38results about How to "Suppress supercooling" patented technology

The invention provides a composite phase-change thermal storage material. A porous material with high thermal conductivity is used as a supporting framework, and low-melting-point metal or low-melting-point metal with nano-particles is distributed in pores of the porous material, wherein melting point or solidus temperature of the low-melting-point metal is less than or equal to 80 DEG C; and thermal conductivity of the porous material is within 40-400 W/(m.K). The material provided by the invention has high equivalent thermal conductivity and high storage energy density; there is a large contact area between the liquid metal and the porous material; and the material has a wide application temperature range, has good fixability, stable physico-chemical property and good reversibility; and the problem of decreasing heat storage efficiency after multiple times of heat adsorption and release cycles is avoided.

The invention discloses a silicon nitride-modified phase-change and energy-storage microcapsule, comprising a shell material and a cladded core material, wherein the shell material comprises the following raw materials in parts by weight: 50-100 parts of high-molecular polymers and 1-20 parts of silicon nitride powder which is evenly dispersed into the high-molecular polymers; the core material comprises 50-100 parts of organic phase-change and energy-storage materials and 1-20 parts of silicon nitride powder which is evenly dispersed into the organic phase-change and energy-storage materials. The invention also provides a preparation method of the phase-change energy-storage microcapsule. The thermal conductivity of the phase-change and energy-storage material is improved, overheat and overcold degrees in the phase-change process are inhibited, and meanwhile, the thermal endurance and the abrasive resistance, the thermal shock resistance, the fatigue resistance and the like also are improved. The silicon nitride-modified phase-change and energy-storage microcapsule is relatively simple in preparation technology, available in raw materials, strong in controllability, and applicable to the industrial large-scale production, an existing industrial processing technology can be fully utilized, and the performance of the phase-change and energy-storage microcapsule is improved.

Freeze indicators can include an indicator dispersion, a liquid medium, indicator particles dispersed in the liquid medium and a particulate inorganic nucleating agent to inhibit supercooling of the liquid medium. The inorganic nucleating agent can have an ionic surface coating which can help provide a sharp end point. Optionally, freeze indicators can include indicator particles comprising an organic material and a softener to soften the indicator particles and provide the freeze indication with an enhanced visual appearance. Another option is to provide a temperature-sensitive stabilizer to inhibit coagulation of the indicator dispersion at temperatures above the liquid medium frozen state melting point while permitting coagulation of the indicator dispersion at the liquid medium frozen state melting point.

This secondary cooling device for a continuous casting machine is provided with a plurality of pairs of support roller and a plurality of nozzles, and each support roller has: a plurality of roller sections split in the widthwise direction of a cast strand; and grooves provided between the roller sections. The grooves provided to each upstream-side support roller and downstream-side support roller adjacent in the direction of conveyance are disposed offset from each other in the widthwise direction. A first nozzle among the plurality of nozzles is disposed at a first nozzle position set between a roller section provided to an upstream-side support roller and a groove provided to a downstream-side support roller.

A cooling system includes a compressor that circulates refrigerant; a condenser that condenses the refrigerant; an expansion valve that reduces a pressure of the refrigerant that has been condensed by the condenser; an evaporator that vaporizes the refrigerant that has been reduced in pressure by the expansion valve; a refrigerant passage through which the refrigerant flows from an outlet of the condenser toward an inlet of the expansion valve, and that includes a passage forming portion that forms part of the refrigerant passage; a second passage that is connected in parallel with the passage forming portion; a cooling portion that is provided in the second passage and cools a heat source using the refrigerant; and an expansion valve that is arranged upstream of the cooling portion in the second passage.

The invention provides a composite phase-transition heat-storage material and a preparation method thereof. A porous material with high thermal conductivity is used as a supporting framework, and low-melting-point metal or low-melting-point metal with nano-particles is distributed in pores of the porous material, wherein melting point or solidus temperature of the low-melting-point metal is less than or equal to 80 DEG C; and thermal conductivity of the porous material is within 40-400 W/(m.K). The material provided by the invention has high equivalent thermal conductivity and high storage energy density; there is a large contact area between the liquid metal and the porous material; and the material has a wide application temperature range, has good fixability, stable physico-chemical property and good reversibility; and the problem of decreasing heat storage efficiency after multiple times of heat adsorption and release cycles is avoided.

