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

  • new analysis method to reduce the industrial energy requirements by heat exchanger network retrofit part 1 concepts
    Applied Thermal Engineering, 2017
    Co-Authors: Jeanchristophe Bonhivers, Balasubrahmanyan Srinivasan, Paul Stuart
    Abstract:

    Abstract Energy savings in existing plants usually have positive economic and environmental impacts. Mathematical approaches to heat-exchanger network (HEN) retrofit are complex and do not guarantee identification of the global optimum. Thanks to its simplicity the pinch-based approach is widely used, even though difficulties for its adaption to HEN retrofit are encountered. This paper presents the concepts supporting a new analysis method for HEN retrofit. Energy is conserved and degraded through heat exchanges and process operations. Reducing heat consumption implies a reduction in the flow rate of heat transferred from the Heating Utility through the existing heat exchanger network until rejected to the environment. This progressive transfer of heat in the existing heat exchanges from the Heating Utility to the environment is not explicitly analyzed in the present approaches for HEN retrofit. For the first time, the set of modifications necessary to reduce the heat consumption is made explicit; this set is represented by a “bridge”. An energy transfer diagram to identify bridges and a network table to easily identify and evaluate bridges are proposed. A method to enumerate the bridges is described. The principle of bridge improves the comprehension about the problem of HEN retrofit, and its application results in a significant search space reduction; this reduction is all the more so useful since this problem is non-deterministic polynomial-time hard. A global procedure for HEN retrofit and case studies are presented in a second paper.

  • new analysis method to reduce the industrial energy requirements by heat exchanger network retrofit part 1 concepts
    Applied Thermal Engineering, 2017
    Co-Authors: Jeanchristophe Bonhivers, Balasubrahmanyan Srinivasan, Paul Stuart
    Abstract:

    Abstract Energy savings in existing plants usually have positive economic and environmental impacts. Mathematical approaches to heat-exchanger network (HEN) retrofit are complex and do not guarantee identification of the global optimum. Thanks to its simplicity the pinch-based approach is widely used, even though difficulties for its adaption to HEN retrofit are encountered. This paper presents the concepts supporting a new analysis method for HEN retrofit. Energy is conserved and degraded through heat exchanges and process operations. Reducing heat consumption implies a reduction in the flow rate of heat transferred from the Heating Utility through the existing heat exchanger network until rejected to the environment. This progressive transfer of heat in the existing heat exchanges from the Heating Utility to the environment is not explicitly analyzed in the present approaches for HEN retrofit. For the first time, the set of modifications necessary to reduce the heat consumption is made explicit; this set is represented by a “bridge”. An energy transfer diagram to identify bridges and a network table to easily identify and evaluate bridges are proposed. A method to enumerate the bridges is described. The principle of bridge improves the comprehension about the problem of HEN retrofit, and its application results in a significant search space reduction; this reduction is all the more so useful since this problem is non-deterministic polynomial-time hard. A global procedure for HEN retrofit and case studies are presented in a second paper.

Jeanchristophe Bonhivers - One of the best experts on this subject based on the ideXlab platform.

  • new analysis method to reduce the industrial energy requirements by heat exchanger network retrofit part 1 concepts
    Applied Thermal Engineering, 2017
    Co-Authors: Jeanchristophe Bonhivers, Balasubrahmanyan Srinivasan, Paul Stuart
    Abstract:

    Abstract Energy savings in existing plants usually have positive economic and environmental impacts. Mathematical approaches to heat-exchanger network (HEN) retrofit are complex and do not guarantee identification of the global optimum. Thanks to its simplicity the pinch-based approach is widely used, even though difficulties for its adaption to HEN retrofit are encountered. This paper presents the concepts supporting a new analysis method for HEN retrofit. Energy is conserved and degraded through heat exchanges and process operations. Reducing heat consumption implies a reduction in the flow rate of heat transferred from the Heating Utility through the existing heat exchanger network until rejected to the environment. This progressive transfer of heat in the existing heat exchanges from the Heating Utility to the environment is not explicitly analyzed in the present approaches for HEN retrofit. For the first time, the set of modifications necessary to reduce the heat consumption is made explicit; this set is represented by a “bridge”. An energy transfer diagram to identify bridges and a network table to easily identify and evaluate bridges are proposed. A method to enumerate the bridges is described. The principle of bridge improves the comprehension about the problem of HEN retrofit, and its application results in a significant search space reduction; this reduction is all the more so useful since this problem is non-deterministic polynomial-time hard. A global procedure for HEN retrofit and case studies are presented in a second paper.

