Heat Flux Sensor ( Wärmeflußsensor ) is a commonly used name for a sensor that emits a signal proportional to the heat flux through the sensor’s area.
Content
- 1 Application
- 1.1 Applications in building physics
- 1.2 Applications in the textile industry
- 2 Measurement methods
- 3 notes
- 4 References
Application
Heat flux sensors can be used for a variety of applications. One of the most promising areas of their application is to study the quality of thermal insulation of buildings, as well as the thermal insulation properties of textiles by measuring the heat transfer coefficient [1] of the studied object. In addition, possible applications include the measurement of fluid and gas flow rates [2] , the determination of temperature by non-invasive methods [3] , and the measurement of laser radiation power [4] .
Building Physics Applications
Every day, a huge amount of energy is spent on heating and cooling buildings, most of which have sufficiently low thermal insulation, often not meeting modern standards [5] . In this regard, one of the most important applications of heat flow sensors is to control the quality of building insulation by measuring the heat transfer coefficient [6] .
Indeed, according to the law of heat transfer, the density of the heat flux [7] through the surface, such as the walls of a building, is directly proportional to the temperature difference on the external and internal surface of the object (wall) [8] . This proportionality coefficient is called the heat transfer coefficient, or U- factor [9] . In this case, the ratio of the heat flux density measured using the heat flux sensor to the temperature difference allows you to determine the desired parameter - heat transfer coefficient: the lower it is, the better the insulation of the object under study (for example, the wall of the building) [10] .
Textile Applications
The value of the heat flux density is also an important parameter in the development of clothing for athletes and even firefighters [11] . Indeed, the ratio of the heat flux density measured using the heat flux sensor according to the procedure described above to the temperature difference on the inner and outer surfaces of the clothing element allows us to determine the heat transfer coefficient of the fabric material, which is necessary when developing heat-resistant clothing sets [12] .
Measurement Methods
The method of measuring the heat flux density is based on measuring the temperature difference on the "auxiliary wall" (plate) installed on the building envelope. This temperature difference, proportional to the direction of the heat flux of its density, is converted into an emf thermocouple batteries located in the "auxiliary wall" parallel to the heat flux and connected in series by the generated signal. The “auxiliary wall” and the thermocouple battery form a heat flux converter [13] .
Notes
- ↑ 6-2. HEAT TRANSFER THROUGH THE WALL unspecified . info.sernam.ru. Date of treatment June 15, 2016.
- ↑ Heat flux sensor for ash fouling monitoring .
- ↑ Reto Niedermann, Eva Wyss, Simon Annaheim, Agnes Psikuta, Sarah Davey. Prediction of human core body temperature using non-invasive measurement methods // International Journal of Biometeorology. - 2014-01-01. - T. 58 , no. 1 . - S. 7-15 . - ISSN 1432-1254 . - DOI : 10.1007 / s00484-013-0687-2 .
- ↑ High-precision thermal sensors for laser power detection and heat flux measurements . www.waldytech.com. Date of treatment June 15, 2016.
- ↑ Damian Carrington. Britain's damp, leaky homes among Europe's most costly to heat . the Guardian (November 29, 2013). Date of treatment June 15, 2016.
- ↑ U-Value Measurement instead of U-Value Calculation (German) . U-Value and Building Physics. Date of treatment June 15, 2016.
- ↑ Heat flux density q is ... What is Heat flux q? . Dictionaries and Encyclopedias on the Academician. Date of treatment June 15, 2016.
- ↑ XuMuK.ru - Heat transfer through a flat wall. “HEAT ENGINEERING. COURSE OF LECTURES ", Scriabin V.I. . www.xumuk.ru. Date of treatment June 15, 2016.
- ↑ R-value (insulation ) // Wikipedia, the free encyclopedia. - 2016-06-10.
- ↑ greenTEG AG Switzerland: Thermal Sensing & Energy Harvesting. U-Value Measurements with greenTEG's U-Value Kit (December 1, 2015). Date of treatment June 15, 2016.
- ↑ Textile Fabrics and Thermal Insulators .
- ↑ Evaluation of New Test Methods for Fire Fighting Clothing .
- ↑ Measurement of heat flux density . www.printsip.ru. Date of treatment June 15, 2016.
Links
- https://www.youtube.com/watch?time_continue=1&v=I671gfYb9ko
- http://www.hukseflux.com/downloads/thermalScience/applicAndSpec.pdf
- http://www.omega.com/pptst/HFS-3_HFS-4.html
- http://www.azosensors.com/equipment-category.aspx?cat=54
- http://shop.greenteg.com/wp-content/uploads/gSKIN_Heat-Flux-Sensors-RD_Datasheet_v3.14.pdf (link not available)