673 results about "Refrigeration temperature" patented technology

Reusable and recyclable target temperature storage and shipping containers designed to maintain the content therein within desired temperature levels for greatly extended periods of time are disclosed. A First species is customized to maintain refrigeration temperatures for extended periods of time and the Second species maintains freezing temperatures for extended periods of time. Both species models include containers having outer protective layers and inner insulating layers as well as a cavity for holding payload being stored or shipped, and one or more areas for holding passive coolants in a predetermined relationship to the products within specific target temperatures. The different species provide cold or freezing temperatures in reusable or disposable models for various applications. The main containers are substantially airtight when sealed for storage or shipping and includes an outer box, inner insulation, internal dividers, and different temperature controlling coolants designed for various temperature maintenance requirements of temperature-sensitive content.

The invention provides a condensation prevention method for an air conditioner, a controller, a system and the air conditioner, and relates to the technical field of air conditioners. The condensation prevention method for the air conditioner comprises the steps that whether an air deflector reaches the condensation critical condition or not is judged according to at least one of the temperature of the air deflector and the set refrigeration temperature, the environment temperature and the ambient humidity, wherein the condensation critical condition comprises the critical temperature difference when condensation occurs under each humidity condition; and if the air deflector reaches the condensation critical condition, the condensation prevention mode is started. According to the method, whether the condition for generating condensation is reached or not can be judged according to the ambient humidity, the temperature, the temperature of the air deflector and the set refrigeration temperature, generation of the condensation can be determined in time, the air conditioner is adjusted to enter the condensation prevention mode under the condition that the condensation is determined to be generated, and therefore the generation of the condensation on the air deflector of an indoor unit can be reduced.

Insulated pallet shipper and methods of making and using the same. The insulated pallet shipper includes an insulated container shaped to include a bottom wall, a top wall, a left side wall, a right side wall, a rear wall and a front wall, the walls collectively defining a cavity; a plurality of coolant members positioned in the cavity, each of the coolant members including a plurality of coolant bricks encased within a cardboard container, at least some of the coolant members being preconditioned at a refrigerating temperature and at least some of the coolant members being preconditioned at a freezing temperature; an inner pallet seated on the bottom wall; and an outer pallet upon which the container is seated.

The invention discloses a multiple online control method and system. The method comprises the steps that the set temperature and the indoor environment temperature of each indoor unit are obtained, and the temperature difference is calculated; the comprehensive temperature difference is calculated; a refrigeration modification value ETS / a heating modification value CTS is calculated according to the comprehensive temperature difference; and the evaporation temperature / condensation temperature is modified, and the frequency of each compressor is adjusted. According to the multiple online control method, the frequency of each compressor is adjusted according to the modified evaporation temperature / refrigeration temperature, energy is saved, and meanwhile the refrigerating / heating effect of each indoor unit can be guaranteed. When the requirement for each indoor unit is low, the frequency of the corresponding compressor is reduced, the corresponding compressor runs at the low frequency and is kept running with the low output in a low energy consumption manner, the corresponding compressor is protected against start stop, and accordingly power rise caused by start stop of the corresponding compressor is avoided. Meanwhile, the indoor units continuously run, so that the indoor temperature is maintained near the set temperature, the constant indoor temperature is achieved, a good refrigerating / heating effect is guaranteed, and the comfort degree is improved.

Beverage products are disclosed comprising at least one fruit juice, at least one sweetener, probiotic bacteria, and beta-glucan, where the beverage product has a pH of at most 4.5 and an acid level of 0.5%-1.0%. In certain exemplary and non-limiting embodiments, the beverage product has the characteristic that if tested after 45 days of storage in hermetically sealed individually sized 12 fl. oz. PET vessels stored in the dark or in otherwise UV shielded conditions at a refrigeration temperature of 35° F. the beverage product has an increased shelf life when compared to the same beverage product without beta glucan. Methods are provided for making such beverage products with extended probiotic stability.

