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  • About
  • The Global ETD Search service is a free service for researchers to find electronic theses and dissertations. This service is provided by the Networked Digital Library of Theses and Dissertations.
    Our metadata is collected from universities around the world. If you manage a university/consortium/country archive and want to be added, details can be found on the NDLTD website.
1

Modelling and control of crop production in horticultural greenhouses

Rothwell, John R. January 1999 (has links)
No description available.
2

Passive environmental control for museums in hot-humid climates : guidelines for building design and fabric improvements

Toledo, Franciza Lima January 1999 (has links)
No description available.
3

The optimization of ventilation and refrigeration in underground British coal mines

Anderson, J. M. January 1985 (has links)
No description available.
4

A spatial presence of thoughtfulness : Electrolux experience

Oscarsson, Joakim January 2007 (has links)
"It is not about the product. It is about the total experience." My aim with this project is to explore the interaction between technology, brand, space and the human being in designing an overall experience. We are moving towards a reality where intelligent technology is getting embedded in our homes and our lives. How can we make technology not just intelligent, but also more empathic and sensual? Can we create a relationship to a company, just as if it was a real person? Considering design as communication/conversation, I like to think of the product as a presence of a subject rather than an object, in this case as a spatial presence of a personality that we can reach through our senses. With a design method influenced by thoughts from interpersonal communication and rhetoric, I believe this experience can become more emotional and human. By thinking of products as the most important messengers of brand communication, In this case, I believe the acting and behaviour of the products become crucial in terms of authenticity and trust to the brand message. "A spatial presence of thoughtfulness" is my thesis project sponsored by Electrolux. It is about using these ideas to bring the Electrolux brand philosophy "thinking of you" into life through an emotional experience of thoughtfulness in the home atmosphere. An ambience not only created by the presence of technology, but in dialog with the participatory presence of humans and their actions. / Examensarbete Industridesign kandidatexamensarbete
5

AGRILOGIC sistema para experimentação de controle climático de casas de vegetação. / Agrilogic, a system for research on greenhouse climate control.

Cansado, Jacinto Carlos Ascencio 18 December 2003 (has links)
A agricultura tradicional realizada em campo aberto é dependente do meio físico natural, sendo sua prosperidade resultado de circunstâncias favoráveis do solo, do clima e água, entre outros. A necessidade crescente de se produzir vegetais com alta qualidade, do planejamento da produção agrícola em termos de quantidade e prazo, da redução dos custos por unidade de produção, com a manutenção ou aumento da qualidade têm levado a um aumento da utilização de cultivo protegido. A realização da produção agrícola com uma certa independência das condições climáticas pode ser obtida através da utilização de casas de vegetação, comercialmente conhecidas como estufas. Diversos estudos mostram que as principais variáveis climáticas envolvidas no processo de produção vegetal são: a temperatura, a umidade, a luminosidade e a concentração de gás carbônico. A presença desses fatores, dentro de certos limites mínimos e máximos, proporciona condições propícias para o desenvolvimento vegetal, enquanto que fora desses limites, o desenvolvimento é prejudicado. Portanto, uma boa política de controle dessas variáveis torna-se imprescindível. Este trabalho apresenta um sistema desenvolvido para a pesquisa em controle climático em casas de vegetação, denominado Agrilogic. Ele utiliza elementos comumente encontrados em automação industrial, como CLP (Controlador Lógico Programável) para as atividades consideradas de curto prazo e um software supervisório do tipo SCADA (Supervisory Control And Data Acquisition) para controlar as atividades consideradas de longo prazo e para a IHM (Interface Homem Máquina) de mais alto nível, num computador pessoal. A interligação do CLP com o computador pessoal é feita via modem através de uma linha telefônica. O sistema foi instalado em uma casa de vegetação do Instituto de Biociências da USP para monitoração e controle da temperatura, da umidade relativa do ar e do fotoperíodo, enquanto o computador de supervisão está localizado no Laboratório de Automação Agrícola, na Escola Politécnica da USP. / Traditional open field agriculture is dependent on the natural environment, and its profit is a result of/ derives from favorable soil, weather and water conditions, among other factors. The increasing need to produce high quality crops, to plan agricultural production in terms of quantity and time, to decrease costs, while maintaining or increasing quality has led to protected agriculture. Agricultural production with some independence of weather conditions can be obtained using greenhouses, which provide good weather protection for the crop. There are many studies showing that the main variables related to crop production are: air temperature, air humidity, solar radiation and carbon dioxide concentration. The maintenance of these variables between a minimum and a maximum limit provides good conditions for crop development, whereas, beyond these limits, the development is restrained. Consequently, a good control policy for these variables is deemed necessary. This work presents Agrilogic, a system for research on greenhouse climate control. It uses industrial automation devices, such as PLC (Programmable Logic Controller), which accounts for short time activities and SCADA (Supervisory Control And Data Acquisition), software responsible for the MMI (Man Machine Interface), which accounts for the long-term activities. The system was installed in a greenhouse at Instituto de Biociências, Universidade de São Paulo for temperature, air relative humidity and photoperiod monitoring and control, and it is linked to a personal computer located at the Agricultural Automation Laboratory, at Escola Politécnica da USP, via a modem and a telephone line.
6

