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<p>The study considers the thermodynamic performance and thermal flux effect of a passive evaporative cooled porous clay storage structure on tomatoes precooling. To keep the construction cost-effective, the pilot precooling structure is made with clay soil collected from the immediate area. Water flow rate, air speed, temperature, and relative humidity are among the operating parameters. Various thermal exchange profile on the structure were analysed, while the performance parameters includes exergy efficiency, cooling capacity, enlargement coefficient, specific water evaporation rate, and the novel developed cooling potential ratio (CPR) performance criteria determined in relation to overall thermal flux and cooling capacity. The study showed that the average thermal exchange on the structure was calculated at 237.04W/m<sup>2</sup> which includes 76.29W/m<sup>2</sup> on the walls and 160.75W/m<sup>2</sup> on the cooling pad. Similarly, exhaust air temperature for the system decreased by 273.6 to 279<sup>o</sup>K, while the relative humidity increased by 1.1 to 38.7% respectively. The obtained average specific cooling capacity was 0.21&#xa0;kW/kg, whereas the exergy efficiency ranged from 0.008 to 20.92%. However, the enlargement coefficient fluctuated between 57.4 and 96.4. The sensitivity analysis showed that the CPR varied from 0.19 to 1.4 for temperature changes between 274-280<sup>o</sup>K and was found to be effective in defining the system performance.</p> Graphical abstract <p></p>

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Performance analysis of the thermal flux effect and exergy analysis of a passive evaporative cooled double jacket wet clay-walled storage structure for pre-cooling of tomatoes

  • 期刊论文

  • 发表日期：

    2024年12月31日

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  • Macmanus Chinenye Ndukwu,
  • Godwin Akpan,
  • Cyprian N. Tom,
  • Ubong David Offiong,
  • Samuel Nditoi Akpanmkpuk,
  • Emmanuel Oluwafemi Ogundahunsi,
  • Ifiok Ekop,
  • Leonard Akuwueke,
  • Godwin Usoh,
  • Joseph Edet,
  • Augustine Edet Ben,
  • Merlin Simo-Tagne,
  • Fidelis. I. Abam

摘要

The study considers the thermodynamic performance and thermal flux effect of a passive evaporative cooled porous clay storage structure on tomatoes precooling. To keep the construction cost-effective, the pilot precooling structure is made with clay soil collected from the immediate area. Water flow rate, air speed, temperature, and relative humidity are among the operating parameters. Various thermal exchange profile on the structure were analysed, while the performance parameters includes exergy efficiency, cooling capacity, enlargement coefficient, specific water evaporation rate, and the novel developed cooling potential ratio (CPR) performance criteria determined in relation to overall thermal flux and cooling capacity. The study showed that the average thermal exchange on the structure was calculated at 237.04W/m2 which includes 76.29W/m2 on the walls and 160.75W/m2 on the cooling pad. Similarly, exhaust air temperature for the system decreased by 273.6 to 279oK, while the relative humidity increased by 1.1 to 38.7% respectively. The obtained average specific cooling capacity was 0.21 kW/kg, whereas the exergy efficiency ranged from 0.008 to 20.92%. However, the enlargement coefficient fluctuated between 57.4 and 96.4. The sensitivity analysis showed that the CPR varied from 0.19 to 1.4 for temperature changes between 274-280oK and was found to be effective in defining the system performance.

Graphical abstract