CN113288054A - Human body metabolism heat production measuring device and method based on closed space carbon dioxide concentration change - Google Patents
Human body metabolism heat production measuring device and method based on closed space carbon dioxide concentration change Download PDFInfo
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- 238000004519 manufacturing process Methods 0.000 title claims abstract description 38
- CURLTUGMZLYLDI-UHFFFAOYSA-N Carbon dioxide Chemical compound O=C=O CURLTUGMZLYLDI-UHFFFAOYSA-N 0.000 title claims abstract description 32
- 229910002092 carbon dioxide Inorganic materials 0.000 title claims abstract description 27
- 230000008859 change Effects 0.000 title claims abstract description 20
- 239000001569 carbon dioxide Substances 0.000 title claims abstract description 16
- 238000000034 method Methods 0.000 title claims abstract description 15
- 230000004060 metabolic process Effects 0.000 title claims abstract description 12
- 238000001514 detection method Methods 0.000 claims abstract description 20
- 230000033001 locomotion Effects 0.000 claims abstract description 20
- 239000002207 metabolite Substances 0.000 claims abstract description 19
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- 230000002503 metabolic effect Effects 0.000 claims description 39
- 238000006243 chemical reaction Methods 0.000 claims description 8
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- 238000005516 engineering process Methods 0.000 description 3
- 239000000203 mixture Substances 0.000 description 3
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Abstract
The invention relates to a human body metabolism heat production measuring device and method based on closed space carbon dioxide concentration change, the device comprises: a closed structural space module; an accidental risk prevention module: which is connected with the structural space module and is used for preventing unexpected risks and safety problems in the structural space module; a motion adjustment module: the device is arranged in the structural space module and is used for adjusting the motion state of the object to be measured; the environment control module has a temperature and humidity adjusting function; a metabolite detection module: which is arranged in the structural space module and is used for the real-time detection of CO in the structural space module2And (4) concentration. Compared with the prior art, the invention has the advantages of high accuracy, small measurement difficulty and good economy, and can be widely applied to human body heat comfort research in building environmentBelongs to the field.
Description
Technical Field
The invention belongs to the technical field of human body metabolism heat production measurement, and relates to a human body metabolism heat production measurement device and method based on closed space carbon dioxide concentration change.
Background
Human thermal comfort is a basic scientific problem in the field of building environment research and is also an important basis for building a comfortable energy-saving building environment; among factors affecting human thermal comfort, metabolic heat generation directly affects the thermal equilibrium state of the human body, and is a basic parameter for thermal comfort research. Therefore, accurate description of metabolic heat production of the human body is a cornerstone for the thermal comfort study of the building environment. In the field of building environment design, the method of metabolic heat production corresponding to typical activity states in the ISO8996 standard is mainly used to estimate the heat dissipation capacity of human bodies, and the clustering coefficient is used to correct the differences of different functional rooms in the aspects of gender, age, weight and the like of people.
At present, there are several kinds of measuring equipment which can be used for the research of metabolic heat production of human body in building environment, wherein, a pedometer and a heart rate meter for metabolic heat production through step conversion and heart rate conversion belong to wearable equipment, and are used for recording the activity level of human body in real time, but the equipment has the problem of low accuracy; the metabolic heat and energy production metabolism cabin utilizing the isotope tracing double-standard water method and the chemical composition conversion consumed and produced by the human body has the problems of expensive instruments, extremely high experiment cost, long experiment time and the like although the accuracy and reliability are good, and the technical monopoly problem still exists as the human body energy metabolism cabin is not built in China as long as 2012 is reached according to the literature review of Luqi et al. Unlike the above-described methods and apparatus, in recent years the approach has been based on the passage of O2Consumption, CO2The human body metabolic rate measuring technology of the metabolic heat indirect heat measuring method by conversion of the generated quantity is developed rapidly, such as a Vmax Encore metabolic measuring instrument and a Cosmed K5 portable gas analyzer, the accuracy and convenience of the device are greatly improved, however, unfortunately, the core technology of the portable human body metabolic measuring instrument is monopolized by foreign companies, corresponding products can not be found at home, the device is very expensive, and the selling price is as high as 50-100 million RMB; the basic principles of the existing other portable human body metabolism measuring instrument Douglas gas analysis bag are similar, some difficulties are avoided in the measuring technology, the price is relatively low, but the method cannot measure the generation on the time scale of minutesThe law of variation of production of heat.
