CN109708773B - Liquid temperature measuring method, processor and system - Google Patents
Liquid temperature measuring method, processor and system Download PDFInfo
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- CN109708773B CN109708773B CN201910026425.2A CN201910026425A CN109708773B CN 109708773 B CN109708773 B CN 109708773B CN 201910026425 A CN201910026425 A CN 201910026425A CN 109708773 B CN109708773 B CN 109708773B
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Abstract
The invention relates to a liquid temperature measuring method, a processor and a system, and belongs to the technical field of temperature measurement. According to the temperature measuring method, the loading capacity is accurately calculated through the pressure fluctuation of saturated steam in the sterilization cavity, the cavity wall temperature fluctuation or the sampling temperature fluctuation of the sample container, so that the comprehensive heat conduction coefficient loaded in the cavity is derived, and finally the average temperature value of liquid loading can be calculated through the obtained two parameters, so that the problem of large errors among the cavity wall temperature, the sample container temperature and the average temperature of liquid in an actual loading container in the current liquid sterilization process is corrected.
Description
Technical Field
The invention belongs to the technical field of temperature measurement, and particularly relates to a liquid temperature measurement method, a processor and a system.
Background
In research works, a steam sterilizer is usually selected to sterilize liquid. The specific sterilization process comprises the steps of placing a plurality of liquid containers in a cavity of a steam sterilizer, and injecting high-temperature steam into a closed cavity to heat the liquid containers; when the temperature of the liquid container reaches a set temperature value, keeping the temperature within a preset time period, then stopping heating, and reducing the pressure and the temperature; when the pressure drops to atmospheric level and the temperature is below the boiling point of the liquid, the chamber door is opened to remove the container.
In the above liquid sterilization process, the temperature probe measures either the temperature of the chamber wall or the temperature of the sample in one of the containers using a moving probe as an estimate of the liquid temperature. Because the specific heat capacity of the water-based liquid is far greater than that of the metal cavity wall, the temperature of the cavity wall and the temperature of the liquid have great temperature difference in the temperature rising process, and when the temperature of the cavity wall reaches the sterilization temperature set value, the liquid can reach the preset temperature by heating for a long time; even if a movable probe is used to measure the temperature of the liquid in one or more containers, the proximity of the sample container in the chamber to the steam inlet, the number of containers, the capacity of different containers, etc., can result in large fluctuations in the rate of temperature rise of the liquid container, and the use of the temperature of a single sample vial to represent the average temperature of all liquid containers in the chamber can result in large deviations in sterilization results. Particularly, the liquid container inserted into the temperature probe cannot be closed, steam can enter the container to directly contact with the liquid level and be condensed and dissolved into liquid, and the temperature rise speed of the sample container can be higher than that of other sealed liquid containers due to the huge energy released by phase change. These temperature sensing methods result in a large error between the temperature measurement of the liquid in the container and the actual temperature.
Disclosure of Invention
The invention provides a liquid temperature measuring method and system, aiming at solving the problem that a large error exists between a liquid temperature measuring result in a container and an actual temperature in the prior art.
The invention provides the following technical scheme:
in one aspect, a method of liquid temperature measurement, the method comprising:
defining target steam sterilization equipment, placing at least one liquid container in a cavity of the target steam sterilization equipment, injecting high-temperature steam into the cavity until the high-temperature steam is saturated, and heating the liquid container;
obtaining the heat dissipation rate in the cavity;
increasing the temperature in the cavity, and acquiring a pressure change value in the cavity and a temperature change value of liquid in the cavity wall or the sample container before and after temperature rise;
calculating the volume of the liquid in the cavity according to the volume of the cavity, the change value of the pressure in the cavity, the change value of the temperature of the cavity wall or the change value of the temperature of the liquid in the sample container based on an energy conservation law;
calculating the overall thermal conductivity of the liquid loaded in the container in the cavity and the container according to the volume of the cavity and the heat loss rate in the cavity based on Newton's cooling law;
calculating the average temperature of the liquid based on the volume of the liquid and the bulk thermal conductivity.
Further optionally, the obtaining the rate of heat loss in the cavity includes:
acquiring the steam mole number of the liquid in the cavity at a first temperature;
acquiring heat released by steam in the temperature reduction cavity according to the steam mole number;
obtaining a phase change enthalpy heat value released by steam condensation in the cavity;
and obtaining the heat loss rate in the sterilization cavity according to the sum of the heat released by the steam in the temperature reduction cavity and the heat value of the phase change enthalpy released by the steam condensation in the cavity.
