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首页> 外文期刊>Thermochimica Acta: An International Journal Concerned with the Broader Aspects of Thermochemistry and Its Applications to Chemical Problems >CORRECTING HEAT STORAGE IN A CALORIMETRIC CHAMBER BY A TWO-COMPARTMENT-MODEL
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CORRECTING HEAT STORAGE IN A CALORIMETRIC CHAMBER BY A TWO-COMPARTMENT-MODEL

机译：通过两室模型校正量热室中的热量存储

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Direct calorimetry is used for investigating combustion energy of fuels, thermic properties of materials and metabolic processes. Its results, however, may be influenced by the dynamic properties of the equipment, if they are not much faster than those of the subject. When performing direct calorimetry at living beings, the dynamic properties of the system chamber-interior-subject must be taken into account. A simple model is known to correct for the dilution of metabolic gases in the chamber. Heat, however, is not simply diluted; it is stored in the chamber's interior and the subject's body too. A two-compartment-model was shown to correct heat storage effects in a furnished human calorimetric chamber. A method was established to estimate proper model parameter from alcohol combustion as calibration experiments. Heat storage resulted in 7.8 +/- 1.1% of all heat measured after extinguishing the flame. The 'wake period' lasted more than 3 h. Using the two-compartment-model this was overcorrected to -1.6 + 1.9% with the 'wake period' being less than 15 min. Humans or animals in the chamber would change the model parameter dramatically due to their large heat capacity. The corresponding parameters could not be derived from only a few calibration experiments; more work needs to be done in the future. (C) 1997 Elsevier Science B.V. [References: 9]
机译：直接量热法用于研究燃料的燃烧能量，材料的热性质和代谢过程。但是，其结果可能会受到设备动态特性的影响，如果它们的速度不快于对象的动态特性的话。当对生物进行直接量热时，必须考虑系统室内-室内对象的动力学特性。已知一种简单的模型可以校正腔室中新陈代谢气体的稀释。然而，热量并不能简单地稀释。它被存储在室内和对象的体内。展示了一种两室模型，该模型可以校正配备的人体量热室内的储热效果。建立了一种通过酒精燃烧估算适当模型参数的方法，作为校准实验。蓄热导致火焰熄灭后测得的所有热量的7.8 +/- 1.1％。 “唤醒期”持续了超过3小时。使用两室模型时，“唤醒时间”少于15分钟，因此将其过度校正为-1.6 + 1.9％。室内的人或动物由于其大的热容量而将极大地改变模型参数。仅通过几次校准实验就无法得出相应的参数。将来需要做更多的工作。 （C）1997 Elsevier Science B.V. [参考：9]

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