AGRILOGIC sistema para experimentação de controle climático de casas de vegetação. / Agrilogic, a system for research on greenhouse climate control.

Jacinto Carlos Ascencio Cansado 18 December 2003 (has links)
A agricultura tradicional realizada em campo aberto é dependente do meio físico natural, sendo sua prosperidade resultado de circunstâncias favoráveis do solo, do clima e água, entre outros. A necessidade crescente de se produzir vegetais com alta qualidade, do planejamento da produção agrícola em termos de quantidade e prazo, da redução dos custos por unidade de produção, com a manutenção ou aumento da qualidade têm levado a um aumento da utilização de cultivo protegido. A realização da produção agrícola com uma certa independência das condições climáticas pode ser obtida através da utilização de casas de vegetação, comercialmente conhecidas como estufas. Diversos estudos mostram que as principais variáveis climáticas envolvidas no processo de produção vegetal são: a temperatura, a umidade, a luminosidade e a concentração de gás carbônico. A presença desses fatores, dentro de certos limites mínimos e máximos, proporciona condições propícias para o desenvolvimento vegetal, enquanto que fora desses limites, o desenvolvimento é prejudicado. Portanto, uma boa política de controle dessas variáveis torna-se imprescindível. Este trabalho apresenta um sistema desenvolvido para a pesquisa em controle climático em casas de vegetação, denominado Agrilogic. Ele utiliza elementos comumente encontrados em automação industrial, como CLP (Controlador Lógico Programável) para as atividades consideradas de curto prazo e um software supervisório do tipo SCADA (Supervisory Control And Data Acquisition) para controlar as atividades consideradas de longo prazo e para a IHM (Interface Homem Máquina) de mais alto nível, num computador pessoal. A interligação do CLP com o computador pessoal é feita via modem através de uma linha telefônica. O sistema foi instalado em uma casa de vegetação do Instituto de Biociências da USP para monitoração e controle da temperatura, da umidade relativa do ar e do fotoperíodo, enquanto o computador de supervisão está localizado no Laboratório de Automação Agrícola, na Escola Politécnica da USP. / Traditional open field agriculture is dependent on the natural environment, and its profit is a result of/ derives from favorable soil, weather and water conditions, among other factors. The increasing need to produce high quality crops, to plan agricultural production in terms of quantity and time, to decrease costs, while maintaining or increasing quality has led to protected agriculture. Agricultural production with some independence of weather conditions can be obtained using greenhouses, which provide good weather protection for the crop. There are many studies showing that the main variables related to crop production are: air temperature, air humidity, solar radiation and carbon dioxide concentration. The maintenance of these variables between a minimum and a maximum limit provides good conditions for crop development, whereas, beyond these limits, the development is restrained. Consequently, a good control policy for these variables is deemed necessary. This work presents Agrilogic, a system for research on greenhouse climate control. It uses industrial automation devices, such as PLC (Programmable Logic Controller), which accounts for short time activities and SCADA (Supervisory Control And Data Acquisition), software responsible for the MMI (Man Machine Interface), which accounts for the long-term activities. The system was installed in a greenhouse at Instituto de Biociências, Universidade de São Paulo for temperature, air relative humidity and photoperiod monitoring and control, and it is linked to a personal computer located at the Agricultural Automation Laboratory, at Escola Politécnica da USP, via a modem and a telephone line.
7

En brukbarhetsanalys av avancerad fastighetsautomation under förvaltningsskedet / An analysis of the serviceability of advanced Building Automation during the management stage

