Reynolds-number-dependent efficiency characterization of a micro-scale centrifugal compressor using non-conventional working fluids

Valdés del Fresno, Manuel and Sebastián Herrera, Andrés and Abbas Cámara, Rubén (2018). Reynolds-number-dependent efficiency characterization of a micro-scale centrifugal compressor using non-conventional working fluids. "Energy Conversion and Management" (n. 177); pp. 224-232. ISSN 0196-8904. https://doi.org/10.1016/j.enconman.2018.09.055.

Description

Title: Reynolds-number-dependent efficiency characterization of a micro-scale centrifugal compressor using non-conventional working fluids
Author/s:
  • Valdés del Fresno, Manuel
  • Sebastián Herrera, Andrés
  • Abbas Cámara, Rubén
Item Type: Article
Título de Revista/Publicación: Energy Conversion and Management
Date: 1 December 2018
ISSN: 0196-8904
Subjects:
Freetext Keywords: Micro-scale compressor; Turbomachinery down-sizing; Low Reynolds-number; Non-conventional fluids; Reynolds-number effects
Faculty: E.T.S.I. Industriales (UPM)
Department: Ingeniería Energética
Creative Commons Licenses: Recognition - No derivative works - Non commercial

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Abstract

The selection of working fluids other than air is a key issue in improving the efficiency of new thermodynamic cycles intended for low-to-moderate temperature small power plants. The aim of this paper is to study whether the low efficiency typical of small turbomachinery is still a problem when using alternative fluids. Based on a new design of power cycles named balanced hybrid Rankine-Brayton cycles, five different fluids were selected as potential working fluids: carbon dioxide, propane, isobutane, pentafluoroethane and sulfur hexafluoride. Dimensional analysis was used to compare the performances of a micro-scale centrifugal compressor working in homologous points where the efficiency variation depends only on the Reynolds-number (Re). The influence of Re on efficiency was calculated by means of four different methods for comparative purposes. Numerical simulations were also carried out in order to validate the methodological approach proposed. The results show the efficiency variations as a function of Re for increasing fluid densities. All the non-conventional fluids studied provide better performance in terms of efficiency than air. Particularly, isobutane and propane have been identified as potential working fluids candidates for the aforementioned innovative power cycle.

Funding Projects

TypeCodeAcronymLeaderTitle
Government of SpainENE2015-70515-C2-2-RUnspecifiedUnspecifiedDISEÑO Y EVALUACION DE EQUIPOS DE CICLOS COMBINADOS SOLARES AVANZADOS

More information

Item ID: 53119
DC Identifier: http://oa.upm.es/53119/
OAI Identifier: oai:oa.upm.es:53119
DOI: 10.1016/j.enconman.2018.09.055
Official URL: https://www.sciencedirect.com/science/article/pii/S0196890418310574?via%3Dihub
Deposited by: Memoria Investigacion
Deposited on: 03 Dec 2018 16:05
Last Modified: 03 Dec 2018 16:05
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