IntroductionHejzlar et al. [1] have identified the recompression supercrit-ical CO2Brayton cycle (S-CO2) as a promising power conversionsystem for some Generation IV fission reactors (sodium fast reac-tor). This type of cycle has been also proposed for fusion reactorsbecause, besides of the aspects of high efficiency, CO2exhibits cer-tain advantages in terms of tritium recovery. Although it can bedissociated to CO under heavy neutron irradiation and tritium per-meation into CO2could react with it, its separation is easier than forwater [2]. On this basis, a domestic R&D program called TECNO FUS[3] was launched in Spain in 2009 to support technological devel-opments related to a specific concept of dual-coolant (He/Pb–Li)∗Corresponding author. Tel.: +34 91 542 28 00; fax: +34 91 559 65 69.E-mail address: linares@upcomillas.es (J.I. Linares).breeding blanket for fusion reactors based on Model C configurationfor fusion Power Plant Concept (PPCS) [4].The S-CO2 cycle has been already analyzed by Angelino [5]. It is aBrayton cycle with CO2as working fluid and with two recuperators,one at low temperatures (LTR) and another at high temperatures(HTR). Serrano et al. [6] developed a variant of S-CO2 cycle, des-ignated as REC3 (three recuperators), with one more recuperator(BBR) and with an efficiency higher than 46%. Further investigationslead to a new improved one, designated as REC2, in which HTR issuppressed and thus BBR assumes its thermal load. So, this newdesign includes two recuperators, as in classical S-CO2, but withthe same efficiency than in REC3 [7]. Fig. 1 shows the new recuper-ator BBR included in both REC2 and REC3 designs and integratedin the classical S-CO2 cycle. The REC2 design has been proposed asthe power cycle for TECNO FUS fusion reactor.The main goal of this paper is to describe the methodology fol-lowed for the design of the different heat exchangers of the REC2
IntroductionHejzlar et al. [1] have identified the recompression supercrit-ical CO2Brayton cycle (S-CO2) as a promising power conversionsystem for some Generation IV fission reactors (sodium fast reac-tor). This type of cycle has been also proposed for fusion reactorsbecause, besides of the aspects of high efficiency, CO2exhibits cer-tain advantages in terms of tritium recovery. Although it can bedissociated to CO under heavy neutron irradiation and tritium per-meation into CO2could react with it, its separation is easier than forwater [2]. On this basis, a domestic R&D program called TECNO FUS[3] was launched in Spain in 2009 to support technological devel-opments related to a specific concept of dual-coolant (He/Pb–Li)∗Corresponding author. Tel.: +34 91 542 28 00; fax: +34 91 559 65 69.E-mail address: linares@upcomillas.es (J.I. Linares).breeding blanket for fusion reactors based on Model C configurationfor fusion Power Plant Concept (PPCS) [4].The S-CO2 cycle has been already analyzed by Angelino [5]. It is aBrayton cycle with CO2as working fluid and with two recuperators,one at low temperatures (LTR) and another at high temperatures(HTR). Serrano et al. [6] developed a variant of S-CO2 cycle, des-ignated as REC3 (three recuperators), with one more recuperator(BBR) and with an efficiency higher than 46%. Further investigationslead to a new improved one, designated as REC2, in which HTR issuppressed and thus BBR assumes its thermal load. So, this newdesign includes two recuperators, as in classical S-CO2, but withthe same efficiency than in REC3 [7]. Fig. 1 shows the new recuper-ator BBR included in both REC2 and REC3 designs and integratedin the classical S-CO2 cycle. The REC2 design has been proposed asthe power cycle for TECNO FUS fusion reactor.The main goal of this paper is to describe the methodology fol-lowed for the design of the different heat exchangers of the REC2
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