  • new analysis method to reduce the industrial energy requirements by heat exchanger network retrofit part 1 concepts
    Applied Thermal Engineering, 2017
    Co-Authors: Jeanchristophe Bonhivers, Balasubrahmanyan Srinivasan, Paul Stuart
    Abstract:

    Abstract Energy savings in existing plants usually have positive economic and environmental impacts. Mathematical approaches to heat-exchanger network (HEN) retrofit are complex and do not guarantee identification of the global optimum. Thanks to its simplicity the pinch-based approach is widely used, even though difficulties for its adaption to HEN retrofit are encountered. This paper presents the concepts supporting a new analysis method for HEN retrofit. Energy is conserved and degraded through heat exchanges and process operations. Reducing heat consumption implies a reduction in the flow rate of heat transferred from the Heating Utility through the existing heat exchanger network until rejected to the environment. This progressive transfer of heat in the existing heat exchanges from the Heating Utility to the environment is not explicitly analyzed in the present approaches for HEN retrofit. For the first time, the set of modifications necessary to reduce the heat consumption is made explicit; this set is represented by a “bridge”. An energy transfer diagram to identify bridges and a network table to easily identify and evaluate bridges are proposed. A method to enumerate the bridges is described. The principle of bridge improves the comprehension about the problem of HEN retrofit, and its application results in a significant search space reduction; this reduction is all the more so useful since this problem is non-deterministic polynomial-time hard. A global procedure for HEN retrofit and case studies are presented in a second paper.

Barbara Sturm - One of the best experts on this subject based on the ideXlab platform.

  • process intensification and integration of solar heat generation in the chinese condiment sector a case study of a medium sized beijing based factory
    Energy Conversion and Management, 2015
    Co-Authors: Barbara Sturm, Steven Meyers, Yongjie Zhang, Richard Law, Eric Siqueiros J Valencia, Huashan Bao, Yaodong Wang, Haisheng Chen
    Abstract:

    Abstract Over the last decade, energy prices in China have risen dramatically. At the same time, extensive use of coal fired energy provision systems in industry has led to serious environmental and economic problems translating to an economic damage of an estimated 10% of the Gross Domestic Product. This has led to increasing awareness in the process industries of the need to save energy whilst replacing conventional energy sources with renewable ones. An energy audit was conducted for a soy sauce production facility in Beijing, which aimed to reduce its thermal energy demand through process intensification and to integrate renewable energy. Their current supply of thermal energy came directly from a district steam network, which was both directly consumed and downgraded via heat exchangers. It was determined that the best two solar integration locations would be in the pre-Heating/mixing of raw ingredients to 60 °C and the subsequent direct steaming of the mixture to 120 °C. Three different systems for supplementing steam were investigated: (1) a traditional solar thermal Heating system; (2) a system consisting of mono crystalline photovoltaic panels coupled with either a resistance heater or electric steam generator; and (3) a cascading system consisting of two types of solar thermal collectors, photovoltaic panels, and an electric steam generator. Comparisons of systems 1 and 2 were made for the Heating of mixing water, and systems 1, 2, and 3 for saturated steam generation. Results showed that for the Heating of process water, flat plate solar collectors performed best with an estimated 20 year Levelised Cost of Energy of 0.063 €/kW h. Steam generation was most cost effective with a cascade system of photovoltaic and flat plate collectors, with an estimated 20 year Levelised Cost of Energy of 0.145 €/kW h. The model predicts that integration of this technology would lead to a reduction of 14% in Heating Utility demand.

Balasubrahmanyan Srinivasan - One of the best experts on this subject based on the ideXlab platform.

