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Hui-chu Chen - One of the best experts on this subject based on the ideXlab platform.

  • heat exchanger network synthesis involving organic rankine cycle for waste heat recovery
    Industrial & Engineering Chemistry Research, 2014
    Co-Authors: Cheng-liang Chen, Tzu-hsiang Chao, Feng-yi Chang, Hui-chu Chen
    Abstract:

    This article aims to present a mathematical model for the synthesis of a heat-exchanger network (HEN) which can be integrated with an organic Rankine cycle (ORC) for the recovery of low-grade waste heat from the heat surplus zone of the background process. An ORC-incorporated stagewise superstructure considering all possible heat-exchange matches between process Hot/cold streams and the ORC is first presented. On the basis of this superstructure, the model for synthesizing ORC-integrated HENs is formulated as a mixed-integer nonlinear program (MINLP). A two-step solution procedure is proposed to solve the MINLP model. First, a stand-alone HEN is synthesized to minimize the external Utility consumption. An ORC is then incorporated into the HEN with the objective of maximizing the work produced from waste heat (in the heat surplus zone below the process pinch) without increasing the use of a Hot Utility. A literature example is solved to demonstrate the application of the proposed model for industrial waste...

  • heat exchanger network synthesis involving organic rankine cycle for waste heat recovery
    Industrial & Engineering Chemistry Research, 2014
    Co-Authors: Cheng-liang Chen, Tzu-hsiang Chao, Feng-yi Chang, Hui-chu Chen
    Abstract:

    This article aims to present a mathematical model for the synthesis of a heat-exchanger network (HEN) which can be integrated with an organic Rankine cycle (ORC) for the recovery of low-grade waste heat from the heat surplus zone of the background process. An ORC-incorporated stagewise superstructure considering all possible heat-exchange matches between process Hot/cold streams and the ORC is first presented. On the basis of this superstructure, the model for synthesizing ORC-integrated HENs is formulated as a mixed-integer nonlinear program (MINLP). A two-step solution procedure is proposed to solve the MINLP model. First, a stand-alone HEN is synthesized to minimize the external Utility consumption. An ORC is then incorporated into the HEN with the objective of maximizing the work produced from waste heat (in the heat surplus zone below the process pinch) without increasing the use of a Hot Utility. A literature example is solved to demonstrate the application of the proposed model for industrial waste...

Cheng-liang Chen - One of the best experts on this subject based on the ideXlab platform.

  • heat exchanger network synthesis involving organic rankine cycle for waste heat recovery
    Industrial & Engineering Chemistry Research, 2014
    Co-Authors: Cheng-liang Chen, Tzu-hsiang Chao, Feng-yi Chang, Hui-chu Chen
    Abstract:

    This article aims to present a mathematical model for the synthesis of a heat-exchanger network (HEN) which can be integrated with an organic Rankine cycle (ORC) for the recovery of low-grade waste heat from the heat surplus zone of the background process. An ORC-incorporated stagewise superstructure considering all possible heat-exchange matches between process Hot/cold streams and the ORC is first presented. On the basis of this superstructure, the model for synthesizing ORC-integrated HENs is formulated as a mixed-integer nonlinear program (MINLP). A two-step solution procedure is proposed to solve the MINLP model. First, a stand-alone HEN is synthesized to minimize the external Utility consumption. An ORC is then incorporated into the HEN with the objective of maximizing the work produced from waste heat (in the heat surplus zone below the process pinch) without increasing the use of a Hot Utility. A literature example is solved to demonstrate the application of the proposed model for industrial waste...

  • heat exchanger network synthesis involving organic rankine cycle for waste heat recovery
    Industrial & Engineering Chemistry Research, 2014
    Co-Authors: Cheng-liang Chen, Tzu-hsiang Chao, Feng-yi Chang, Hui-chu Chen
    Abstract:

    This article aims to present a mathematical model for the synthesis of a heat-exchanger network (HEN) which can be integrated with an organic Rankine cycle (ORC) for the recovery of low-grade waste heat from the heat surplus zone of the background process. An ORC-incorporated stagewise superstructure considering all possible heat-exchange matches between process Hot/cold streams and the ORC is first presented. On the basis of this superstructure, the model for synthesizing ORC-integrated HENs is formulated as a mixed-integer nonlinear program (MINLP). A two-step solution procedure is proposed to solve the MINLP model. First, a stand-alone HEN is synthesized to minimize the external Utility consumption. An ORC is then incorporated into the HEN with the objective of maximizing the work produced from waste heat (in the heat surplus zone below the process pinch) without increasing the use of a Hot Utility. A literature example is solved to demonstrate the application of the proposed model for industrial waste...

Feng-yi Chang - One of the best experts on this subject based on the ideXlab platform.

  • heat exchanger network synthesis involving organic rankine cycle for waste heat recovery
    Industrial & Engineering Chemistry Research, 2014
    Co-Authors: Cheng-liang Chen, Tzu-hsiang Chao, Feng-yi Chang, Hui-chu Chen
    Abstract:

    This article aims to present a mathematical model for the synthesis of a heat-exchanger network (HEN) which can be integrated with an organic Rankine cycle (ORC) for the recovery of low-grade waste heat from the heat surplus zone of the background process. An ORC-incorporated stagewise superstructure considering all possible heat-exchange matches between process Hot/cold streams and the ORC is first presented. On the basis of this superstructure, the model for synthesizing ORC-integrated HENs is formulated as a mixed-integer nonlinear program (MINLP). A two-step solution procedure is proposed to solve the MINLP model. First, a stand-alone HEN is synthesized to minimize the external Utility consumption. An ORC is then incorporated into the HEN with the objective of maximizing the work produced from waste heat (in the heat surplus zone below the process pinch) without increasing the use of a Hot Utility. A literature example is solved to demonstrate the application of the proposed model for industrial waste...