Further optionally, the obtaining the phase-change enthalpy calorific value released by the condensation of the steam in the cavity includes:
calculating the mole value of the steam in the cavity when the temperature is reduced to the second temperature;
and calculating the phase change enthalpy heat value released by the condensation of the steam in the cavity according to the molar value.
Further optionally, the increasing the temperature in the cavity to obtain a pressure change value in the cavity, a temperature change value of the cavity wall and a temperature change value of liquid in the sample container before and after the temperature rise includes:
and when the temperature of at least one thermal probe in the wall cavity or the cavity reaches a set temperature, stopping heating the cavity and sealing the cavity.
Further optionally, before the temperature rise, the temperature of the liquid in the sample container is detected as the temperature of the liquid container in the central portion in the cavity.
Further optionally, the calculating the overall thermal conductivity of the liquid contained in the container in the cavity to the container comprises: the difference between the energy released by the decrease in temperature of the vapor and the amount of heat dissipated in the cavity is equal to the energy absorbed by the increase in temperature of the liquid over any period of time.
Further optionally, the amount of heat dissipated in the cavity is equal to the product of the rate of heat dissipated in the cavity and the energy released by the decrease in temperature of the steam.
Further optionally, the calculating the average temperature of the liquid comprises: the heat energy conducted in unit time is proportional to the temperature difference between the container and the cavity and the loading capacity.
In yet another aspect, a processor for liquid temperature measurement, the processor comprising: the device comprises an acquisition module, a first calculation module, a second calculation module and a third calculation module;
the acquisition module is used for acquiring the heat loss rate in the cavity of the target steam sterilization equipment and acquiring the pressure change value in the cavity and the temperature change value of liquid in the cavity wall or the sample container before and after the temperature of the target steam sterilization equipment is raised;
the first calculation module is used for calculating the volume of the liquid according to the volume of the cavity, the pressure change value in the cavity, the temperature change value of the cavity wall or the temperature change value of the liquid in the sample container based on an energy conservation law;
the second calculation module is used for calculating the overall thermal conductivity of the liquid loaded in the container in the cavity and the container according to the volume of the cavity and the heat dissipation rate in the cavity based on Newton's cooling law;
the third calculating module is used for calculating the average temperature of the liquid according to the volume of the liquid and the overall thermal conductivity.
In yet another aspect, a liquid temperature measurement system, the system comprising: the processor and at least one steam sterilizer; the steam sterilizer includes: the device comprises a cavity, a heating module or a steam injection module and a detection module;
at least one liquid container is arranged in the cavity and used for bearing target liquid;
the heating module is used for increasing the temperature of the cavity;
the steam injection module is used for injecting high-temperature steam into the cavity;
the detection module comprises: a temperature detection unit and a pressure detection unit;
the pressure detection unit is used for detecting the pressure in the cavity;
the temperature detection unit is used for detecting the temperature change value in the cavity, the temperature change value of the liquid in the cavity wall and the sample container before and after the heating module is heated
According to the liquid temperature measuring method, the processor and the system provided by the embodiment of the invention, the loading capacity is accurately calculated through the pressure fluctuation of saturated steam in the sterilization cavity, the cavity wall temperature fluctuation or the sampling temperature fluctuation of the sample container, so that the comprehensive heat conduction coefficient of the container in the cavity is derived, and finally the average temperature value of the liquid loading can be calculated through the obtained two parameters, so that the problem of large errors among the cavity wall temperature, the temperature of the sample container and the average temperature of the liquid in the actual loading container in the current liquid sterilization process is corrected.
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In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings used in the description of the embodiments or the prior art will be briefly described below, it is obvious that the drawings in the following description are only some embodiments of the present invention, and for those skilled in the art, other drawings can be obtained according to these drawings without any creative effort.
FIG. 1 is a flow chart of a liquid temperature measurement method according to an embodiment of the present invention;
FIG. 2 is a schematic diagram showing the relationship between the temperature drop of the vapor in the chamber and the temperature rise of the loaded liquid provided by the present embodiment;
fig. 3 is a block diagram of a liquid temperature measurement processor according to an embodiment of the present invention.
Detailed Description
In order to make the objects, technical solutions and advantages of the present invention more apparent, the technical solutions of the present invention will be described in detail below. It is to be understood that the described embodiments are merely exemplary of the invention, and not restrictive of the full scope of the invention. All other embodiments, which can be derived by a person skilled in the art from the examples given herein without making any creative effort, shall fall within the protection scope of the present invention.
