Heat transfer element assembly

An assembly of heat transfer element for a heat exchanger comprising a plurality of first heat absorbent plates and a plurality of second heat absorbent plates stacked alternately in spaced relationship thereby providing a plurality of passageways between adjacent first and second plates for flowing a heat exchange fluid therebetween;

• and spacers maintained a predetermined distance between adjacent plates, said spacers comprising bilobed folds in said first and second plates, the folds in said first plates having their first lobe projecting outwardly from said first plate in a first direction and their second lobe projecting outwardly from said first plate in a second direction opposite to the first direction, and the folds in said second plates having their first lobe projecting outwardly from said second plate in the second direction and their second lobe projecting outwardly from said second plate in the first direction, the folds in said second plates thereby having a pitch opposite to the pitch of the folds in said first plate so as to preclude adjacent first and second plates from nesting.