Natural convection and thermal radiation experimental apparatus
This device experiments on how heat is transmitted by large changes in pressure and clarifies the differences between radiation and natural convection. It consists of a steel pressure vessel (cylindrical), a control device, a vacuum pump, and a regulator for compressed air. A small heater is suspended in the center of the pressure vessel, and thermocouples for temperature measurement are installed on the heater surface and the vessel wall. The temperatures of the heater and the vessel, as well as the pressure, are displayed digitally. Additionally, the heater surface and the inside of the vessel are blackened to act as ideal thermal radiators. In the experiment, compressed air can be filled up to a maximum of 125 kPa (gauge pressure), and a vacuum of approximately -100 kPa (gauge pressure) can be achieved. Creating a vacuum state reduces heat loss due to convection, allowing for more accurate measurements of heat transfer. The emissivity of the surface is measured, the Stefan-Boltzmann law is demonstrated, and the understanding of dimensionless characteristics using Nusselt number, Grashof number, Prandtl number, and Knudsen number is developed. By using the accompanying data acquisition system (VDAS), various data can be collected and analyzed in real-time on a PC (sold separately).
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basic information
TD1011V Specifications Dimensions and Weight: W670 x D480 x H1020mm, approximately 105kg Power Supply: AC100V/10A or single-phase AC200V/5A, 50/60Hz Container Lid Weight: 1.1kg Maximum Supply Pressure: 1000kPa (gauge pressure) *Supply compressor sold separately Maximum Experimental Pressure: 125kPa (gauge pressure) adjustable via relief valve in control panel Container Allowable Pressure: Maximum 250kPa (absolute pressure) Heater Element: Inconel 800 tube, diameter 6.25mm, length 160mm Heater Nominal Area: 0.00314m², matte black coating (emissivity 0.95) Heater Maximum Temperature: Approximately 200℃ Thermocouple: K-type thermocouple x2 locations, digital display Maximum Vacuum Pressure: Approximately 10Pa (absolute pressure) Low-Medium Pressure Sensor: Measurement above approximately 25kPa (absolute pressure), maximum allowable pressure 400kPa Vacuum Pressure Sensor: Measurement below approximately 10kPa (absolute pressure), maximum allowable pressure 900kPa Included Software: VDAS software (PC sold separately) for displaying and saving various data Software Operating Environment: Microsoft Windows 8, 10 Operating Temperature Range: +5℃ to +40℃
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Applications/Examples of results
This device conducts experiments to investigate how heat is transmitted due to significant changes in pressure, clarifying the differences between radiation and natural convection. It consists of a steel pressure vessel (cylindrical shape), a control device, a vacuum pump, and a regulator for compressed air. A small heater is suspended in the center of the pressure vessel, and thermocouples for temperature measurement are installed on the heater surface and the vessel wall. The temperatures of the heater and the vessel, as well as the pressure, are displayed digitally. Additionally, the heater surface and the inside of the vessel are blackened to serve as ideal thermal radiators.
Detailed information
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Custom calculation formula input and layout changes are possible. Screen diagram of VDAS (accessories).
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Container internal diagram
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Overall structure diagram
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Megakemu designs, manufactures, and imports various experimental and practical equipment for universities, junior colleges, technical colleges, high schools, and vocational schools nationwide. While the world has made advancements in various fields, it seems that our Earth's environment is being disturbed by ourselves and is approaching its limits. The world is seeking new Japanese technologies that coexist with the Earth's environment.