40results about How to "Large working temperature zone" patented technology

The invention discloses a control method for a combined refrigerating multi-split air conditioner system. The multi-split air conditioner system is characterized in that two or more outdoor combined refrigerating modules are arranged the outdoor side to form a cold source system of the multi-split air conditioner system, each outdoor combined refrigerating module is composed of a first refrigerant vapor compression and refrigeration circulating loop and a second refrigerant circulating loop, one or more direct evaporation type indoor air cooler modules are arranged at the indoor side, and a refrigerant storing and conveying unit is connected with the part between each outdoor combined refrigerating module and the corresponding indoor air cooler module to form a closed circulating system through a liquid collecting tube, a main liquid supply tube and a main air return tube. According to the control method for the combined refrigerating multi-split air conditioner system, the number of the indoor and outdoor modules is decided according to the designed thermal load of an air conditioner, and the control method precisely regulates the refrigerating capacity to meet the heat control needs of round-the-clock running data machine rooms and electronic equipment; the control method for the combined refrigerating multi-split air conditioner system is capable of making the maximum use of the natural cold source of the day and night, transition season and winter so as to realize the great energy conservation and emission reduction of the air conditioner system.

The invention discloses an optical module working parameter adjusting method and an adjusting device. The method comprises the following steps of: detecting and obtaining an ambient temperature value; obtaining a reference bias current value and a reference modulated current value, which need to be compensated; when the ambient temperature value is more than a set temperature threshold value, obtaining an actual bias current compensated value and a modulated current compensated value by using a scaling factor which is not more than 1; when the ambient temperature value is not more than the set temperature threshold value, directly using the reference bias current value and the reference modulated current value as the actual bias current compensated value and the actual modulated current compensated value, respectively; and compensating a bias current and a modulated current of a laser according to the actual bias current compensated value and the actual modulated current compensated value. Through different adjustments carried out on working parameters under different conditions, a problem that the laser is degraded in performance and even damaged due to laser saturation can be solved.

The invention discloses a control method of a combined type air-conditioning system with a natural cooling function. The control method of the combined type air-conditioning system with the natural cooling function is characterized in that the system comprises a compressor module, an air-cooling heat exchange module, a multifunctional liquid storage device, a liquid pump, an air treatment module and control valves, wherein the air-cooling heat exchange module is composed of a heat exchanger assembly and a cooling fan; and the control method comprises the step that the three different work modes including a compression refrigeration work mode, a compression refrigeration and natural cooling coordinated operation combined refrigeration work mode and the natural cooling work mode are achieved by operating the control valves to change the flowing path of refrigeration media. According to the control method of the combined type air-conditioning system with the natural cooling function, fuzzy control is used for adjusting the refrigeration capacity, natural cooling is used for replacing compression refrigeration in low-temperature or transition seasons, natural cold resources are efficiently utilized, the control method is particularly suitable for control over the work environments of data centers, high-performance computers, communication base stations and power electronic equipment, and the energy consumption and operating cost of the air-conditioning system are greatly reduced.

The invention provides a noble metal doped SnO2 composite material and a preparation method thereof. The method comprises: (1) SnO2 superfine powder is mixed with noble metal powder with mass fraction ranging from 0.05 to 1.21, deionized water with mass fraction ranging from 20 to 40 percent is added to and stirred with the mixture into slurry, and the noble metal is one of or the mixture of two or more of Pd, Au, Cu and La or Ce; (2) the slurry is evenly coated on a ceramic substrate and is dried in a baking oven; and (3) the ceramic substrate is put into a muffle furnace and is sintered for 1 hour at the temperature from 600 to 700 DEG C, and after the room temperature is realized by furnace cooling, the noble metal doped SnO2 composite material can be obtained. Compared with common SnO2 materials, the noble metals doped in the invention, such as Pd, Au, Cu, La and Ce, and the like, can reduce the activation energy of adsorption of chemical gas, and can obviously improve the sensitivity and the response time of the SnO2 material.

