This article details the design, modeling, construction, and evaluation of an open system calorimeter that operates in a normal room environment to measure endothermic or exothermic events in a system subjected to a steady heat flux. The calorimeter is unique because it allows the measurement of energy and power from an "open" system, where a heat flux enters and leaves the calorimetric boundary in a well-controlled manner. It is also novel because it utilizes a solid state heating and cooling assembly that acts as an electronic heat reservoir. The system is capable of measuring power levels from a few milliwatts to several watts, and it has been designed and optimized to be nearly immune to variations at ambient temperature and room airflow. The calorimeter was modeled using lumped parameter electrical-thermal equivalent circuits in SPICE software. This modeling in the electrical domain led to the use of a mathematical correction factor that mitigates mismatches in thermal conduction paths between an active and a passive cell as well as correcting differences in the sensitivities of the flux sensors employed for heat flow measurement. After obtaining a viable design, a prototype was constructed and validated with precise input power delivered via electric joule heating of a resistive element.

中文翻译：

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固态、开放系统、差示量热仪

本文详细介绍了开放式系统热量计的设计、建模、构造和评估，该热量计在正常房间环境中运行，以测量承受稳定热通量的系统中的吸热或放热事件。量热计是独一无二的，因为它允许从“开放”系统测量能量和功率，在该系统中，热通量以良好控制的方式进入和离开量热边界。它也很新颖，因为它利用了充当电子蓄热器的固态加热和冷却组件。该系统能够测量从几毫瓦到几瓦的功率水平，并且经过设计和优化，几乎不受环境温度和室内气流变化的影响。热量计使用 SPICE 软件中的集总参数电热等效电路建模。这种在电气领域的建模导致使用数学校正因子，以减轻有源和无源电池之间热传导路径的不匹配，并校正用于热流测量的通量传感器的灵敏度差异。在获得可行的设计后，构建并验证了原型，并通过电阻元件的电焦耳加热提供精确的输入功率。这种在电气领域的建模导致使用数学校正因子，以减轻有源和无源电池之间热传导路径的不匹配，并校正用于热流测量的通量传感器的灵敏度差异。在获得可行的设计后，构建并验证了原型，并通过电阻元件的电焦耳加热提供精确的输入功率。这种在电气领域的建模导致使用数学校正因子，以减轻有源和无源电池之间热传导路径的不匹配，并校正用于热流测量的通量传感器的灵敏度差异。在获得可行的设计后，构建并验证了原型，并通过电阻元件的电焦耳加热提供精确的输入功率。