Esselin, Frida, Selimovic, Seherzada January 2015 (has links)
Avancerad fastighetsautomation intog marknaden under 2000-talets första år. Visionen var att skapa smarta byggnader där fastighetsövervakning, klimatstyrning och belysning sammankopplades mot en central huvuddator för att eliminera manuell styrning. Syftet med examensarbetet är att undersöka funktionalitet och reell brukbarhet hos ett av de första installationsobjekten, PostNords huvudkontor. Rapporten presenterar fastighetens övergripande funktioner samt analyserar hur systemstyrningen kan optimeras för bättre lönsamhet respektive komfort. Exemplifieringen påvisar generella risker och potential med avancerade styrsystem i förvaltningsskedet. Arbetet har begränsat sig till fastighetens kontorsytor som stället högst krav på inomhusklimat och användarvänlighet. För att nå uppsatt mål har litteraturstudier, intervjuer, egna observationer samt en genomgång av fastighetsdokumentation genomförts. Resultatet visar att den höga teknikgraden gjort förvaltarna beroende av inhyrd spetskompetens. Det avancerade språket har försvårat kommunikationen mellan parterna vilket begränsat möjligheten att optimera systemet. Förbättring av inomhusklimat och energiprestanda kan först ske när man förstår en helhet. Förvaltarna borde tillsätta en samlad kartläggning av hela systemet istället för att experimentera med ytterligare ny teknik. / Advanced building automation reached the market in the early 2000s. The vision was to create smart buildings where property surveillance, climate control and lightning where to be linked through a main computer to eliminate manual control. The purpose with this thesis is to investigate the functionality and real serviceability of one of the first objects of installation, the PostNord headquarters. This thesis presents the overall features of the real estate and also analyses how the control system can be optimized for higher profitability and comfort. The exemplification shows general risks and potential with advanced control systems in real estate management. This work is limited to the real estates office spaces that demand the highest standards of indoor environment and convenience. To reach set goal, studies of literature, interviews, observations and reviews of property documentation have been executed. The result shows that a high level of technical complexity has made the property managers dependent on hiring expert consultants. The advanced use of language has made the communication between the parts difficult, which has limited the opportunity to optimize the system. Improvement of indoor climate and energy efficiency can only be reached when the entire case is grasped. The real estate managers should start a complete mapping of the system instead of experimenting with additional technology.
8

Analysis of energy efficient heat and lighting systems in a subarctic greenhouse

Sigvardsson, William January 2023 (has links)
This report studies a subarctic greenhouse located in Nikkala, Sweden called Nikkala handelsträdgård. Through a visit to the greenhouse coupled with the creation of two simulation models this study investigates the differences in energy demand with water-carried and air-carried heating systems, high pressure sodium lights and Light emitting diode lights and insulation in parts of the greenhouse without a active cultivation. With the purpose of comparing the alternatives to the existing system at Nikkala handelsträdgård. This, to evaluate if an investment in insulation for the non cultivating parts or changing to a water-carried heating system with Light emitting diode lights could be considered profitable. Operating a greenhouse in a subarctic climate is a hard task and especially if the operation is year round. Efficient heating systems, thermal screens, dehumidifying measures and Lighting systems are crucial to ensure a profitable business. At Nikkala handelsträdgård they are currently using a pellets burner in combination with a air-carried heating system and HPS lamps in the majority of the greenhouse.  The simulations of the main greenhouse were made in Ansys fluent where the crop section was simulated by implementing source terms to a macro porous medium. The parts of the greenhouse which did not host an active cultivation were simulated in IDA ICE.  It was found that saving of just under 14 800 SEK monthly or 18 % could be made by implementing a water-carried heating system in combination with state of the art lighting. Given this a payback-time of 3-9 years could be expected given different scenarios. An implementation of insulation in the non cultivation greenhouse parts would save up to 25 300 SEK annually or 46 % of the heat demand and the investment would give a payback-time of 1-2 years given different scenarios. Given this a reduction of CO2 equivalents of just under 1,9 tonnes could be achieved yearly. It was concluded that relatively inexpensive investments could have a great impact on the energy demand and thereby the economical performance of a subarctic greenhouse. New operations should be built with a LED light system and water-carried heating system and all parts of the greenhouse which is not housing an active cultivation needs to be insulated.
9

Process-Structure-Property Relationship of Micro-channel tube for CO2 Climate Control Systems

