The Experts below are selected from a list of 7431 Experts worldwide ranked by ideXlab platform

Jiří Jaromír Klemeš - One of the best experts on this subject based on the ideXlab platform.

  • Optimal heat exchanger network synthesis with operability and safety considerations
    Clean Technologies and Environmental Policy, 2016
    Co-Authors: Ainur Munirah Hafizan, Sharifah Rafidah Wan Alwi, Zainuddin Abd Manan, Jiří Jaromír Klemeš
    Abstract:

    Research on the optimal design of heat exchanger networks (HENs) has primarily revolved around trading off technical design requirements for aspects of economy, such as capital cost of heat exchangers and utilities. As a result, considerations for safety, operability, and flexibility have received much less attention. This study presents a Pinch Analysis-based methodology that considers the inherent safety and operability aspects of an optimal HEN design. The procedure begins with data extraction, followed by utility targeting that gives due consideration to how each process stream impacts the inherent safety of the HEN. This is made possible via the use of a hot and cold Stream Temperature versus Enthalpy Plot (STEP) that prioritises the inherent safety Index (ISI) on top of the heat capacity flow rate (CPs) during simultaneous targeting and design of the HEN. The Pinch temperatures and minimum utilities were determined using STEP. At the same time, the hot and cold stream pairs with higher ISIs and those with lower ISIs were matched together so that safety considerations could be emphasised and precautions taken with a particular heat exchanger. The disturbance propagation path through the HEN and the affected streams were also analysed. Network modification was performed using the downstream path concept in order to reduce disturbance propagation downstream of the HEN. The ∆ T _min violations and energy penalties from network changes were assessed. Flexibility and structural Controllability of each network option were compared. The highest percentage of change in every stream of the network indicates that network is the most flexible, while the Index of structural Controllability closest to 1 demonstrates that the network is most controllable. Application of this method within an illustrative case study showed that network 3 was the most flexible as it yielded the highest percentage of change at 22 %. It was also the most controllable as it had a Controllability Index closest to 1.0, i.e. at 0.917.

Ainur Munirah Hafizan - One of the best experts on this subject based on the ideXlab platform.

  • Optimal heat exchanger network synthesis with operability and safety considerations
    Clean Technologies and Environmental Policy, 2016
    Co-Authors: Ainur Munirah Hafizan, Sharifah Rafidah Wan Alwi, Zainuddin Abd Manan, Jiří Jaromír Klemeš
    Abstract:

    Research on the optimal design of heat exchanger networks (HENs) has primarily revolved around trading off technical design requirements for aspects of economy, such as capital cost of heat exchangers and utilities. As a result, considerations for safety, operability, and flexibility have received much less attention. This study presents a Pinch Analysis-based methodology that considers the inherent safety and operability aspects of an optimal HEN design. The procedure begins with data extraction, followed by utility targeting that gives due consideration to how each process stream impacts the inherent safety of the HEN. This is made possible via the use of a hot and cold Stream Temperature versus Enthalpy Plot (STEP) that prioritises the inherent safety Index (ISI) on top of the heat capacity flow rate (CPs) during simultaneous targeting and design of the HEN. The Pinch temperatures and minimum utilities were determined using STEP. At the same time, the hot and cold stream pairs with higher ISIs and those with lower ISIs were matched together so that safety considerations could be emphasised and precautions taken with a particular heat exchanger. The disturbance propagation path through the HEN and the affected streams were also analysed. Network modification was performed using the downstream path concept in order to reduce disturbance propagation downstream of the HEN. The ∆ T _min violations and energy penalties from network changes were assessed. Flexibility and structural Controllability of each network option were compared. The highest percentage of change in every stream of the network indicates that network is the most flexible, while the Index of structural Controllability closest to 1 demonstrates that the network is most controllable. Application of this method within an illustrative case study showed that network 3 was the most flexible as it yielded the highest percentage of change at 22 %. It was also the most controllable as it had a Controllability Index closest to 1.0, i.e. at 0.917.

Zainuddin Abd Manan - One of the best experts on this subject based on the ideXlab platform.