In view of the problems of low accuracy, poor convenience, high price or technical monopoly and the like of the existing human metabolic heat production measuring equipment, a new metabolic heat production measuring device is independently developed and accurately describes the characteristic rule of human metabolic heat production, and the equipment becomes a key point and a difficult point which need to be broken through urgently in the field of thermal comfort research. For example, chinese patent application No. CN201310296899.1, "a metabolic measurement method based on noninvasive blood glucose detection", the principle of the device is: the heat dissipated between the local body surface of the human body and the environment through three heat transfer modes of convection, evaporation and radiation is respectively measured through a temperature sensor, a humidity sensor and a radiation sensor; the method is characterized in that a human body heat balance equation established by a first thermodynamic law is utilized, relevant parameters are selected, a mathematical model is established, and the human body local tissue metabolic rate is obtained. The invention is characterized in that the human body heat dissipation capacity is directly calculated through a human body heat dissipation numerical model, however, the heat dissipation capacity in three forms of convection, evaporation and radiation can hardly be accurately measured due to various human body forms, complex dressing and extremely complex heat exchange with the environment.
Disclosure of Invention
The invention aims to provide a human body metabolic heat production measuring device and method based on the change of the concentration of carbon dioxide in a closed space, so as to realize accurate measurement of human body metabolic heat production, reduce measurement difficulty and the like.
The purpose of the invention can be realized by the following technical scheme:
one of the technical schemes of the invention provides a human metabolic heat production measuring device based on closed space carbon dioxide concentration change, which comprises:
a closed structural space module;
an accidental risk prevention module: which is connected with the structural space module and is used for preventing unexpected risks and safety problems in the structural space module;
a motion adjustment module: the device is arranged in the structural space module and is used for adjusting the motion state of the object to be measured;
the environment control module has a temperature and humidity adjusting function;
a metabolite detection module: which is arranged in the structural space module and is used for the real-time detection of CO in the structural space module2And (4) concentration.
Furthermore, the structural space module is a closed cabin or a closed small chamber, and the size of the structural space module is (1.5-3.5) × (1.5-3.5) m3. Preferably, the size is 2.5X 2.5m3。
Further, unexpected risk prevention module including arranging airtight emergency exit and the observation window on the structure space module, wherein, airtight emergency exit can two-wayly open, and when airtight emergency exit open the back, the inner space and the exterior space intercommunication of structure space module. The sealed safety door adopts a door structure which is conventional in the field and can be opened in two directions (namely has inward and outward opening functions), and is the first important guarantee for preventing suffocation in a high-tightness structural space; the observation window can be formed by a glass window with one transparent and breakable surface, the transparency of the observation window can be used for observing the experimental conditions of personnel in the high-tightness structural space, and when the suffocation risk occurs in the high-tightness structural space, the glass window can be broken, so that the safety of the tested personnel is guaranteed.
Furthermore, the movement adjusting module comprises a portable movement stair, a treadmill, an ergonomic chair and the like which are independently arranged, and the movement equipment can be a conventional product model sold in the field.
Further, the environment control module comprises a temperature and humidity regulator, and optionally, the environment control module is a fluorine-free variable frequency air conditioner (non-fresh air). The device can monitor and adjust the temperature and humidity in a high-tightness structural space in real time, wherein the temperature control precision is +/-1 ℃; the relative humidity control accuracy is +/-5%.
Furthermore, the metabolite detection module comprises a plurality of COs2And the concentration sensors are uniformly arranged at the diagonal positions of the structural space module by the stay cables.
Further, the measuring device also includes an air mixing module mounted within the structural space module. Furthermore, the air mixing module is a fan.