In order to more clearly illustrate the procedures and advantages of the method of the present embodiment, the present invention provides a liquid temperature measuring method, which includes:
defining target steam sterilization equipment, placing at least one liquid container in a cavity of the target steam sterilization equipment, injecting high-temperature steam into the cavity until the high-temperature steam is saturated, and heating the liquid container;
obtaining the heat dissipation rate in the cavity;
increasing the temperature in the cavity, and acquiring the pressure change value in the cavity before and after heating, the temperature change value of the cavity wall and the liquid in the sample container;
based on the law of conservation of energy, calculating the volume of the liquid in the cavity according to the volume of the cavity, the change value of the pressure in the cavity, the change value of the temperature of the cavity wall or the change value of the temperature of the liquid in the sample container;
based on Newton's cooling law, calculating the overall thermal conductivity of the liquid loaded in the container in the cavity and the container according to the volume of the cavity and the heat dissipation rate in the cavity;
the average temperature of the liquid is calculated from the liquid volume and the bulk thermal conductivity.
The pressure fluctuation of saturated steam in the sterilization cavity, the cavity wall temperature fluctuation and the sample container sampling temperature fluctuation are accurately calculated, the comprehensive heat conduction coefficient of container loading in the cavity is derived, and finally the average temperature value of liquid loading is calculated through the obtained two parameters, so that the problem of large errors among the cavity wall temperature, the sample container temperature and the average temperature of liquid in an actual loading container in the current liquid sterilization process is solved.
Based on the liquid temperature measuring method, the embodiment of the invention provides an optional embodiment: FIG. 1 is a flow chart of a liquid temperature measurement method according to an embodiment of the present invention. Referring to fig. 1, the liquid temperature measuring method of the present embodiment may include the steps of:
s11, defining target steam sterilization equipment, placing at least one liquid container in a cavity of the target steam sterilization equipment, injecting high-temperature steam into the cavity until the high-temperature steam is saturated, and heating the liquid container.
Specifically, a steam sterilization device is defined as a target steam sterilization device, at least one liquid container is placed into a cavity of the device, high-temperature steam is injected into the closed cavity until the closed cavity is saturated, and the liquid container is heated according to actual requirements.
For example, in the scientific research project of the embodiment, the target steam sterilization equipment is selected to sterilize the liquid. Adding liquid into a liquid container, placing at least one liquid container with a movable probe and a plurality of movable probes into a cavity of a sterilization device, and injecting high-temperature steam into the sealed cavity to heat the cavity.
When the temperature in the cavity rises to TBLANC(TBLANCNot less than 100 deg.C, temperature of cavity wall), closing steam port or other heating source, and closing exhaust port to maintain the cavity in sealed space state, and recording pressure P in the cavityBLANCMaintaining for E seconds, the pressure in the cavity begins to decrease due to heat loss, and after E seconds, the pressure in the cavity decreases to PETemperature drop to TE(Chamber wall temperature), by mechanical or manual means, recording PEAnd TEThe specific numerical value of (1).
And s12, obtaining the heat loss rate in the cavity.
For example, in this embodiment, let the temperature drop difference before and after the cavity cooling be TD＝TBLANC-TE(ii) a Setting the pressure drop difference of the cavity before and after cooling to be PD＝PBLANC-PE。
And s121, acquiring the steam mole number of the liquid in the cavity at the first temperature.
In the present embodiment, intraluminal T is obtainedBLANCSteam molar number M at temperatureCAMB。
The volume (liter) of the cavity is set as VCAMB(ii) a Volume (liter) V of steam at one atmosphere pressure, assuming no condensation of steam at 4 ℃2The following formula is satisfied, and V is further obtained2The numerical value of (c).
For different substances with different masses, the energy content is the specific heat capacity and the mass temperature (the temperature is the kelvin temperature)
Kelvin temperature +273 degrees celsius, therefore, the following formula is obtained:
it is known that 1ml of water is vaporized into water vapor and has a volume of 1700ml at 4 ℃ and one atmosphere; the mol amount of water molecules is known to be 18, and the mass of 1ml of water is known to be 1 g. Thus at TBLANCMolar quantity M of water vapor in the whole cavity at temperatureCAMBThe following formula is satisfied:
MCAMB×18＝V2×1000/1700＝V2/1.7 (2)
further calculation of formula (2) yields (3):
MCAMB＝V2/30.6＝VCAMB×PBLANC/(273+TBLANC)×9.0523 (3)
in the formula (3), VCAMBAnd PBLANCAnd TBLANCAre known, and therefore, M can be calculatedCAMBThe value of (c).
And s122, acquiring heat released by the steam in the temperature reduction cavity according to the mole number of the steam.
In the present embodiment, M is calculated based on the number of moles of steamCAMBAnd calculating the heat released by the steam in the temperature reduction cavity.