A process for producing pasteurized liquid egg product utilizing a vat or tank for holding raw egg product. The raw egg product is preheated as rapidly as possible to a temperature of about 140 DEG F. and then, without holding the temperature at a constant level, the preheated raw egg is transferred to a suitable package. The package containing the preheated raw egg product is then sealed and heated and maintained at a suitable temperature in order to pasteurize the liquid raw egg products in the packages. The heated containers and pasteurized liquid egg product are then cooled rapidly to a refrigeration temperature to further inhibit germination of any remaining bacterial spores. The containers are then stored in refrigeration conditions for distribution and use. In another embodiment, an egg product package is preheated to a temperature between 71.1 DEG C. and 55 DEG C. and then hot filled with a egg product treated to about the same temperatures as the package. The hot filled package is then sealed and allowed to stand for about 30 seconds and then it is rapidly cooled to at least about 5 DEG C. in a cooling time period of about 5 mintues.

The invention provides an intelligent medicine chest which comprises a chest body provided with a plurality of drawer type medicine storage cabins, and a sensor is connected with a control unit and is suitable for detecting the medicine weight parameter and temperature parameter of each medicine storage cabin; a refrigeration temperature control unit is connected with a control unit and is suitable for controlling the temperature of each medicine storage cabin; a detection unit is connected with the control unit and is suitable for recognizing parameter information of medicine in each medicine storage cabin; a human-computer interaction unit is connected with the control unit and is suitable for sending medicine storage and taking commands and setting work parameters of the medicine storage cabins; an execution unit is connected with the control unit and is suitable for opening or closing corresponding medicine storage cabins according to the medicine storage and taking commands. By means of the intelligent medicine chest, the medicine temperature and weight of the medicine storage cabins are monitored; the preservation temperature of the medicine storage cabins is adjusted, whether each type of medicine is sufficient or not is determined according to the medicine weight, and a user is reminded whether repurchase is needed again or not; meanwhile, when the user opens the corresponding medicine storage cabin to take medicine, the use mode of the corresponding medicine is broadcasted, and the purpose of guiding the user is achieved.

A water-cooled auxiliary condenser device 200 receives refrigerant from an external refrigeration system 210 just downstream from its air-cooled condenser 110. The refrigerant passes through a water-cooled condenser 250, and the refrigerant state is sensed by a temperature or pressure sensor 226. If the sensed state of the refrigerant rises above a first threshold, the flow of water through the water-cooled condenser 250 is increased, e.g., turned ON, using a controllable water valve 234. When the sensed state of the refrigerant drops below a second threshold, the water flow through the water-cooled condenser 250 is decreased, e.g., turned OFF. The refrigerant returns to the refrigeration system just upstream from its liquid receiver 120. In the event that air-cooled condenser 110 fails, device 200 automatically activates the water-cooled condenser 250 to maintain safe refrigeration temperatures in the appliance. When not required, device 200 remains passive and does not use any water or electric.

A ready to bake refrigerated batter containing one or more food grade edible hydrocolloids and having a high yield stress value at refrigeration temperature (>1500 Pa@ 4.5° C.). The batter bakes into products with specific volumes, textures, and overall product quality typical of bakery products made from conventional low yield stress batters. With a high yield stress value, the batter is stiff and sliceable; therefore, it can be formed into shapes convenient for the end user to bake. The stiff, sliceable batter can be used to make muffins, muffin tops, cakes, cupcakes, drop biscuits, scones, pancakes, cinnamon buns, donuts, waffles, brownies, and other bakery products made from batters. The batter can be pumped, extruded, or molded and subsequently sliced, scored, wire cut, stamped, or rolled into many different formats due to the fact that it retains its shape at refrigerated temperatures. Examples of such formats are: individual pieces of any shape (round pucks, hexagon pucks, cubes, etc.) cylinder shaped logs that can be sliced into individual pieces scored or unscored rectangular blocks that can be broken or cut into individual pieces flat sheets The refrigerated pieces can be placed directly onto a baking pan, muffin pan, aluminum muffin cup, cake pan, etc. and immediately baked in the oven to yield a product with a high specific volume. The batters of this application can be made to be stable for more than 75 days at refrigeration temperatures using conventional unmodified atmospheric packaging such as plastic films or plastic pails. Preferably, the packaging material have good moisture and oxygen barrier properties. The invention batter can also be stored frozen.