The measuring device also comprises a numerical analysis module connected with the metabolite detection module, and during work, the numerical analysis module receives CO fed back by the metabolite detection module2And (4) processing the concentration information to obtain the metabolic heat production of the measured object. The numerical analysis module may be composed of a data storage, a data reader, a data converter, a data display, etc., or may be a computer conventional in the art, and is configured to perform the following functions: namely CO fed back by metabolite detection module2The concentration information is converted into human body metabolism heat production, and the specific conversion formula is as follows:
wherein M is the measured metabolic thermogenesis (W/M)2) RQ is the respiratory quotient, i.e. CO is generated2And consumption of O2The molar ratio of (a); qCO2To produce CO2Volume flow rate (mL/s); a. thedIs the body surface area (m2) and can be obtained by height and weight calculation using the DuBois formula.
The second technical scheme of the invention provides a closed space-based CO2The method for measuring the metabolic heat production of the human body with the concentration change is realized by adopting the test device, and comprises the following steps:
(1) starting an environment control module, and adjusting the temperature and the humidity in the structural space module to set values;
(2) after the structural space module is confirmed to be completely sealed, the object to be measured enters the structural space module, and the activity level of the object to be measured is adjusted through the motion adjusting module;
(3) real-time measurement of CO at different activity levels using metabolite detection module2The concentration changes and the metabolic thermogenesis at the corresponding activity level is obtained through conversion.
Compared with the prior art, the invention has the following advantages:
1) based on the indirect heat measurement principle, the metabolic product of the human body is used for converting the metabolic heat of the human body, the measurement result is accurate, the precision requirement of the human body heat comfort research of the building environment can be met, and the method is particularly suitable for measuring the metabolic heat of the human body in a short time (such as half an hour to about one hour);
2) by utilizing the high-tightness structural space and the air mixing module, the technical difficulty of time-by-time human body expiratory airflow flow and metabolite concentration change in the conventional measuring equipment is avoided, the measuring difficulty is greatly reduced, and the measuring cost is further reduced;
3) the device has great plasticity and wide application range, and can be developed into two metabolic heat production measuring devices, namely a closed small chamber and a gas storage small chamber, by adjusting the volume of a high-tightness structural space, wherein the former emphasizes accuracy and is suitable for laboratory research, and the latter emphasizes convenience and is suitable for field investigation research.
Drawings
FIG. 1 is a schematic structural view of the present invention;
the notation in the figure is:
1-structural space module, 2-accident risk prevention module, 21-observation window, 22-sealed safety door, 3-movement regulation module, 31-ergonomic chair, 32-treadmill, 33-portable movement stair, 4-environment control module, 5-metabolite detection module and 6-air mixing module.
Detailed Description
The invention is described in detail below with reference to the figures and specific embodiments. The present embodiment is implemented on the premise of the technical solution of the present invention, and a detailed implementation manner and a specific operation process are given, but the scope of the present invention is not limited to the following embodiments.
In the following embodiments, unless otherwise specified, functional components or module structures are all conventional components or module structures used in the art to implement corresponding functions.
Example 1:
as shown in FIG. 1, the present invention is based on a closed capsule CO2The device for measuring human metabolic heat production by concentration change comprises: high-tightness structural space module 1, accident risk monitoring module and transportation systemA dynamic regulation module 3, an environmental control module 4, a metabolite detection module 5 (i.e. CO)2Concentration detection module), an air mixing module 6.
The high-tightness structural space module 1 is respectively connected with the accident risk monitoring module and the partial environment control module 4, the movement adjusting module 3 is positioned inside the high-tightness structural space module 1, the air mixing module 6 is positioned at the top of the high-tightness structural space module 1, and the metabolite detection module 5 is positioned on a diagonal line of the small chamber. The high-tightness structural space module 1 is 2.5 multiplied by 2.5m3The cabin mainly comprises cast-in-place reinforced concrete and reinforcing steel bars, and fireproof and waterproof materials are coated on the outer wall body, so that the sealed cabin has good sealing performance.
