Browsing by Keyword "Heat recovery"
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Item Experimental and numerical investigation of a novel high-temperature heat pump for sensible and latent heat delivery(2024-06-15) Ramirez, Miguel; Trebilcock-Kelly, Felipe; Corrales-Ciganda, José L.; Payá, Jorge; Hassan, Abdelrahman H.; Tecnalia Research & Innovation; SISTEMAS TÉRMICOS EFICIENTESThis paper investigates, both experimentally and numerically, the performance of a high-temperature heat pump (HTHP) prototype for steam production and thermal energy storage applications using R-1233zd(E) as a refrigerant. The main novelties of this prototype are the incorporation of an external subcooler to separate the sensible and latent heat production. Other novel points are the testing of a new variable-speed piston compressor that endures a discharge temperature of up to 160 °C, and the development of an advanced numerical model based on the components’ specifications. In this temperature range there are very few detailed studies up-to-date. The proposed HTHP was tested experimentally in 50 different working points selected based on the compressor's limits and on the general requirements for industrial applications requiring heat at high temperatures, up to 150 °C. The results show that the proposed HTHP can deliver a total heat of 38.6 kW at 148.5 °C, within a temperature lift of 66.8 K, with an electric power consumption of 10.7 kW, and with a heating coefficient of performance (COP) of 3.6. Moreover, using the external subcooler resulted in a substantial increase in the COP, which can reach 33 % compared with similar HTHPs without a subcooler. After successfully validating the HTHP model with the experimental results, extended performance maps were developed based on more than 500 possible operating conditions covering the most common steam generation and energy storage applications. Finally, four performance correlations were obtained, with an accuracy of ±10 %, hereby providing a black-box model to ease the integration of such HTHPs into dynamic simulations of industrial processes.Item Potential waste heat recovery analysis from molten steel slag: The case study of sidenor steelworks in Basauri (Spain)(American Society of Mechanical Engineers (ASME), 2020) Ortega-Fernández, Iñigo; Arribalzaga, Peru; Bielsa, Daniel; Fernández, Leixuri; Unamuno, Iñigo; TECNOLOGÍAS DE HIDRÓGENOEvery day huge amount of energy is released to the atmosphere in form of waste heat. The search of a cleaner and more efficient society, not only at industrial level but also at domestic level, should avoid this type of emissions. Steelmaking is an example of an industrial sector with high optimization potential in energy management. In this line, this work presents the main outcomes of the investigation carried out in the search of a technical solution for heat capture and reutilization from one of the main waste heat streams in the steelworks, the molten slag. For this purpose, a piping system embedded in the slag pit soil is proposed as satisfactory solution for the heat capture operation. Besides, the internal applicability of this recovered heat is also addressed. Overall, the analysis carried out allows the identification of the main process parameters that limit the heat recovery potential from the molten slag. At the same time, the investigation provides accurate results of the maximum energy that can be recovered from the slag if the proposed technology is implemented (around 306 kWht per casting, what represents the 6.3% of the total available energy). The work is completed with a preliminary techno-economic analysis to conclude with the viability assessment. This analysis shows a depreciated payback period of the proposed technology below 7 years.Item Potential Waste Heat Recovery Analysis From Molten Steel Slag: The Case Study of Sidenor Steelworks in Basauri (Spain)(2022-01) Ortega-Fernández, Iñigo; Arribalzaga, Peru; Bielsa, Daniel; Fernández, Leixuri; Unamuno, Iñigo; TECNOLOGÍAS DE HIDRÓGENOEvery day, a huge amount of energy is released into the atmosphere in the form of waste heat. The search for a cleaner and more efficient society, not only at the industrial level but also at the domestic level, should avoid this type of emissions. Steelmaking is an example of an industrial sector with high optimization potential in energy management. In this line, this work presents the main outcomes of the investigation carried out in the search of a technical solution for heat capture and reutilization from one of the main waste heat streams in the steelworks, the molten slag. For this purpose, a piping system embedded in the slag pit soil is proposed as a satisfactory solution for the heat capture operation. Besides, the internal applicability of this recovered heat is also addressed. Overall, the analysis carried out allows the identification of the maximum energy that can be recovered from the slag if the proposed technology is implemented (around 306 kWht per casting, which represents 6.3% of the total available energy). The work is completed with a preliminary techno-economic analysis which has shown a depreciated payback period of the proposed technology below 7 years.