Technoeconomic optimization of superalloy supercritical CO2 microtube shell-and-tube-heat exchangers. (5th February 2023)

• Record Type: Journal Article
• Authors: Krishna, Akshay Bharadwaj; Jin, Kaiyuan; Ayyaswamy, Portonovo S.; Catton, Ivan; Fisher, Timothy S.
• Is Part Of: Applied thermal engineering. Volume 220(2022)
• Publication Date: 2023-02-05
• Subjects: Supercritical CO2 -- Shell-and-tube heat exchanger -- Economic optimization -- Cost model -- Particle Swarm Optimization; Heat engineering -- Periodicals; Heating -- Equipment and supplies -- Periodicals; Periodicals; 621.40205
• DOI: 10.1016/j.applthermaleng.2022.119578
• Languages: English
• ISSNs: 1359-4311

Abstract

Abstract: Heat exchangers are critical components of aerospace systems and improve efficiency of operation by providing waste heat recovery. Supercritical CO 2 has emerged as a promising candidate working fluid due to its potential in increasing the power density of heat exchangers. In this paper, a generalized costing model is developed to estimate the capital costs incurred to manufacture microtube shell-and-tube heat exchangers. This model is utilized in conjunction with an accurate and efficient 2D numerical shell-and-tube heat exchanger performance prediction model to conduct optimization studies with two key objectives – minimization of cost and maximization of heat exchanger power density – on supercritical CO 2 microtube heat exchangers utilizing superalloy Haynes 282 as the solid material. A methodology is then demonstrated to optimize these heat exchangers using Particle Swarm Optimization for aerospace applications and highly compact and cost-effective optimal designs with power density around 20 kW / kg and cost per conductance less than 5 $ ⋅ K / W are obtained. Highlights: Generalized costing model for sCO 2 shell-and-tube heat exchangers. Optimization routine utilizing an accurate performance prediction model. Cost-minimized heat exchanger designs with cost per conductance as low as 3 $ ⋅ K / W . Power-density-maximized designs with power density as high as 33 kW/kg. Novel optimization methodology for aerospace applications. Highly compact ( ∼ 22 kW / kg ), low-cost (<5 $ ⋅ K / W ) heat exchanger designs.