The accident risk prevention module 2 is connected with the high-airtightness structure space module 1, so that the personnel dynamics and the experimental condition in the airtight cabin can be monitored in real time, and the accident risk and the experimental safety problem can be effectively prevented. The accident risk monitoring module employs a sealed safety door 22 and a viewing window 21 made of high performance glass on one side. The airtight safety door 22 has the characteristic of double-sided door opening, so that the condition that the door can be opened from the inner side and the outer side is ensured, and the safety of experimenters is guaranteed. The door and window (the observation window 21) made of the high-performance glass has good firmness and performance, and can conveniently observe the experimental conditions of personnel in the capsule, so that the glass can be easily broken, and broken glass slag is relatively blunt, so that the harm to the personnel is relatively small.
The exercise adjustment module 3 may consist of a portable exercise staircase 33, a high performance multi-mode treadmill 32, and an ergonomic chair 31. The movement adjusting module 3 can enable the testee to be in different movement states, wherein the portable stair can simulate the movement state of the testee climbing stairs; a high-performance multi-mode treadmill 32 that adjusts the activity level of the subject person using its speed, slope adjustment function and running belt stability maintenance function; the ergonomic chair 31 can adjust the movement states of sitting and lying.
The environment adjusting module consists of a variable-frequency temperature and humidity adjuster and an air humidifier, the device can monitor and adjust the temperature and the humidity in the high-tightness structural space in real time, and can control the temperature in the closed space to be any temperature of 15-35 ℃, and the temperature control precision is +/-1 ℃; the relative humidity control accuracy is + -10%.
The metabolite detection module 5 consists of two inhaul cables and six CO2Concentration detector, wherein CO2Concentration detector (using conventional CO)2Concentration sensor can) is about 2%, according to the error transfer principle, this precision level can guarantee that metabolic heat production measuring error is within 5%, and then guarantees that the PMV predicted value precision of calculating according to experimental metabolic rate is within 0.3 scale.
The air mixing module 6 is composed of an aerodynamic device (such as a fan like a ceiling fan or a floor fan), and can uniformly mix air components in a high-tightness structural space within 1 minute by adjusting the rotating speed and the direction of the aerodynamic device, so that CO obtained by measuring at different positions can be obtained2The concentration difference is within 20 ppm.
The autonomous numerical analysis module can be composed of a data memory, a data reader, a data converter and a data display, and can also be replaced by a computer, the autonomous numerical analysis module can convert the measurement result of the metabolite detection module 5 into human metabolic heat production quantity and display the metabolic heat production quantity in real time, and the specific conversion formula is as follows:
wherein M is the measured metabolic thermogenesis (W/M)2) RQ is the respiratory quotient, i.e. CO is generated2And consumption of O2The molar ratio of (a); qCO2To produce CO2Volume flow rate (mL/s); a. thedIs the body surface area (m2) and can be obtained by height and weight calculation using the DuBois formula.
The gas-liquid separation device based on the closed cabin CO2The device for measuring the metabolic heat production of the human body by the concentration change comprises the following steps:
1) closing the closed chamber door, and detecting whether the air tightness of the closed chamber reaches a standard value;
2) starting the environment control module 4, and adjusting the temperature and the humidity in the closed cell to reach a proper range;
3) opening the closed chamber door, closing the closed door after the subject enters the closed chamber, weighing, measuring the height, and calculating the human body surface area of the subject through the height and the weight by using a DuBois or Perkins formula;
4) starting the air mixing module 6 to uniformly mix the air in the closed chamber;
5) adjusting the motion state of the subject by using a motion adjusting module 3;
6) starting metabolite detection module 5 to measure CO of the testee in real time when the testee sits still, runs and goes up and down stairs2Change in concentration and O2A concentration change curve;
7) calculating the metabolic rate of the testee in different motion states by using a formula (1);
8) and drawing the final result into a chart form for displaying.
The embodiments described above are described to facilitate an understanding and use of the invention by those skilled in the art. It will be readily apparent to those skilled in the art that various modifications to these embodiments may be made, and the generic principles described herein may be applied to other embodiments without the use of the inventive faculty. Therefore, the present invention is not limited to the above embodiments, and those skilled in the art should make improvements and modifications within the scope of the present invention based on the disclosure of the present invention.