  • Optimal heat exchanger network synthesis with operability and safety considerations
    Clean Technologies and Environmental Policy, 2016
    Co-Authors: Ainur Munirah Hafizan, Sharifah Rafidah Wan Alwi, Zainuddin Abd Manan, Jiří Jaromír Klemeš
    Abstract:

    Research on the optimal design of heat exchanger networks (HENs) has primarily revolved around trading off technical design requirements for aspects of economy, such as capital cost of heat exchangers and utilities. As a result, considerations for safety, operability, and flexibility have received much less attention. This study presents a Pinch Analysis-based methodology that considers the inherent safety and operability aspects of an optimal HEN design. The procedure begins with data extraction, followed by utility targeting that gives due consideration to how each process stream impacts the inherent safety of the HEN. This is made possible via the use of a hot and cold Stream Temperature versus Enthalpy Plot (STEP) that prioritises the inherent safety Index (ISI) on top of the heat capacity flow rate (CPs) during simultaneous targeting and design of the HEN. The Pinch temperatures and minimum utilities were determined using STEP. At the same time, the hot and cold stream pairs with higher ISIs and those with lower ISIs were matched together so that safety considerations could be emphasised and precautions taken with a particular heat exchanger. The disturbance propagation path through the HEN and the affected streams were also analysed. Network modification was performed using the downstream path concept in order to reduce disturbance propagation downstream of the HEN. The ∆ T _min violations and energy penalties from network changes were assessed. Flexibility and structural Controllability of each network option were compared. The highest percentage of change in every stream of the network indicates that network is the most flexible, while the Index of structural Controllability closest to 1 demonstrates that the network is most controllable. Application of this method within an illustrative case study showed that network 3 was the most flexible as it yielded the highest percentage of change at 22 %. It was also the most controllable as it had a Controllability Index closest to 1.0, i.e. at 0.917.

Sharifah Rafidah Wan Alwi - One of the best experts on this subject based on the ideXlab platform.

  • Optimal heat exchanger network synthesis with operability and safety considerations
    Clean Technologies and Environmental Policy, 2016
    Co-Authors: Ainur Munirah Hafizan, Sharifah Rafidah Wan Alwi, Zainuddin Abd Manan, Jiří Jaromír Klemeš
    Abstract:

    Research on the optimal design of heat exchanger networks (HENs) has primarily revolved around trading off technical design requirements for aspects of economy, such as capital cost of heat exchangers and utilities. As a result, considerations for safety, operability, and flexibility have received much less attention. This study presents a Pinch Analysis-based methodology that considers the inherent safety and operability aspects of an optimal HEN design. The procedure begins with data extraction, followed by utility targeting that gives due consideration to how each process stream impacts the inherent safety of the HEN. This is made possible via the use of a hot and cold Stream Temperature versus Enthalpy Plot (STEP) that prioritises the inherent safety Index (ISI) on top of the heat capacity flow rate (CPs) during simultaneous targeting and design of the HEN. The Pinch temperatures and minimum utilities were determined using STEP. At the same time, the hot and cold stream pairs with higher ISIs and those with lower ISIs were matched together so that safety considerations could be emphasised and precautions taken with a particular heat exchanger. The disturbance propagation path through the HEN and the affected streams were also analysed. Network modification was performed using the downstream path concept in order to reduce disturbance propagation downstream of the HEN. The ∆ T _min violations and energy penalties from network changes were assessed. Flexibility and structural Controllability of each network option were compared. The highest percentage of change in every stream of the network indicates that network is the most flexible, while the Index of structural Controllability closest to 1 demonstrates that the network is most controllable. Application of this method within an illustrative case study showed that network 3 was the most flexible as it yielded the highest percentage of change at 22 %. It was also the most controllable as it had a Controllability Index closest to 1.0, i.e. at 0.917.

Shi You - One of the best experts on this subject based on the ideXlab platform.

  • Controllability and stability of primary frequency control from thermostatic loads with delays
    Journal of Modern Power Systems and Clean Energy, 2017
    Co-Authors: Charalampos Ziras, Evangelos Vrettos, Shi You
    Abstract:

    There is an increasing interest in exploiting the flexibility of loads to provide ancillary services to the grid. In this paper we study how response delays and lockout constraints affect the Controllability of an aggregation of refrigerators offering primary frequency control (PFC). First we examine the effect of delays in PFC provision from an aggregation of refrigerators, using a two-area power system. We propose a framework to systematically address frequency measurement and response delays and we determine safe values for the total delays via simulations. We introduce a Controllability Index to evaluate PFC provision under lockout constraints of refrigerators compressors. We conduct extensive simulations to study the effects of measurement delay, ramping times, lockout durations and rotational inertia on the Controllability of the aggregation and system stability. Finally, we discuss solutions for offering reliable PFC provision from thermostatically controlled loads under lockout constraints and we propose a supervisory control to enhance the robustness of their controllers.