71results about How to "Lower enthalpy" patented technology

Disclosed is a method and device to increase the cooling load that can be provided by a refrigerant-based thermal energy storage and cooling system with an improved arrangement of heat exchangers. This load increase is accomplished by circulating cold water surrounding a block of ice, used as the thermal energy storage medium, through a secondary heat exchanger where it condenses refrigerant vapor returning from a load. The refrigerant is then circulated through a primary heat exchanger within the block of ice where it is further cooled and condensed. This system is known as an internal/external melt system because the thermal energy, stored in the form of ice, is melted internally by a primary heat exchanger and externally by circulating cold water from the periphery of the block through a secondary heat exchanger.

Disclosed is a method and device for a refrigerant-based thermal energy storage and cooling system with multiple condensing units utilizing a common evaporator coil. The disclosed embodiments provide a refrigerant-based ice storage system with increased reliability, lower cost components, and reduced power consumption and ease of installation.

A refrigerant circuit (20) includes a low stage compressor (101, 102, 121, 122), a high stage compressor (41, 42, 43), an outdoor heat exchanger (44) and a utilization side heat exchanger (83, 93). During a defrosting operation of the refrigeration system (10), the high stage compressor (41, 42, 43) is driven. Refrigerant discharged from the high stage compressor (41, 42, 43) is pumped into the utilization side heat exchanger (83, 93) to heat frost on it from its inside. Thereafter, the refrigerant evaporates in the outdoor heat exchanger (44), is then compressed by the high stage compressor (41, 42, 43) and is sent again to the utilization side heat exchanger (83, 93).

When performing dehumidification heating of a space to be air-conditioned, a refrigeration cycle device is switched to a refrigerant circuit in which a flow of a refrigerant flowing out of an interior radiator is branched, and one of the branched refrigerants is decompressed by an interior expansion valve to evaporate in an interior evaporator, while the other of the branched refrigerants flows into a high-pressure side refrigerant passage of an internal heat exchanger and is then decompressed by an exterior expansion valve to evaporate in an exterior heat exchanger. Further, in the refrigerant circuit, a flow of the refrigerant flowing out of the interior evaporator and a flow of the refrigerant flowing out of the exterior heat exchanger are merged into a low-pressure side refrigerant passage of the internal heat exchanger. Thus, the refrigerant flowing into the interior evaporator is prevented from becoming a liquid-phase refrigerant having an unnecessarily high degree of supercooling, thereby achieving appropriate dehumidification heating.

The invention discloses an efficient condenser which comprises a shell. A condensation heat exchange area and a supercooling area are formed in the shell from top to bottom through a plurality of heat exchange pipes and a supercooling pipe. The condensation heat exchange area is divided into an upper layer and a lower layer. The heat exchange pipes on the upper layer and the lower layer are separated by a fluid baffle penetrating through supporting plates. The whole fluid baffle tilts by 10-15 degrees towards one side in the width direction. The condensation heat exchange area and the supercooling area are separated by a supercooling area upper sealing plate covering the supercooling area. According to the efficient condenser, due to the fact that the fluid baffle is arranged between the upper layer and the lower layer of the condensation heat exchange area and the supercooling area upper sealing plate is arranged between the condensation heat exchange area and the supercooling area, the thickness of fluid films outside the heat exchange pipes below the fluid baffle is effectively reduced, the heat exchange performance of the supercooling area is enhanced, and the energy efficiency of a refrigeration system is obviously improved.

A hot water heater or similar heating device includes equipment for pre-cooling hot flue gas while preheating water for the water heater. It further includes a heat and mass exchanger for transferring heat and water from the pre-cooled flue gas to combustion air for the hot water heater. The pre-cooler may comprise a separate device or may be incorporated as part of a condensing water heater. The heat and mass exchanger may use membranes having condensing sides and evaporating sides, which allow water to pass from the condensing sides to the evaporating sides. It may further comprise troughs for wetting the membranes.