Gowreesan, Vamadevan January 2004 (has links)
No description available.
10

Sustainability Review of the Mobile Cooling and Climate Control Industry : A Case Study incorporating LCA and Materiality Assessment / Hållbarhetsgranskning av mobilkylnings- och klimatkontrollsindustrin : En fallstudie med LCA och materialanalys

Pérez, Omar Mayorga, Yalavarthy, Nayanteja January 2020 (has links)
The mobile cooling and climate control industry provides a range of diverse solutions concerning the maintenance of temperature for comfortable living and safe transportation of goods over long distances. One of the major focuses of the industry is the transport sector for which products like cooling boxes and mobile air conditioners are exclusively designed for commercial and leisure purposes. However, the associated emissions released due to their use and the impact they have in the wake of the global climate crisis has led the industry to initiate activities and set targets to address this issue. This study aims to draw sustainable strategy recommendations to the mobile cooling and climate control industry by conducting a Life Cycle Assessment (LCA) of four products and a materiality assessment for a company manufacturing cooling boxes and mobile air conditioners, therefore accelerating the industry’s transition towards sustainability. The objectives are to identify potential material and process-related environmental hotspots over the life cycle of the products and carry out a materiality assessment that identifies topics of materiality for the company, this to outline strategies based on the results of both the LCA and the materiality assessment to improve the company’s sustainability in its operations. The results of the LCA highlighted the role of the use phase as one of the main contributors to the environmental impact from the use of cooling boxes and mobile air conditioners, while the manufacturing of the products and the end-of-life phase are shown to contribute also to the overall impact. Furthermore, different sensitivity scenarios revealed the potential that different materials, the use of batteries and the implementation of a take-back system have to decrease the environmental impacts of the products. From the materiality assessment fourteen material topics were identified to have significance and priority to the company. Based on these results, a total of nine strategies addressing the sustainability of the company and its products were outlined. Across the assessment, three key focus aspects were observed which can facilitate the sustainability transition of the company and industry: energy both in products and operations, collaboration with stakeholders, and circular economy principles and product innovation. Efforts within these areas can potentially improve the industry’s ability to tackle pressures from climate change and the increasing future demand. This study also exemplifies the potential benefits of a synergy between LCA and materiality assessment. It was observed that aiding the materiality assessment with the LCA results provides more tangibility to the results and decreases the subjectivity from the assessment in order to set future sustainability targets. / Mobilkylnings- och klimatkontrollsindustrin erbjuder många lösningar till temperaturhållning för bekvämt boende och säker transport av gods. Ett viktigt fokus för industrin är transportsektorn där produkter som kylboxar och mobil luftkonditionering specialkonstruerad för kommersiell och rekreationell användning. Växthusgasutsläppen från produkterna under användning har mot bakgrund av den globala klimatkrisen fått industrin att sätta mål och starta ett arbete för att minska utsläppen. Den här studien avser att ge hållbara strategier och rekommendationer till mobilkylnings- och klimatkontrollsindustrin genom att genomföra livscykelanalys (LCA) av fyra produkter och en materialanalys till ett företag som tillverkar kylboxar och mobila luftkonditioneringar för att driva industrins övergång till hållbarhet. Målen är att identifiera material- och processrelaterade miljöbelastningar över hela livscykeln av produkterna och genomföra en materialitetstsanalys för att identifiera materialitetsämnen. Utifrån LCA och materialitetsanalysen går att göra strategier att förbättra företagets hållbarhetsarbete. Resultat från LCAn visade vikten av användningsfasen som stod för den största miljöpåverkan från kylboxar or mobil luftkonditionering. Tillverkning och end-of-life hade också påverkan. Känslighetsanalyser visade också den potential materialval, batterianvändning och retursystem har att minska miljöpåverkan från produkter. Fjorton materialitetsämnen utpekades från materialitetsanalysen som viktiga för företaget. Dessa hanteras genom nio strategier som togs fram. Genom analys var tre övergripande fokusområden identifierade som kan underlätta företagets och industris hållbarhetsövergång. De är: energianvändning i både produkterna och företagets arbete, samarbeten med stakeholders samt cirkulär ekonomi och produktinnovation. Ansträngningar inom dessa områden kam förbättra industris förmåga att tackla trycket från klimatkrisen och ökad framtida efterfrågan. Studien visar också på synergin mellan LCA och materialitetsanalys. Att använda resultat från LCA i materialitetsanalysen gav tydligare resultat och minskar subjektiviteten vilket ger bättre förutsättningar när hållbarhetsmål ska sättas.

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