Pipe with ribs on its inner surface forming a multiple thread and steam generator for using the pipe

A fossil-fuel steam generator, comprising, a plurality of identically functioning pipes, each of said pipes having a pipe wall with an inner wall surface, and ribs disposed on said inner wall surface forming a multiple thread, said ribs defining a mean inside pipe diameter d measured in meters, and said ribs having a lead h measured in meters, said lead h being equal to between 0.8 and 0.9 times the square root of the mean inside pipe diameter d.

A solar-heated steam generator, comprising a plurality of pipes, each of said pipes having a pipe wall with an inner wall surface, and ribs disposed on said inner wall surface forming a multiple thread, said ribs defining a mean inside pipe diameter d measured in meters, and said ribs having a lead h measured in meters, said lead h being equal to between 0.8 and 0.9 times the square root of the mean inside pipe diameter d.

A waste heat steam generator, comprising a plurality of pipes, each of said pipes having a pipe wall with an inner wall surface, and ribs disposed on said inner wall surface forming a multiple thread, said ribs defining a mean inside pipe diameter d measured in meters, and said ribs having a lead h measured in meters, said lead being equal to between 0.8 and 0.9 times the square root of the mean inside pipe diameter.

A heat exchanger, comprising a plurality of pipes, each of said pipes having a pipe wall with an inner wall surface, and ribs disposed on said inner wall surface forming a multiple thread, said ribs defining a mean inside pipe diameter d measured in meters, and said ribs having a lead h measured in meters, said lead being equal to between 0.8 and 0.9 times the square root of the mean inside pipe diameter.

A heated steam generator for absorbing after-heat in a nuclear power plant, comprising a plurality of pipes, each of said pipes having a pipe wall with an inner wall surface, and ribs disposed on said inner wall surface forming a multiple thread, said ribs defining a mean inside pipe diameter d measured in meters, and said ribs having a lead h measured in meters, said lead being equal to between 0.8 and 0.9 times the square root of the mean inside pipe diameter d.

A pipe, comprising a pipe wall having an inner wall surface, and ribs disposed on said inner wall surface forming a multiple thread, said ribs defining a mean inside pipe diameter d measured in meters, and said ribs having a lead h measured in meters, said lead h being equal to substantially 0.9 times the square root of the mean inside pipe diameter d.

A fossil-fuel steam generator, comprising a plurality of identically functioning pipes, each of said pipes having a pipe wall with an inner wall surface, and ribs disposed on said inner wall surface forming a multiple thread, said ribs defining a mean inside pipe diameter d measured in meters, and said ribs having a lead h measured in meters, said lead h being equal to substantially 0.9 times the square root of the mean inside pipe diameter d.

A solar-heated steam generator, comprising a plurality of pipes, each of said pipes having a pipe wall with an inner wall surface, sand ribs disposed on said inner wall surface forming a multiple thread, said ribs defining a mean inside pipe diameter d measured in meters, and said ribs having a lead h measured in meters, said lead h being equal to substantially 0.9 times the square root of the mean inside pipe diameter d.

A waste heat steam generator, comprising a plurality of pipes, each of said pipes having a pipe wall with an inner wall surface, and ribs disposed on said inner wall surface forming a multiple thread, said ribs defining a mean inside pipe diameter d measure in meters, and said ribs having a lead h measured in meters, said lead being equal to substantially 0.9 times the square root of the mean inside pipe diameter.

A heat exchanger, comprising a plurality of pipes, each of said pipes having a pipe wall with an inner wall surface, and ribs disposed on said inner wall surface forming a multiple thread, said ribs defining a mean inside pipe diameter d measured in meters, and said ribs having a lead h measured in meters, said lead being equal to substantially 0.9 times the square root of the mean inside pipe diameter.

A heated steam generator for absorbing after-heat in a nuclear power plant, comprising plurality of pipes, each of said pipes having a pipes wall with an inner wall surface and ribs disposed on said inner wall surface forming a multiple thread, said ribs defining a mean inside pipe diameter d measured in meters, and said ribs having a lead h measured in metes, said lead being equal to substantially 0.9 times the square root of the mean inside pipe diameter d.