Reversible grooved tubes for heat exchangers
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United States of America Patent
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May 23, 2006
Grant Date -
Sep 18, 2003
app pub date -
Apr 12, 2002
filing date -
Mar 12, 2002
priority date (Note) -
Expired
status (Latency Note)
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Abstract
Grooved metal tubes (1), of outer diameter De, the tubes being grooved internally with N helical ribs (2) of an apex angle .alpha., height H, base width L.sub.N and helical angle .beta., two consecutive ribs being separated by a flat-bottomed groove (3) of width L.sub.R, with a pitch P equal to L.sub.R+L.sub.N. These tubes are characterised in that, a) De is between 4 and 20 mm, b) the number N of ribs ranges from 46 to 98, c) the rib height H ranges from 0.18 mm to 0.40 mm, d) the apex angle .alpha. ranges from 15.degree. to 30.degree., e) the helical angle .beta. ranges from 18.degree. to 35.degree.. These tubes make it possible to simultaneously obtain a high heat exchange coefficient in evaporation and condensation and a low pressure loss.
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