Simplified COP Correlations for Industrial Heat Pumps using the 2nd Law Efficiency

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  • KAIDA Takenobu
    Central Research Institute of Electric Power Industry Department of Mechanical Engineering, Graduate School of Engineering, Kyushu University
  • MORI Shoji
    Department of Mechanical Engineering, Faculty of Engineering, Kyushu University

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Other Title
  • 第2法則効率を用いた産業用ヒートポンプのCOP簡易相関式
  • ダイ2 ホウソク コウリツ オ モチイタ サンギョウヨウ ヒートポンプ ノ COP カンイ ソウカンシキ

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<p>This study aims to develop a unified and simple method for estimating the energy performance of a wide variety of industrial heat pumps. First, energy performance data on industrial heat pumps available in the Japanese market are collected and analyzed. Then, based on the regression analysis, two types of correlations between Lorenz efficiency, which is the second law efficiency, and logarithmic mean temperature lift are developed. The first type correlation can estimate the average COP (coefficient of performance) of industrial heat pumps with single stage cycles with an accuracy of approximately within ±10%. On the other hand, the second type correlation represents the highest performance of existing technologies including two stage cycles and cascade cycles. Both correlations can be calculated by inputting 6 parameters: heat source medium, heat sink medium, heat source inlet and outlet temperatures, and heat sink inlet and outlet temperatures.</p>

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