Abstract The demand for temporary buildings has increased during the last few years. The main reason for this increase is the need for temporary housing.  This thesis contains the development of a construction solution that locks, joins and seals sandwich panels together in temporary buildings. This solution also explains how to mount, de-mount and re-mount the buildings and was developed in cooperation with the commissioning company Swetech Design AB.   The project has been limited to just the horizontal joints of Swetech Design AB´s sandwich panels. The panels which the construction solution is going to be applied on have the dimensions of 2703 mm in height, 2297 mm in width and a thickness of 206 mm. The core consists of cellular plastic that is laminated with a material that consists of fiberglass and polyester.   The pre-study consisted of literature studies of various types of joints, the important properties needed in order to make an airproof construction and the various building requirements for temporary residents. The pre-study also consisted of a visit to the module building company Mobile Composite Solutions (MCS) which helped in acquiring knowledge of mounting big units and the manufacturing technique RTM. Even inventories in different branches were made, to get knowledge around the different possibilities and variations of locking, sealing and joining parts.   After the completion of the pre-study a requirements specification and two function analysis where made that put demands and requirements on the concept solution and expressed the concept in terms of functions instead of solutions. The requirements specification and the function analysis became the base of the idea generating phase. This phase resulted in partial solutions and complete solutions which were then combined together to establish different concepts. Through elimination methods, screening tools and discussions together with the commissioning company a final concept was chosen. The concept is built on a tension joint in combination with a sealing profile and a locking device made of an angle steel, bolt and nut which can join and seal the sandwich panels.   The concept has been visualized in the form of sketches, CAD-model, a physical model on a cut-out between two sandwich panels in scale 1:1, basic drawings and a component list. A proposal for continued work has also been presented in order to assure that the construction meets all the requirements listed in the requirements specification and to make it possible for the commissioning company to implement the concept.

Currently, a sustainable energy transition is underway to reduce CO2 emissions. To meet the targets outlined in international agreements like the Kyoto Protocol, a rapid expansion of renewable energy sources, particularly photovoltaic (PV) systems, is underway. Due to photovoltaic technology's rapid development and integration, reliable testing and evaluation methods are essential. This master's thesis is dedicated to developing a PV system simulator to study the PV systems. PV simulators serve as precious tools due to their capacity to control and replicate the environmental conditions experienced by PV panels. Consequently, these simulators facilitate thorough research, design refinement, and PV system performance assessment. The developed PV system simulator is essentially a PV remote lab, offering the capability to monitor, gather data, and evaluate the performance of the PV system remotely. The proposed system's flexibility and scalability enable its application to study various types of PV installation. The PV remote lab is expected to be a training centre for students and industry professionals. A comprehensive literature review on photovoltaic technology has been undertaken. Following the literature review, the different components that form a PV system have been defined and selected. The system will have a communication block to achieve a flexible and scalable PV remote lab. In this way, different configurations of the PV panels and different system outputs can be implemented. This commutation block can be remotely controlled using an Arduino, and an interface can be designed where the desired PV panel configurations and system outputs can be selected. In this interface, visualising the tests' results will also be possible. / För närvarande pågår en hållbar energiomställning för att minska koldioxidutsläppen. För att uppfylla de mål som fastställts i internationella avtal som Kyotoprotokollet pågår en snabb utbyggnad av förnybara energikällor, särskilt solcellssystem (PV). På grund av solcellsteknikens snabba utveckling och integration är tillförlitliga test- och utvärderingsmetoder av avgörande betydelse. Denna masteruppsats handlar om att utveckla en solcellssimulator för att studera solcellssystem. PV-simulatorer är värdefulla verktyg eftersom de kan kontrollera och återskapa de miljöförhållanden som PV-panelerna utsätts för. Följaktligen underlättar dessa simulatorer grundlig forskning, designförbättring och bedömning av PV-systemets prestanda. Den utvecklade PV-systemsimulatorn är i grunden ett fjärrstyrt PV-labb som gör det möjligt att övervaka, samla in data och utvärdera PV-systemets prestanda på distans. Det föreslagna systemets flexibilitet och skalbarhet gör att det kan användas för att studera olika typer av solcellsinstallationer. PV-fjärrlabbet förväntas bli ett utbildningscenter för studenter och yrkesverksamma inom branschen. En omfattande litteraturgenomgång om solcellsteknik har genomförts. Efter litteraturgenomgången har de olika komponenterna som bildar ett solcellssystem definierats och valts ut. Systemet kommer att ha ett kommunikationsblock för att uppnå ett flexibelt och skalbart PV-fjärrlabb. På så sätt kan olika konfigurationer av solcellspanelerna och olika systemutgångar implementeras. Detta kommutationsblock kan fjärrstyras med en Arduino och ett gränssnitt kan utformas där de önskade konfigurationerna av solcellspaneler och systemutgångar kan väljas. I detta gränssnitt kommer det också att vara möjligt att visualisera testresultaten.