ABSTRACT
This chapter describes how, regardless of the lower heat source selected, heat pumps can be used in agriculture and their functionality is same. Lakes are geological forms that are formed due to several geological activities related to volcanism, tectonism, glaciation and erosion, and wind erosion. Lakes can be formed during the evolution of river basins, sea coast changes and meteoritic impact. At human life scale, they may seem a permanent form in landscape, but at geological scale lakes are an ephemeral form of water retention. The easiest available source of low-temperature heat is atmospheric air, which is often used in heat pump installations. Because air has a low coefficient of heat transfer and high temperature fluctuation both daily and annually, it should be applied only to power evaporator heat pumps with low-to-medium power. Heat absorption from ground to power an evaporator is generally done through a secondary heat transfer medium, which flows through the so-called exchanger ground forced circulation pump.
