title: Optimisation of non-isothermal utilities using the Unified Total Site Heat Integration method

authors: Tarighaleslami, Amir Hossein

abstract: Total Site Heat Integration is an effective method for design of large scale utility systems that serve large chemical processes, such as refineries, petrochemicals or even lower temperature chemical and process plants. Total Site Heat Integration of different chemical plants might confront batch, semi-continuous or continuous plants which are clustered into one large site. Excess heat produced from one plant could be transferred to other plants using an intermediate fluid. In this paper, Total Site optimisation of targeting utility generation and consumption for lower temperature processes, which mainly use non-isothermal utilities, is presented. The utility temperature selection optimisation applies to the recently developed Unified Total Site Heat Integration Targeting (UTST) method. The new method shows that, for low temperature processes where non-isothermal utilities are used, the supply and target temperatures of a utility is an important constraint, while for higher temperature processes, where isothermal utilities are applied, no significant change in targets from conventional Total Site are obtained. New heuristics based on UTST method with respect to non-isothermal utility temperature selection are proposed. A Kraft Pulp Mill case study has been investigated in this research, using optimised non isothermal utilities, showing a 3.6 MW increase in heat recovery, 0.87 MW decrease in shaft work generation, and $ 330,000 /y utility cost saving in the system applying the new UTST method compared to the conventional Total Site method.

text: Optimisation of non-isothermal utilities using the Unified Total Site Heat Integration method Total Site Heat Integration is an effective method for design of large scale utility systems that serve large chemical processes, such as refineries, petrochemicals or even lower temperature chemical and process plants. Total Site Heat Integration of different chemical plants might confront batch, semi-continuous or continuous plants which are clustered into one large site. Excess heat produced from one plant could be transferred to other plants using an intermediate fluid. In this paper, Total Site optimisation of targeting utility generation and consumption for lower temperature processes, which mainly use non-isothermal utilities, is presented. The utility temperature selection optimisation applies to the recently developed Unified Total Site Heat Integration Targeting (UTST) method. The new method shows that, for low temperature processes where non-isothermal utilities are used, the supply and target temperatures of a utility is an important constraint, while for higher temperature processes, where isothermal utilities are applied, no significant change in targets from conventional Total Site are obtained. New heuristics based on UTST method with respect to non-isothermal utility temperature selection are proposed. A Kraft Pulp Mill case study has been investigated in this research, using optimised non isothermal utilities, showing a 3.6 MW increase in heat recovery, 0.87 MW decrease in shaft work generation, and $ 330,000 /y utility cost saving in the system applying the new UTST method compared to the conventional Total Site method.

year: 2016

title: BP’s use of posture to respond to the deepwater horizon crisis

authors: Goosen-Botes, Vida

subjects: legitimacy

abstract: This paper focuses on the posture the oil company BP adopted when faced with a legitimacy crisis during one of the worst environmental disasters in history. Against a backdrop of a discussion of the rhetorical aspects of image repair discourse and organisational legitimacy, Hearit’s strategy of corporate apologia was employed to determine the posture BP adopted in relation to the crisis. This paper adds to the literature on image repair strategies by heeding a call by Hearit for the context within which corporate apologia takes place to be taken account of, an approach that warrants a distinct line of research. The literature was further extended by complementing Hearit's strategy with semiotics and analysing its use in both the annual and sustainability reports. The additional focus on the sustainability reports is important, due to the high premium placed on sustainability in the changing business environment. On a practical level this paper contributes to an understanding of how organisations use sustainability reports to respond to legitimacy challenges.

text: BP’s use of posture to respond to the deepwater horizon crisis This paper focuses on the posture the oil company BP adopted when faced with a legitimacy crisis during one of the worst environmental disasters in history. Against a backdrop of a discussion of the rhetorical aspects of image repair discourse and organisational legitimacy, Hearit’s strategy of corporate apologia was employed to determine the posture BP adopted in relation to the crisis. This paper adds to the literature on image repair strategies by heeding a call by Hearit for the context within which corporate apologia takes place to be taken account of, an approach that warrants a distinct line of research. The literature was further extended by complementing Hearit's strategy with semiotics and analysing its use in both the annual and sustainability reports. The additional focus on the sustainability reports is important, due to the high premium placed on sustainability in the changing business environment. On a practical level this paper contributes to an understanding of how organisations use sustainability reports to respond to legitimacy challenges.

year: 2013

title: Can the mana of Maori men who sexually abuse children be restored?

authors: Webb, Mate

subjects: Maori

abstract: The problem of child sex abuse is prevalent across all segments of society, and Maori, unfortunately, are overrepresented in this problem. In the total prison population of 6591, 13.6% are identified as child sex offenders. Of the 3,299 Maori in prison 283 (8.5%) are identified as child sex offenders whereas 631 (18.6%) of the 3292 non-Maori have been so identified. However, Maori only represent approximately 15% of the general population. In proportionate terms, approximately one of every 970 Maori men is currently in prison for child sex offences, while for non-Maori that figure is one in 31251. Also, disclosures from offenders suggest that sexual abuse is particularly common in rural or disadvantaged areas, with offenders frequently reporting being abused by multiple offenders and being aware of chronic abuse, little of which was ever reported.

text: Can the mana of Maori men who sexually abuse children be restored? The problem of child sex abuse is prevalent across all segments of society, and Maori, unfortunately, are overrepresented in this problem. In the total prison population of 6591, 13.6% are identified as child sex offenders. Of the 3,299 Maori in prison 283 (8.5%) are identified as child sex offenders whereas 631 (18.6%) of the 3292 non-Maori have been so identified. However, Maori only represent approximately 15% of the general population. In proportionate terms, approximately one of every 970 Maori men is currently in prison for child sex offences, while for non-Maori that figure is one in 31251. Also, disclosures from offenders suggest that sexual abuse is particularly common in rural or disadvantaged areas, with offenders frequently reporting being abused by multiple offenders and being aware of chronic abuse, little of which was ever reported.

year: 2008