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Serafino, Aldo
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Serafino
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Aldo
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Aldo Serafino
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Comparison of Different Evaporator Topologies for Industrial Heat PumpsVermani, Sanjay; Anand, Nitish; Van Bael, Johan; Touliankine, Evgueni; Serafino, Aldo; De Servi, CarloReducing the energy consumption associated with industrial process heating is one of the crucial steps toward building a green and climate-neutral Europe, as the thermal energy demand of industry accounts for a significant portion of the total primary energy consumption and carbon emissions of this sector. In this regard, waste heat utilization using high-temperature heat pump systems is one of the most promising solutions to increase industrial energy efficiency. To efficiently recover and convert the available waste heat, the performance of the individual heat pump components, in particular the heat exchangers, is key. This paper reports a comparison between two different evaporator concepts considered for high-temperature heat pump systems, namely the shell and tube and the falling film evaporator. Four key characteristics of the two evaporator concepts are analyzed and compared: the overall heat transfer coefficient, the induced pressure losses, the footprint, and the required refrigerant charge. The results indicate that the falling film evaporator features a higher overall heat transfer coefficient and enables approximately a 77% reduction of the required working fluid charge with respect to the shell and tube evaporator.- DECISION-MAKING MATRIX FOR THE SELECTION OF MIXTURE IN ORC APPLICATIONCombaluzier, William; Tauveron, Nicolas; Beaughon, Michel; Serafino, AldoORC is an established and affordable technology to convert efficiently low/medium grade thermal energy to power. The choice of the working fluid is critical to the performance of the ORC. The use of zeotropic mixtures as a cycle working fluid could lead to an efficiency enhancement, thanks to the nonisothermal phase change occurring at both the condenser and the evaporator. Therefore, there has been a growing interest for mixtures, which are often studied by the means of optimization algorithms or thermodynamic calculations that lead to interesting results (Bederna et al., 2021, Lecompte et al., 2014). This work proposes an alternative approach. A selection methodology is used to conduct a preliminary screening to optimize the mixture choice in accordance with the targeted objectives. This methodology is applied to study cyclopentane-based mixtures. For this purpose, a large list of criteria is considered to achieve improved safety, maximized performances, ORC using more environmentally friendly fluids and respecting heat exchangers sizing while following specific technical constraints. Among these criteria, the temperature glide should be carefully taken into account: indeed, it is directly linked to the fractionating risk, which must be prevented for the good functioning of the cycle. Performing this study prior to the classical energetic analysis reduces the risk of exploring mixtures of incompatible or irrelevant fluids. This whole analysis yields a decision-making matrix, gathering selection criteria, relevant properties, and cycle performances. By adapting the different threshold of these criteria, this methodology is adaptable to large-scale ORC applications.
