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115results about How to "Good heat transfer performance" patented technology

Flooded evaporator

A flooded evaporator is provided which can remove floating mist more exactly resulting in that the refrigerant mist is prevented from being sucked into the compressor, and with which heat transfer between the medium to be cooled and refrigerant liquid is improved. The evaporator is composed such that; a tubular housing (3) is provided to erect from a horizontal cylindrical container (1) which forms a heat exchanging section with a heat exchanger (2) accommodated therein, an inner tube (12) for upwardly guiding refrigerant vapor generated in the heat exchanging section is provided, the inner tube (2) is covered by a loose cover (13) so that refrigerant vapor containing refrigerant mist flowed up in the inner tube (12) impinges against the loose cover (13) to be deflected downward to flow out from the inner tube (12), a space (17) is secured in the tubular housing (3) to allow refrigerant mist to fall down utilizing gravitational attraction, a demister (16) is provided in the tubular housing (3) above the space (17), the clearance area between the inner tube (12) and loose cover (13) is smaller than the clearance area between the outer periphery of the loose cover (13) and inner periphery of the tubular housing (3), and circulation paths (20) of refrigerant liquid are formed in the container (1).
Owner:MAYEKAWA MFG CO LTD

Mixed working medium cascade power generation and remaining cooling capacity output system and method utilizing liquefied natural gas (LNG) cold energy

The invention relates to a mixed working medium cascade power generation and remaining cooling capacity output system and method utilizing liquefied natural gas (LNG) cold energy. The system comprises an LNG vaporizing side, a primary ternary mixing working medium Rankine cycle, a secondary ternary mixing working medium Rankine cycle and a third-level two-element mixing working medium Rankine cycle. The secondary ternary mixing working medium Rankine cycle is embedded in the primary ternary mixing working medium Rankine cycle, and the third-level two-element mixing working medium Rankine cycle is independent from the primary ternary mixing working medium Rankine cycle and the secondary ternary mixing working medium Rankine cycle. Compared with the prior art, the system has the beneficial effects that the whole LNG cold energy utilizing system structure is not too complex, meanwhile, organic mixing working media are adopted, the available energy loss existing in the heat exchanging process of all links is reduced as much as possible, a refrigerant heat exchanging link is introduced into the system, the cold capacity loss problem caused by the fact that the working media and LNG directly exchange heat with a hot source is relieved, and the cooling capacity acquired from the system by refrigerant can be used for other cold capacity demand approaches.
Owner:SHANGHAI JIAO TONG UNIV

Highly effective complete aluminum alloy heat exchanger

The invention relates to the technical field of heat exchangers, in particular to a high-efficient all aluminum alloy heat exchanger which comprises a housing, and a main fluid inlet pipe, a main fluid outlet pipe, a heat exchanging medium inlet pipe and a heat exchanging medium outlet pipe, which are connected externally with the housing. At least one all aluminum alloy heat exchanging sheet which is formed by the extrusion process is arranged in the housing; each heat exchanging sheet is provided with a heat exchanging fin and a nick; the middle of each heat exchanging sheet is provided with a seamless millipore passage in the length direction; the seamless millipore passage and the main fluid inlet pipe are communicated with the main fluid outlet pipe so as to form a main fluid passage; and clearances between the nicks of the heat exchanging sheets and the heat exchanging fins, clearances between adjacent heat exchanging sheets, the heat exchanging medium inlet pipe and the heat exchanging medium outlet pipe together form a heat exchanging medium passage. The invention has the advantages of good heat transfer performance, high voltage resistance, low temperature resistance, low cost and stable operation, can be used in oil refining engineering, chemical engineering, low temperature engineering, liquefaction of natural gas, liquid vaporization, gas separation and other industrial fields, and can be used for super-low temperature gas liquefaction or liquid vaporization.
Owner:张伟君

Nanofluid seawater desalination system using air as heat transfer medium

The invention discloses a nanofluid seawater desalination system using air as a heat transfer medium; air enters vortex pipes through an air compressor and an air diverter; hot end outlets of the vortex pipes are connected with a first effect seawater distiller; cold air enters a second condenser; seawater and nanoparticles are mixed in a seawater pool, and then the mixture enters a nanofluid diverter and is divided into a first condenser, a second preheater and a third preheater. Nanofluid outlets of all the preheaters are connected with a nanofluid inlet of the first effect seawater distiller. Hot air coming out of the first effect seawater distiller is used as a heat source of the third preheater; water steam of a former effect seawater distiller is used as a heat source of a next effect seawater distiller; a thick nanofluid of the former effect seawater distiller flows to the next effect seawater distiller; a thick nanofluid and water steam coming out of the final effect seawater distiller are respectively used as a heat source of the second preheater and a heat source of a first preheater; water steam and fresh water are condensed through the first condenser and the second condenser; and high efficiency and energy saving are achieved.
Owner:CHONGQING UNIV

