23 results about "Freezing Point Temperature" patented technology

The invention discloses a low-temperature plasma cold sterilization and fresh-keeping method for a chilled poultry meat product, and particularly relates to a low-temperature plasma cold sterilization and fresh-keeping method for the chilled poultry meat product by virtue of low-temperature plasma activated water (PAW) and dielectric barrier (DBD). The method comprises the following steps: spraying and sterilizing the whole slaughtered and eviscerated poultry meat by virtue of PAW with the temperature close to the freezing point temperature of-1.5 to-2.5 DEG C of the product; the fresh-keeping method comprises the following steps: soaking the fresh-keeping materials in PAW at the temperature of less than or equal to-1.50 DEG C, cooling to the temperature of-1.5 + / -0.5 DEG C, cutting and packaging, carrying out DBD low-temperature plasma cold sterilization under the working voltage of 120-160 kV, and carrying out cold-chain logistics under the condition of the fresh-keeping temperature of-1.0 to-1.5 DEG C, so that the fresh-keeping period is prolonged from 4 days to 15 days. According to the method, PAW and DBD plasma cold sterilization and preservation are adopted at the temperature of the chilled products, the shelf life of the poultry meat chilled products is effectively prolonged on the premise of ensuring the freshness, safety and high quality of the poultry meat chilled products, and industrial innovation and sustainable development are promoted.

The invention relates to an equipment defrosting method and device, air conditioning equipment and a storage medium. The method comprises the steps that multiple environment parameter values of the environment where target equipment is located and the surface temperature value of the target equipment are collected; determining a freezing point temperature value corresponding to the current environment according to the plurality of environment parameter values; and under the condition that it is determined that the target equipment meets a preset defrosting condition based on the surface temperature value and the freezing point temperature value, defrosting operation is conducted on the target equipment. Therefore, whether the equipment meets the frosting condition or not can be efficiently and accurately judged, and the defrosting efficiency of the equipment is improved.

The application provides a vehicle air intake cooling control method, system and storage medium. The vehicle comprises an engine, an intercooler, a first pipeline, a second pipeline and a first control valve. The method comprises the following steps: acquiring an ambient temperature of the vehicle, a treatment temperature of gas after passing through the intercooler and a dew point temperature; if the ambient temperature is less than or equal to a freezing point temperature threshold, the treatment temperature is less than or equal to the freezing point temperature threshold and the treatment temperature is less than or equal to a condensation threshold, and the condensation threshold is greater than or equal to the dew point temperature, then the first control valve is controlled to close the first pipeline and open the second pipeline, so that the gas directly enters the engine from the second pipeline without passing through the condenser to reduce the gas temperature, the gas temperature entering the engine is improved, the condensation risk of the gas is reduced, the probability of water accumulation or icing near the outlet of the intercooler is reduced, the probability of throttle sticking is reduced, and the driving safety of the vehicle is improved.

The utility model discloses a refrigerant dewatering and drying device which comprises a tunnel type instant freezer and a separation box, and the separation box is installed on one side of the tunnel type instant freezer. The utility model has the beneficial effects that the tunnel type instant freezer and the separation mesh belt are adopted, a refrigerant flows in the liquid conveying pipe, when the refrigerant passes through the tunnel type instant freezer, the low temperature in the tunnel type instant freezer enables moisture in the refrigerant to be frozen to form ice crystals, the freezing point temperature of the refrigerant is far lower than the freezing point temperature of water, and the refrigerant is still in a liquid state; and when the ice crystals and the refrigerant flow out of the liquid conveying pipe, the ice crystals and the refrigerant flow into the top surface of the separation mesh belt, the ice crystals stay on the top surface of the separation mesh belt, the refrigerant flows into the bottom of the separation box on the left side of the partition plate and is discharged along the liquid discharging pipe, and water removal and drying are completed. The problem that the enterprise cost is increased due to the adoption of consumables such as a drying agent is solved, and the working efficiency and the economical efficiency are remarkably improved.