The invention discloses a current liquid-changing material of intercalation kaolin/modified titanium oxide nanometer composite particle, which is characterized by the following: adopting formamide intercalation kaolin micrometer particle as core of dispersing phase; making chromium ion modified titanium oxide nanometer particle as micrometer/nanometer nuclear shell structure particle of clad layer; improving TauE/eta0 value of current liquid-changing material and physical value excited by electric field; increasing sediment-proof property; displaying the relationship of cutting stress and electric field strength of different dispersing particle currents in the accompanying diagram.

The invention relates to a method for preparing current liquid-change material, especially relating to a titanium oxide/acidamide derivative nanometer current liquid-change material. Compared with former relative method, the inventive current liquid-change material uses glacial acetic acid to restrain the hydrolyzation of butyl titanate, and prevents the reunite of nanometer particles via adjusting the pH value of solution and adding surface activator, The invention has easy operation and lower cost, which the prepared diffused phased material is core-shell nanometer particles that the nanometer titanium oxide particles is basic core, and the acidamide derivative with high dielectric constant is the coating layer. Said structure can improve the dielectric property and conducting property of material to make the current liquid-change have some excellent properties: strong current change effect, better anti-deposition stability, lower electricity density, and better chemical stability. The figure displays the relationship between diffused phased particle current liquid-change shear stress with different coating structures and the electric field intensity.

The invention relates to kaolin/TiO2 nanotube composite particle electrorheological fluid materials, compared with the conventional materials, the prepared electrorheological liquid discontinuous phase material has unique structure and a shape similar to cactus, wherein the porcelain clay is used as the base stock, the TiO2 nanotube is distributed onto the surface of the porcelain clay. The structure can be applied for improving the dielectric property and electrical conductance of the material.

The invention discloses an electromagnetic clutch active control contact type thermal switch device for a low temperature system. The electromagnetic clutch active control contact type thermal switch device comprises a cold end connecting plate, a left side plate, a thermal bridge, an upper sliding rod, a lower sliding rod, a first electromagnet, a second electromagnet, electromagnetic pure iron, a support rod, a right side plate and a hot end connecting plate. Whether the thermal bridge is in contact with thermally conductive blocks of the cold and hot end connecting plates or not corresponds to the on/off state of the thermal switch. The electromagnetic clutch active control contact type thermal switch device of the invention has the technical advantages of freely controllable on-off, fast response, large switching ratio, wide controllable temperature range, simple structure, easy operation and the like, and can be widely applied in the technical fields of low temperature physics research, cryogenic temperature calibration, space refrigeration and so forth.

The invention belongs to the field of magnetic refrigeration, and particularly relates to a temperature-graded magnetic heating material and a preparation method thereof. The temperature-graded magnetic heating material comprises a Ni50Mn37Sn13 alloy film layer and a Ni50Mn35In15 alloy film layer. The phase change temperature of the Ni50Mn37Sn13 alloy film layer ranges from 295 K to 305 K. The phase change temperature of the Ni50Mn35In15 alloy film layer ranges from 301 K to 310 K. The thickness ratio of the Ni50Mn37Sn13 alloy film layer to the Ni50Mn35In15 alloy film layer is 1:3 to 3:1. According to the temperature-graded magnetic heating material and the preparation method thereof, by carrying out gradient design and preparation on the magnetic heating material, the work temperature zone of an existing magnetic heating material can be expanded, and the magnetic heating effect of the material can be improved; and a design rule and a regulating and control mechanism of the magnetic heating material are set up, and the gradient magnetic heating temperature material is pushed to develop towards application.

The invention relates to a thin film material with a high electrocaloric effect near room temperature and a preparation method thereof, the chemical general formula of the thin film material is (1-x)Ba(Ti0.8Zr0.2)O<3-x>(Ba0.7Ca0.3)TiO<3-y>Sn, the value range of x is 0.1-0.7, and the value range of y is 0-0.06. The (1-x)Ba(Ti0.8Zr0.2)O<3-x>(Ba0.7Ca0.3)TiO<3-y>Sn thin film material provided by the invention has multiphase coexistence near room temperature, with the introduction of Sn, the Curie temperature is reduced, so that the (1-x)Ba(Ti0.8Zr0.2)O<3-x>(Ba0.7Ca0.3)TiO<3-y>Sn thin film materialobtains large electrocaloric temperature change near room temperature, thereby facilitating the enlarging of the working temperature range; and the material is good in application prospect in the field of electric card refrigeration devices.