According to the common knowledge, the specific heat capacity of water is 4.2KJ/Kg,
setting the heat quantity H released by temperature drop in the cavity1，
Then H1＝MCAMB×18÷1000×4.2×TD＝MCAMB×TD÷13.228 (4)
Since the amounts are known in the formula (4), H can be obtained1Numerical values.
And s123, obtaining a phase change enthalpy heat value released by condensation of steam in the cavity.
s1231, calculating the mole value of the steam in the cavity when the temperature is reduced to the second temperature;
calculating the temperature drop in the cavity to TEWhile the mole value M of the steam in the cavityE。
Assuming that steam does not condense at 4 ℃, volume V of steam at one atmosphere3The following formula is satisfied:
molar amount M of V3 liters of steamE：
And s1232, calculating the heat value of the phase change enthalpy released by the condensation of the steam in the cavity according to the molar value.
When the temperature in the cavity drops to TEWhen it is in common MCAMB-METhe molar steam phase changes to water, releasing heat.
Table 1 is a temperature table corresponding to the heat value of the phase change enthalpy during water evaporation, and a function F is set according to the table 1ENTHAL(T ℃) is the heat value (joules) of the phase transition enthalpy of 1kg of water at T ℃. Condensed water MCAMB-MEHeat released by mole H2Comprises the following steps:
H2＝FENTHAL(TE)×(MCAMB-ME) (6)
total heat H released by cooling in cavity and condensing steamE＝H1+H2And the energy lost by the cavity in the static heat preservation E second process.
| Temperature of | Pressure MPa | Enthalpy KJ/kg | Temperature of | Pressure MPa | Enthalpy KJ/ |
| 0 | 0.000611 | 2501.0 | 80 | 0.047359 | 2643.8 |
| 0.01 | 0.000611 | 2501.0 | 85 | 0.057803 | 2652.1 |
| 1 | 0.000657 | 2502.8 | 90 | 0.070108 | 2660.3 |
| 2 | 0.000705 | 2504.7 | 95 | 0.084525 | 2668.4 |
| 3 | 0.000758 | 2506.5 | 100 | 0.101325 | 2676.3 |
| 4 | 0.000813 | 2508.3 | 110 | 0.14326 | 2691.8 |
| 5 | 0.000872 | 2510.2 | 120 | 0.19854 | 2706.6 |
| 6 | 0.000935 | 2512.0 | 130 | 0.27012 | 2720.7 |
| 7 | 0.001001 | 2513.9 | 140 | 0.36136 | 2734 |
| 8 | 0.001072 | 2515.7 | 150 | 0.47597 | 2746.3 |
| 9 | 0.001147 | 2517.5 | 160 | 0.61804 | 2757.7 |
| 10 | 0.001227 | 2519.4 | 170 | 0.79202 | 2768 |
| 11 | 0.001312 | 2521.2 | 180 | 1.0027 | 2777.1 |
| 12 | 0.001402 | 2523.0 | 190 | 1.2552 | 2784.9 |
| 13 | 0.001497 | 2524.9 | 200 | 1.5551 | 2791.4 |
| 14 | 0.001597 | 2526.7 | 210 | 1.9079 | 2796.4 |
| 15 | 0.001704 | 2528.6 | 220 | 2.3201 | 2799.9 |
| 16 | 0.001817 | 2530.4 | 20 | 2.7979 | 2801.7 |
| 17 | 0.001936 | 2532.2 | 240 | 3.348 | 2801.6 |
| 18 | 0.002063 | 2534.0 | 250 | 3.9776 | 2799.5 |
| 19 | 0.002196 | 2535.9 | 260 | 4.694 | 2795.2 |
| 20 | 0.002337 | 2537.7 | 270 | 5.5051 | 2788.3 |
| 22 | 0.002642 | 2541.4 | 280 | 6.4191 | 2778.6 |
| 24 | 0.002982 | 2545.0 | 290 | 7.4448 | 2765.4 |
| 26 | 0.00336 | 2543.6 | 300 | 8.5917 | 2748.4 |
| 28 | 0.003779 | 2552.3 | 310 | 9.8697 | 2726.8 |
| 30 | 0.004242 | 2555.9 | 320 | 11.29 | 2699.6 |
| 35 | 0.005622 | 2565.0 | 330 | 12.865 | 2665.5 |
| 40 | 0.007375 | 2574.0 | 340 | 14.608 | 2622.3 |
| 45 | 0.009582 | 2582.9 | 350 | 16.537 | 2566.1 |
| 50 | 0.012335 | 2591.8 | 360 | 18.674 | 2485.7 |
| 55 | 0.01574 | 2600.7 | 370 | 21.053 | 2335.7 |
| 60 | 0.019919 | 2609.5 | 371 | 21.306 | 2310.7 |
| 65 | 0.025008 | 2618.2 | 372 | 21.562 | 2280.1 |
| 70 | 0.031161 | 2626.8 | 373 | 21.821 | 2238.3 |
| 75 | 0.038548 | 2635.3 | 374 | 22.084 | 2150.7 |
TABLE 1
And s124, acquiring the heat loss rate in the sterilization cavity according to the heat released by the steam in the cavity and the heat value of the phase change enthalpy released by the condensation of the steam in the cavity after the temperature is reduced.