The present invention relates to a reagent refrigerator which comprises a reagent refrigerator compartment including reagent storing trays; an upper housing a cooling equipment compartment and a cooling purification compartment; a side duct defined by a side partition having a through hole at the side of the reagent refrigerator; one each of a second side duct, separately defined by a side partition having a through hole at the other side thereof, and a rear duct, separately defined by a rear partition having a through hole at the rear side thereof; and an upper duct having one end communication with the upper portion of the second side or rear side, and the other end communicating with the cooling purification compartment. Accordingly, refrigeration temperature of the reagent refrigerator can be controlled, and circulation flow in the reagent refrigerator is improved, to thereby purify the air therein and minimize deviations from refrigerator temperature values. In addition, since the reagent refrigerator is based on a closed circulation type structure, impurities are prevented from being introduced to the reagent refrigerator to thereby increase the service life of the filter and reduce energy consumption. Moreover, even when the door of the reagent refrigerator is opened, negative pressure distribution in the reagent refrigerator is relatively even, thereby preventing the emission of noxious gas and an offensive smell from the reagent refrigerator compartment to the indoor space. More particularly, the reagent refrigerator may be modified to have a partial opening circulation structure without a heater to thereby prevent explosions and to perform a defrosting / dehumidifying operation so that safety and economic feasibility can be improved. In addition, the reagent refrigerator can be automatically controlled and the internal condition of the reagent refrigerator compartment can be monitored in real time. Furthermore, not only can on-site / real-time control be executed, but remote control as well.

Easier handling during packing and reduced pouch spotting is seen when a moist smokeless tobacco product is at a sub-refrigeration temperature during formation and sealing of portioned product.

The invention discloses a high efficient low temperature absorption refrigerating machine, which is a signal grade ammonia absorption refrigeration machine with low refrigeration temperature by utilizing strong solution to recover rectify heat, absorption heat and calorific potential. A medium and low temperature generator is arranged between a high temperature generator and a dephlegmator, which is able to recover the generating heat by utilizing a first solution heat exchanger and a second solution heat exchanger; a medium temperature absorber is positioned between a solution throttle valve and the low temperature generator, which recovers the rectify heat by utilizing the heat exchanger in the dephlegmator and recovers the absorption heat by utilizing the heat exchanger arranged in the medium temperature absorber as well as stores the potential by utilizing an ammonia liquid storage tank and a solution storage tank. By applying simple and reliable calorific potential system, the invention is able to effectively utilize the regenerative energy and the valley electricity and to achieve the refrigeration temperature as 30 DEG C. under zero, and has the advantages of high efficiency, saving energy and steady performance, etc.; therefore, the invention is particularly suitable for occasions needing low refrigeration temperature for freezing or chilling food.

The invention relates to a method and an apparatus for testing the ice adhesion strength. The apparatus comprises parts of a sample mount, refrigeration units, a water titration unit, a sliding knife, a force sensor and the like. The method for testing the ice adhesion strength comprises the following steps: fixing a test piece to be tested on the sample mount, and refrigerating the test piece to be tested by the bottom refrigeration unit; titrating quantitative water to the surface of the test piece to be tested by a water titration device to allow water to rapidly freeze on the surface of the test piece to be tested when the temperature of the test piece to be tested achieves a preset refrigeration temperature; and parallelly trimming convex ice hulls on the surface of the test piece by the sliding knife with the force sensor, testing maximal force when ice is peeled (or ruptured), and treating the maximal force as the ice adhesion strength for characterizing the surface of a material or a coating. According to the method and the apparatus provided by the invention, the principle and the structure are simple, the operation is simple and convenient, and the tangential adhesion strength between the surface of the material (or the coating) and ice can be actually characterized; and the repetition reliability and the accuracy of tests can be guaranteed because main parameters of the freezing rule, the pattern, the experimental temperature and the like are accurately controlled.

