The spray drying process is widely established in the industry worldwide. However, due to its complexity in predicting variables, the technology is often regarded as a "Black box" process. In this study, a model based on energy and mass balances is designed and validated using Matlab/Simulink software and real data from a medium-sized machinery, specifically the Production Minor manufactured by GEA NIRO S/A. Additionally, the simulation incorporates a heat recovery system based on a heat pump, and its economic feasibility is examined.The simulation is validated for a narrow range of variables and demonstrates an accuracy of approximately 95% in most cases.The heat recovery system achieves an average natural gas savings of 0.43 kg/h. However, this saving is accompanied by an additional electrical consumption of 2.1 kW resulting from the operation of the heat pump.The economic feasibility study of the heat recovery system reveals an extra production cost of 0.1€/h in exchange for a 36% average reduction in natural gas dependency.

The rise in green-house gases emissions is an overall problem nowadays, in order to achieve the European goals by 2030, several changes are needed. Supermarkets are responsible of 3% of the emissions in Sweden, which makes them a clear target to reduce emissions. By using heat recovery systems, supermarkets can recover part of the heat excesses and use it for ambient or water heating. This can generate a reduction in heat demand, however, to be able to recover heat excess, more electricity is consumed. In the case study conducted, the heat recovery system of a supermarket in Matorp, Sweden has been analyzed. Studying the performance of the system, it has been seen that the COP values are around 2, low values compared with other case studies. The reason for this low performance is because of low discharge pressure, that also leads to a low amount of heat recovered. In the techno economic analysis, the operational costs of the heat recovery system are compared to the ones that a floating condensations system would have had. In the operational costs, both the electricity and the heating costs are considered. The results show that the overall floating condensation costs are only 1.86% higher than the heat recovery costs. This is a small value, but it has to be taken into account that the performance of the system and the heat recovered is low. Finally, in the environmental analysis the CO2 emissions savings by using a HR instead of a FC one is calculated, showing a reduction of 2.3 tons of CO2 per year. / Ökningen av utsläpp av växthusgaser är ett övergripande problem nuförtiden, och för att uppnå de europeiska målen till 2030 behövs flera förändringar. Supermarkets står för 3% av utsläppen i Sverige, vilket gör dem till en tydlig målgrupp för att minska utsläppen. Genom att använda värmeåtervinningssystem kan livsmedelsbutiker återvinna en del av överskottsvärmen och använda den för uppvärmning av lokaler eller vatten. Detta kan minska värmebehovet, men för att kunna återvinna överskottsvärme förbrukas mer elektricitet. I den genomförda fallstudien har värmeåtervinningssystemet i en livsmedelsbutik i Matorp, Sverige analyserats. Genom att studera systemets prestanda har man sett att COP-värdena ligger runt 2, vilket är låga värden jämfört med andra fallstudier. Anledningen till denna låga prestanda är det låga avluftningstrycket, vilket också leder till en låg mängd återvunnen värme. I den tekno-ekonomiska analysen jämförs driftskostnaderna för värmeåtervinningssystemet med de som ett flytande kondensationssystem skulle ha haft. I driftskostnaderna beaktas både el- och uppvärmningskostnader. Resultaten visar att de totala kostnaderna för flytande kondensation endast är 1,86% högre än kostnaderna för värmeåtervinning. Detta är ett litet värde, men det måste beaktas att systemets prestanda och den återvunna värmen är låg. Slutligen, i den miljömässiga analysen beräknas minskningen av CO2-utsläpp genom att använda ett HR istället för ett FCsystem, vilket visar en minskning med 2,3 ton CO2 per år.

The use of gas microturbines as a primary unit in CHP is still weak in the industrial process. It gives the driving force to the main aim of this master thesis, which is the technical and economic evaluation of the gas microturbines waste heat recovery system, which is the key factor for their economic sustainability. Assignment contains description of CHP system that was gradually built in LENP laboratory, part of NETME Centre. The author has joined the final work before start-up of the CHP system. He presents and describes results of the first experiments on this unit. The flue gas of a microturbine was used for heating water by heat exchanger flue gas–water and for direct linen drying. The case study of laundry with capacity 10 tons per shift was developed in cooperation with companies in laundry care. Results of those tests were used to process integration and utilization of this professional industrial laundry All obstacles found and opportunities of the use of microturbines are comprehensively described and tested in case studies, which are simulated in Chemstation Chemcad Software. Results of the thesis are expected to be useful these fields: the use of gas microturbines in industry & energy savings in industrial laundries.

The master thesis deals with the issue of heat recovery and efficiency of exchangers. The experimental part is dedicated to the measurment of efficiency of a plastic model of heat exchanger with atypical construction compared to a standard plate heat exchanger. For production of the heat exchangers 3D printer was used so the thesis uses the possibilities that 3D printing is offering nowadays.

This diploma thesis is focused on problems of heat exchangers. There are two main objectives. The first objective is based on long-term measuring of enthalpy heat exchanger, processing of measured data and comparison of result with manufacturer's results. The second objective is design of variant solutions for two types of heat exchanger of air conditioning unit of selected shop. For variant without moisture transportation was selected cross flow exchangers. Thanks to knowledge from long-term measurement, was selected enthalpy heat exchanger for variant with moisture transportation. Chosen variants were compared with emphasis on heat and moisture exchange efficiency with requirements on Ecodesign.

The subject of this dissertation is the design of an air conditioning system for a family house. The design contains the actual state, in which a central unit with variable air volume regulators and air supply adjustment is designed. The first version of optimisation offers a simple central ventilation, and in the second version a decentral ventilation for the object. These options were compared based on their purchasing price and additionally from the interior comfort feel point of view. In the next part a long-term measurement of an energy recovery ventilation was performer, and data was processed to evaluate and compare the efficiency with efficiency promised by producer.