<p>In a perforated heat conductive surface structure having voids (13) under an outer surface (10) and openings (16) in the outer surface (10), in order to obtain a high performance in particular at a low pressure and low temperature region, there is provided a heat transfer wall in which a thickness of a wall at a ceiling of each void and a length of a passage (15) of the respective openings (16) are increased in predetermined ranges.</p>