The invention discloses an auto-cascade injection low-temperature refrigeration circulating device, which comprises a generator, an air injector, a working medium pump, a condenser, a liquid-vapor separator, an evaporator unit and a condensing injector. An inlet of the condenser is connected with an outlet of the condensing injector. The outlet of the condensing injector is connected with an inlet of the liquid-vapor separator. The liquid-vapor separator is provided with two liquid outlets, wherein one outlet is connected to an inlet of the working medium pump. An outlet of the working medium pump is divided into two paths, wherein one path is connected to an inlet of the condensing injector, while the other path is connected to an inlet of the generator. An outlet of the generator is connected with an inlet of the air injector. An outlet of the air injector is connected with an injection inlet of the condensing injector. The other liquid outlet of the liquid-vapor separator is connected with an inlet of the evaporator unit. A reflux opening of the evaporator unit is connected with an injection inlet of the air injector. An air outlet of the liquid-vapor separator is connected with another inlet of the evaporator unit. The auto-cascade injection low-temperature refrigeration circulating device increases the working pressure of the condenser through the condensing injector and can realize the low-temperature deep refrigeration temperature of less than 30 DEG C below zero.

The invention relates to a non-combustible mixing refrigerant suitable for deep refrigeration temperature of minus 80 DEG C to minus 100 DEG C. The non-combustible mixing refrigerant comprises five groups of materials, where the first group of material is tetrafluoromethane; the second group of material is trifluoromethane, hexafluoroethane or a mixture of the trifluoromethane and the hexafluoroethane; the third group of material is pentafluoroethane, trifluoroethane, perfluoropropane, difluoromethane or a mixture of two, three or multiple of the pentafluoroethane, the trifluoroethane, the perfluoropropane and the difluoromethane; the fourth group of material is iodotrifluoromethane, 1, 1, 2, 2-tetrafluoroethane, 1,1-difluoroethane, 2, 3, 3, 3-tetrafluoropropene, 1, 3, 3, 3-tetrafluoropropene or a mixture of two, three or multiple of the iodotrifluoromethane, the 1, 1, 2, 2-tetrafluoroethane, the 1,1-difluoroethane, the 2, 3, 3, 3-tetrafluoropropene and the 1, 3, 3, 3-tetrafluoropropene; the fifth group of material is perfluoro-n-butane, 1, 1, 1, 3, 3-perfluoropropane or a mixture of the perfluoro-n-butane and the 1, 1, 1, 3, 3-perfluoropropane; the molar concentrations of the five groups of materials are respectively 25-50%, 15-40%, 10-30%, 5-20% and 10-25%; and the non-combustible mixing refrigerant is safe in a back-heating type throttling refrigeration system, can realize the refrigeration in the temperature range of minus 80 DEG C to minus 100 DEG C and has low whole green house effect without ozone depletion effect.

A technique for quick-frozen gingers includes the processes of ginger selection, desulfurization, sterilization and quick-freezing. The process of ginger selection includes three steps, i.e. material selection, material trimming and winnowing; the process of desulfurization includes three steps, i.e. soaking for desulfurization, cleaning in clean water and sorting; the process of sterilization includes three steps, i.e. sterilization in medical solution, blanching for sterilization and cleaning in normal-temperature water; the process of quick-freezing includes three steps, i.e. cooling in ice water, quick-freezing and making of ice rinds; the gingers are quick-frozen under less than 25 DEG C below and within 15 minutes; in the steps of cooling in ice water and quick-freezing, water temperature is chosen according to the temperature of the quick-freezing tunnel of a fluidized quick-freezing machine, an ice water pond needs to be refrigerated if the temperature of the quick-freezing tunnel is higher than 30 DEG C below, the refrigeration temperature is controlled at 0 DEG C to 5 DEG C, and if the temperature of the quick-freezing tunnel is lower than 30 DEG C below, the ice water pond uses normal-temperature water; in the step of making of ice rinds, the gingers discharged out of the discharge outlet of the quick-freezing tunnel are directly put into a container containing ice water with temperature lower than 4 DEG C for 1 to 3 seconds; and after being packaged, the gingers are stored under the low-temperature condition of less than 18 DEG C below and transported to a point of consumption.