  • heat exchanger network synthesis involving organic rankine cycle for waste heat recovery
    Industrial & Engineering Chemistry Research, 2014
    Co-Authors: Cheng-liang Chen, Tzu-hsiang Chao, Feng-yi Chang, Hui-chu Chen
    Abstract:

    This article aims to present a mathematical model for the synthesis of a heat-exchanger network (HEN) which can be integrated with an organic Rankine cycle (ORC) for the recovery of low-grade waste heat from the heat surplus zone of the background process. An ORC-incorporated stagewise superstructure considering all possible heat-exchange matches between process Hot/cold streams and the ORC is first presented. On the basis of this superstructure, the model for synthesizing ORC-integrated HENs is formulated as a mixed-integer nonlinear program (MINLP). A two-step solution procedure is proposed to solve the MINLP model. First, a stand-alone HEN is synthesized to minimize the external Utility consumption. An ORC is then incorporated into the HEN with the objective of maximizing the work produced from waste heat (in the heat surplus zone below the process pinch) without increasing the use of a Hot Utility. A literature example is solved to demonstrate the application of the proposed model for industrial waste...

Tzu-hsiang Chao - One of the best experts on this subject based on the ideXlab platform.

  • heat exchanger network synthesis involving organic rankine cycle for waste heat recovery
    Industrial & Engineering Chemistry Research, 2014
    Co-Authors: Cheng-liang Chen, Tzu-hsiang Chao, Feng-yi Chang, Hui-chu Chen
    Abstract:

    This article aims to present a mathematical model for the synthesis of a heat-exchanger network (HEN) which can be integrated with an organic Rankine cycle (ORC) for the recovery of low-grade waste heat from the heat surplus zone of the background process. An ORC-incorporated stagewise superstructure considering all possible heat-exchange matches between process Hot/cold streams and the ORC is first presented. On the basis of this superstructure, the model for synthesizing ORC-integrated HENs is formulated as a mixed-integer nonlinear program (MINLP). A two-step solution procedure is proposed to solve the MINLP model. First, a stand-alone HEN is synthesized to minimize the external Utility consumption. An ORC is then incorporated into the HEN with the objective of maximizing the work produced from waste heat (in the heat surplus zone below the process pinch) without increasing the use of a Hot Utility. A literature example is solved to demonstrate the application of the proposed model for industrial waste...

  • heat exchanger network synthesis involving organic rankine cycle for waste heat recovery
    Industrial & Engineering Chemistry Research, 2014
    Co-Authors: Cheng-liang Chen, Tzu-hsiang Chao, Feng-yi Chang, Hui-chu Chen
    Abstract:

    This article aims to present a mathematical model for the synthesis of a heat-exchanger network (HEN) which can be integrated with an organic Rankine cycle (ORC) for the recovery of low-grade waste heat from the heat surplus zone of the background process. An ORC-incorporated stagewise superstructure considering all possible heat-exchange matches between process Hot/cold streams and the ORC is first presented. On the basis of this superstructure, the model for synthesizing ORC-integrated HENs is formulated as a mixed-integer nonlinear program (MINLP). A two-step solution procedure is proposed to solve the MINLP model. First, a stand-alone HEN is synthesized to minimize the external Utility consumption. An ORC is then incorporated into the HEN with the objective of maximizing the work produced from waste heat (in the heat surplus zone below the process pinch) without increasing the use of a Hot Utility. A literature example is solved to demonstrate the application of the proposed model for industrial waste...

Paul Stuart - One of the best experts on this subject based on the ideXlab platform.

  • comparison between pinch analysis and bridge analysis to retrofit the heat exchanger network of a kraft pulp mill
    Applied Thermal Engineering, 2014
    Co-Authors: Jeanchristophe Bonhivers, Elin Svensson, Thore Berntsson, Paul Stuart
    Abstract:

    Pinch analysis is based on the Hot, cold and grand composite curves and is the most commonly-used approach to identify strategies for reducing energy consumption by heat exchanger network retrofit. This method was originally developed for the synthesis of new networks, and there remain certain difficulties for its application to improve existing networks. The advanced composite curves have been developed for retrofit situations specifically, and use data about existing heat exchangers to provide more information about the modifications necessary to achieve heat savings. Bridge analysis, which is based on the energy transfer diagram, is a new method and enumerates the sets of heat transfer modifications necessary to save energy. In this paper, the grand composite curve, the advanced composite curves and the energy transfer diagram have been constructed for analysis of the heat exchanger network of a kraft pulp mill. Links between these methods are made explicit; then results are discussed and compared. It is shown that the information provided by these approaches is consistent; however, the level of detail progressively increases from the grand composite curve to the advanced composite curves until the energy transfer diagram. Fundamentally, reducing the energy consumption implies decreasing the flow rate of heat cascaded through the network from the Hot Utility until the environment. As a consequence, any heat savings solution includes network modifications bridging coolers to heaters. Traditional pinch analysis does not provide information about the network modifications required after removal of cross-pinch transfers, while the advanced composite curves indicate the heat savings potential attainable through modifications of few existing heat exchanger units. Bridge analysis provides more detail about heat savings modifications, which bridge existing heaters and coolers, than traditional pinch analysis and the advanced composite curves do.