Abstract: A passive stream regulating system applicable to air-flue gas or water-flue gas heat exchangers, preferably natural gas balanced flue or natural flue home heaters and home boilers, which allows to attain non-over oxygenated stoichiometric mixture conditions. The system is included by small diameter tubes or other geometric systems formed by small channels, to produce a strong laminarization of the aerodynamic flow established within the venting tube, which are located in sections of the conduit or passage of incoming cold air to the combustion chamber of the exchanger or in sections of the conduit or passage of hot flue gases released to the environment.

Abstract: A sunroof, which is adapted to provide either home passive heating by solar accumulation or passive refrigeration due to its particular structure that additionally provides insulation conditions from the external environment. The sunroof allows incorporating heating and refrigeration during construction of homes for users looking for biosustainable solutions in the long term at present reasonable prices and included in moderately innovative products. The sunroof is comprised by structural sheets (preferable metallic) over which substantially parallel first and second transparent laminar elements are positioned, defining between such sheets and the first laminar elements a first chamber, and forming between first and second laminar elements a second watertight chamber; the first chamber is capable of being filled with water as the external and upper surface of the second transparent laminar element, which is filled with water or opaque and/or reflective liquids.

Abstract: A gaseous diffusion enrichment modular unit and gaseous diffusion enrichment plant, comprehending a gaseous diffusion enrichment unit of the enrichment cascade type, being an integrated module containing all the elements of the unit, with several flows of circulation with different enrichment degrees, comprehending an axial compressor in simultaneous work of compression of said flows, a diffuser with membranes. The diffused (enriched) fluid passes through to the compressor in another section to accomplish the following enrichment phase and the non-diffused flow outlet is connected to an injector to even the pressures and to recycle the depleted material. Said modular unit of isotopic enrichment integrates multiple enrichment phases to achieve a high separative efficiency by means of the internal recirculation of a fraction of the diffused fluid in each phase.