In a renewable energy-based system, energy storage must match the energy demand with supply. Usually a lead-acid battery is utilised as a short-term energy buffer. A system, which has a combination of an electrolyser and a high-pressure hydrogen tank for long-term energy storage, is considered...

The naval submarines have conventionally been equipped with diesel-electric propulsion. The diesel generators charge the batteries when the submarine is at the surface or at snorkelling depth. This is the biggest short-coming of this system as the submarine can be detected due to the infrared...

During the development process of solid oxide fuel cells (SOFCs) for Auxiliary Power Unit (APU) applications heat-up experiments are performed with hot gases. The inlet temperatures and the mass flow rates of the hot gases are adjusted experimentally to avoid high local thermal gradients and...

Modeling tools and technologies that will allow reaching decarbonization goals in the most cost-effective way are imperative for the transition to a climate-friendly energy system. This includes models which are able to optimize the design of energy systems with a large number of spatially...

An earlier expression for the heat transfer coefficient between the heated surface and the flowing fluid used in the investigation of the performance of a few collector/storage systems leads to results which are physically impractical. In this communication we derive the correct expression for...

A periodic analysis of the novel [`]transwall' for passive heating is described and the thermal flux entering an air-conditioned space through the [`]transwall' is evaluated. Numerical calculations have been performed corresponding to the meteorological data of the 11th of January at Boulder,...

Based on the periodic solution of the heat conduction equation, an analysis has been developed to study the thermal performance of a simple domestic solar water-heating system consisting of a thermal-trap solar-energy collector, connected to a water tank. To study the effects of typical...

Sensitivity analysis is a technique that evaluates the model response to changes in input assumptions. Due to uncertain prices of primary fuels in the world market, Government regulations for sustainability and various other technical parameters there is a need to analyze the techno-economic...