Techno-economic analysis of a steam supply heat pump system (Potential for cost reduction through adoption of refrigerants with high critical temperatures and removal of a steam compressor)

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  • KAIDA Takenobu
    Central Research Institute of Electric Power Industry Department of Mechanical Engineering, Graduate School of Engineering, Kyushu University
  • ANDERSEN Martin Pihl
    Department of Civil and Mechanical Engineering, Technical University of Denmark
  • MORI Shoji
    Department of Mechanical Engineering, Faculty of Engineering, Kyushu University

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Other Title
  • 蒸気供給ヒートポンプシステムの技術経済性分析（高温冷媒の採用と水蒸気圧縮機の撤去によるコスト削減の可能性）

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<p>High-temperature heat pumps represent a pivotal technology in the pursuit of decarbonizing industrial process heating with the utmost efficiency. Steam serves as the energy carrier for many industrial systems, making steam supply heat pumps as a promising approach for efficient decarbonization. An existing heat pump-based steam supply system with a supply steam temperature of 135°C or higher consists of the following 3 units; a heat pump unit with the mixture of R245fa and R134a, a flash tank unit, and a steam compressor unit. However, recent developments in refrigerants for higher applications have increased the technology options for the system configuration of steam supply heat pump. Specifically, it will be possible to supply steam at a level of 150°C, which could not be achieved with conventional refrigerants such as R245fa and R134a due to the critical temperature constraints. In this paper, a thermal and economic model for a steam supply heat pump system is developed based on the test results with the existing system. The model is applied to analyze the change in COP (coefficient of performance) and LCOH (levelized cost of heat) when changing to new refrigerants under the condition of 150°C steam supply. As a result, we clarify the couple of changing the refrigerant form the conventional R245fa to R1336mzz(Z) or R601 and removing the steam compressor can improve the COP and also reduce the LCOH.</p>

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