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A universal approach is necessary for assessing the effectiveness of solar dryers when functioning under varying modes—direct, indirect, and mixed flow. To achieve this, a heat balance-centered steady-state model proves essential for computing the no-load performance index (NLPI) parameter. This non-dimensional metric offers a fundamental gauge of the dryer's efficacy. In the current study, the NLPI of a solar greenhouse dryer, operating via natural convection, has been evaluated across three distinct bed conditions. The variance in NLPI across these conditions stems from measurement errors and the limitations of least count precision. Additionally, an investigation into the dryer's thermal efficiency has been conducted under diverse bed conditions.

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Assessment of Solar Dryer Performance via No-Load Performance Index and Thermal Efficiency in Various Operating Modes

  • 会议论文

  • 发表日期：

    2026年

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  • Asim Ahmad,
  • Om Prakash,
  • Rukaiya Kausher,
  • Kapil Kumar,
  • Man ish Kumar

摘要

A universal approach is necessary for assessing the effectiveness of solar dryers when functioning under varying modes—direct, indirect, and mixed flow. To achieve this, a heat balance-centered steady-state model proves essential for computing the no-load performance index (NLPI) parameter. This non-dimensional metric offers a fundamental gauge of the dryer's efficacy. In the current study, the NLPI of a solar greenhouse dryer, operating via natural convection, has been evaluated across three distinct bed conditions. The variance in NLPI across these conditions stems from measurement errors and the limitations of least count precision. Additionally, an investigation into the dryer's thermal efficiency has been conducted under diverse bed conditions.