The invention provides an airport pavement freezing point temperature real-time monitoring method, device and system, and relates to the technical field of airport pavement monitoring. The method comprises the following steps: identifying a ponding area included in each acquisition area in an airport pavement image, and determining a ponding distribution main axis of the ponding area, each acquisition area including a water film sensor; determining the ponding position influence degree based on the ponding total area change trend of the collection area and the distance between each ponding area and the ponding distribution main axis, and determining the ponding area sensitivity by combining the area ratio of each ponding area to the collection area; determining the water film thickness sensitivity of the water film sensor based on the ponding area sensitivity, the pavement water film thickness, the average value and the change rate, and determining the water film thickness sensitivity consistency by combining the average water film thickness sensitivity; and determining the parameter sensitivity of the water film sensor, determining the data accuracy by combining the average parameter sensitivity, correcting the pavement water film thickness, and determining the freezing point temperature. The freezing point temperature monitoring accuracy can be improved.

This invention discloses a control method and apparatus for a refrigeration system. The control method includes: acquiring the freezing point temperature of the refrigerant in the refrigeration system; determining the relationship between the freezing point temperature and a preset temperature value; and controlling the operating states of a solenoid valve and an evaporation pressure regulating valve in the refrigeration system based on this relationship. The control method and apparatus for the refrigeration system provided by this invention can ensure the reliability of the refrigeration system's operation.

The invention discloses a method for testing the supercooling degree of nano-liter liquid drops by a differential scanning calorimetry. The method comprises the following steps: taking a liquid sample with the mass of more than 0.2 mg or the volume of more than 0.2 mu L, then placing the liquid sample in a crucible to form a plurality of sub-droplets, then carrying out DSC test to obtain the phase change enthalpy of the plurality of sub-droplets, and calculating to obtain the degree of supercooling of the plurality of sub-droplets; wherein the volume of at least one sub-droplet is less than 0.1 mu L. The method provided by the invention can accurately measure the freezing point temperature of the liquid drop below 50 nanoliters and even 5 nanoliters, widens the measurement range of the quantitative relationship between the liquid drop size and the supercooling behavior, and lays a technical foundation for researching the liquid coating dominated liquid drop phase change behavior.

The application provides a control method of an air conditioning system and an air conditioner, wherein the control method of the air conditioning system comprises the following steps: the air conditioning system operates in a heating mode; when a first outdoor heat exchanger reaches a defrosting condition, the opening degree of a first electronic expansion valve is controlled so that the outer surface temperature of the first outdoor heat exchanger is above the freezing point temperature, and the opening degree of a second electronic expansion valve is controlled so that the second outdoor heat exchanger keeps normal heating; or when the second outdoor heat exchanger reaches the defrosting condition, the opening degree of the second electronic expansion valve is controlled so that the outer surface temperature of the second outdoor heat exchanger is above the freezing point temperature, and the opening degree of the first electronic expansion valve is controlled so that the first outdoor heat exchanger keeps normal heating. According to the application, during the whole defrosting process, one outdoor heat exchanger is always in normal heating, and the other outdoor heat exchanger is defrosted in the case of participating in the heating of the air conditioning system, so the indoor environment temperature basically does not fluctuate, and therefore the comfort of people is not affected.

The utility model discloses a nitrochlorobenzene freezing point detection device which comprises a base, and a test device, a power supply and control module and a freezing module are arranged on the base. A refrigerator is arranged in the freezing module and is used for providing cooling capacity for the test device; the power supply and control module comprises a power supply and a controller; the power supply is used for supplying power to the freezing module and the test device; the test device comprises a fixed table, a lifting driving device, a lifting table, a test container and a bath. The test container comprises a test bottle, a stirrer, a temperature sensor, a torque sensor, a test bottle cap and a dropwise adding meter. The controller judges whether the test sample reaches a freezing point or not according to the torque value of the stirring shaft, when the test sample reaches the freezing point, the controller stores the measured temperature of the temperature sensor, and the temperature is the freezing point temperature of the test sample. The nitrochlorobenzene freezing point detection device can replace manual work to automatically detect the nitrochlorobenzene freezing point, and is high in detection efficiency, high in detection precision and good in repeatability.

The present invention discloses a method for electrolytic grinding of honeycomb materials based on the freezing point temperature difference characteristics of a medium. The method is as follows: fill the cell grids of the honeycomb material to be processed with a liquid medium, then place the honeycomb material to be processed in an environment with a temperature not higher than the freezing point of the liquid medium, and perform electrolytic grinding after the liquid medium filled in the honeycomb material has solidified; wherein, the freezing point temperature of the electrolyte is lower than the freezing point temperature of the liquid medium. The method of the present invention realizes the mechanical and electrochemical protection of the cell structure by filling the pores of the honeycomb material with a high freezing point medium and solidifying it, so that the cell will not be deformed or damaged due to a large grinding force, nor will over-corrosion occur in the cell due to stray current.