Disclosed are an axial-flow type self-pressurization gas wave refrigerating device and a refrigerating method thereof. By means of the refrigerating device and the refrigerating method thereof, gas wave expansion refrigeration can be performed, simultaneously, energy of high pressure gas waves can be directly utilized to boost pressure of refrigerated gases, low-temperature medium-pressure refrigerated gases can be obtained through cooling capacity exchange, and usable qualities of the refrigerated gases are greatly improved. According to the refrigerating device and the refrigerating method thereof, compression capacity accompanied by gas wave expansion refrigeration is developed to convert high pressure gas energy into precious pressure energy, consumed energy is not increased, heat exchange during expansion and compression can be reduced, and the refrigeration temperature is low. Besides, pressure energy of high pressure gases is fully used and converted, and the refrigerating device and the refrigerating method thereof are suitable for technical fields of refrigeration, dehydration and purification, condensation of heavy components in gases by natural gas pressure energy of a high pressure gas well, pressure energy utilization and low-temperature copious cooling of industrial waste gases and the like.

Provided are a method and refrigeration appliance for making substantially-transparent ice. The refrigeration appliance includes a fresh food compartment in which a refrigeration temperature that is greater than 32° F. and less than 55° F. is maintained, and a water tray disposed within the fresh food compartment and including a bottom surface and an upwardly extending wall forming a reservoir for holding a volume of water. A plurality of fingers are supported adjacent to the water tray to be at least partially submerged in water within the water tray, and an evaporator is in thermal communication with the fingers for chilling an exposed surface of the fingers to a finger temperature that is less than 32° F. Water is introduced into the water tray, and an extent to which the fingers are submerged in the water is repeatedly adjusted.

The invention provides an air cooling heat dissipation thermoelectric cooler (TEC) electric refrigeration charge coupled device (CCD) Dewar which comprises a vacuum Dewar (1), a CCD detector (3), a TEC, an air cooling heat dissipation system (7) and a molecular sieve (5), wherein the CCD detector (3), the TEC and the molecular sieve (5) are arranged inside the vacuum Dewar (1), a cold end of the TEC is in heat conductance with the CCD detector (3), a hot end of the TEC is in heat conductance with the air cooling heat dissipation system (7), and the air cooling heat dissipation system (7) is connected with a vacuum Dewar cavity body (1) in a sealed mode. Due to the fact that the TEC and the molecular sieve are used for maintaining the technologies such as vacuum and air cooling heat dissipation in a long term to ensure low temperature requirements of a CCD in operation of the system, the air cooling heat dissipation TEC electric refrigeration CCD Dewar has the advantages of being large in a heat sink heat dissipation surface area, fast in temperature cooling speed, low in absolute refrigeration temperature, long in vacuum maintaining time, small in size, less in quality, convenient to install and control, capable of observing at any angle, simple in operation and maintenance and capable of being directly used for imaging and photometry of a astronomical telescope CCD lens.

The invention discloses a method and a device for recovering light hydrocarbons through refrigeration using a compound refrigerant and secondary dealkylation, wherein the advantages of the traditional natural gas-dealkylation direct heat exchange process are combined with the method of the invention; the precooling of the raw material natural gas, the condensation of a deethanizer top gas, and the cold quantity recovery of the product natural gas and the liquid-phase material of a low-temperature separator are all realized in a main heat exchanger; the cold quantity source of the dealkylation process is provided by a compound refrigerant refrigerating system. The composition, the component contents, the flow rate and the evaporation pressure of the compound refrigerant are adjusted and matched cold quantity and different refrigeration temperatures are provided for the light hydrocarbon condensation process, so that the flexibility of the method in operation and good adaptability of the method to the amount, the pressure and the composition change of the raw material gas; and the method has the characteristics of low energy consumption, high C3 yield and good adaptability to the change of working conditions.

