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      Industrial heat pump integration in non-continuous processes using thermal energy storages as utility - An NLP enhancement of the graphical approach

      Stampfli, Jan A.; Atkins, Martin John; Olsen, Donald G.; Wellig, Beat; Walmsley, Michael R.W.; Neale, James R.
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      DOI
       10.3303/CET1870299
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      Stampfli J.A., Atkins M.J., Olsen D.G., Wellig B., Walmsley M.R.W., Neale J.R., 2018, Industrial heat pump integration in non-continuous processes using thermal energy storages as utility – an nlp enhancement of the graphical approach , Chemical Engineering Transactions, 70, 1789-1794 DOI:10.3303/CET1870299
      Permanent Research Commons link: https://hdl.handle.net/10289/13825
      Abstract
      The aim of this paper is to enhance the results of the graphical approach for Heat Pump (HP) integration in noncontinuous processes. A nonlinear programming (NLP) formulation is developed which optimizes temperature levels of condensation, evaporation, and storage temperature layers in order to further reduce total annual cost (TAC) and greenhouse gas (GHG) emissions. In addition, the NLP formulation requires low computation time given the practical approach. By its application on an AMMIX butter production of a large dairy factory, it is shown, that the temperature differences in the condenser and evaporator are reduced sharply which improves the COP of the HP from 2.2 to 3.4. As a result, the TAC can be reduced by an additional 16,721 NZD/y and the GHG emissions by an additional 29 tCO2/y in comparison to the graphical approach.
      Date
      2018
      Type
      Journal Article
      Rights
      © 2018, AIDIC Servizi S.r.l.
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      • Science and Engineering Papers [3122]
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