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Multitubular Heat Pipe® - a New Concept in the Heat Pipe Field

      Many industrial applications that involve heat transfer take advantage of heat pipes property to eliminate the possibility of cross-contamination. The heat pipes are usually welded in two separate special plates installed on the side of each thermal agent involved in heat transfer. Thus, the thermal agents, the heat absorbing fluid and the heat releasing fluid, are impossible to mix each other as a result of tubes corrosion.
      In case of large heat transfer rates and high pressures the heat pipes welding to the separating plates is very difficult or impossible to perform because of the small distance between the tubes walls which is an essential condition for realizing high flowing speed and thus high heat transfer coefficients. This disadvantage is removed by applying the Multitubular Heat Pipe® concept.
      The Multitubular Heat Pipe® concept was created mainly for applications in crude oil industry and refineries, but it can be applied in any suitable industrial field.
      The constraints of applications in crude oil industry and refineries required mainly two types of Multitubular Heat Pipe®:  Multitubular Heat Pipe® - Vertical Concept and Multitubular Heat Pipe® - Almost Horizontal Concept.

Multitubular Heat Pipe® - Vertical Concept

     The Multitubular Heat Pipe® - Vertical Concept is made mainly of two bundles of tubes. One bundle is placed on the heat releasing fluid side that passes between the jacket and the tubes releasing the required heat rate. The other bundle is placed also in a jacket on the heat absorbing fluid side that passes between the jacket and the tubes absorbing the required heat rate.
      When the vaporization section of the Multitubular Heat Pipe® is heated the working fluid turns to vapor absorbing the latent heat from the heat releasing fluid. The hot vapor flows up through the central tube and down through the bundle of tubes where it condenses and gives out the latent heat. The condensate then flows back through the external special tube to the vaporization section. Since the latent heat of evaporation is usually very large, considerable quantities of heat can be transported with a very small temperature difference from the heat releasing fluid to the heat absorbing fluid.
      The Multitubular Heat Pipe® is a completely passive device as well as the conventional heat pipe. It is not restricted to a fixed operating temperature but adjusts its working temperature according to the heat load and the sink condition.  
      The Multitubular Heat Pipe® - Vertical Concept is designed mainly to process applications in crude oil industry or for final heating heavy fuel oil at burners in power stations.

Multitubular Heat Pipe® - Almost Horizontal Concept