High-temperature-uniformity heat radiator for navigation satellite

The invention discloses a high-temperature-uniformity heat radiator for a navigation satellite and belongs to the technical field of spacecraft heat control. A temperature radiator comprises a honeycomb plate, more than two U-shaped heat tubes, heaters and peripheral equipment, wherein the peripheral equipment is a rubidium clock; the straight tube section of each U-shaped heat tube consists of a tube body and a fin; the cross section of each U-shaped heat tube is T-shaped; the U-shaped section of each U-shaped heat tube only comprises the tube body of the corresponding straight tube section; the U-shaped heat tubes are embedded into the honeycomb plate; the upper surfaces of the fins and the lower surfaces of the tube bodies are respectively attached to the upper and lower inner surfaces of the honeycomb plate; the U-shaped heat tubes are nested with each other, so that the straight tube sections of the U-shaped heat tubes in the honeycomb plate are adjacently arranged; the surface of the honeycomb plate corresponding to the adjacent arrangement area of the straight tube sections serves as an installation area of the rubidium clock; the heaters are uniformly arranged on the tube bodies of the straight tube sections of the U-shaped heat tubes and are used for providing compensation heating amount for the heat radiator. The efficient heat transfer, heat dissipation and heat balance of the temperature radiator can be realized, and requirements on the environment temperature control accuracy of the rubidium atomic clock are met.
Owner:BEIJING INST OF SPACECRAFT SYST ENG

Method for preparing elemental tellurium based composite pyroelectric material

The invention relates to a method for preparing an elemental tellurium based composite pyroelectric material and belongs to the field of pyroelectric materials. The pyroelectric material is characterized by having a chemical formula of Te1-x(Sb2Se3)x, wherein x is not smaller than 0 and not greater than 0.2. The preparation method disclosed by the invention comprises the following steps: weighingvarious raw material ingredients according to a mole fraction proportioning ratio of the chemical formula, and encapsulating Te cakes, Sb powder and Se powder into a carbon-plated quartz tube throughvacuum encapsulation; then, smelting the quartz tube in a vertical tube type furnace; then, carrying out annealing treatment; and finally, grinding an obtained cast ingot into fine powder, then, carrying out spark plasma sintering, so as to obtain dense mass which has very low thermal conductivity and relatively high pyroelectric properties, wherein the pyroelectric Q-value reaches 0.95. Accordingto the method, the pyroelectric properties of the elemental tellurium based composite pyroelectric material are improved through a smelting process, an annealing process and a spark plasma sinteringprocess. Compared with the prior art, the method has the advantages that through introducing an antimony selenide component, the cooperated optimization of carrier concentration and lattice thermal conductivity is achieved, and the process flow is simple and controllable and is low in cost.
Owner:TAIYUAN UNIV OF TECH

Passive terrestrial heat type snow and ice melting device and construction process thereof

The invention discloses a passive terrestrial heat type snow and ice melting device which comprises a pavement heating pipe group, wherein the pavement heating pipe group is transversely buried on a shallow ground surface; horizontal headers which are parallel to the length direction of a pavement and buried pipe groups which are buried vertically and deeply are arranged on two sides of a pavementto be heated; both the pavement heating pipe group and the buried pipe groups are connected with the horizontal headers; water pumps are mounted on the horizontal headers; the pavement heating pipe group consists of a main pipe and branch pipes; the main pipe is mounted on the outer side of the pavement and is parallel to the length direction of the pavement; the main pipe comprises an outer pipeand an inner pipe which are nested together; an inorganic heat conduction medium layer is arranged between the inner pipe and the outer pipe; the branch pipes are communicated with an inner cavity between the inner pipe and the outer pipe of the main pipe; the horizontal headers are connected with the inner pipe of the main pipe of the pavement heating pipe group; heat accumulated by the horizontal headers is conducted to the inner pipe of the pavement heating pipe group and is used for heating the inorganic heat conduction medium between the inner pipe and the outer pipe; and the heat is conducted to a pavement surface from the branch pipes of the pavement heating pipe group, and thus snow and ice melting can be achieved. The invention further discloses a construction process of the device.
Owner:SHANDONG YATEER GROUP

Preparation method and application of high-purity chloride molten salt

InactiveCN109207128AMitigates corrosive effectsEasy to prepareHeat-exchange elementsPotassiumImpurity
The invention relates to a preparation method of a high-purity chloride molten salt. The method is: providing an untreated chloride molten salt having a purity of 95% or more; heating the untreated chloride molten salt to a liquid state to obtain a molten chloride molten salt; adding an active metal into the molten chloride molten salt, standing to allow the active metal and water and oxidizing impurities in the untreated chloride molten salt to respectively perform redox reaction to generate precipitates, wherein the active metal comprise at least one of lithium, potassium, calcium, sodium, magnesium, aluminum, zinc and iron; the oxidizing impurities comprise OH<->, SO4 < 2->, SO4 < 2->, NO3 < 3-> and NO2 < 2->; filtering and removing residual solid-state active metals and precipitates inthe molten chloride molten salt so as to obtain the high-purity chloride molten salt, wherein the high-purity chloride molten salt contains the dissolved active metals. The invention also relates toapplication of the high-purity chloride molten salt. The preparation method of the high-purity chloride molten salt provided by the invention is simple, is safe and solves the problem that a structural material is easy to corrode in the molten salt and restricts the industrial large-scale application of the chloride molten salt.
Owner:SHANGHAI INST OF APPLIED PHYSICS - CHINESE ACAD OF SCI
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