The present invention provides a freezing circulate mechanism which can prevent the damage of the compressor and improve the freezing ability. The freezing circulate mechanism comprises a compressor (2) for compressing refrigerant; a condenser (3) for condensing the refrigerant compressed by the compressor; an expander (4) for expanding the refrigerant condensed by the condenser (3); a gas-liquid separator (10) which is used for separating the gas and liquid of the refrigerant from the expander and provided with a gas outlet (10c) for flowing out the gas refrigerant (G) and a liquid outlet (10b) for flowing out the liquid refrigerant (F); an evaporator (5) for evaporating the refrigerant flows from the liquid outlet; an accumulation device (6) arranged between the evaporator and the compressor for separating the gas and liquid of the refrigerant flows through the evaporator, and flowing out the separated gas refrigerant to the compressor, and accumulating the liquid refrigerant; and a gas bypass path (11) which is extending from the gas outlet and connected between the compressor and the accumulation device, and is provided with a liquid level control tubing leading-out from the gas-liquid separator and connected between the evaporator and the accumulation device.

The invention relates to a polylol compound phase-change material and a preparation method thereof. The compound phase-change material takes butantetraol, pentaerythrotol and xylitol powder as raw materials and is prepared through the following steps: carrying out manual grinding, ball milling or sand milling on a mixture of the butantetraol, the pentaerythrotol and the xylitol for 1h to 3h; then heating the mixture at 185 DEG C to 190 DEG C for 3h to 6h until all the powder is completely melted to form transparent liquid; finally, naturally cooling the transparent liquid to form the white and solid polylol compound phase-change material, wherein the mass percent content of the butantetraol is 60 percent to 75 percent, the mass percent content of the pentaerythrotol is 24 percent to 35 percent and the mass percent content of the xylitol is 1 percent to 5 percent. The polylol compound phase-change material has the advantages of high phase-change enthalpy value, small super-cooling degree, stable melting point and the like, and can be used in the fields of solar heat energy storage, industrial residual heat recycling and the like.

The invention relates to the technical field of phase change materials, in particular to a high thermal conductivity hydrated salt phase change material and a preparation method thereof. The preparation method comprises the following steps: preparing reduced graphene aqueous dispersion; mixing the reduced graphene aqueous dispersion with inorganic salt, and then carrying out ultrasonic treatment to obtain the high thermal conductivity hydrated salt phase change material. The hydrated salt phase change material has higher thermal conductivity, and meanwhile, the properties such as enthalpy value of the phase change material are less influenced. Furthermore, the preparation method provided by the invention is wide in application scope; all inorganic hydrated salt phase change energy storagematerials can be prepared into phase change materials with high thermal conductivity and low phase change enthalpy value reduction by utilizing the reduced graphene aqueous dispersions and corresponding salts thereof.

An expander-integrated compressor (5A) has a compression mechanism (21) for compressing a refrigerant and an expansion mechanism (22) for expanding the refrigerant. The compression mechanism (21) is located above the expansion mechanism (22) inside a closed casing (10) and shares a rotating shaft (36) with the expansion mechanism (22). An oil pump (37) is provided at the lower end of the rotating shaft (36). The oil pump (37) is immersed in oil in an oil reservoir (15). Usually, the oil is placed in the oil reservoir (15) in such a manner that the oil level (OL) is located above a lower end portion (34e) of a vane (34a) of a first expansion section (30a). More preferably, the oil is placed in such a manner that the expansion mechanism (22) is immersed in the oil. An oil supply passage (38) for guiding the oil to the compression mechanism (21) is formed inside the rotating shaft (36). A suction port (37a) of the oil pump (37) is provided below the lower end portion (34e) of the vane (34a).

The expander-compressor unit 70 includes the closed casing 1, the expansion mechanism 4 disposed in the closed casing 1 in such a manner that a surrounding space thereof is filled with the oil 60, the compression mechanism 2 disposed in the closed casing 1 in such a manner that the compression mechanism is positioned higher than the oil level 60p, the shaft 5 for coupling the compression mechanism 2 and the expansion mechanism 4 to each other, and the oil flow suppressing member 50 disposed in the surrounding space of the expansion mechanism 4 so that the space 55a filled with the oil 60 is formed between the expansion mechanism 4 and the oil flow suppressing member 50.

