NOVELTY - The device has a providing unit transferring geothermal heat from an interior of earth to geothermal material chambers (3). A conveying unit conveys geothermal heat to a bottom end of an inlet pipe from the earth surface to the chambers. A controlling unit controls speed, volume and velocity of geothermal material in the chambers and pipes that are interconnected with one-direction control valves (5). A determining unit determines an amount of geothermal heat required. An enabling unit allows the material to be circulated and reused through a geothermal heat harnessing process.    USE - Device for harvesting a geothermal energy in a spiral energy harvesting system of an isaakidis high temperature engineered geothermal system e.g. isaakidis high temperature engineered geothermal single energy harvesting chamber system and isaakidis high temperature engineered geothermal parallel energy harvesting chamber system, at geothermal well and geothermal boreholes in an earth surface.    ADVANTAGE - The device can provide an alternate controlled way of trapping a geothermal energy that can convert and control the temperature and pressure into different phases of heated or superheated material in the chambers so as to produce large amounts of reliable renewable power at low cost without burning fossil fuels, thus enhancing the device in ecological and environmental manner. The chambers create and retain pressure, volume and temperature of the geothermal material at pre-set levels so as to enable the geothermal heat and energy to travel from the chamber to another chamber deep beneath the earth's interior to the earth's surface without requiring to rely on pumps.    DETAILED DESCRIPTION - The geo-thermal material is gas and liquid.    DESCRIPTION OF DRAWING(S) - The drawing shows a cross-sectional view of a spiral energy harvesting system of an isaakidis high temperature engineered geothermal system.    Material chambers (3)    One-direction control valves (5)    Outlet (10)    Energy converting plant (14)    Insulation (16)