52results about How to "Enhanced heat transfer properties" patented technology

The invention relates to an MZI type optical waveguide hybrid integrated thermo-optical switch with a graphene doped trapezoidal cladding, and a preparation method of the switch, and belongs to the technical field of optical waveguide type thermo-optical switch preparation. The method comprises the following steps: spin-coating a silicon dioxide substrate with a photosensitive polymer core layer material; performing photoetching on the photosensitive polymer core layer material by adopting a mask to obtain an optical waveguide core layer; then performing spin-coating of a graphene-doped polymer cladding material, evaporating of a metal film, spin-coating of a photoresist, registering and photoetching, and developing to prepare an electrode pattern; and finally performing cleavage so as toprepare the MZI type optical waveguide hybrid integrated thermo-optical switch with the graphene-doped trapezoidal cladding on the substrate. According to the method, the trapezoidal cladding structure is used for replacing a flat cladding structure, so that the heating efficiency of an electrode is improved; and the polymer material doped with single-layer graphene dispersion liquid is adopted toreplace a traditional polymer material, so that the problems of high power consumption and long switch time caused by low heat conductivity of polymer are solved. The method has the excellent effectsof simple process flow, high preparation precision and the like.

The invention relates to a magnetic nano-fluid light condensation type photovoltaic combined heat and power generation device. The magnetic nano-fluid light condensation type photovoltaic combined heat and power generation device comprises a photovoltaic cell assembly module, a heat storage assembly, a photo-thermal assembly and a magnetic field adjusting assembly; the heat storage assembly comprises a heat reservoir and a heat exchange pipe; the heat reservoir is internally provided with phase change media; an inlet and an outlet of the heat exchange pipe are exposed out of the heat reservoir; the photo-thermal assembly comprises a circulating pump, a first header, a second header, multiple transparent heat gathering pipes, multiple uniform light bodies, Fresnel lenses and a framework; the uniform light bodies are polygon prisms; the area of the upper surface of the polygon prisms is greater than that of the bottom of the polygon prisms; the magnetic field adjusting assembly comprises S-shaped magnets and coils wound around the arms of the S-shaped magnets, one heat gathering pipe is arranged between the arms of every two adjacent magnets, and the S-shaped magnets and the heat gathering pipes are located on the same plane; the heat exchange pipe, the heat gathering pipes, the circulating pump, the first header and the second header are all internally provided with nano-fluid which can circulate and flow. The magnetic nano-fluid light condensation type photovoltaic combined heat and power generation device has the advantages of being simple in structure, capable of improving the solar energy utilization ratio, and the like.

The invention discloses a rotary air preheater heat transfer corrugated plate with interrupted holes and a processing method for the rotary air preheater heat transfer corrugated plate. The interrupted holes are formed in the rotary air preheater heat transfer corrugated plate; the rotary air preheater heat transfer corrugated plate is formed by alternately overlapping a first locating plate and a second locating plate; the second locating plate is 0.4-0.8mm thick; the first locating plate is formed by connecting an incision and a ripple with each other; the first locating plate is 0.4-0.8mm thick; the interrupted holes are round and rectangular in shape, and the size, the spacing and the arrangement mode of the interrupted holes are comprehensively obtained after being verified by the strict technical design and experimental results; by forming the round interrupted holes in the carbon steel flat plate, and then, rolling is performed through a corrugated roller to form the rotary air preheater heat transfer corrugated plate with the interrupted holes. According to the novel rotary air preheater heat transfer corrugated plate with the interrupted holes, the heat-transfer characteristic of the existing rotary air preheater heat transfer corrugated plate can be effectively improved, and the flow resistance in the channel of the existing rotary air preheater heat transfer corrugated plate is reduced, and meanwhile, steel consumption required for processing the rotary air preheater heat transfer corrugated plate is reduced.