The application provides a printed circuit board type heat exchanger, and belongs to the technical field of heat exchangers, and specifically comprises a heat exchange plate, a cold fluid channel, a hot fluid channel and a heating assembly, wherein the heating assembly is used for directly or indirectly heating the hot fluid medium of the fluid channel when the temperature of the hot fluid medium in the hot fluid channel is lower than a preset temperature. Through the processing scheme, when the temperature of the heat exchanger plate approaches the freezing point temperature of molten salt or liquid metal and its alloy, the heating mode is quickly started, the temperature of the heat exchange plate is raised, and the heat exchange channel is prevented from being blocked.

According to the device and method for preventing the water conveying pipeline from freezing, a mounting frame is arranged in the water conveying pipeline, a driving motor coaxial with the water conveying pipeline is mounted on the mounting frame, a paddle assembly is arranged on the driving motor, and when the interior of the water conveying pipeline may be frozen due to the air temperature, the driving motor drives the paddle assembly to rotate; therefore, water spirally flows in the water conveying pipeline, water at different temperatures is mixed, and freezing caused by continuous reduction of the temperature of water close to the wall surface of the water conveying pipeline is prevented. After the water flow is stable, water which is influenced by centrifugal force, has higher density and is above the freezing point temperature is in contact with the wall surface of the water conveying pipeline, exchanges heat with the outside of the water conveying pipeline, and returns to the center of the water conveying pipeline after the temperature is reduced. Moreover, the water spirally flows in the water conveying pipeline, so that the water flow speed can be increased, the growth of ice crystals is inhibited, more friction heat can be generated, the water temperature is increased to a certain extent, and the purpose of preventing the water conveying pipeline from being frozen is achieved.

The invention discloses an ice food making time determination method, an ice food machine and a storage medium, and relates to the technical field of refrigeration systems, the disclosed ice food making time determination method comprises the following steps: determining a target freezing point temperature of an ice food raw material according to a target component content in the ice food raw material; based on the relationship between the raw material temperature and the making time, predicting first making time when the ice food raw material is changed from the initial temperature to the target freezing point temperature and second making time when the ice food raw material is changed from the target freezing point temperature to the set temperature, and obtaining ice food making completion time; according to the ice food making completion time, determining the remaining ice food making time; and displaying the remaining ice food making time. According to the technical scheme, the ice food making completion time is accurately predicted, so that the feedback precision of the remaining ice food making time is improved.

The utility model relates to a snow making system technical field especially is concerned about a kind of snow making machine terminal auxiliary device and snow making system.The snow making machine terminal auxiliary device includes double fluid nuclear, condenses snow subassembly and refrigeration subassembly.Wherein, double fluid nuclear has high pressure water and high pressure air in flow circulation.Condenses snow subassembly including shell and condenses snow screen, condenses snow screen is set on the inner wall of shell, shell has mutually communicating import and export, import is communicated with double fluid nuclear, export is configured as the snow crystal group that sprays out.Refrigeration subassembly is communicated with shell, or, refrigeration subassembly is attached on the outer wall of shell.Refrigeration subassembly provides low temperature environment for condenses snow subassembly, the temperature of this low temperature environment is lower than freezing point temperature, so that water mist can evaporate condensation crystallization rapidly, and through condenses snow screen on shell inner wall, adhere to gather, form the snow crystal group of cluster or flocculate and finally be sprayed out from condenses snow subassembly, to improve snow quality, improve the snow making snow rate, save cost.

The present application relates to a kind of photonic crystal indicating label for cryogenic monitoring, belong to indicating material field.It is characterized in that with photonic crystal as temperature response material, after being uniformly mixed with phase transition temperature adjustable solvent, directional freezing is carried out at the freezing point temperature of solvent, the principle that ice crystal formation and melting caused by temperature fluctuation change photonic crystal arrangement and cause label discoloration is used, temperature monitoring of low-temperature storage product is realized.The indicating label produced by the present application has the advantages of simple preparation method, wide monitoring temperature range, high sensitivity, etc., as indicating label to monitor the temperature fluctuation of cold chain logistics product.