The invention relates to a novel energy-saving refrigeration temperature-controlling box. The box comprises a semiconductor refrigeration system, a 12V-power supply system, a metal shell, a box body fan and a temperature-keeping box body, wherein the temperature-keeping box body comprises low-heat conductivity ceramic fiber paper, a double-layer high-density polythene thin plate, an extrusion molding polystyrene temperature-keeping plate and a double-layer aluminum alloy or stainless steel plate material from outside to inside; thin-walled copper pipes are arranged in the middle of the double-layer aluminum alloy or stainless steel plate material at intervals; a nano composite phase-change material is contained in the thin-walled copper pipes; the metal shell is arranged on the outer side of the low-heat conductivity ceramic fiber paper; the 12V-power supply system powers the semiconductor refrigeration system; the refrigeration end of the semiconductor refrigeration system is connected in the temperature-keeping box body; and the box body fan is connected to a cold end radiating fin. The novel energy-saving refrigeration temperature-controlling box can be used for food-refrigerating and freshness-keeping functions under the condition of enough domestic power, can also effectively work under the condition of interruption of power supply, and is suitable for long-distance medium and low-temperature storage of foods, vegetables, medicines and the like, and due to the adoption of the nano composite phase-change material, the aim of saving energy of the temperature-keeping box is fulfilled.

A range of products and methods are based on a creamy base of cream, artificial cream, thickened cream, cream cheese, mixtures thereof and mixtures with compatible incidental ingredients, the creamy base being aerated while cold and intimately mixed with a hot aqueous gelatin solution typically around 80° C. and providing 1-3% gelatin in the mixed product and the overrun in the aeration being typically in the range of 10-40%. Various further components are included or introduced with further processing selected from methods including heating the product with a further component to boiling point whereby de-aeration and enhanced shelf life is found in the resultant product. An alternative method is where flavor components are added prior to de-aeration. Another application is as a carrier for a pharmaceutical agent which is incorporated into the creamy base and protected with the gelatin matrix, a powder being formed ready for packaging in pharmaceutical doses. Another embodiment which does not require heating is incorporating a flavoring agent and food acid to obtain a pH of 3.0 to 4.2 an adding a large volume of water which has the effect of ensuring a low viscosity and the elimination of aeration whereby a pourable sauce-like product can be achieved at refrigeration temperatures.

A refrigerated storage temperature fluctuation accurate controlling method of indirect cool refrigerator includes: a temperature transducer is arranged in the cold storage room; the temperature of the cold storage room is detected and transmitted to a circuit board and a control program for controlling damper and refrigerator operation and the control program accurately controls the opening size of the damper; when the temperature transducer detects that the cold storage room needs cooling, the damper controlled by a controllable damper motor is opened to the largest extent; as the temperature gradually decreases, the opening size of the damper also gradually decreases; when the temperature of the cold storage room reaches the break point, the damper is closed. The ventilation circuit is from the air inlet of the electronic damper and the cold air flows in a thermal insulation layer, then blows to the interlayers of the cold storage room from the air outlets and finally returns to the freezing room through an air return outlet. The invention can accurately control the temperature of the cold storage room, avoiding the high fluctuation of local temperature of the refrigerator caused by large air supply in cooling, and improving the refrigerator quality.

The invention provides a fixed-frequency air conditioner control method and device and an air conditioner, and the method comprises the steps of obtaining a target set temperature and a real-time indoor environment temperature after the air conditioner is powered on; judging whether the difference temperature is greater than a first threshold value or not; if yes, starting a compressor and an outer draught fan, and controlling an inner draught fan to operate at a high wind gear; recording the running time of the compressor, and judging the difference temperature; when the difference value temperature is larger than or equal to a third threshold value and is smaller than or equal to a second threshold value, switching the inner draught fan into a low air gear; and after the difference temperature is smaller than the third threshold value and the running time is longer than first preset time, controlling the compressor and the outer fan to be stopped. Thus, the fluctuation range of the indoor environment temperature can be limited below a refrigeration temperature threshold value, the large temperature fluctuation is prevented, and the user experience is improved.

