Identifiering av parametrar till ackumulatortanken Solus1050 från consolar - en metodbeskrivning

This report describes the work done creating a computer model of a kombi tank from Consolar. The model was created with Presim/Trnsys and Fittrn and DF were used to identify the parameters. Measurements were carried out and were used to identify the values of the parameters in the model. The identifications were first done for every circuit separately. After that, all parameters are normally identified together using all the measurements. Finally the model should be compared with other measurements, preferable realistic ones. The two last steps have not yet been carried out, because of problems finding a good model for the domestic hot water circuit.The model of the domestic hot water circuit give relatively good results for low flows at 5 l/min, but is not good for higher flows. In the report suggestions for improving the model are given. However, there was not enough time to test this within the project as much time was spent trying to solve problems with the model crashing. Suggestions for improving the model for the domestic circuit are given in chapter 4.4. The improved equations that are to be used in the improved model are given by equation 4.18, 4.19 and 4.22.Also for the boiler circuit and the solar circuit there are improvements that can be done. The model presented here has a few shortcomings, but with some extra work, an improved model can be created. In the attachment (Bilaga 1) is a description of the used model and all the identified parameters.A qualitative assessment of the store was also performed based on the measurements and the modelling carried out. The following summary of this can be given: Hot Water PreparationThe principle for controlling the flow on the primary side seems to work well in order to achieve good stratification. Temperatures in the bottom of the store after a short use of hot water, at a coldwater temperature of 12°C, was around 28-30°C. This was almost independent of the temperature in the store and the DHW-flow.The measured UA-values of the heat exchangers are not very reliable, but indicates that the heat transfer rates are much better than for the Conus 500, and in the same range as for other stores tested at SERC.The function of the mixing valve is not perfect (see diagram 4.3, where Tout1 is the outlet hot water temperature, and Tdhwo and Tdhw1 is the inlet temperature to the hot and cold side of the valve respectively). The outlet temperature varies a lot with different temperatures in the storage and is going down from 61°C to 47°C before the cold port is fully closed. This gives a problem to find a suitable temperature setting and gives also a risk that the auxiliary heating is increased instead of the set temperature of the valve, when the hot water temperature is to low.Collector circuitThe UA-value of the collector heat exchanger is much higher than the value for Conus 500, and in the same range as the heat exchangers in other stores tested at SERC.Boiler circuitThe valve in the boiler circuit is used to supply water from the boiler at two different heights, depending on the temperature of the water. At temperatures from the boiler above 58.2°C, all the water is injected to the upper inlet. At temperatures below 53.9°C all the water is injected to the lower inlet. At 56°C the water flow is equally divided between the two inlets. Detailed studies of the behaviour at the upper inlet shows that better accuracy of the model would have been achieved using three double ports in the model instead of two. The shape of the upper inlet makes turbulence, that could be modelled using two different inlets. Heat lossesThe heat losses per m3 are much smaller for the Solus 1050, than for the Conus 500 Storage. However, they are higher than those for some good stores tested at SERC. The pipes that are penetrating the insulation give air leakage and cold bridges, which could be a major part of the losses from the storage. The identified losses from the bottom of the storage are exceptionally high, but have less importance for the heat losses, due to the lower temperatures in the bottom. High losses from the bottom can be caused by air leakage through the insulation at the pipe connections of the storage.

Byggnadssektorn och framtiden : Session 1, Dalarnas Energi- och klimatseminarium 10 maj 2011

En enkel Delphi-enkät skickades till drygt 100 beslutsfattare och experter inom Dalarnas byggsektor. Enkätdeltagarna tog ställning till 15 framtidsteser om bebyggelsens energiomställning. Enkätutfallet visar att få deltagare tror att energieffektiviseringsmålen kommer att kunna nås i tid. Staten och fastighetsägarna anses vara de viktigaste aktörerna för att förverkliga framtidsteserna. Lite förtroende finns det för frivilliga beteendeförändringar hos brukarna och stor oenighet råder kring renoveringens betydelse för energiomställningen.

Energy savings potential in existing houses : Energy simulation results for Dalarna's single-family housing stock

Vägar till en halverad energianvändning i Dalarnas byggnadsbestånd

Dalarnas byggnadsbestånd : Sammansättning och energianvändning 2008

Dalarnas byggnadsbestånd kännetecknas av en stor andel bostäder, i synnerhet småhus. Permanentbebodda småhus och fritidshus utgör 60% av den uppvärmda arean i länet och bostäderna uppskattas stå för över 80% av energianvändningen i länets bebyggelse. En stor andel av bebyggelsen är byggt före 1961 och nybyggnationstakten har varit mycket låg sedan mitten av 1990 ‐talet. Detta i kombination med en låg rivningstakt gör att energiomställningen måste ske i den befintliga bebyggelsen, förutsatt att rådande trender inte bryts radikalt. Ägarstrukturen av den befintliga bebyggelsen är mycket fragmenterad på grund av den höga andelen småhus, vilket måste påverka strategin för omställningsarbetet. Tänkbara kommande analyser av bl.a. specialenheterna (skolor, allmänna byggnader, idrottsanläggningar etc.), fritidshusen och socioekonomiska faktorer relaterade till länets bebyggelse skulle kunna förfina problembilden och underbygga det långsiktiga strategiska arbetet för energieffektiviseringen i länet.