A mold capable of inhibiting supercooling is provided. A mold according to an exemplary aspect of the present invention includes a cooling channel formed therein and has a recess formed in a cavity surface. The mold includes a heat-insulating barrier formed between the cooling channel and a bottom surface of the recess formed in the cavity surface. The heat-insulating barrier includes a space formed between the cooling channel and the bottom surface of the recess formed in the cavity surface. The space is filled with a medium (for example, an air) having a thermal conductivity lower than that of other portions of the mold.

The invention discloses a self-heating type reactor used for hydrogen production by reforming and filled with a high-temperature phase-change material. The self-heating type reactor used for hydrogen production by reforming is formed by sequentially laminating an upper cover plate provided with a methanol steam reforming reactant inlet pipe and a methanol catalytic combustion reactant inlet pipe on the upper surface, a graphite washer, an upper evaporation plate, a graphite washer, a lower evaporation plate, a graphite washer, a methanol reforming heat absorbing plate for hydrogen production filled with the high-temperature phase-change material on the lower surface, a sealing plate, a graphite washer, a methanol catalytic combustion plate filled with the high-temperature phase-change material on the lower surface, a graphite washer and a lower cover plate provided with a reformed gas outlet pipe and a combustion tail gas outlet pipe on the lower surface from top to bottom. The heat stability of a self-heating reactor is effectively improved by means of latent heat of phase change of the high-temperature phase-change material, the temperature gradient in the reactor and the temperature fluctuation of the reactor during working are reduced, catalyst activity reduction and peeling caused by overheating of the reactor are inhibited, and the heat efficiency and the methanol conversion rate of the reactor are improved.

The invention discloses a low-carbon quasi-single crystal ingot furnace and a method for adopting the low-carbon quasi-single crystal ingot furnace for ingot casting. The low-carbon quasi-single crystal ingot furnace comprises a furnace body (1), a heat insulation cage (2) and a heat exchange table (9), wherein a crucible (7) is placed on the heat exchange table (9), the top of the crucible (7) is provided with heaters A (3), and heaters B (8) are distributed at the circumference of the crucible (7) and are connected with traction devices (12) through heater lifting rods (11). The method comprises five steps including material charging, heating melting, crystal growth, annealing and cooling. The low-carbon quasi-single crystal ingot furnace and the method have the advantages that the ingredient supercooling phenomenon caused by carbon content enriching in a solute boundary layer can be effectively inhibited, so the influence on the growth speed of quasi-single crystals caused by impurity enriching is reduced, and meanwhile, the content of carbon in quasi-single crystal ingots can be effectively reduced; and the generation and the growth of the fine crystal regions near the crucible wall can be effectively inhibited, so the quality of the quasi-single crystal ingots can be obviously improved, and the utilization rate of the ingots is improved.

The invention discloses a steel rail online induction heating control method. The steel rail online induction heating control method comprises the steps that induction heating is implemented to the steel rail web portion discharged out of the heat treatment line, and the heating temperature of the steel rail web portion ranges from 600 to 680 DEG C. According to the steel rail online induction heating control method, steel rail production is carried out, through the rail web compensation heating, the overcooling degree of the steel rail after online heat treatment is restrained, the staying time of the steel rail on the pearlite transition area can be prolonged, and generation of an abnormal martensite structure is avoided; through the rail web heating control, the temperature difference between the rail head and the rail bottom can be coordinated, the steel rail inner stress can be reduced, the steel rail straightening cracking risk is reduced, and the inner stress after steel rail straightening can be reduced. The method is easy and feasible and suitable for industrial production.

A heat exchanger has (i) a first passage in which a first fluid flows, (ii) a heat storage body that is thermally connected to the first passage and stores a warm heat or a cold heat, and (iii) a second passage that is thermally connected to both of the first passage and the heat storage body, the second passage in which a second fluid flows. The heat storage body changes to a first phase in a solid state when a temperature of the heat storage body is lower than or equal to a phase transition temperature, and changes to a second phase in a solid state when the temperature of the heat storage body exceeds the phase transition temperature. The heat storage body stores or dissipates heat depending on a phase transition between the first phase and the second phase.