The invention discloses an MLCC (multilayer ceramic capacitor) dielectric material with an excellent insulation characteristic. BaTiO3 powder serves as a base material, components including, in percentage by mass, 0.3%-0.8% of Na0.5Bi0.5TiO3, 0-1.5% of (NiO)(1-x)(NbO2.5)x, 0-0.5% of (MnO)(1-y)(NbO2.5)y and 1.0%-3.0% of CaZrO3 are added, wherein x ranges from 0.6 to 0.8, and y ranges from 0.4 to 0.6. BaTiO3 powder serves as the base material, Na0.5Bi0.5TiO3 is added, and a BT-NBT mixture is prepared after calcination; (NiO)(1-x)(NbO2.5)x, (MnO)(1-y)(NbO2.5)y and CaZrO3 are added to the BT-NBT mixture, the mixture is subjected to ball milling, dried, sieved, granulated and pressed into a green body, the green body is calcined in the nitrogen and hydrogen mixed atmosphere at the temperature of 1,300-1,320 DEG C, and the MLCC dielectric material is prepared. The MLCC dielectric material has the capacitance change rate smaller than or equal to plus or minus 15%, high dielectric constant (41729), lower dielectric loss (0.026) and the resistivity higher than 1011 omega.cm within the temperature zone of subzero 55-150 DEG C.

The invention relates to the technical field of heat pipes, and discloses a liquid metal pulse heat pipe. The liquid metal pulse heat pipe comprises a pipe body, a rising pipeline and a returning pipeline; a heating chamber and a heat dissipation chamber which are independent mutually are sequentially constructed in the pipe body from bottom to top, and a low-boiling-point working medium and liquid metal are arranged in the heating chamber from top to bottom in a layered mode; the rising pipeline is arranged in the pipe body and penetrates through the heating chamber and the heat dissipation chamber; the returning pipeline is arranged in the pipe body and penetrates through the heating chamber and the heat dissipation chamber; and the returning pipeline and the rising pipeline are arrangedin a spaced mode. By heating the heating chamber, the low-boiling-point working medium is heated and evaporated into a gaseous work medium, and under the effect of the gas pressure, the liquid metaland the gaseous work medium are alternately conveyed from the heating chamber to the heat dissipation chamber along the rising pipeline in a segmented mode, and then conveyed from the heat dissipationchamber back to the heating chamber along the return pipeline; and the liquid metal pulse heat pipe has the advantages of high heat transfer efficiency and large heat transfer limit.

The invention discloses a bismuth titanate-based bismuth layered structure lead-free piezoelectric ceramic with a negative electrocaloric effect and a preparation method thereof. The chemical composition of the bismuth titanate-based bismuth layered structure lead-free piezoelectric ceramic is Bi<4-x>Ce<x>Ti<2.98> (WNb)<0.01>O<12>, wherein x is more than 0 and less than or equal to 0.07. The bismuth titanate-based bismuth layered structure lead-free piezoelectric ceramic has the characteristics of wide working temperature range and large negative electrocaloric effect, does not cause harm to the ecological environment and human health in the preparing, using and discarding processes, and is suitable for development of miniature refrigerators in the future.

The invention discloses a carbon-dioxide-combined-type heat pump hot water and air conditioning system and a control method thereof. The system consists of a carbon dioxide heat pump unit, a freon circulation unit and a water storage box, wherein the carbon dioxide heat pump unit adopts carbon dioxide as a refrigerating agent and forms a first heat pump circulation loop; and the freon circulation unit adopts freon as a refrigerating agent, and a gateable second heat pump circulation loop, a heat pump and refrigeration circulation loop and a refrigeration air conditioning circulation loop are formed by utilizing a four-way valve and each switching valve. By adopting the carbon-dioxide-combined-type heat pump hot water and air conditioning system and the control method thereof, different working modes of heating, cooling and hot water supplying can be realized in a wide temperature zone in the whole year; and stable, reliable and energy-saving operation of the system is ensured.