  • new analysis method to reduce the industrial energy requirements by heat exchanger network retrofit part 1 concepts
    Applied Thermal Engineering, 2017
    Co-Authors: Jeanchristophe Bonhivers, Balasubrahmanyan Srinivasan, Paul Stuart
    Abstract:

    Abstract Energy savings in existing plants usually have positive economic and environmental impacts. Mathematical approaches to heat-exchanger network (HEN) retrofit are complex and do not guarantee identification of the global optimum. Thanks to its simplicity the pinch-based approach is widely used, even though difficulties for its adaption to HEN retrofit are encountered. This paper presents the concepts supporting a new analysis method for HEN retrofit. Energy is conserved and degraded through heat exchanges and process operations. Reducing heat consumption implies a reduction in the flow rate of heat transferred from the Heating Utility through the existing heat exchanger network until rejected to the environment. This progressive transfer of heat in the existing heat exchanges from the Heating Utility to the environment is not explicitly analyzed in the present approaches for HEN retrofit. For the first time, the set of modifications necessary to reduce the heat consumption is made explicit; this set is represented by a “bridge”. An energy transfer diagram to identify bridges and a network table to easily identify and evaluate bridges are proposed. A method to enumerate the bridges is described. The principle of bridge improves the comprehension about the problem of HEN retrofit, and its application results in a significant search space reduction; this reduction is all the more so useful since this problem is non-deterministic polynomial-time hard. A global procedure for HEN retrofit and case studies are presented in a second paper.

  • new analysis method to reduce the industrial energy requirements by heat exchanger network retrofit part 1 concepts
    Applied Thermal Engineering, 2017
    Co-Authors: Jeanchristophe Bonhivers, Balasubrahmanyan Srinivasan, Paul Stuart
    Abstract:

    Abstract Energy savings in existing plants usually have positive economic and environmental impacts. Mathematical approaches to heat-exchanger network (HEN) retrofit are complex and do not guarantee identification of the global optimum. Thanks to its simplicity the pinch-based approach is widely used, even though difficulties for its adaption to HEN retrofit are encountered. This paper presents the concepts supporting a new analysis method for HEN retrofit. Energy is conserved and degraded through heat exchanges and process operations. Reducing heat consumption implies a reduction in the flow rate of heat transferred from the Heating Utility through the existing heat exchanger network until rejected to the environment. This progressive transfer of heat in the existing heat exchanges from the Heating Utility to the environment is not explicitly analyzed in the present approaches for HEN retrofit. For the first time, the set of modifications necessary to reduce the heat consumption is made explicit; this set is represented by a “bridge”. An energy transfer diagram to identify bridges and a network table to easily identify and evaluate bridges are proposed. A method to enumerate the bridges is described. The principle of bridge improves the comprehension about the problem of HEN retrofit, and its application results in a significant search space reduction; this reduction is all the more so useful since this problem is non-deterministic polynomial-time hard. A global procedure for HEN retrofit and case studies are presented in a second paper.

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

  • process intensification and integration of solar heat generation in the chinese condiment sector a case study of a medium sized beijing based factory
    Energy Conversion and Management, 2015
    Co-Authors: Barbara Sturm, Steven Meyers, Yongjie Zhang, Richard Law, Eric Siqueiros J Valencia, Huashan Bao, Yaodong Wang, Haisheng Chen
    Abstract:

    Abstract Over the last decade, energy prices in China have risen dramatically. At the same time, extensive use of coal fired energy provision systems in industry has led to serious environmental and economic problems translating to an economic damage of an estimated 10% of the Gross Domestic Product. This has led to increasing awareness in the process industries of the need to save energy whilst replacing conventional energy sources with renewable ones. An energy audit was conducted for a soy sauce production facility in Beijing, which aimed to reduce its thermal energy demand through process intensification and to integrate renewable energy. Their current supply of thermal energy came directly from a district steam network, which was both directly consumed and downgraded via heat exchangers. It was determined that the best two solar integration locations would be in the pre-Heating/mixing of raw ingredients to 60 °C and the subsequent direct steaming of the mixture to 120 °C. Three different systems for supplementing steam were investigated: (1) a traditional solar thermal Heating system; (2) a system consisting of mono crystalline photovoltaic panels coupled with either a resistance heater or electric steam generator; and (3) a cascading system consisting of two types of solar thermal collectors, photovoltaic panels, and an electric steam generator. Comparisons of systems 1 and 2 were made for the Heating of mixing water, and systems 1, 2, and 3 for saturated steam generation. Results showed that for the Heating of process water, flat plate solar collectors performed best with an estimated 20 year Levelised Cost of Energy of 0.063 €/kW h. Steam generation was most cost effective with a cascade system of photovoltaic and flat plate collectors, with an estimated 20 year Levelised Cost of Energy of 0.145 €/kW h. The model predicts that integration of this technology would lead to a reduction of 14% in Heating Utility demand.