The invention relates to a control method of a variable-frequency refrigerator. The control method is particularly suitable for refrigerating plants like refrigerators which are relatively high in energy-saving requirement and easy to control. The refrigerator comprises a mechanical temperature controller, a variable-frequency control panel and a compressor, wherein the mechanical temperature controller is responsible for setting a refrigeration temperature in the refrigerator and outputting a corresponding switch signal according to an actual temperature in the refrigerator and the refrigeration temperature; the variable-frequency control panel is responsible for collecting the switch signal of the mechanical temperature controller, and analyzing and processing the switch signal to intelligently analyze the turn on / off time of the compressor, thereby controlling the running speed of the compressor. The control method of the variable-frequency refrigerator is simple in structure and convenient to operate, and particularly applicable to refrigeration control of the refrigerator. The variable-frequency control panel of the variable-frequency refrigerator can intelligently record the turn on / off ratio of the compressor, so that the running speed of the compressor is controlled and energy is saved.

A novel electric refrigerator, comprises: an air cooling system, as well as a super-cooling fresh-keeping chamber connected with the air cooling system through an induced duct and a backwind tube, and further comprises a cooling chamber and a refrigeration chamber; wherein the super-cooling fresh-keeping chamber is arranged under the cooling chamber and on the refrigeration chamber and comprises an internal chamber and external chamber with certain space therebetween. The control method of the novel electric refrigerator comprises: sensing the temperature of the super-cooling fresh-keeping chamber by a temperature sensor; sending out an instruction by a microcontroller according to the temperature to control the operation of a driving circuit; and controlling a fan to work by the driving circuit to introduce cold airflow until the super-cooling fresh-keeping chamber is maintained in a super-cooling state. The invention is characterized in that foods are kept fresh in a normal refrigeration temperature without freezing.

The scheme discloses a breeding method of rhizoma polygonati seeds, belonging to the technical field of breeding of rhizoma polygonati. The breeding method comprises the following steps: A, drying the rhizoma polygonati seeds until the water content is 8 to 10 percent, and refrigerating at the temperature of 1 to 3DEG C; B, 20 to 25 days before the seeds are sown, adjusting the refrigeration temperature of the seeds to 15 to 20DEG C and covering the seeds with 4 to 5 layers of gauze which is soaked into water and wet through; C, 2 to 3 days before the rhizoma polygonati seeds are sown, taking out the rhizoma polygonati seeds and soaking the rhizoma polygonati seeds with warm water with the temperature of 30 to 35DEG C for 35 to 40 hours; D, soaking the rhizoma polygonati seeds with a mixed solution consisting of brassinolide and gibberellin for 6 to 8 hours; E, sowing the rhizoma polygonati seeds on a substrate with the thickness of 3 to 5cm, and then spreading the substrate with the thickness of 2 to 3cm on the rhizoma polygonati seeds, and then watering through the substrate on the upper and lower layers of the rhizoma polygonati seeds with clear water, wherein the substrate is formed by uniformly mixing vermiculite, river sand and distillers' grains; F, after the rhizoma polygonati seeds are sown, keeping the moisture of the substrate at 35 to 40 percent, performing fertilizing and deinsectization in time. The rhizoma polygonati seeds are bred by adopting the method in the scheme, so the germination rate of the rhizoma polygonati seeds can be significantly improved.

The invention relates to a refrigerator defrosting control method and system. The method comprises the steps that a refrigerator is controlled to run; whether a defrosting starting condition is met or not is judged, the refrigerator is kept running at the original state if the defrosting starting condition is not met, and whether a compressor runs or not is judged if the defrosting starting condition is met; if the compressor runs, refrigeration temperature is obtained in real time, whether the refrigeration temperature is smaller than or equal to Tft-a DEG C or not is judged, Tft is a refrigeration shutdown point, and a is a constant; if the refrigeration temperature is smaller than or equal to Tft-a DEG C, a fan is controlled to stop running, a defrosting heater is started, and the refrigerator enters in a defrosting mode; if the compressor does not run, the fan is directly controlled to stop running, the defrosting heater is started, and the refrigerator enters in the defrosting mode; whether a defrosting finishing condition is met or not continues to be judged, the defrosting mode is kept if the defrosting finishing condition is not met, and the defrosting mode quits if the defrosting finishing condition is met. The influence of rise of the refrigeration temperature on the refrigeration effect in the defrosting process is effectively reduced, it is guaranteed that food in a freezing chamber is below target temperature, and refrigeration quality is guaranteed.