Baking ovens are necessary to be installed in a paint shop of assembly automotive manufacturers for drying the paint of automotive bodies (i.e., in the coating process). In this process, a large amount of heat is provided by burning the natural gas in the gas burner. Practically, the design of the heat confinement in the oven is often poor, which results in considerable heat losses (i.e., waste heat) which are released during the drying process and significantly raise the temperature of a working environment thereby lowering the thermal comfort of the factory staff. To address this issue and limit the waste heat transfer to the surroundings, the application of a waste heat recovery system of a specific design employing the organic Rankine cycle (ORC) may be a viable alternative solution. A combined design of such a system utilizing an evaporator and thermal energy storage (TES) device in a simple ORC layout will be discussed in this article. The obtained simulation result was computed using MATLAB coupled with thermophysical properties libraries, i.e., CoolProp. The obtained results indicate that the sustainability of the studied system scheme appears to be favorably implemented in the selected paint shop and may benefit to lower the temperature of the working area, improve the thermal comfort of factory staff and at the same time produce electricity since some car/automotive manufacturers likely run the production for over 20 hours per day.
The article analyzes opportunities of locating large-scale wind or solar farms in overburden disposal areas, formed as a result of opencast lignite mining. Its main purpose is to present different conditions and limitations for such investments in post-mining regions. The most important aspects include wind or sunlight conditions, geotechnical conditions of the overburden disposal areas where soil and rock materials were deposited during many years of lignite mining and local spatial planning conditions defined by local governments. These, and other conditions cause that the wind or photovoltaic plant investment in the overburden disposal area, might create a challenging process. The legal requirements are discussed in detail, regarding spatial, environmental and infrastructural characteristics of the overburden dumping sites situated inside Jóźwin II B and Jóźwin IIA open pits belonging to the PAK Konin Lignite Mine S.A. located in the west-central part of Poland. The results demonstrate that among the legal conditions for the construction of renewable energy plants, the most restrictive limitation concerns wind farms and precludes the rehabilitation of Konin overburden dumps in this direction. Until the construction of wind farms is legally impossible at closer distances to residential buildings, photovoltaic power plants are the only option for the development of post-mining areas towards large-scale renewable power generation.
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