title: Heat pump bridge analysis using the modified energy transfer diagram

authors: Schlosser, Florian

subjects: Science & Technology

abstract: Heat pumps are the key technology to decarbonise thermal processes by upgrading industrial surplus heat using renewable electricity. Existing insight-based integration methods refer to the idealised Grand Composite Curve requiring the full exploitation of heat recovery potential but leave the question of how to deal with technical or economic limitations unanswered. In this work, a novel Heat Pump Bridge Analysis (HPBA) is introduced for practically targeting technical and economic heat pump potential by applying Coefficient of Performance curves into the Modified Energy Transfer Diagram (METD). Removing cross-Pinch violations and operating heat exchangers at minimum approach temperatures by combined application of Bridge Analysis increases the heat recovery rate and reduce the temperature lift to be pumped at the same time. The insight-based METD allows the individual matching of heat surpluses and deficits of individual streams with the capabilities and performance of different market-available heat pump concepts. For an illustrative example, the presented modifications based on HPBA increase the economically viable share of the technical heat pump potential from 61% to 79%.

text: Heat pump bridge analysis using the modified energy transfer diagram Heat pumps are the key technology to decarbonise thermal processes by upgrading industrial surplus heat using renewable electricity. Existing insight-based integration methods refer to the idealised Grand Composite Curve requiring the full exploitation of heat recovery potential but leave the question of how to deal with technical or economic limitations unanswered. In this work, a novel Heat Pump Bridge Analysis (HPBA) is introduced for practically targeting technical and economic heat pump potential by applying Coefficient of Performance curves into the Modified Energy Transfer Diagram (METD). Removing cross-Pinch violations and operating heat exchangers at minimum approach temperatures by combined application of Bridge Analysis increases the heat recovery rate and reduce the temperature lift to be pumped at the same time. The insight-based METD allows the individual matching of heat surpluses and deficits of individual streams with the capabilities and performance of different market-available heat pump concepts. For an illustrative example, the presented modifications based on HPBA increase the economically viable share of the technical heat pump potential from 61% to 79%.

year: 2021

title: Auditing improvements in a product delivery process (AIPDP)

authors: Childerhouse, Paul

subjects: auditing

abstract: Purpose – The purpose of this paper is to assess the appropriateness of using the 12 previously published material flow simplicity rules (SRs) to shape the successful design and implementation of improvements in a casting company product delivery process (PDP).
Design/methodology/approach – The business process improvement (BPI) project described in this case study was actively supported by the UK knowledge transfer partnership initiative. Hence, the outcome in terms of gain in the key performance indicators has been subjected to close and independent scrutiny. The dynamics of process change observed (and displayed on the factory floor) can thereby be exploited as signatures showing actual rates of improvement. It is then straightforward to highlight the qualitative impact of SR relevance to the likely outcomes.
Findings – The 12 SRs were originally posited based on published research (particularly by Jay Forrester and Jack Burbidge) and many others. This case study independently tests their detailed application in one specific environment.
Research limitations/implications – None emerged during this case study. Other investigations may subsequently lead to prioritisation of the rules.
Practical implications – On this evidence the 12 material flow SRs are directly relevant and highly effective in the planning and execution of industrial PDP improvement programmes. They provide structure and build confidence during execution of this important task.
Originality/value – The paper has originality and values primarily due to new proven application of a recent published technique for BPI auditing.

text: Auditing improvements in a product delivery process (AIPDP) Purpose – The purpose of this paper is to assess the appropriateness of using the 12 previously published material flow simplicity rules (SRs) to shape the successful design and implementation of improvements in a casting company product delivery process (PDP).
Design/methodology/approach – The business process improvement (BPI) project described in this case study was actively supported by the UK knowledge transfer partnership initiative. Hence, the outcome in terms of gain in the key performance indicators has been subjected to close and independent scrutiny. The dynamics of process change observed (and displayed on the factory floor) can thereby be exploited as signatures showing actual rates of improvement. It is then straightforward to highlight the qualitative impact of SR relevance to the likely outcomes.
Findings – The 12 SRs were originally posited based on published research (particularly by Jay Forrester and Jack Burbidge) and many others. This case study independently tests their detailed application in one specific environment.
Research limitations/implications – None emerged during this case study. Other investigations may subsequently lead to prioritisation of the rules.
Practical implications – On this evidence the 12 material flow SRs are directly relevant and highly effective in the planning and execution of industrial PDP improvement programmes. They provide structure and build confidence during execution of this important task.
Originality/value – The paper has originality and values primarily due to new proven application of a recent published technique for BPI auditing.

year: 2010

title: Māori medium children’s views about learning mathematics: possibilities for future directions

authors: Hāwera, Ngārewa

subjects: New Zealand

abstract: Pre-European traditional Māori education in New Zealand was integrated and holistic. With Western influence many Maori children struggled to achieve at school. Māori medium education based on retaining Māori values, language and culture therefore emerged to provide an alternative avenue for education. A key element in this initiative is to increase children’s engagement with, and learning of, mathematics. Views from 61 Year 5-8 children in Māori medium contexts have been sought to provide insights about their mathematics education. This paper discusses some of these views and raises possibilities for future directions to support the momentum of this positive initiative.

text: Māori medium children’s views about learning mathematics: possibilities for future directions Pre-European traditional Māori education in New Zealand was integrated and holistic. With Western influence many Maori children struggled to achieve at school. Māori medium education based on retaining Māori values, language and culture therefore emerged to provide an alternative avenue for education. A key element in this initiative is to increase children’s engagement with, and learning of, mathematics. Views from 61 Year 5-8 children in Māori medium contexts have been sought to provide insights about their mathematics education. This paper discusses some of these views and raises possibilities for future directions to support the momentum of this positive initiative.

year: 2011