Development and application of numerical model of thermal sensors for thermal protective clothing evaluation based on CFD simulation

PurposeThe purpose of this paper is to study the heat transfer effect of copper sensor and skin simulant on skin.Design/methodology/approachFor the sensor, the physical and mathematical models of the thermal sensors were used to obtain the definite conditions in the heat transfer process of the sensor, and the heat transfer models of the two sensors were developed and solved respectively by using ANSYS WORKBENCH 19.0 software. The simulation results were compared with the experimental test results. For the skin, the numerical model of the skin model was developed and calculated. Finally, the heat transfer simulation performance of the two sensors was analyzed.FindingsIt is concluded that the copper sensor is more stable than the skin simulant, but the material and structure of the skin simulant is more suitable for skin simulation. The skin simulant better simulates the skin heat transfer. For all the factors in the model, the thermal properties of the material and the heat flux level are the key factors. The convective heat transfer coefficient, radiation heat transfer rate and the initial temperature have little influence on the results, which can be ignored.Research limitations/implicationsThe results show that there are still some differences between the experimental and numerical simulation values of the skin simulant. In the future, the thermal parameters of skin simulant and the influence of the thermocouple adhesion should be further examined during the calibration process.Practical implicationsThe results suggest that the skin simulant needs to be further calibrated, especially for the thermal properties. The copper sensor on the flame manikin can be replaced by the skin simulant with higher accuracy, which will be helpful to improve the accuracy of performance evaluation of thermal protective clothing.Social implicationsThe application of computational fluid dynamics (CFD) technology can help to analyze the heat transfer simulation mechanism of thermal sensor, explore the influence of thermal performance of thermal sensor on skin simulation, provide basis for the development of thermal sensor and improve the application system of thermal sensor. Based on the current research status, this paper studies the internal heat transfer of the sensor through the numerical modeling of the copper sensor and skin simulant, so as to analyze the effect of the sensor simulating skin and the reasons for the difference.Originality/valueIn this paper, the sensor itself is numerically modeled and the heat transfer inside the sensor is studied.

BOX PENGHANGAT MAKANAN PENDAMPING AIR SUSU IBU MENGGUNAKAN TERMOELEKTRIK

The importance of complementary foods as complementary feeding for babies has become breastfeeding mother’s common knowledge. Impaired growth and development of infants and children aged 12-24 months is the low quality of complementary foods caused by unsanitary storage areas and uncontrolled temperatures. Therefore, a research was made in the form of designing a complementary food warmer box which aims to maintain the quality of complementary foods for breastfeeding, especially for career women who spend most of their time outside the home and not with babies. The MPASI heating box is made using a Peltier module with a thermoelectric working concept powered by an electric current or battery so that it can be used anywhere and anytime. Keywords: MPASI; Thermal Sensor; Thermoelectric; Warming Box Abstrak: Pentingnya MPASI sebagai asupan pendamping bayi sudah menjadi pengetahuan umum setiap ibu menyusui. Gangguan tumbuh kembang bayi dan anak usia 12-24 bulan disebabkan rendahnya mutu MPASI karena tempat penyimpanan yang kurang bersih dan suhu yang tidak terjaga. Dengan demikian dibuatlah penelitian berupa rancang bangun box penghangat MPASI dengan tujuan agar makanan pendamping ASI dapat terjaga kualitasnya, terutama bagi wanita bekerja yang menghabiskan sebagian besar waktunya diluar rumah tanpa bersama bayi. Box penghangat MPASI menggunakan konsep kerja termoelektrik dalam bentuk modul Peltier dengan sumber tegangan arus listrik atau baterai, sehingga dapat digunakan kapanpun dan dimanapun. Kata kunci: Box Penghangat; MPASI; Sensor Suhu; Termoelektrik

Virtual Thermal Sensor for Real-Time Monitoring of Electronic Packages in a Totally Enclosed System

This paper presents a virtual thermal sensor for real-time monitoring of electronic packages in a totally enclosed system.

Virtual Thermal Sensor for Real-Time Monitoring of Electronic Packages in a Totally Enclosed System

This paper presents a virtual thermal sensor for real-time monitoring of electronic packages in a totally enclosed system.

Facemask quality measurement using AMG8833 multiarray thermal sensor

Face masks have become a necessary thing that people need to wear daily. Even though some people might already be vaccinated, there is still a chance that the Covid-19 virus could still infect them. Hence, this paper presents a device developed to help determine the quality of face masks crucial in preventing the spread of the virus. These devices can calculate the temperature outside the face mask at a maximum distance of three meters. The way this device works is by measuring the temperature released out of the face mask. Here, the developments of the device with the ability to help determine the quality of face masks are explained and discussed. In the end, the device is perfectly functioning and definitely would assist in verifying the quality of the face masks being worn by someone. Two types of faces are used as test materials: the KN95 type face mask and the 3ply facemask used in Malaysia. Each facemask collected data from 30 minutes to 300 minutes for ten subjects over ten days. Studies that have been conducted show that the thermal value of the KN95 facemask increased to 30.27°C after 5 hours of use. At the same time, the 3ply type facemask offers a thermal value of up to 34.58oC after 5 hours of use. This shows a thermal value difference of up to 4.3PC for both facemasks after 5 hours of use.