HR＝HE/E＝(H1+H2) E, then H can be calculatedR。
HRTo be at a temperature TCAMBRate of heat loss per second of this machine at temperature.
It is worth mentioning that it is possible to show,HRis a constant specific to one machine. This constant calculation is only required once before major components (chamber/insulation/heating unit) are replaced without major overhaul of the apparatus.
And s13, increasing the temperature in the cavity, and acquiring the pressure change value in the cavity before and after temperature rise, and the temperature change value of the cavity wall or the liquid in the sample container.
In this embodiment, after the heat dissipation rate of the target steam sterilization equipment is obtained, the equipment is left standing, and after the equipment returns to room temperature, the equipment is operated again.
Setting TGOALA temperature rise target value set for the program. A movable probe is ensured to be positioned in a liquid container at the central part in the cavity, and the liquid container is used as a sample container to detect the liquid temperature.
Running a liquid sterilization program, starting heating up the sterilization cavity, and when the temperature of the wall cavity or any probe in the cavity (a probe capable of detecting the temperature of steam in the cavity) is detected to be increased to TCAMBWhen the steam source is closed, the steam source or any other heating source is closed, and all the exhaust ports are tightly closed, so that the cavity is sealed. Wherein, 100 DEG C<TCAMB<TGOAL. Recording the pressure P of the equipment cavity at this timeCAMBAnd the temperature T of the liquid in the sample containerB0. The recording mode is not limited at this time, and the recording mode can be manual recording or self-recording according to a preset program.
The apparatus is kept in this state for F seconds, and the pressure P in the chamber after F is recorded2Temperature of the steam in the chamber (or temperature of the wall of the chamber) T2Temperature T of the liquid sample vesselB2。
s14, calculating the volume of the liquid in the cavity according to the volume of the cavity, the pressure change value in the cavity, the temperature change value of the cavity wall or the temperature change value of the liquid in the sample container based on the law of conservation of energy.
In this embodiment, the volume of the liquid loaded in the chamber is set as VLOAD。
Calculating the temperature in the cavity as TCAMBSteam in molar quantity per liter and temperature T2The difference in steam per liter mole value. The calculation method isThe above method is described and will not be described herein.
The heat value of the phase change enthalpy released by the condensation of the steam in the cavity due to the temperature reduction is as follows:
difference in molar value per liter × (V)CAMB-VLOAD)。
The difference of the mol value per liter is known, and the temperature T of the steam in the cavity is calculatedCAMBDown to T2And, heat released per liter, then:
total heat released by temperature drop (V) x heat released per literCAMB-VLOAD)。
It is known that the amount of heat absorbed is a constant, with a temperature rise of one degree per liter of liquid. According to the law of energy conservation, the energy transfer of the liquid in the cavity conforms to the following law:
absorption energy x V of liquid temperature riseLOAD(heat released by temperature drop of steam in cavity + heat released by phase change) × (V)CAMB-VLOAD)
Wherein, VCAMBIs a known constant, from which the volume V of liquid loaded in the chamber is calculatedLOAD。
s15, calculating the overall thermal conductivity of the liquid loaded in the container and the container according to the volume of the cavity and the heat dissipation rate in the cavity based on Newton's law of cooling.
Newton's law of cooling, it is known that the energy of heat transfer per unit time is proportional to the temperature difference between two objects.
FIG. 2 is a schematic diagram of the relationship between the temperature drop of the vapor in the chamber and the temperature rise of the loading liquid provided in this embodiment, and referring to FIG. 2, the function T of the relationship between the temperature of the vapor in the chamber and the time can be derived1(n) temperature of the liquid charge as a function of time T2(n)。
At any time, the temperature of the vapor decreases to release energy-the heat loss of the cavity increases to absorb energy.
