Revista UIS Ingenierías

Vol. 22 No. 3 (2023): Revista UIS Ingenierías
Articles

Analysis of variance and variation coefficient as repeatability criteria of a cookstove based on pellets gasification

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  • Jonatan Gutiérrez,
  • Edwin Chica,
  • Juan F. Pérez
Jonatan Gutiérrez
Universidad de Antioquia
Edwin Chica
Universidad de Antioquia
Juan F. Pérez
Universidad de Antioquia
DOI: https://doi.org/10.18273/revuin.v22n3-2023009

Published 2023-07-28

Keywords

  • improved biomass cookstoves,
  • wood pellets,
  • statistical repeatability,
  • water boiling test protocol,
  • variation coefficient,
  • analysis of variance
    • ...More
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How to Cite

Gutiérrez, J. ., Chica, E., & Pérez , J. F. . (2023). Analysis of variance and variation coefficient as repeatability criteria of a cookstove based on pellets gasification. Revista UIS Ingenierías, 22(3), 115–134. https://doi.org/10.18273/revuin.v22n3-2023009

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Abstract

In this work is presented a repeatability study applied to a cookstove based on wood pellets gasification (19.03 MJ/kg). The analysis is carried out under a modified water boiling test (WBT 4.2.3). The repeatability of the gasification-based cookstove was assessed by means of two methodologies, such as the variation coefficient (CV, %) and the analysis of variance (ANOVA). The answer variables evaluated under repeatability were the efficiency ( , %), power (P, kW), fuel consumption (FC, g/min), fuel specific consumption (SFC, g/L), energy specific consumption (SFEC, kJ/L), and energy specific consumption per unit time (SFCT, kJ/L-min). By the CV analysis, the global average CV was 4.69% ± 0.87%. Therefore, as CV ≤ 5%, it is concluded that the gasification based cookstove is statistically repeatable. Concerning the ANOVA, the P-values of the variables studied were higher than 0.05 (P>0.05), thereby, it is stated that the improved cookstove is repeatable with a confidence level of 95%. Consequently, it is highlighted that the average thermal efficiency reached by the cookstove is ~29% ± 2.25%, with a confidence level of 95%. This thermal efficiency value is comparable with other biomass cookstoves based on gasification reported in the literature with values between 16 and 38%. The methodology and the results of this work constitute a theoretical foundation for assessing future developments of biomass cookstoves since the results reliability found in the prototypes tested at the laboratory level can be quantified and analyzed.

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