Importance of the reconciliation method to handle experimental data in refrigeration and power cycle: application to a reversible heat pump/organic Rankine cycle unit integrated in a positive energy building

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• 作者：Olivier Dumont ; Sylvain Quoilin…
• 关键词：Reconciliation method ; Experimental analysis ; Reversible heat pump/organic Rankine cycle
• 刊名：International Journal of Energy and Environmental Engineering
• 出版年：2016
• 出版时间：June 2016
• 年：2016
• 卷：7
• 期：2
• 页码：137-143
• 全文大小：718 KB
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• 作者单位：Olivier Dumont (1)
  Sylvain Quoilin (1)
  Vincent Lemort (1)
  
  1. Aerospatial and Mechanical Engineering Department/Energy Systems, University of Liege, Liege, Belgium
  
• 刊物主题：Renewable and Green Energy;
• 出版者：Springer Berlin Heidelberg
• ISSN：2251-6832
• 卷排序：7

文摘

Experimental data is often the result of long and costly experimentations. Many times, measurements are used directly without (or with few) analysis and treatment. This paper, therefore, presents a detailed methodology to use steady-state measurements efficiently in the analysis of a thermodynamic cycle. The reconciliation method allows to correct each measurement as little as possible, taking its accuracy into account, to satisfy all constraints and to evaluate the most probable physical state. The reconciliation method should be used for multiple reasons. First, this method allows to close energy and mass balances exactly, which is needed for predictive models. Also, it allows determining some unknowns that are not measured or that cannot be measured precisely. Furthermore, it fully exploits the collected measurements with redundancy and it allows to know which sensor should be checked or replaced if necessary. An application of this method is presented in the case of a reversible HP/ORC unit. This unit is a modified heat pump which is able to work as an organic Rankine cycle by reversing its cycle. Combined with a passive house comprising a solar roof and a ground heat exchanger, it allows to get a positive energy building. In this study case, the oil mass fraction is not measured despite its strong influence on the results. The reconciliation method allows to evaluate it. The efficiency of this method is proven by comparing the error on the outputs of steady-state models of compressor and exchangers. An example is given with the prediction of the pinch-point of an evaporator. In this case, the normalized root mean square deviation (NRMSD) is decreased from 14.3 to 4.1 % when using the reconciliation method. This paper proves that the efficiency of the method and also that the method should be considered more often when dealing with experimentation. Keywords Reconciliation method Experimental analysis Reversible heat pump/organic Rankine cycle