Heat loss in the cavity (heat loss rate in the cavity) and energy released by steam temperature decrease
Thus, V can be obtained by calculus operation.LOADFor lifting liquid (containing vessel)Bulk thermal conductivity RLOAD。
The inverse equivalence of newton's law of cooling is:
the equivalent pressure drop time of the two cavities under the same temperature condition can be measured, and the two times are respectively t1And t2。
At t1And t2During the period, the pressure drop values in the cavity are the same, and the values of releasing energy to the loaded liquid are the same; the liquid temperature rise values are the same, thus obtaining the formula:
further derivation of equation (8) yields:
in the formula (9), since t1And t2Is a known number measured, and therefore, the bulk thermal conductivity R of the liquid charge can be obtained by calculus, Newton's iteration, or exhaustive methodsLOAD。
s16, calculating the average temperature of the liquid based on the volume of the liquid and the overall thermal conductivity.
Since the total thermal conductivity R of the loading container is known.LOADAccording to the reverse derivation of the Newton's law of thermodynamics, the heat energy transferred in unit time is in direct proportion to the temperature difference between the container and the cavity and the loading capacity.
After the loading of the apparatus has been determined, the heating is stopped for n seconds at any time during the sterilization procedure, and the pressure change in the chamber and the temperature change in the liquid load are measured, and the total value of the heat transfer from the steam to the liquid load is obtained. And performing calculus operation again to obtain the total heat value G released by the pressure change in the cavity at the moment of n seconds. The chamber temperature (or chamber wall temperature) is known to be detectable, so that an accurate average temperature of the liquid loading can be determined. The specific formula used is as follows:
energy G released by pressure drop in cavity is liquid loading temperature difference TD1X liquid volume VLOADX liquid specific heat capacity; the specific heat capacity, the liquid capacity and the energy G are all known, and the temperature difference T is obtainedD1。
According to newton's law of cooling, one can obtain:
in the last step, R has already been determinedLOADAnd the depressurization time T can be measuredD1Has obtained TCAMBThe exact temperature T of the solution at the moment of measurement, i.e. the exact average temperature of the liquid load, has been measured and thus calculated.
According to the liquid temperature calculation method, loading capacity is accurately calculated through pressure fluctuation of saturated steam in the sterilization cavity, cavity wall temperature fluctuation or sample container sampling temperature fluctuation, further the comprehensive heat conduction coefficient loaded by the container in the cavity is derived, finally the average temperature value of liquid loading can be calculated through the obtained two parameters, and the problem of large errors among the cavity wall temperature, the sample container temperature and the average temperature of liquid in an actual loading container in the current liquid sterilization process is corrected.
In order to further explain the technical solution of the present invention, an embodiment of the present invention further provides a processor for measuring a liquid temperature. Fig. 3 is a structural diagram of a liquid temperature measurement processor according to an embodiment of the present invention, and referring to fig. 3, the processor for liquid temperature measurement according to the embodiment includes: an acquisition module 31, a first calculation module 32, a second calculation module 33, and a third calculation module 34.
The obtaining module 31 is configured to obtain a rate of heat dissipation in the cavity of the target steam sterilization apparatus, and obtain a pressure change value in the cavity before and after the temperature of the target steam sterilization apparatus is raised, and a temperature change value of the liquid in the cavity wall or the sample container.
The first calculating module 32 is configured to calculate the volume of the liquid according to the volume of the cavity, a change value of pressure in the cavity, a change value of temperature of the cavity wall, or a change value of temperature of the liquid in the sample container, based on an energy conservation law.
And the second calculating module 33 is configured to calculate the overall thermal conductivity between the liquid loaded in the container and the container in the cavity according to the volume of the cavity and the heat dissipation rate in the cavity based on newton's law of cooling.
And a third calculating module 34 for calculating the average temperature of the liquid according to the volume of the liquid and the overall thermal conductivity.
With regard to the processor in the above-described embodiment, the specific manner in which each module performs operations has been described in detail in the embodiment related to the method, and will not be elaborated here.
It should be noted that the form of the processor executing the calculation steps of the present invention includes, but is not limited to: an applet, a manual calculation, or a computer calculation. Any method without creative work based on the technical steps belongs to the protection scope of the invention.
The liquid temperature measurement processor of this embodiment carries out the accurate calculation of loading capacity through the pressure fluctuation of saturated steam in to the sterilization cavity, chamber wall temperature fluctuation or sample container sampling temperature fluctuation, and then seeks out the comprehensive heat conduction coefficient that the container loaded in the intracavity, and the average temperature value that liquid loaded is calculated to two parameters that finally the accessible obtained, has corrected the present liquid sterilization in-process, the problem of the great error between chamber wall temperature, sample container temperature and the average temperature of the interior liquid of the actual loading container.
