Investigation of New Heat Exchanger Design Performance for Solar Thermal Chemical Heat Pump

The emergence of Thermally Driven Cooling system has received more attention recently due to its ability to utilize low grade heat from engine, incinerator or simple flat plate solar collector which are considered as renewable energy sources. ClimateWell AB located in Stockholm has been developing this cooling system based on its patented chemical heat pump technology. The heat pump with […]

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Liquid Monopropellant Injector Development for High Power Electrodeless Plasma Thruster

The thesis work aims at developing a liquid monopropellant injector for a high power electrodeless plasma thruster. The feasibility of using a chemical monopropellant for electric propulsion is investigated. After a design phase, the injector is put to the test with a simulant to the real liquid monopropellant in a simulated environment. Theoretical models are created to predict the power […]

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Implementation of Solar Energy in Eco-Cities

The purpose of this study is to investigate the potential of implementing solar energy and solar technology systems in the energy systems of two conceptual Eco-Cities, as a possible way of tackling the inherent problems in global urbanization and contributing to a sustainable future. The cities are formed as one suburb to Sydney in Australia, and one suburb to Stockholm […]

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Experimental Analysis of Variable Capacity Heat Pump System Equipped With Vapour Injection and Permanent Magnet Motor

This study analyzes the performance of variable capacity heat pump scroll compressor which is equipped with vapour injection and permanent magnet motor. Refrigerant used in the system is R410A. The study is divided in two phases. In first phase, tests are carried out for heat pump without vapour injection. Heat pump’s performance including COPs, heating/cooling capacities, inverter losses, heat transfer […]

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Industrial Solid-State Energy Harvesting: Mechanisms and Examples

This paper explores the potential for solid-state energy harvesting in industrial applications. In contrast to traditional heat recovery, the output of solid-state devices is electricity, which can be readily used in virtually any plant. The progress in harvesting waste heat via thermoelectric and thermionic generators is described. With second law efficiencies now approaching 50% and 80% respectively, we show that […]

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The Performance of the Energy Machine: A Comparative Study of the Energy Machine and a Conventional Heat Pump System

The Achilles heel of the heat pump technology has for long been the low efficiency occurring during domestic hot water production. The problem is the high condensation pressure needed to reach high temperatures. To produce domestic hot water, the system need to deliver a supply temperature of about 60 °C, to be compared with a supply temperature of around 30-50 […]

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Optically Selective Surfaces in Low Concentrating PV/T Systems

One of the traditional approaches to reduce costs of solar energy is to use inexpensive reflectors to focus the light onto highly efficient solar cells. Several research projects have resulted in designs, where the excess heat is used as solar thermal energy. Unlike a solar thermal system, which has a selective surface to reduce the radiant heat loss, a CPV/T […]

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Improving Engine Oil Cooler Performance: for Future Vehicle Applications

This project describes the process of improving the engine oil cooler performance for future vehicle applications, from ideas to simulated concepts. Increasing market expectations of high engine power, low fuel consumption and high towing capabilities results in an ever rising pressure on the cooling system in modern cars. The desire to prevent a future situation where the engine oil could […]

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Detection of Frazil Ice at Water Intakes at Träbena Power Station

Frazil ice is a phenomenon that takes place in cold regions when the water of rivers, lakes or oceans is cooled under 0ºC. Several times during winter, frazil ice can appear at river Ätran, where Träbena hydropower plant is held by the company Wetterstad Consulting AB. Frazil ice particles contained in the flowing water are extremely sticky and adhere to […]

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Competitive Thermokinetics and Non-linear Fire Behaviour

The prediction of the behavior and spread of fires in the bush has always been fraught with a large number of unknowns, not the least of which has been the seemingly capricious nature of fire itself. Operational bushfire prediction systems, developed as they are using empirical methods, aim to predict the long-term mean spread of a bushfire based on its […]

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