1068results about How to "Small temperature fluctuations" patented technology

A fluorophor which comprises as a main component, an α type sialon crystal containing at least Li, A element (wherein A represents one or more elements selected from among Mn, Ce, Pr, Nd, Sm, Eu, Tb, Dy, Er, Tm and Yb), M element (wherein M represents one or more metal elements except Li and the A element), Si, Al, oxygen and nitrogen. The fluorophor has an a type sialon crystal structure which is represented by the general formulae: (Lix1, Ax2, Mx3)(Si12−(m+n)Alm+n)(OnN16−n) 1.2≦x1≦2.4 (1) 0.001≦x2≦0.4 (2) and 0≦x3≦1.0 (3), and has a luminescence peak at a wavelength in the range of 400 to 700 nm. The above phosphor is reduced in the lowering of brightness, and can be suitably used for a white LED and the like.

The invention discloses a heat pump type vehicle air conditioner having a battery heat management function, which comprises a main refrigerant circulating loop configured to allow a refrigerant to flow in a sequence from a compressor, through a vehicle outside heat exchanger and an expansion valve, to a vehicle inside heat exchanger, or configured to allow the refrigerant to flow in a sequence from the compressor, through the vehicle inside the exchanger and the expansion valve, to the vehicle outside exchanger; and a defrosting loop configured to allow the refrigerant compressed by the compressor to sequentially flow through a defrosting throttle valve, the vehicle outside heat exchanger and a gas-liquid separator and then back into the compressor. The heat pump type vehicle air conditioner having the battery heat management function, provided by the invention, has a good defrosting effect with short defrosting time and low inside-vehicle temperature fluctuation, and can provide favorable comfort.

The invention relates to a triad phase change and energy storage external thermal insulating system of an external wall and the job practice of the system. A boundary layer, an insulation layer, a crack shielding layer and a finishing coat are arranged from a basal wall to outside in sequence. The insulation layer comprises three layers, including a bonding insulation layer which is an insulation mortar layer, a stable insulation layer which is an insulation board and an active insulation layer which is a phase change and energy storage insulation mortar layer, which are bonded with each other from interior to exterior; wherein, the fine aggregate in the phase change and energy storage insulation mortar layer uses inorganic porous particle as vector, organic phase changed material is adsorbed and stored in the pore space, and the outside surface comprises the phase change and energy storage porous medium of polymer-based composite material film. The crack shielding layer comprises a crack shielding mortar with strengthened mesh inside, meanwhile, a clip is vertically penetrated into the basal wall from the outside of the strengthened mesh. The invention adopts a triad insulation structure as the structure and phase changeable energy-storage material as fixing material, which significantly improves the insulation effect of wall and is favorable for keeping stable indoor temperature and substantially saving the energy consumption of indoor air conditioner.

The invention relates to a frequency conversion control method for a heat pump water heater. The frequency conversion control method for the heat pump water heater is characterized by comprising the following steps of: performing frequency conversion control on a compressor of the heat pump water heater; performing frequency conversion control on a throttle mechanism of the heat pump water heater; performing frequency conversion control on a defrosting mechanism of the heat pump water heater; and performing frequency conversion control on an exhaust temperature of the heat pump water heater. The frequency conversion control method for the heat pump water heater has the advantages of high heating speed, few start-stop times, small temperature fluctuation of a water tank and energy conservation. At a high ambient temperature, the frequency of the compressor can be reduced and the circulating flow quantity of a system can be reduced, so that the suction pressure is reduced and the stable operation of the compressor is guaranteed. At a low ambient temperature, the circulating flow quantity of the system is increased by increasing the frequency of the compressor and the opening degree of an electronic expansion valve, the exhaust temperature is reduced and the compression ratio is reduced, so that the compressor can operate stably. In the defrosting process, the defrosting time is greatly shortened by increasing the circulating flow quantity of the system; and the frost can be removed completely, without the problem that the frost is accumulated into ice.