The invention discloses a preparation method of a high-thermal-conductivity super-hydrophobic phase change microcapsule. Melamine resin is used as a shell material, and n-alkane is used as a phase change core material. The preparation method comprises the following steps: firstly, carrying out graft modification on inorganic nanoparticles boron nitride and aluminum oxide with high heat conductivity coefficients by utilizing a silane coupling agent, so that the inorganic nanoparticles carry active groups such as amino and the like, can participate in cross-linking curing of a shell material, and have a certain hydrophilicity to increase the compatibility with a water-soluble melamine prepolymer; and then emulsifying the phase change core material by compounding an anionic emulsifier perfluorononenoxy sodium benzenesulfonate and a styrene-maleic anhydride copolymer, and then adding a mixed solution of the modified inorganic nanoparticles and a melamine prepolymer to finish surface cross-linking, curing and coating. The prepared phase change microcapsule is a monodisperse spherical particle, the heat conductivity coefficient can reach 0.562 W/(K.m), the water contact angle is 156 degrees, the phase change enthalpy value is 190 J/g, and the phase change microcapsule can serve as a hydrophobic energy storage material to be widely applied to the fields of functional textiles, building coatings and the like to achieve the purposes of energy conservation and environmental protection.

The invention relates to a method of performing a carbon dioxide absorption with reduced risk of aerosol formation from a carbon dioxide containing stream in an absorption apparatus having a specific sequence of sections and wherein the method comprises specific steps. Another aspect of the invention relates to a use of a structured packing as part of a carbon dioxide absorption section in an apparatus for the absorption of carbon dioxide, characterized in that the use is in reducing the risk of aerosol formation in a top region of the carbon dioxide-absorption section. Yet another aspect of the invention is a use of an absorption apparatus comprising a specific sequence of sections, wherein the use is for avoiding a super-saturation of a solvent and water and a risk of aerosol formation.

The invention discloses a self-healing hydrogel phase-change material and a preparation method thereof. The material comprises an inorganic phase-change material, a hydrogel base material, a nucleating agent and a crystal form modifier, wherein the hydrogel base material comprises a monomer with a self-healing function, a salt-tolerant monomer, a main cross-linking agent, an auxiliary cross-linking agent, an initiator and deionized water. The preparation method comprises the following steps: preparing an inorganic phase-change material melt; and uniformly dispersing a nucleating agent, a crystal form modifier, a cross-linking monomer and a cross-linking agent according to a certain proportion, finally adding a proper amount of deionized water and an initiator, and stirring and cross-linking. According to the invention, the self-healing hydrogel phase-change material is cross-linked and self-healed to form a hydrogel by using a monomer with a hydrogen bond, so that the hydrogel can be self-healed without external force even if the hydrogel is broken; and the hydrogel phase-change material has relatively high thermal conductivity, is low in price, is green and environment-friendly, and is simple in production process.

The invention provides a system for separating an ammonia and carbon dioxide mixed gas, comprises the following steps of: firstly, compressing the ammonia and carbon dioxide mixed gas, transmitting into a carbon dioxide separation tower after the pressure is increased to 15-25bar, and sequentially entering into a water separation tower and an ammonia separation tower. The system has the advantages that the electric energy consumed by compressing the tail gas is converted into the enthalpy of the tail gas, a great quantity of the released heat energy can be effectively used when the ammonia in the tail gas is absorbed by a carbon separation tower; and the system can isolate the dilute ammonia carbon water solution from the side line of the water separation tower, so that the load of the water separation tower can be greatly reduced, and the energy consumption can be reduced. Furthermore, the mixed gas is further compressed into a plurality of segments, and the intersegment cooling adopts a direct spray liquid cooling method, rather than an unconventional indirect water cooling method, so that the system has the advantages that the sensible heat is converted into the latent heat, however, the total enthalpy value of the logistics can be invariably kept. The fourth advantage of the system is to replace a cooler taking circulating cooling water as a cooling medium with an air cooler, so that the energy consumption can be reduced.