title: Critical analysis of process integration options for joule-cycle and conventional heat pumps

authors: Gai, Limei

abstract: To date, research on heat pumps (HP) has mainly focused on vapour compression heat pumps (VCHP), transcritical heat pumps (TCHP), absorption heat pumps, and their heat integration with processes. Few studies have considered the Joule cycle heat pump (JCHP), which raises several questions. What are the characteristics and specifics of these different heat pumps? How are they different when they integrate with the processes? For different processes, which heat pump is more appropriate? To address these questions, the performance and integration of different types of heat pumps with various processes have been studied through Pinch Methodology. The results show that different heat pumps have their own optimal application range. The new JCHP is suitable for processes in which the temperature changes of source and sink are both massive. The VCHP is more suitable for the source and sink temperatures, which are near-constant. The TCHP is more suitable for sources with small temperature changes and sinks with large temperature changes. This study develops an approach that provides guidance for the selection of heat pumps by applying Process Integration to various combinations of heat pump types and processes. It is shown that the correct choice of heat pump type for each application is of utmost importance, as the Coefficient of Performance can be improved by up to an order of magnitude. By recovering and upgrading process waste heat, heat pumps can save 15-78% of the hot utility depending on the specific process.

text: Critical analysis of process integration options for joule-cycle and conventional heat pumps To date, research on heat pumps (HP) has mainly focused on vapour compression heat pumps (VCHP), transcritical heat pumps (TCHP), absorption heat pumps, and their heat integration with processes. Few studies have considered the Joule cycle heat pump (JCHP), which raises several questions. What are the characteristics and specifics of these different heat pumps? How are they different when they integrate with the processes? For different processes, which heat pump is more appropriate? To address these questions, the performance and integration of different types of heat pumps with various processes have been studied through Pinch Methodology. The results show that different heat pumps have their own optimal application range. The new JCHP is suitable for processes in which the temperature changes of source and sink are both massive. The VCHP is more suitable for the source and sink temperatures, which are near-constant. The TCHP is more suitable for sources with small temperature changes and sinks with large temperature changes. This study develops an approach that provides guidance for the selection of heat pumps by applying Process Integration to various combinations of heat pump types and processes. It is shown that the correct choice of heat pump type for each application is of utmost importance, as the Coefficient of Performance can be improved by up to an order of magnitude. By recovering and upgrading process waste heat, heat pumps can save 15-78% of the hot utility depending on the specific process.

year: 2020

title: Transcending the personal and political: Provocations

authors: Morrison, Michele

abstract: Each case study in this book stands alone. The leaders portrayed in these narratives, and the authors who collaborated with them in the re-storying of their lived experience, bring unique worldviews and particular theoretical lenses to bear. le is appropriate chat readers should do the same. In this concluding chapter we seek not to prescribe meaning nor constrain interpretation but to highlight three emerging themes: complexity, agency, and action. Rather than summarise each case we select examples that evoke and illustrate the points we wish co make. We consider the implications of complexity, agency, and action for practitioners, policy makers, and the education profession (pre- and in-service). Finally, we conclude with a series of provocations that we hope will ignite passionate debate, professional commitment, and the political will necessary co reach national consensus over what we mean by social justice and how we best go about achieving this.

text: Transcending the personal and political: Provocations Each case study in this book stands alone. The leaders portrayed in these narratives, and the authors who collaborated with them in the re-storying of their lived experience, bring unique worldviews and particular theoretical lenses to bear. le is appropriate chat readers should do the same. In this concluding chapter we seek not to prescribe meaning nor constrain interpretation but to highlight three emerging themes: complexity, agency, and action. Rather than summarise each case we select examples that evoke and illustrate the points we wish co make. We consider the implications of complexity, agency, and action for practitioners, policy makers, and the education profession (pre- and in-service). Finally, we conclude with a series of provocations that we hope will ignite passionate debate, professional commitment, and the political will necessary co reach national consensus over what we mean by social justice and how we best go about achieving this.

year: 2017

title: Waiwharangi

authors: Maxwell, Te Kahautu

abstract: Haka. Lyrics/Musical score composed by Te Kahautu Maxwell. Performed by Ōpōtiki Mai Tawhiti (Kapa Haka group) (4mins)

Waiata: Tira Aroha
Whakaeke: Haere mai rā
Mōteatea: Te Pātere a Te Turuki
Poi: Iarararararī
Waiata ā ringa: Taku Mana Māori Motuhake
Haka: Waiwharangi
Whakawātea: Āio

text: Waiwharangi Haka. Lyrics/Musical score composed by Te Kahautu Maxwell. Performed by Ōpōtiki Mai Tawhiti (Kapa Haka group) (4mins)

Waiata: Tira Aroha
Whakaeke: Haere mai rā
Mōteatea: Te Pātere a Te Turuki
Poi: Iarararararī
Waiata ā ringa: Taku Mana Māori Motuhake
Haka: Waiwharangi
Whakawātea: Āio

year: 2020-02-06