The invention relates to the heat-storing field of solar thermal power generation, especially to a high-thermal-conductivity heat-storing nanometer-particle-mixed molten salt, and a preparation method thereof. The molten salt consists of a sold heat-storing molten salt, a dispersant and nanometer particles, wherein the dispersant and the nanometer particles disperse uniformly in the heat-storing molten salt and a eutectiform structure is formed, and the nanometer particles coat the surface of the heat-storing molten salt crystal particle. By adding the nanometer particles into the sold heat-storing molten salt, and by utilizing quantum size effect, surface effect, small size effect and the like possessed by the nanometer particles, the thermal physical property of the molten salt as a heat-storing medium has a substantial change. The preparation method is simple in technological process and low in cost, can help to substantially promote heat conductivity and specific heat capacity of the conventional heat-storing molten salt and substantially improve heat stability of the molten salt in a high temperature section, and can help to promote a heat storage capacity and system security of a concentrating solar power generation system and reduce costs of construction and operation of a power station.

The related rare earth catalyst for conjugated diene has high catalytic activity even on low temperature, and benefit to obtain the product with high conversion ratio and yield. This product is convenient to apply and can control the polyreaction even there is 30% butadiene in system.

The invention discloses a refrigerator, which comprises a refrigerator body, a refrigerator door, a refrigeration evaporator, a freezing air duct, an axial fan, a temperature control chamber air inlet duct, a temperature control chamber air inlet guide plate, a temperature control chamber air return duct and a freezing evaporator, wherein a refrigeration compartment, a freezing compartment and a temperature control chamber are formed in the refrigerator body; the refrigeration evaporator is arranged in the refrigerator body; the refrigerator air duct is arranged in the refrigerator body and is provided with a first air duct opening and a second air duct opening; the axial fan is arranged at the first air duct opening; the temperature control chamber air inlet duct is provided with a first air inlet duct opening and a second air inlet duct opening; the temperature control chamber air inlet guide plate is arranged at the second air inlet duct opening and is away from the axial fan in a predetermined distance; the temperature control chamber air return duct is provided with a first air return duct opening and a second air return duct opening; and the freezing evaporator is arranged between the first air duct opening and the second air duct opening. The refrigerator provided by the embodiment of the invention has the advantages of low cost and energy consumption, reliable refrigeration performance, high energy efficiency, low noise, constant temperature and high humidity in the refrigeration compartment, and the like.

The invention discloses a defrosting system of an air cooling refrigerator and a defrosting control method of the defrosting system of the air cooling refrigerator. The defrosting system of the air cooling refrigerator comprises an evaporator, electric heating tubes, a controller, an evaporator temperature sensor, a water pan and a freezing chamber temperature sensor, one or more electric heating tubes are fixed to a heat exchange tube of the evaporator and connected with the controller, the evaporator wall face temperature sensor is arranged on the surface of the heat exchange tube of the evaporator and connected with the controller, the freezing chamber temperature sensor is installed on the inner wall of an air cooling refrigerator freezing chamber and connected with the controller, and the water pan is arranged under the evaporator. According to the control method of the defrosting system of the air cooling refrigerator, the controller is adopted to detect the temperature of the wall face of the evaporator and the temperature of the freezing chamber, and the detected temperatures are combined with the accumulated running time of a compressor or the total running time of the compressor to judge whether defrosting should be performed or not; when the temperature of refrigerant in the heat exchange tube T>=T3 or the defrosting time t>=t2, the defrosting process is stopped; when defrosting water is discharged out of the refrigerator, the refrigerator is started again to enter the next refrigerating circulation. According to the defrosting system and the defrosting method, defrosting is uniform, the defrosting time is shortened, the electric heating defrosting efficiency is improved, and energy consumption of the refrigerator is reduced.

The invention provides an air conditioner heating mode frequency control method. When a compressor of the air conditioner is in a heating mode, the compressor working frequency is corrected through a PID algorithm, and if the compressor is stopped, the compressor stopping starting initial frequency is determined through the outdoor environment temperature. By the aid of the method, the determination of the initial frequency can respond to temperature changes timely, and accordingly, the frequency can be improved and reduced effectively; the air conditioner running is stable, the indoor environment temperature fluctuation is small, the frequent starting and stopping of the compressor can be prevented, and the user experience is good; the running of the air conditioner is not affected by outside weather changes, frequency parameters can be adjusted according to weather conditions and are optimized through a large number of experiments, accurate initial frequencies can be given in special days, the frequency is adjusted according to the environment temperature, and accordingly, the air conditioner stable running can be guaranteed, and the temperature can be adjusted rapidly.