Thermal Analysis And Pressure Loss Modeling For An Optimized Heat Exchanger Used In A Recuperated Co2 Power Cycle

Keywords

Brayton cycle; Compact heat exchanger; Recuperator; Supercritical carbon dioxide

Abstract

A simple recuperated cycle is studied and optimized in thispaper. Geometrical parameters for a novel recuperator designare then optimized to minimize area density. The recuperator iswhere the s-CO2 is analyzed and simulated for both hot and coldsides. The design of the cycle is obtained through a study of a100 MW net power output s-CO2 cycle, where this cycle featuresa turbine inlet temperature of 1023 K. The main objective of thispaper is to couple a recuperated cycle with a heat exchanger.This is done through Pareto optimality to study the tradeoffsbetween conflicting variables. The geometry of the heatexchanger features two inlet headers attached to semirectangular channels. The thermal analysis used is based onone-dimensional finite enthalpy method, where discretization ismade by equal heat transferred per element. In addition,pressure drops are calculated at both sides of main heatexchanger body. Optimized cycle based on practical parametricassumptions reveals an efficiency of 45.8% and specific powerof 132.1 kJ/kg. Best design reveals channel side length of 7 mmwith surrounding solid sidewall thickness of 1 mm. Pressuredrops for the proposed design are 4.8% and 0.6% of the initialpressure for the hot and the cold sides, respectively. Overalllength of the heat exchanger is found to be 10.7 m with aneffectiveness of 96.2% and an area density of 363 m2/m3.

Publication Date

1-1-2018

Publication Title

Proceedings of the ASME Turbo Expo

Volume

9

Document Type

Article; Proceedings Paper

Personal Identifier

scopus

DOI Link

https://doi.org/10.1115/GT2018-76975

Socpus ID

85053897546 (Scopus)

Source API URL

https://api.elsevier.com/content/abstract/scopus_id/85053897546

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