Stepped self-convection condenser

A stepped self-convection condenser, comprising:

• a stepped heat absorbing pipe,
• a stepped steam pipe, wherein the stepped heat absorbing pipe and the stepped steam pipe are coaxially sleeved to form stepped sleeved pipelines;
• and a diameter of the stepped heat absorbing pipe is smaller than a diameter of the stepped steam pipe;
• a curved water collecting pipe, wherein each layer of the sleeved pipelines is connected to another layer of the sleeved pipelines in series in a stepped staggered manner and placed on an inclined flat plate with a given gradient J, each two of the stepped sleeved pipelines in each layer are connected to each other by a sleeved U-shaped pipe, and each two layers of the stepped sleeved pipelines are connected to each other by the sleeved U-shaped pipe and the curved water collecting pipe;
• and a shape of the curved water collecting pipe satisfies an equation of elliptic revolution as follows:
• (
• x
• 2
• +
• y
• 2
• )
• +
• (
• z
• -
• d
• v
• )
• 2
• 2
• =
• (
• d
• v
• 4
• )
• 2
• ;
• where x, y and z represent three directions that constitute a spatial coordinate system, with a direction setting satisfying the right-hand rule of a Cartesian coordinate system;
• a condensed water collecting chamber connected with the curved water collecting pipe and provided with an air valve and a water outlet;
• and
• a heat insulation shell, wherein the condensed water collecting chamber and the stepped sleeved pipeline are arranged in the heat insulation shell, the condensed water collecting chamber is located in the shell near a bottom of the shell, and the stepped sleeved pipeline is located above the condensed water collecting chamber;
• wherein a diameter dl of the heat absorbing pipe and a diameter dv of the steam pipe satisfy a formula
• d
• l
• =
• d
• v
• 1
• +
• T
• r
• ;
• with a heat transfer ratio
• T
• r
• =
• h
• l
• h
• v
• ,
• hl and jv represent a cold water heat transfer coefficient and a steam heat transfer coefficient, respectively;
• cold water naturally flows from top to bottom in the stepped heat absorbing pipe, and steam naturally flows from bottom to top between the stepped heat absorbing pipe and the stepped steam pipe, forming bifacial all-natural convection heat transfer inside and outside.