Screen heat exchanger

A screen heat exchanger having anisotropic heat conductivity comprising:

• a plurality of spacers having holes defining passages for fluids for heat exchange therebetween;
• screens made of a sheet material having a heat conductivity higher than that of said spacers, said spacers and said screens being arranged alternately and being rigidly connected into a bank;
• said screens including a plurality of elements forming a plurality of meshes on said screens, said elements being disposed within the space of each passage in the direction of heat transfer from one fluid to another fluid and inclined with respect to the place of said screens at an angle substantially in the range between 45.degree. and 90.degree., said elements of adjacent screens extending within one another without making contact;
• and at least two headers communicating with the passages of said bank and secured to the opposed ends of the bank for distributing the fluids along the passages of said bank.