Thermal Blitz
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Heat flow meters and probes were used to measure heat fluxes at up to 200 positions on cathode shells and cradles and up to 60 positions on anode panels of a cell to assess its thermal balance. The measurements were transferred to an Excel spreadsheet which performed averaging of heat fluxes for different surfaces and calculated total cell heat loss by summing heat losses of individual surfaces. The cell heat loss measured in this thermal blitz process must be comparable to the cell's internally assessed heat for the results to be considered reliable.
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Kogemused tootmise juhtimise tarkvara juurutusest ja näited elust enesest - K...
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Digitaalselt eksporditurgudele. Taavi Raidma - 13.aprill 2016
Digitaalselt eksporditurgudele. Taavi Raidma - 13.aprill 2016
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Research proposal: Thermoelectric cooling in electric vehicles
This experiment aims to characterize a thermoelectric cooler (TEC) for cooling electric vehicle batteries by measuring its Seebeck coefficient and coefficient of performance (COP). A small-scale system using a hot plate, TEC module, and fan will simulate an EV battery cooling system. Temperature and voltage measurements taken with and without the hot plate will be used to calculate the Seebeck coefficient and COP of the TEC and determine the uncertainty in these values. The results will help engineers evaluate TECs for optimal battery thermal management.
Portfolio Po-Chun Kang
This document summarizes a student project analyzing the effectiveness of different fin designs on a CPU heatsink. It includes the design of a base heatsink model with 30 fins and details simulations varying the number of fins, fin height, and rotation speed. The results show that increasing the number of fins from 30 to 50 lowers the maximum surface temperature by 5.4°C, while further increases do not impact temperature as much.
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The document discusses using an F-test to compare the variances of temperature measurements from two different thermocouples (T-type and K-type). The F-value calculated was larger than the critical F-value, so the null hypothesis that the variances are equal was rejected, indicating the variances of the two sets of temperature measurements are unequal. A silicon wafer was then heated on a hotplate to further assess the precision of a pyrometer relative to a surface-attached thermocouple.
DSC.pdf
This document provides information about differential scanning calorimetry (DSC):
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This document provides an overview of differential scanning calorimetry (DSC). DSC is a thermal analysis technique that measures the heat absorbed or released by a sample as it is heated, cooled, or held at constant temperature. It can be used to analyze properties such as glass transition temperatures, melting points, heat capacity, and more. The summary discusses:
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Thermal cycling screens involve cycling hardware between high and low temperatures to induce failures. Method A for developing a thermal cycling profile uses a thermal survey to tailor cycle characteristics, equipment conditions, and number of cycles to the specific hardware. An ideal thermal survey involves computer modeling, constructing a test facility replica, instrumenting hardware, and performing experimental trials to establish screening parameters that achieve desired hardware temperature histories. Key parameters include temperature extremes and rates of change, dwell times at extremes, and whether hardware is powered during screening.
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The document summarizes the fabrication and testing of a heat exchanger test rig. Key points:
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Fike tested the effects of increasing power density and energy augmented combustion on clean agent concentrations required for fire suppression in data centers. Testing involved simulating heat radiating from servers using hot plates at various orientations and power levels from 5-20kW/m2, both with and without air movement. All tests passed with standard agent concentrations, even above ASHRAE 2020 power density estimates, when the hot plates were covered with copper to match server materials. The results show that proper analysis of real-world conditions is needed to accurately assess energy augmentation threats in data centers.
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The document describes heat exchangers and experiments conducted using a shell and tube heat exchanger and a plate heat exchanger. It discusses three types of fluid flow - parallel, counter, and cross-flow. Experiments were conducted with both exchangers under parallel and counter-flow configurations. Temperature and flow rate data was collected and used to calculate effectiveness, heat transfer coefficients, and log mean temperature difference. The results showed that the counter-flow configuration had higher effectiveness compared to parallel flow in both exchangers.
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The document discusses the coefficient of performance (COP) as it relates to heat pumps and refrigeration systems. It provides definitions and equations for calculating COP for both heating and cooling applications. Higher COP values indicate greater efficiency, with optimal performance dependent on factors like temperature differences and system design. Real-world COP is typically lower than theoretical maximums due to irreversible processes and other losses.Upgrading of Low Temperature Solar Heat with Cascade Vapor Compression and Ab...
International Journal of Modern Engineering Research (IJMER) is Peer reviewed, online Journal. It serves as an international archival forum of scholarly research related to engineering and science education.
International Journal of Modern Engineering Research (IJMER) covers all the fields of engineering and science: Electrical Engineering, Mechanical Engineering, Civil Engineering, Chemical Engineering, Computer Engineering, Agricultural Engineering, Aerospace Engineering, Thermodynamics, Structural Engineering, Control Engineering, Robotics, Mechatronics, Fluid Mechanics, Nanotechnology, Simulators, Web-based Learning, Remote Laboratories, Engineering Design Methods, Education Research, Students' Satisfaction and Motivation, Global Projects, and Assessment…. And many more.
Design & CFD Analysis of Heat Exchanger
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This document summarizes the numerical analysis of different parallel plate heat sink designs for electronic cooling applications. It discusses:
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Fraunhofer IBP comparative tests with ecofective system EE2
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Research proposal: Thermoelectric cooling in electric vehicles
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Fraunhofer IBP comparative tests with ecofective system EE2
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power generation using stirling engine and solar energy
power generation using stirling engine and solar energy