The present application provides a crude oil electromagnetic field comprehensive modification method. The method comprises the following steps: heating crude oil to a first predetermined temperature above its wax precipitation point temperature and constant temperature for a first time; then cooling to a second predetermined temperature and constant temperature for a second time; then performing magnetic field treatment at the second predetermined temperature; then constant temperature at a third predetermined temperature between the wax precipitation point temperature and the freezing point temperature of the crude oil for a third time; then performing electric field treatment at the third predetermined temperature to obtain modified crude oil. The method of the present application is not a simple combination of magnetic field and electric field, but uses the effect of magnetic field on key components in crude oil to enhance the electric field viscosity reduction effect of crude oil and improve the flowability of crude oil.

The application discloses a temperature regulation method, a temperature regulation device and refrigeration and preservation equipment thereof. The freezing point temperature of food is determined during the cooling process of the food. When the temperature of the food is stable within a preset time period during the cooling process, the upper limit of the refrigeration temperature is determined according to the stable temperature value within the preset time period. The upper limit of the refrigeration temperature represents the freezing point temperature of the food. Then, the lower limit of the refrigeration temperature is determined according to the upper limit of the refrigeration temperature. The ice-water ratio of the food is kept stable within the range of the upper limit of the refrigeration temperature and the lower limit of the refrigeration temperature, that is, the temperature of the food is kept in the interval where the ice-water ratio is stable. Then, the refrigeration and preservation equipment regulates the temperature of the preservation space according to the upper limit of the refrigeration temperature and the lower limit of the refrigeration temperature. The ice coat is formed on the surface of the food, the invasion of microorganisms into the food is prevented, the ice-water ratio in the food is kept, and the repeated freezing and thawing of ice crystals in the food is avoided. Therefore, the preservation and nutrition effect of the food is ensured, and good micro-freezing preservation effect is realized.

The invention discloses a sample freezing point temperature detection device and method.The air outlet end of an air pump communicates with a cold and hot air flow separation device through an electronic pressure regulating valve, the electronic pressure regulating valve is electrically connected with the first control end of a controller, the second control end of the controller is electrically connected with a temperature sensor, and the temperature sensor is arranged at the cold end of a refrigeration device; and the cold and hot air flow separation device is communicated with the refrigeration device. Compressed air is conveyed into the vortex tube through the air pump, and after a vortex chamber in the vortex tube is expanded and accelerated, airflow is divided into a cold stream and a hot stream. The hot air flow is released to the external environment, and the cold air flow enters the hot end of the Peltier refrigerator. The Peltier refrigerator is powered on for refrigeration, and the hot end absorbs heat from the ultralow-temperature cold air flow, so that the cold end of the Peltier is kept in an ultralow-temperature state. After the sample is placed on the vortex tube, the current direction of the Peltier can be adjusted to switch to a heating mode, meanwhile, airflow of the vortex tube is reduced or stopped, and the freezing point temperature of the sample is observed in the temperature rising process.

The invention belongs to the technical field of construction dust fall, and particularly discloses a highway engineering construction site dust fall device which comprises a protection plate, a water supply main pipe horizontally fixed to one side of the protection plate and water supply branch pipes communicated to the upper side of the water supply main pipe in an array mode. The upper end of the water supply branch pipe extends out of the heat preservation sleeve and is not wrapped, a spray head is installed at the top end of the water supply branch pipe, and a liquid supply bent pipe, a phase change driving assembly, a liquid control system and a liquid supply assembly are further included. The anti-freezing solution is automatically injected and filled into the spray head by using the driving force generated by phase change of the temperature-sensitive phase change material when the temperature is close to the freezing point temperature of water, and the spray head is automatically reset and new anti-freezing solution is stored after the temperature rises, so that full-automatic and circulating anti-freezing protection of the spray head is realized, electric energy consumption and manual intervention are not needed, and the working efficiency is improved. And the problems of ice blockage and frost heaving damage of the spray head are solved, so that the operation cost is effectively reduced.

