The New Use of Diffusion Theories for the Design of Heat Setting Process in Fabric Drying

Ip, Ralph W.L.; Wan, Elvis Iok Cheong

doi:10.5772/48484

Cited by 6 publications

(1 citation statement)

References 17 publications

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“…In this period, the highest average value of the drying speed was also reached, being 0.023 ± 0.001 g water/g dry solid * minute. This period can be seen in Figure S1 (Supplementary Materials) between 11:50 and 18:10 h (380 min), this last hour being where the critical moisture (Mc) of the process was established, 2.01 g of water/g of dry solid (Figure 3), which is defined by the end of the constant drying rate period and the start of the falling drying rate period [50], showing the fitted straight line MR = −0.0019 Dt + 1.1071 (R 2 = 0.9941) of the constant rate period (Figures 2 and 3). rate period began, and the drying rate progressively decreased until equilibrium, reaching mean values of 0.00045 g water/g dry solid*min and final moisture, called equilibrium moisture (Meq), with mean values of 0.129 g of water/g of dry solid (Figure 3).…”

Section: Drying Rate Curvementioning

confidence: 99%

Drying of Carrot Strips in Indirect Solar Dehydrator with Photovoltaic Cell and Thermal Energy Storage

Mezquita

Bugueño-Muñoz

2022

Sustainability

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Minimizing agricultural losses, accompanied by employing technologies capable of taking advantage of solar energy, are the current challenges of the Antofagasta region of Chile due to having an average solar irradiance of 7.2 kWh/m2 per day. With this objective, using an indirect solar dryer with storage of thermal energy in the form of sensible heat, the effect of drying on the quality of carrot strips was studied using chromatic coordinates CIEL*a*b*, the color difference (ΔE), the relationship between redness/yellowness (R = a*/b*), browning index (BI), whiteness index (WI), chroma (C), hue angle (h°) and drying kinetics. The experimental drying data were fitted to 15 typically employed nonlinear regression models. The ΔE = 14.11 ± 0.14 between the carrots in the dry and fresh conditions represented a detectable color change, the R ratio increased from 0.75 to 0.89, the BI index decreased from 209.82 ± 0.62 to 148.38 ± 0.26 and the WI index increased from 24.5 ± 0.11 to 31.8 ± 0.17, indicating color affectations due to the process. The coefficients of determination, (R2) close to 1 and the values closest to 0 of χ2, SSE and RMSE, led to the best fit corresponding to the Weibull distribution model. In addition, it was found that the operation of the drying installation in the hours without incident solar radiation maintained the drying temperature values throughout the process.

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Section: Drying Rate Curvementioning

confidence: 99%