An introduction to heat transfer

Natural ventilation of buildings is the flow generated by temperature differences and by the wind. The governing feature of this flow is the exchange between an interior space and the external ambient. Although the wind may often appear to be the dominant driving mechanism, in many circumstances temperature variations play a controlling feature on the ventilation since the directional buoyancy force has a large influence on the flow patterns within the space and on the nature of the exchange with the outside. Two forms of ventilation are discussed: mixing ventilation, in which the interior is at an approximately uniform temperature, and displacement ventilation, where there is strong internal stratification. The dynamics of these buoyancy-driven flows are considered, and the effects of wind on them are examined. The aim behind this work is to give designers rules and intuition on how air moves within a building; the research reveals a fascinating branch of fluid mechanics.

The fluid mechanics of natural ventilation

Purpose - This paper aims to investigate the definition of Lean Production and the methods and goals associated with the concept as well as how it differs from other popular management concepts. Methodology/Approach - The paper is based on a review of the contemporary literature on Lean Production, both journal articles and books. Findings - It is shown in the paper that there is no consensus on a definition of Lean Production between the examined authors. The authors also seem to have different opinions on which characteristics that should be associated with the concept. Overall it can be concluded that Lean Production is not clearly defined in the reviewed literature. This divergence can cause some confusion on a theoretical level, but is probably more problematic on a practical level when organizations aim to implement the concept. This paper argues that it is important for an organization to acknowledge the different variations, and to raise the awareness of the input in the implementation process. It is further argued that the organization should not accept any random variant of Lean, but make active choices and adapt the concept to suit the organization-s needs. Through this process of adaptation, the organization will be able to increase the odds of performing a predictable and successful implementation. Originality/Value - This paper provides a critical perspective on the discourse surrounding Lean Production, and gives an input to the discussion of the implementation of management models. Keywords - Lean Production, Definition, Construct Validity, Total Quality Management Paper type - Conceptual paper

https://www.ep.liu.se/ecp/033/025/ecp0803325.pdf

Defining Lean Production : Some conceptual and practical issues

Most executives know that how they respond to the challenge of sustainability will profoundly affect the competitiveness—and perhaps even the survival—of their organizations. Yet most are flailing around, launching a hodgepodge o f initiatives without any over arching vision or plan. That’s not because they don’t s e e sustainability as a s t ra tegic issue. Rather, it’s because t h e y think t h e y ’ r e facing an unprecedented journey fo r which there is no road map. But there is a road map. Our research into the forces that have shaped the competitive landscape in recent decades reveals that ―business megatrends‖ have features and trajectories in common. Sustainability is an emerging megatrend, and thus its course is to some extent predictable. Understanding how firms won in prior megatrends can help executives craft the strategies and systems they’ll need to gain advantage in this one. The concept of megatrends is not new, of course. Businessman and author John Naisbitt popularized the term in his 1982 best seller of the same name, referring to incipient societal and economic shifts such as globalization, the rise of the information society, and the move from hierarchical organizations to networks. Our focus is on business megatrends, which force fundamental and persistent shifts in how companies compete. Such transformations arise from technological innovation or from new ways of doing business, and many factors can launch or magnify the process of change. Business megatrends may emerge from or be accelerated by financial crises, shifts in the social realities that define the marketplace, or the threat of conflict over resources. The geopolitics of the Cold War, for example, drove the innovations that launched both the space race and rapid developments in the field of microelectronics—ultimately unleashing the information technology megatrend. Electrification, the rise of mass production, and globalization were also megatrends, as was the quality movement of the 1970s and 1980s. The common thread among them is that they presented inescapable strategic imperatives for corporate leaders.

The Sustainability Imperative

Review of researches and developments on solar stills

The purpose of this study is to develop a structured hierarchical interrelationship-based model to evaluate the critical failure factors (CFFs) that affect the sustainable Lean Six Sigma (SLSS) framework implementation in a healthcare organization. Further, solution approaches have been provided that guide to eliminate them.,The CFFs has been identified through empirical study and clustered into six major categories for their better understanding. The interrelation among CFFs has been developed through total interpretive structural modeling (TISM) and classifies the nature using MICMAC technique. Further, prioritized the CFFs based on its driving and dependents power. The methodology enabled the decision-makers, practitioners to systematically analyze the CFFs and develop a structural model for implementing SLSS in the healthcare environment.,A total of 14 leading CFFs have been identified, and 7-level structured interrelationship-based model has been formed. The experts have provided the solution approach after careful analysis of the developed model. Based on the analysis, it was observed that the significant CFFs affect the deployment of the SLSS framework in healthcare organizations.,The structured model and methodological approach have been tested in a healthcare organization. In the future, the approach can be applied in the different service sectors.,The present study has been conducted in a real-time industrial problem. The practitioners, decision-makers and academicians expressed the usefulness of methodology for understanding the CFFs interrelation and their effect on SLSS implementation. This study also guides decision-makers to systematically tackle related problems.,The development of a structured CFFs based model for SLSS framework implementation using the integrated TISM-MICMAC with a detailed solution approach is a unique effort in a healthcare environment.

Evaluating the effect of critical failure factors associated with sustainable Lean Six Sigma framework implementation in healthcare organization

Effect of lean six sigma on firm performance: A case of Indian automotive component manufacturing organization

Mathematical modeling and evaluation of new long single slope still for utilization of hot wastewater

Manufacturing organizations continually adopt quality improvement strategy to gain competitive edge in current competitive market and fulfill the customers demand. Lean approach and Six Sigma approach are two quality improvement tools extensively used to improve quality and bottom line result. Lean manufacturing generally used to eliminate waste and Six Sigma approach used for reducing the defects in manufacturing process by eliminating the process variation with help of statistical tools and techniques. The objective of this study is to recognize the importance of Lean Six Sigma CSFs for implementing Lean Six Sigma strategy into manufacturing organization. Further the Interpretative Structural Modelling (ISM) approach used for establishing the connection between the identified CSFs and establish them in different level of hierarchy. The organized level of CSFs helps to adopt CSFs during LSS framework implementation process. This study will help both academician and professionals to explore CSFs for successful implementation of Lean Six Sigma framework in their organization.

Anil Kr. Tiwari

Papers

Evaluating the effect of critical failure factors associated with sustainable Lean Six Sigma framework implementation in healthcare organization

Effect of lean six sigma on firm performance: A case of Indian automotive component manufacturing organization

Mathematical modeling and evaluation of new long single slope still for utilization of hot wastewater

Evaluating importance of critical success factors in successful implementation of Lean Six Sigma framework

Evaluation of key performance indicators for sustainability assessment in automotive component manufacturing organization