According to the device for preventing the water conveying pipeline from freezing, the mounting frame is arranged in the water conveying pipeline, the driving motor coaxial with the water conveying pipeline is mounted on the mounting frame, and the paddle assembly is arranged on the driving motor, so that when the interior of the water conveying pipeline is possibly frozen due to the air temperature, the driving motor drives the paddle assembly to rotate; therefore, water spirally flows in the water conveying pipeline, water at different temperatures is mixed, and freezing caused by continuous reduction of the temperature of water close to the wall surface of the water conveying pipeline is prevented. After the water flow is stable, the water which is influenced by centrifugal force, has higher density and is above the freezing point temperature is in contact with the wall surface of the water conveying pipeline, exchanges heat with the outside of the water conveying pipeline, and returns to the center of the water conveying pipeline after the temperature is reduced. Moreover, the water spirally flows in the water conveying pipeline, so that the water flow speed can be increased, the growth of ice crystals is inhibited, more friction heat can be generated, the water temperature is increased to a certain extent, and the purpose of preventing the water conveying pipeline from being frozen is achieved.

The invention relates to the technical field of air conditioners, particularly provides a control method for an air conditioner, and aims to solve the problem of how to effectively delay frosting of an outdoor heat exchanger while reducing energy consumption. In order to achieve the purpose, according to the control method for the air conditioner, the dew-point temperature and the freezing-point temperature are determined through the outdoor environment temperature and the outdoor environment humidity, and then the spraying mechanism is controlled to spray the solution to the outdoor heat exchanger based on the surface temperature of the outdoor heat exchanger, the dew-point temperature and the freezing-point temperature. As the freezing point of the sprayed solution is smaller than that of water, the freezing point temperature of the surface of the outdoor heat exchanger can be reduced, frosting of the outdoor heat exchanger is effectively delayed, the heat exchange efficiency of the outdoor heat exchanger is ensured, and stable operation and the heating effect of the air conditioner are guaranteed. In addition, compared with an existing frosting delaying mode, the frosting time of the outdoor heat exchanger can be effectively delayed, a heating element does not need to be used, and energy consumption is greatly reduced.

The utility model discloses a heat pump type evaporation cold and hot air conditioner, and relates to the technical field of air conditioners. The air conditioner indoor unit comprises an indoor unit main body and an outdoor unit main body, the bottom end of the indoor unit main body is fixedly provided with an adjustable machine base which is used in cooperation with the indoor unit main body, the adjustable machine base is of a symmetrical structure, the lower end of the indoor unit main body is provided with connecting bases which are used in cooperation with the adjustable machine base, and the connecting bases are distributed in a mirror image mode; the working mode of combining water cooling, air cooling and the compressor is matched with circulating water for circulating cooling, so that the energy efficiency ratio can be exerted to the maximum, and then the energy consumption can be reduced; a silicon nitride ceramic chip is additionally arranged at the position where a condensation pipe in the condenser is converted into an evaporator inlet, so that the phenomenon that in winter, when the temperature of secondary evaporation circulating water of the outdoor unit body is higher than the freezing point temperature, a pipeline is frozen, and faults are caused can be avoided, and generated heat is all absorbed by the indoor unit body; therefore, the heating capacity of the heat pump can be improved according to the principle of the heat pump, and the purpose of heating is achieved.

The present invention discloses a collaborative control method for improving the quality of the fresh aquatic product supply chain, which belongs to the field of food preservation technology. The present invention uses electric field and magnetic field to assist mixed antifreeze protein treatment, and electromagnetic field to assist transportation and sales in a complete process. Due to the addition of a constant magnetic field and a pulsed electric field in the pretreatment process, the freezing point temperature of the fresh aquatic product is significantly reduced. The fresh aquatic product does not freeze at a lower temperature, the occurrence of product corruption during processing is reduced, and fewer ice crystals are formed in the subsequent supply chain transportation and sales stages. During the subsequent shelf storage period, the addition of the electromagnetic field causes the freezing point of the sample during the storage process to remain at a low level, resulting in less damage to cells and less nutritional loss. During the supply chain process, the TBA value, TVB-N value, and K value in the supply chain link increase slowly, the freshness of the product remains intact, the growth of microorganisms is slow, and the subsequent thawing link is omitted, thereby extending the shelf life of the fresh aquatic product and extending the sales period to achieve the purpose of increasing revenue.