For further explanation of the technical solution of the present invention, an embodiment of a liquid temperature measurement system is also provided. The liquid temperature measuring system of the present embodiment includes: the processor and at least one steam sterilizer; the steam sterilizer includes: the device comprises a cavity, a heating module or a steam injection module and a detection module; at least one liquid container is arranged in the cavity and used for bearing target liquid; the heating module is used for increasing the temperature of the cavity; the steam injection module is used for injecting high-temperature steam into the cavity; a detection module comprising: a temperature detection unit and a pressure detection unit; the pressure detection unit is used for detecting the pressure in the cavity; the temperature detection unit is used for detecting the temperature change value in the cavity, the temperature change value of the cavity wall and the temperature change value of the liquid in the sample container before and after the heating module is heated.
Wherein, the cavity of the steam sterilizer is required to be connected with an external steam source, and the steam injection with the dryness reaching 99 percent can be continuously provided.
The total heat loss rate of the cavity is lower than 0.35KJ/min/liter under the condition of 121 ℃.
The precision of a temperature probe adopted by the sterilizer reaches 0.1 ℃, and the temperature probe is accurately checked; and the accuracy of the pressure sensor is required to reach 0.1KPA, and the pressure sensor is accurately checked.
With regard to the system in the above embodiment, the specific manner in which each module/unit performs the operation has been described in detail in the embodiment related to the method, and will not be elaborated here.
The liquid temperature measuring system of this embodiment, through the pressure fluctuation to the saturated steam in the sterilization cavity, chamber wall temperature fluctuation and sample container sampling temperature fluctuation, carry out the accurate calculation of loading capacity, and then the comprehensive heat conduction coefficient of derivation intracavity container loading, two parameters that the final accessible obtained calculate the average temperature value that liquid loaded, have corrected the problem of the great error between the average temperature of present liquid sterilization in-process, chamber wall temperature, sample container temperature and the actual interior liquid of loading container.
The above description is only for the specific embodiment of the present invention, but the scope of the present invention is not limited thereto, and any person skilled in the art can easily conceive of the changes or substitutions within the technical scope of the present invention, and all the changes or substitutions should be covered within the scope of the present invention. Therefore, the protection scope of the present invention shall be subject to the protection scope of the appended claims.
It is understood that the same or similar parts in the above embodiments may be mutually referred to, and the same or similar parts in other embodiments may be referred to for the content which is not described in detail in some embodiments.
It should be noted that the terms "first," "second," and the like in the description of the present invention are used for descriptive purposes only and are not to be construed as indicating or implying relative importance. Further, in the description of the present invention, "a plurality" means at least two unless otherwise specified.
Any process or method descriptions in flow charts or otherwise described herein may be understood as representing modules, segments, or portions of code which include one or more executable instructions for implementing specific logical functions or steps of the process, and alternate implementations are included within the scope of the preferred embodiment of the present invention in which functions may be executed out of order from that shown or discussed, including substantially concurrently or in reverse order, depending on the functionality involved, as would be understood by those reasonably skilled in the art of the present invention.
It should be understood that portions of the present invention may be implemented in hardware, software, firmware, or a combination thereof. In the above embodiments, the various steps or methods may be implemented in software or firmware stored in memory and executed by a suitable instruction execution system. For example, if implemented in hardware, as in another embodiment, any one or combination of the following techniques, which are known in the art, may be used: a discrete logic circuit having a logic gate circuit for implementing a logic function on a data signal, an application specific integrated circuit having an appropriate combinational logic gate circuit, a Programmable Gate Array (PGA), a Field Programmable Gate Array (FPGA), or the like.
It will be understood by those skilled in the art that all or part of the steps carried by the method for implementing the above embodiments may be implemented by hardware related to instructions of a program, which may be stored in a computer readable storage medium, and when executed, the program includes one or a combination of the steps of the method embodiments.
In addition, functional units in the embodiments of the present invention may be integrated into one processing module, or each unit may exist alone physically, or two or more units are integrated into one module. The integrated module can be realized in a hardware mode, and can also be realized in a software functional module mode. The integrated module, if implemented in the form of a software functional module and sold or used as a stand-alone product, may also be stored in a computer readable storage medium.
The storage medium mentioned above may be a read-only memory, a magnetic or optical disk, etc.
In the description herein, references to the description of the term "one embodiment," "some embodiments," "an example," "a specific example," or "some examples," etc., mean that a particular feature, structure, material, or characteristic described in connection with the embodiment or example is included in at least one embodiment or example of the invention. In this specification, the schematic representations of the terms used above do not necessarily refer to the same embodiment or example. Furthermore, the particular features, structures, materials, or characteristics described may be combined in any suitable manner in any one or more embodiments or examples.
