SU616521A1 - Heat-exchanging pipe - Google Patents

Description

(54) HEAT EXCHANGE PIPE

The invention relates to heat engineering, and more specifically to condensers with steam condensation from an air-steam mixture or the outer surface of pipes, with the movement of cooling fluid inside the pipes. Heat transfer tubes are known that are provided on the outer surface with a groove of a triangular profile in the form of a spiral 1. However, such pipes have a low heat transfer coefficient, since their outer surface does not have smooth sections, the pipe grooves are filled with a condensate film. Without a condensate film, only vertices between adjacent grooves work) have no significant effect on heat transfer from steam to water. The purpose of the invention is to increase the heat transfer coefficient. This is achieved by the fact that the pitch of the helix is equal to the double width of the groove, whose depth of tie exceeds 0.5 the thickness of the pipe wall. With this, the groove profile is an equilateral triangle, which increases the efficiency of heat transfer due to the absence of a film of condensate on the surface of the pipe. The drawing shows the proposed heat exchange pipe, a general view. The heat exchange pipe has a smooth inner surface 1. On the outer surface of the pipe there are grooves 2 of a triangular profile in the form of a spiral, between which spiral cylindrical skirts 3 are formed. The pitch of the helix is equal to twice the width of the groove, while the width of shear 3 is equal to the width of the grooves 2 along the top, the depth of the grooves does not exceed 0.5 pipe wall thickness. The angle at the apex of the 4 grooves 2 is approximately 60. The pipe can be chickpea whole, the grooves are formed by cutting or knurling, the profile of the grooves is an equilateral triangle. During the operation of the pipe, cooling water is passed through it, across the outside

O1k pipe axes; hoaig pen or vapor-air seam.

The centers of lioHfK-HcauHK steam appear in the gyr-shears 4 helix1LGohx grooves 2s as the most cooled compared to the remote from surface 1 strip 3. The droplets formed in the condensation centers draw the condensate from the sandwich 3 and 4 sections removed from the top of the grooves 2 are enlarged and broken off the pipe. No condensate film is formed on the pipe surface.

Due to the operation of the outer surface of the pipe without a film and condensate, the heat transfer from the steam-air mixture to the cooled pipe wall increases by 6 ~ -7 0% o

Claims (2)

Isobregin formula 1, Tbploobmenna pipe, premturnesch. of the condenser, provided on the external surface with a groove of a three-sided profile E in the form of a helix, about This is due to the fact that, in order to increase the heat transfer coefficient of the heat source, the pitch of the helix is equal to the double width of the groove, the depth of which does not exceed the maximum wall thickness of the pipe. 2. A pipe according to Clause 1, of which there is a TeMj that the profile of the grooves is an equilateral triangle. Sources of information taken into account in the examination: 1 USSR author's certificate No. 423547, class, F 28 F 1/10, 1972.