Heat Exchanger Perforated Fins

A PLATE FIN HEAT EXCHANGER COMPRISES A FOLDED FIN SHEET (10) COMPRISING FINS WHEREIN THE FIN SHEET (10) COMPRISES A PLURALITY OF PERFORATIONS (20), SUCH PLURALITY OF PERFORATIONS (20) ARE POSITIONED ON THE FIN SHEET (10) IN PARALLEL ROWS WHEN SUCH FIN SHEET (10) IS IN AN UNFOLDED STATE, SUCH PARALLEL ROWS OF PERFORATIONS ON THE FIN SHEET (10) COMPRISE A FIRST SPACING BETWEEN THE PARALLEL ROWS OF PERFORATIONS (S1), A SECOND SPACING BETWEEN SEQUENTIAL PERFORATIONS WITHIN THE PARALLEL ROWS OF PERFORATIONS (S2), A THIRD SPACING (OR OFFSET) BETWEEN THE PERFORATIONS IN ADJACENT PARALLEL ROWS OF PERFORATIONS (S3), AND A PERFORATION DIAMETER (D), WHEREIN THE RATIO OF THE FIRST SPACING BETWEEN THE PARALLEL ROWS OF PERFORATIONS TO THE PERFORATION DIAMETER (S1/D) IS IN THE RANGE OF 0.75 TO 2.0, AND WHEREIN THE ANGLE BETWEEN THE FINS AND THE PARALLEL ROWS OF PERFORATIONS IS LESS THAN OR EQUAL TO FIVE DEGREES (≤ 5°).