Although embodiments of the present invention have been shown and described above, it is understood that the above embodiments are exemplary and should not be construed as limiting the present invention, and that variations, modifications, substitutions and alterations can be made to the above embodiments by those of ordinary skill in the art within the scope of the present invention.
Claims (10)
1. A method of measuring liquid temperature, the method comprising:
defining target steam sterilization equipment, placing at least one liquid container in a cavity of the target steam sterilization equipment, injecting high-temperature steam into the cavity until the high-temperature steam is saturated, and heating the liquid container;
obtaining the heat dissipation rate in the cavity;
increasing the temperature in the cavity, and acquiring a pressure change value in the cavity and a temperature change value of liquid in the cavity wall or the sample container before and after temperature rise;
calculating the volume of the liquid in the cavity according to the volume of the cavity, the change value of the pressure in the cavity, the change value of the temperature of the cavity wall or the change value of the temperature of the liquid in the sample container based on an energy conservation law;
calculating the overall thermal conductivity of the liquid loaded in the container in the cavity and the container according to the volume of the cavity and the heat dissipation rate in the cavity based on Newton's cooling law;
calculating the average temperature of the liquid based on the volume of the liquid and the bulk thermal conductivity.
2. The method of claim 1, wherein said obtaining a rate of heat loss within said cavity comprises:
obtaining the steam mole number of the liquid in the cavity at a first temperature;
acquiring heat released by steam in the temperature reduction cavity according to the steam mole number;
obtaining a phase change enthalpy heat value released by steam condensation in the cavity;
and acquiring the heat loss rate in the sterilization cavity according to the heat released by the steam in the temperature reduction cavity and the heat value of the phase change enthalpy released by the condensation of the steam in the cavity.
3. The method of claim 2, wherein said obtaining the caloric value of the phase change enthalpy released by the condensation of the vapor in the chamber comprises:
calculating the mole value of the steam in the cavity when the temperature is reduced to the second temperature;
and calculating the phase change enthalpy heat value released by the condensation of the steam in the cavity according to the molar value.
4. The method of claim 1, wherein the raising the temperature in the cavity to obtain the pressure change in the cavity before and after the temperature rise, the temperature change of the liquid in the cavity wall and the sample container comprises:
and when the temperature of the cavity wall or at least one thermal probe in the cavity reaches a set temperature, stopping heating the cavity and sealing the cavity.
5. The method of claim 4, wherein the temperature of the liquid in the sample container before the temperature rise is detected as a temperature of the liquid container in a central portion of the cavity.
6. The method of claim 1, wherein calculating the bulk thermal conductivity of the container and the liquid contained within the chamber comprises: the difference between the energy released by the decrease in temperature of the vapor and the amount of heat dissipated in the cavity is equal to the energy absorbed by the increase in temperature of the liquid over any period of time.
7. The method of claim 6 wherein the amount of heat dissipated in the chamber is equal to the product of the rate of heat dissipated in the chamber and the energy released by the decrease in temperature of the vapor.
8. The method of claim 1, wherein said calculating said liquid average temperature comprises: the heat energy conducted in unit time is proportional to the temperature difference between the container and the cavity and the loading capacity.
9. A processor for temperature measurement of a liquid, the processor comprising: the device comprises an acquisition module, a first calculation module, a second calculation module and a third calculation module;
the acquisition module is used for acquiring the heat loss rate in the cavity of the target steam sterilization equipment and acquiring the pressure change value in the cavity and the temperature change value of liquid in the cavity wall or the sample container before and after the temperature of the target steam sterilization equipment is raised;
the first calculation module is used for calculating the liquid volume according to the cavity volume, the pressure change value in the cavity, the cavity wall temperature change value or the liquid temperature change value in the sample container based on an energy conservation law;
the second calculation module is used for calculating the overall thermal conductivity of the liquid loaded in the container in the cavity and the container according to the volume of the cavity and the heat dissipation rate in the cavity based on Newton's cooling law;
the third calculating module is used for calculating the average temperature of the liquid according to the volume of the liquid and the overall thermal conductivity.
10. A liquid temperature measurement system, the system comprising: the processor of claim 9 and at least one steam sterilizer; the steam sterilizer includes: the device comprises a cavity, a heating module or a steam injection module and a detection module;
at least one liquid container is arranged in the cavity and used for bearing target liquid;
the heating module is used for increasing the temperature of the cavity;
the steam injection module is used for injecting high-temperature steam into the cavity;
the detection module comprises: a temperature detection unit and a pressure detection unit;
the pressure detection unit is used for detecting the pressure in the cavity;
the temperature detection unit is used for detecting the temperature change value in the cavity, the temperature change value of the cavity wall and the temperature change value of the liquid in the sample container before and after the heating module is heated.
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