PURPOSE: To provide an effective production of boiled state and improve a thermal conductivity by a method wherein there are provided an outer pipe and an inner pipe shorter than the outer pipe and located within an evaporating part of the outer pipe and an inner surface of the outer pipe is formed with a proper number of concave parts or projections corresponding to an outer surface at a lower end of the inner pipe.
CONSTITUTION: A cooling unit 3 is comprised of several copper pipes having a specified length arranged in parallel while being raised upright, an upper header pipe 31 and a lower header pipe communicating with an upper end and a lower end of each of the pipes 30 to each other. In this case, each of the pipes 30 is comprised of an outer pipe 30a and an inner pipe 30b arranged within the outer pipe 30a through a narrow flowing clearance 30c and having a length not reaching at its upper end to the upper header pipe 31. The inner pipe 30b is fixed by abutting some projections 30d substantially equally spaced apart circumferentially at its lower end against the outer pipe 30a. A proper number of concave portions 30e are formed at an inside part of the outer pipe 30a at positions corresponding to the outer surfaces of the lower end portions of the inner pipe 30b, these portions are functioned as boiling cavities and then working liquid is boiled up.
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IIDA YOSHITAKA
MABUCHI MINORU
OKUYAMA TETSUO
