How Does it Work?

Homebuilding & Renovating - - The Brief Ground Source Heat Pumps -

A mix­ture of wa­ter and anti-freeze is pumped around a ground ar­ray (ei­ther ver­ti­cal, left, or hor­i­zon­tal,

be­low) and ab­sorbs so­lar en­ergy stored in the ground. Heat is ex­tracted us­ing com­pres­sion and ex­pan­sion tech­nol­ogy; this heat is then made avail­able to heat the house.

Man­u­fac­tur­ers ad­vise that a GSHP can in­crease the tem­per­a­ture from the ground to around 65°C, but to get over about 50°C the sys­tem may re­quire the use of an elec­tric heater (al­though Kensa’s Shoe­box range, for ex­am­ple, can reach these higher tem­per­a­tures with­out an elec­tric heater). The hot­ter the wa­ter en­ter­ing the house, the more elec­tric­ity will be used, re­duc­ing the ef­fi­ciency of the heat pump. This is why heat pumps are bet­ter suited to un­der­floor heat­ing than ra­di­a­tors.

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