This paper analyzes the influence of the penetration of solar radiation through the transparent closure in consumption of energy for conditioning of the office buildings in the region of Santa Maria-RS, located in the bioclimatic Brazilian zone 2. To do this, simulations were performed in the computational program Design Builder, in a typical office environment in order to evaluate the comparative results obtained with the use of different types of glass (Solar Factor) by different percentages of area of windows and surface guidelines. The glasses used had solar factor ranging from 0.85, 0.70, 0.56 and 0.29, an opening percentage area of 20%, 50% and 80%, while the solar orientation ranged from 0° to 315° at an interval of 45°. It was observed that for the climate of the city of Santa Maria-RS, considering the daytime use of the building, the consumption of energy for cooling process has higher values compared to the heating and that this difference is directly proportional to the solar factor of the glass and the percentage of openings in the facade. Changes that contribute to a reduction of one of these lead to an increased consumption of the other, these should be analyzed jointly in the process of defining the openings, in order to obtain the lowest annual energy consumption. The simulations indicated higher expenditure of energy with heating on the facades oriented to the south, southeast, and southwest, while the higher cost for cooling occurred on facades oriented to the north, northeast, northwest, regardless of the solar factor or percentages of openings in façade. It was observed that, when established constructive guidelines regarding apertures in construction performance standards for buildings, should be considered together the percentage of area openings, Factor Solar glass and solar orientation of the facade, as the exchanges of heat and entry lighting are naturally associated with these factors in an integrated manner. / Este trabalho analisa a influência da radiação solar que penetra pelos fechamentos transparentes no consumo de energia para climatização de edifícios de escritório na região de Santa Maria RS, situado na zona bioclimática 2 brasileira. Para isso, foram realizadas simulações no programa computacional Design Builder, em um ambiente típico de escritório, visando avaliar comparativamente os resultados obtidos com o uso de diferentes tipos de vidro (Fator Solar), mediante diferentes percentuais de área de janelas e orientações de fachada. Os vidros utilizados têm valores de Fator Solar variando de 0.85, 0.70, 0.56 e 0.29, o percentual de área de abertura de 20%, 50% e 80%, enquanto a orientação solar variou de 0° a 315°, com intervalo de 45°. Foi observado, para o clima da cidade de Santa Maria-RS, considerando-se o uso diurno do edifício, que o consumo de energia para resfriamento apresenta valores mais elevados em relação ao aquecimento, e que esta diferença é diretamente proporcional ao Fator Solar do vidro e ao percentual de aberturas na fachada. Mudanças que colaboram para a redução de um destes consumos levam ao aumento do outro, devendo-se analisá-los de forma conjunta, no processo de definição das aberturas, para que se obtenha o menor consumo anual de energia. As simulações indicaram maiores gastos de energia com aquecimento nas fachadas orientadas para sul, sudeste e sudoeste, enquanto os maiores gastos com resfriamento ocorrem com fachadas orientadas a norte, nordeste e noroeste, independente do Fator Solar do vidro ou do percentual de aberturas na fachada. Foi observado que, ao serem estabelecidas diretrizes construtivas referentes a aberturas em normas de desempenho de edificações, devem ser considerados conjuntamente o percentual de área de aberturas, o Fator Solar do vidro e a orientação solar da fachada, pois as trocas de calor e entrada de iluminação natural estão associadas a estes fatores de forma integrada.

Utö ligger ca 16 km nordost om Nynäshamn i Stockholms skärgård som förvaltas av Skärgårdsstiftelsen. På öns norra del ligger Utö Värdshus som har hotell, stugor, restaurang, konferens och-samlingslokaler. Delar av Värdshuset är idag uppvärmda med hjälp av värmepumpar i en värmecentral som tar sin värme från närbelägna vattenfyllda gruvhål. Ventilationen i fastigheterna som används som konferens och samlingslokaler är bristfällig och uppfyller inte dagens standard för konferenslokaler. Syftet med projektet var att undersöka möjligheter och kostnader för att förbättra ventilationen i byggnaderna samt undersöka förslag för att minska energianvändningen. Projektet har genomförts i samarbete med Skärgårdsstiftelsen, Utö Värdshus och med Värmex som bidragit med underlag för värmecentralen. Studiebesök har genomförts för att samla data och för att kunna kartlägga de nuvarande energisystemen. Modeller för konferensbyggnaderna har skapats i simuleringsprogrammet Design Builder där även besparingspotential har varit möjlig att fastslå vid implementering av förbättrad ventilation. Beräkningar har genomförts för att få fram viktiga nyckeltal som använts i simuleringarna samt vid dimensionering av en ny värmecentral. Genom att installera FTX-ventilation samt minska infiltrationen i Societetshuset och Disponenthuset kan 34 % respektive 54 % av det årliga värmebehovet reduceras i byggnaderna. Om även ett värmenät installeras kopplat till samtliga byggnader som ingår i studien och om en ny värmepump och ett solvärmesystem installeras, kan en besparing motsvarande 84 000 SEK per år erhållas i elkostnader. Om dessa förbättringsförslag implementeras kan även koldioxidutsläppen reduceras med 3,1 ton vilket motsvarar 34 % av de nuvarande utsläppen.