Vägar till en halverad energianvändning i Dalarnas småhusbebyggelse

Denna rapport är en svensk sammanfattning av licentiatavhandlingen med titeln "Simple Question, Complex Answer. Pathways towards a 50% Decrease in Building Energy Use", som publicerades vid Uppsala Universitet i februari 2014. I denna rapport har jag samman-ställt det som jag anser vara de viktigaste resultaten ur ett länsperspektiv och rapporten riktar sig därför i första hand mot aktörer inom byggnadssektorn i Dalarna. Mer omfattande bild-material, diagram, tabeller och hänvisningar till källmaterial återfinns för den intresserade i licentiatavhandlingen. Min förhoppning är att denna sammanfattning kan ligga till grund för diskussioner och beslut om framtiden för Dalarnas småhusbestånd.

Hushållsavfall i Borlänge kommun : analyser av material en och flerfamiljshus

In Borlänge, source separation has been the basis for management of household waste for over five years. This report reviews today?s system and gives a model for further follow-up through waste grouping. In the basic system waste is separated into three fractions: biodegradable, waste to energy and waste to landfill. All waste is packed in plastic bags, put in separate containers for each fraction, and collected from the property. Separate analyses were made of waste from single family houses and apartment buildings. The amount of waste per household and week, number of non-sorted bags, purity, recovery rate and density of each fraction was calculated. The amount of packaging collected together with the household waste is given. Material collected under the Swedish law of Producers? Responsibility is not covered in this report.

Simple Question, Complex Answer : Pathways Towards a 50% Decrease in Building Energy Use

Addressing building energy use is a pressing issue for building sector decision makers across Europe. In Sweden, some regions have adopted a target of reducing energy use in buildings by 50% until 2050. However, building codes currently do not support as ambitious objectives as these, and novel approaches to addressing energy use in buildings from a regional perspective are called for. The purpose of this licentiate thesis was to provide a deeper understanding of most relevant issues with regard to energy use in buildings from a broad perspective and to suggest pathways towards reaching the long-term savings objective. Current trends in building sector structure and energy use point to detached houses constructed before 1981 playing a key role in the energy transition, especially in the rural areas of Sweden. In the Swedish county of Dalarna, which was used as a study area in this thesis, these houses account for almost 70% of the residential heating demand. Building energy simulations of eight sample houses from county show that there is considerable techno-economic potential for energy savings in these houses, but not quite enough to reach the 50% savings objective. Two case studies from rural Sweden show that savings well beyond 50% are achievable, both when access to capital and use of high technology are granted and when they are not. However, on a broader scale both direct and indirect rebound effects will have to be expected, which calls for more refined approaches to energy savings. Furthermore, research has shown that the techno-economic potential is in fact never realised, not even in the most well-designed intervention programmes, due to the inherent complexity of human behaviour with respect to energy use. This is not taken account of in neither current nor previous Swedish energy use legislation. Therefore an approach that considers the technical prerequisites, economic aspects and the perspective of the many home owners, based on Community-Based Social Marketing methodology, is suggested as a way forward towards reaching the energy savings target.

O valor da marca para o consumidor final a partir do conceito de brand equity no mercado de iogurtes

O tema Brand Equity tem atraído a atenção de estudiosos de marketing devido a importância estratégica que a questão marca vem adquirindo no cenário empresarial. Um exemplo que comprova a relevância do tema para a academia está na publicação de uma edição especial do Journal of Marketing Research no ano de 1994 unicamente dedicada a apresentação de artigos relacionados à Brand Equity. Existem duas abordagens básicas que norteiam os estudos nessa área: a determinação do valor patrimonial da marca e a busca pelo melhor aproveitamento ( produtividade) dos recursos do composto de marketing. Ambas, na verdade se complementam, mas, enquanto a primeira busca a correta determinação do valor contábil da marca para fins de apropriação em balanço e também com o objetivo de facilitar negociações entre empresas em questões relativas a fusões e aquisições, a segunda abordagem centra o seu foco na real efetividade do marketing que vem sendo praticado pelas empresas, considerando a marca como o elemento unificador de todas as suas ações mercadológicas. Assim, para identificar os níveis de produtividade obtidos através das ações de marketing, os estudiosos voltam-se para os consumidores, procurando compreender como estes agem e pensam a compra através das marcas. Utilizando-se desta última abordagem, procurou-se neste trabalho verificar a ocorrência de valorização da marca tendo como foco uma categoria de produto que representasse a definição de bem de conveniência. Avaliadas as possibilidades, optouse pela categoria de produtos iogurte. Partindo do pressuposto de que a valorização da marca é percebida pela ocorrência de uma reação diferenciada a uma ou algumas marcas, reação esta 5 identificada quando da exposição do comprador/ consumidor às diferentes marcas concorrentes, situação observável no momento da compra, realizou-se a presente pesquisa. Para a sua execução foram realizadas duas etapas de pesquisa: uma primeira de natureza exploratória com a realização de entrevistas junto a representantes do setor e também de dois grupos focais e uma outra etapa na qual se utilizou a técnica de análise multivariada denominada Conjoint Analysis. Os resultados demonstraram que, para este produto específico, a marca é um elemento fundamental na definição de compra, sendo o primeiro ou o segundo atributo mais valorizado pelos compradores / consumidores. Algumas possíveis explicações que referendam os resultados foram obtidas durante a primeira fase da pesquisa. Por fim, são expostos os possíveis caminhos para novas pesquisas na área de Valor de Marca.