depth of 4.5 feet can vary depending on specific brand of heat pump you wish to purchase. The minimum size of heat pump for an above ground pool of this size in 102,000 BTU.
Heat deep under the ground.
Your regular cover won't heat the pool, it will hold the heat, but it will not heat it up. You need a solar blanket if you are looking for something to warm your pool.
Geothermal energy, using the heat from under the ground.
Give it a name.
mainly because they are rated on BTU size...
Geothermal energy uses heat from deep under the ground.
Hot rocks deep under the ground are used to heat water which is then pumped up and used to generate electricity. EARTH
Geothermal heat is head taken from the Earths crust usually in volcanic areas ar heat that comes up in springs from deep under the ground.
Heat from magma and pressure from above ground.
Radiation. However, the heat transfer here isn't exclusively radiation; the warm ground tends to warm the air next to the ground (conduction) and the warm air rises and mixes with the cooler air above (convection). So all three modes of heat transfer are involved. Here's an example of strictly radiative heat transfer. On a cold cloudy night, the warmer ground radiates heat to the cooler clouds, but the temperature difference is only a few tens of degrees, so not much heat is transferred. On a cold CLEAR night, the heat from the warm ground is radiated to deep space, with a temperature close to absolute zero, a difference of 400+ degrees. So it gets a lot colder on clear night than it does on a cloudy night!
130000 btu
No