No description available.

The ground source resources are becoming more and more popular and now the ground source heat pumps are frequently used for heating and cooling different types of buildings. This thesis aims at giving a contribution in the development of the thermal modelling of borehole heat storage systems. Furthermore, its objective is to investigate the possibility of implementing of a GSHP (ground source heat pump) with vertical boreholes, in order to deliver the heating and cooling demand for a passive house and to emphasize some certain advantages of this equipment even in the case of a small building (e.g. residential house). A case study is presented to a suitable modelling tool for the estimation of the thermal behaviour of these systems GSHP by combining the outcome from different modelling programs. In order to do that, a very efficient residential solar house (EFden House – a passive residential single-family house, which was projected and built in Bucharest with academic purposes) is being analysed. The numerical results are produced using the software DesignBuilder, EED (Earth Energy Designer) and a sizing method for the length of the boreholes (ASHRAE method). The idea of using 2 different modelling programs and another sizing method for the borehole heat exchanger design (ASHRAE method) is to make sure that all the calculations and results are valid and reliable when analysing such a system theoretically (in the first phases of implementing a project), before performing a geotechnical study or a thermal response test in order to assess the feasibility of such a project beforehand. The results highlight that the length of the borehole, which is the main design parameter and also a good index in estimating the cost of the system, is directly influenced by the other fundamental variables like thermal conductivity of the grout, of the soil and the heat carrier fluid. Also, some correlations between these parameters and the COP (coefficient of performance) of the system were made. The idea of sizing the length of boreholes using two different methods shows the reliability of the modelling tool. The results showed a difference of only 2.5%.  Moreover, the length of borehole is very important as it was calculated that can trigger a difference in electricity consumption of the GSHP up to 28%. It also showed the fact that the design of the whole system can be done beforehand just using modelling tools, without performing tests in-situ. The method aims at being considered as an efficient tool to estimate the length of the borehole of a GSHP system using several modelling tools. / <p>The presentation was made via Skype due to the programme being online based</p>

The energy used in non-domestic buildings accounts for 18 % of the energy use in the UK. Within the non-domestic building stock, 11 % of office buildings have a very high influence on the energy use. Thus, the retrofit of office buildings has a significant potential for energy efficiency and greenhouse gas emissions reduction within the non-domestic building stock. However, the replacement rate of existing buildings by new-build is only around 1-3 % per annum. Post-war office buildings, (built between 1945 and 1985) represent a promising sector for retrofit and energy demand reduction. They have disproportionately high energy consumption because many were built before the building regulations addressed thermal performance. The aim of the research is to evaluate the retrofit strategies for post-war office buildings accounting for the improved energy efficiency, thermal comfort and hence, productivity, capital and the running costs. The research seeks to provide the optimal generic retrofit strategies and illustrate sophisticated methods which will be the basis for guidelines about post-war office building retrofit. For this, multiple combinations of heating and cooling retrofit measures were applied to representative models (Exemplar) of post-war office buildings using dynamic thermal simulation modelling. The retrofit strategies include; applying envelope retrofit to UK Building Regulations Part L2B and The Passivhaus Institue EnerPHit standards for heating demand reduction and winter comfort. Passive cooling interventions such as shading devices and night ventilation and active cooling intervention such as mixed-mode ventilation were applied to overcome summer overheating. All retrofit combinations were evaluated considering future climate, inner and outer city locations and different orientations. In summary, the results showed that under current weather conditions Part L2B standard retrofit with passive cooling provided the optimum solution. In 2050, however, both Part L2B retrofit naturally ventilated cases with the passive cooling measures and EnerPHit retrofit mixed-mode ventilation cases provide the requisite thermal comfort and result in a similar range of energy consumption. It was concluded that to create generic retrofit solutions which could be applied to a given typology within the building stock is possible. The methodology and the Exemplar model could be used in future projects by decision-makers and the findings and analysis of the simulations could be taken as guidance for the widespread retrofit of post-war office buildings.