Ven­ti­la­tion sys­tems – do they re­ally re­cover heat?

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If you want a true en­ergy re­cov­ery ven­ti­la­tor for your home, ome, a bal­anced sys­tem with a real heat ex­changer is the only y way to truly re­cover en­ergy which is usu­ally wasted, to warm or cool your home. This is no more ev­i­dent than in the nd­ings of a com­pre­hen­sive Otago Univer­sity Re­port com­mis­sioned d for EECA (En­ergy Ef ciency and Con­ser­va­tion Au­thor­ity), ity), re­search­ing the heat­ing and cool­ing po­ten­tial of ven­ti­la­tion la­tion sys­tems. The study car­ried out by the Depart­ment of Physics at Otago Univer­sity was pub­lished in May 2011. The re­port speci cally eci cally fo­cused on cur­rent do­mes­tic res­i­den­tial sys­tems, mea­sur­ing asur­ing the amount of heat­ing and cool­ing avail­able for cap­ture ure from roof space air. The re­port states, “the ma­jor­ity of the time, it was cal­cu­lated that pump­ing air from the roof space into the house would pro­vide no heat­ing or cool­ing bene t.” If you are look­ing to pur­chase a ven­ti­la­tion sys­tem and nd you are con­sid­er­ing heat re­cov­ery as part of this, make sure you do your home­work. Most ven­ti­la­tion sys­tems will work rk best in con­junc­tion with an­other heat source such as a heat t pump. The best sys­tems on the mar­ket are those that re­cover ver heat through a heat ex­changer. This means that the stale e air is passed over the fresh air, re­cov­er­ing en­ergy from the he air be­ing ex­tracted to sup­ply your home with fresh, tem­pered mpered air.

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