Claims (10)
1. The utility model provides a human metabolism heat production measuring device based on airtight space carbon dioxide concentration changes which characterized in that includes:
a closed structural space module;
an accidental risk prevention module: which is connected with the structural space module and is used for preventing unexpected risks and safety problems in the structural space module;
a motion adjustment module: the device is arranged in the structural space module and is used for adjusting the motion state of the object to be measured;
the environment control module has a temperature and humidity adjusting function;
a metabolite detection module: which is arranged in the structural space module and is used for the real-time detection of CO in the structural space module2And (4) concentration.
2. The device for measuring metabolic heat production of human body based on carbon dioxide concentration change in the closed space as claimed in claim 1, wherein the structural space module is a closed cabin or a closed chamber, and the size of the structural space module is (1.5-3.5) × (1.5-3.5) m3。
3. The apparatus for measuring metabolic heat production of human body based on carbon dioxide concentration change in enclosed space according to claim 1, wherein the accident risk prevention module comprises an enclosed safety door and an observation window arranged on the structural space module, wherein the enclosed safety door can be opened in two directions, and when the enclosed safety door is opened, the inner space of the structural space module is communicated with the outer space.
4. The apparatus for measuring the production of heat of human metabolism based on the change of carbon dioxide concentration in an enclosed space according to claim 1, wherein the exercise adjustment module comprises a portable exercise staircase, a treadmill and an ergonomic chair, which are independently installed.
5. The human metabolic heat production measuring device based on the carbon dioxide concentration change in the closed space as claimed in claim 1, wherein the environment control module comprises a temperature and humidity regulator.
6. The human metabolic heat production measuring device based on the carbon dioxide concentration change of the closed space as claimed in claim 1 or 5, wherein the environment control module is a fluorine-free variable frequency air conditioner.
7. According to claim 1The human body metabolism heat production measuring device based on the closed space carbon dioxide concentration change is characterized in that the metabolite detection module comprises a plurality of CO2And the concentration sensors are uniformly arranged at the diagonal positions of the structural space module by the stay cables.
8. The apparatus for measuring metabolic heat production of human body based on carbon dioxide concentration change in enclosed space as claimed in claim 1, further comprising an air mixing module installed in the structural space module.
9. The human metabolism heat production measuring device based on the closed space carbon dioxide concentration change as claimed in claim 1, wherein the measuring device further comprises a numerical analysis module connected with the metabolite detection module, and during operation, the numerical analysis module receives CO fed back by the metabolite detection module2And (4) processing the concentration information to obtain the metabolic heat production of the measured object.
10. A method for measuring metabolic heat production of a human body based on the change of carbon dioxide concentration in a closed space, which is realized by adopting the device for measuring metabolic heat production of a human body as claimed in any one of claims 1 to 9, and is characterized by comprising the following steps:
(1) starting an environment control module, and adjusting the temperature and the humidity in the structural space module to set values;
(2) after the structural space module is confirmed to be completely sealed, the object to be measured enters the structural space module, and the activity level of the object to be measured is adjusted through the motion adjusting module;
(3) real-time measurement of CO at different activity levels using metabolite detection module2The concentration changes and the metabolic thermogenesis at the corresponding activity level is obtained through conversion.
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- 2021-05-20 CN CN202110553198.6A patent/CN113288054A/en active Pending
Patent Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2007167170A (en) * | 2005-12-20 | 2007-07-05 | Fuji Ika Sangyo Kk | High-analytical human calorie meter |
| CN107529996A (en) * | 2015-04-30 | 2018-01-02 | 雷迪奥米特巴塞尔股份公司 | The non-invasive optical detecting of carbon dioxide partial pressure |
| DE102015012472A1 (en) * | 2015-09-29 | 2017-03-30 | Drägerwerk AG & Co. KGaA | Method for determining the energy expenditure of a patient, patient data processing device and incubator for newborns |
| JP2019076163A (en) * | 2017-10-20 | 2019-05-23 | 国立大学法人北海道大学 | Metabolism measuring system and metabolism measuring method |
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Non-Patent Citations (1)
| Title |
|---|
| 罗茂辉: "建筑环境人体热适应规律与调节机理研究", 《中国博士学位论文全文数据库 (工程科技Ⅱ辑)》, no. 2, 15 February 2019 (2019-02-15), pages 038 - 2 * |
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