The temperature of the media flowing in the pipe up to the supply point.
The temperature of the media flowing in the pipe back to the supply point.
Refers to the temperature of the surrounding soil.
Refers to the pipe where media flows.
The protective insulated pipe surrounding the media pipe.
Refers to the deep center of the pipe is away from the ground surface.
The inner diameter of the media pipe and the casing pipe respectively.
The outer diameter of the media tube and the casing pipe respectively.
Also referred to as heat conductivity and is defined as the heat flow passing through the material per unit of time. The values needed are for the media tube, sheath tube, ground as well as for the insulating material that fills the space between the media and sheath tubes usually a polyurethane insulation (PUR).
The distance between the forward and return lines center to center.
The heat loss that occurs from the two pipes to the surrounding ground.