Performance analysis of greenhouse dryer by using insulated north-wall under natural convection mode

An experimental investigation has been carried out on the modified greenhouse dryer with insulated north wall operating under natural convection mode of heat transfer for different floor conditions, namely ground floor, concrete floor, gravel floor, and black painted gravel floor. The terms like coefficient of diffusivity, coefficient of performance, overall heat transfer coefficient, heat loss factor, and heat utilization factor has been calculated for different floor conditions. The maximum difference between room temperature and ambient temperature was found to be 32.4°C at 13 O'clock for black painted gravel floor, followed by gravel floor, concrete floor, and ground floor which are 27, 14.1, and 11.5°C, respectively. It has been observed that the rise in the percentage of maximum room temperature in comparison to maximum ambient temperature for black painted gravel floor, gravel floor, concrete floor, and the ground floor was 50.31, 46.15, 30.1, and 26.6%, respectively at 13 O'clock. It has been found that the maximum temperature absorbed by black painted gravel bed. Hence, this type of floor condition is highly recommended for drying of low and medium moisture content type vegetables and fruits. The thermal parameters of the result obtain from the present setup was compared with the published literature, and it was found that all parameters show the similar trends; however, the present setup shows the superior performance compared to other research work.

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“…The COP is the ratio between useful energy and total energy input . This parameter is being calculated as per Equation :

COP = \frac{h_{fl} A_{fl} ((), T_{fl} - T_{rm}) - \sum_{i = 0}^{i = n} U_{i} \sum_{i = 0}^{i = n} A_{i} ((), T_{rm} - T_{amb})}{A_{fl} italicτα I_{fl}}

…”

Section: Numerical Computationcontrasting

confidence: 63%

“…The COP is the ratio between useful energy and total energy input. 23 This parameter is being calculated as per Equation (10):…”

Section: Coefficient Of Performancementioning

confidence: 99%

Thermal analysis of north wall insulated greenhouse dryer at different bed conditions operating under natural convection mode

Ahmad

Prakash

2019

Env Prog and Sustain Energy

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“…The uncertainties analysis was conducted in the continuous multistage fluidized bed dryer using Equations (25)–(27) (Chauhan & Kumar, ; Elsayed, Mekawy, & Megahed, ). The uncertainties of the instruments used for the present study was tabulated in Table .

O_{m} = \sum_{i = 1}^{n} \frac{true}{O_{i}}

V = ([], \frac{1}{((), n - 1)}) \sum_{i = 1}^{n} {(O_{i} - O_{m})}^{2}

U_{n} = \sqrt{V}

where O = observations, n = number of readings, O m = mean for the observations, i = integer, V = standard deviation, and U n = uncertainty.…”

Section: Experimental Descriptionmentioning

confidence: 99%

“…The uncertainties analysis was conducted in the continuous multistage fluidized bed dryer using Equations (25)-(27) (Chauhan & Kumar, 2016;Elsayed, Mekawy, & Megahed, 2011). The uncertainties of the instruments used for the present study was tabulated in Table 1.…”

Section: Uncertainty Analysismentioning

confidence: 99%

Energetic and exergetic analyses of Barnyard millet drying using continuous multistage fluidized bed dryer

Devani

Yelamarthi

2019

J Food Process Engineering

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Most of the exergy studies reported were in batch fluidized bed drying process. The continuous dryer plays a pivotal role in industrial usage. In this study, exergy and energy analyses of multistage fluidized bed drying of Barnyard millet with stages connected externally were examined. The dryer was operated by changing wall temperature of stages (313–328 K), air inlet velocity (1.01–1.3 m/s), downcomer height (50–70 mm), and flow rate of solids (5–10 kg/h). Drying characteristics of Barnyard millet by changing process operating conditions of the dryer, were reported and the energy utilization ratio, exergy loss and exergy efficiency of dryer were also reported. The EUR of dryer at steady state has been found to be in the range of 0.25–0.46 and the maximum exergy efficiency of dryer was observed as 0.64 and lowest as 0.371 in the continuous drying process. Practical Applications Fluidized beds offer many distinct features and advantages for processing of particulate food materials. To decrease the drying time than that for single stage dryers, continuous multistage fluidized bed dryer was introduced. Reducing moisture content from feed materials in continuous dryers while discharging continuously, helps to process large quantity of solid materials with good quality of product. Several dryers with different modifications and designs have been suggested by many earlier investigators but continuous dryers play significant role in particulate industry. The multistage dryer is designed by connecting two or more fluidized beds internally or externally, where each bed is termed as a stage. Advantages of the multistage dryer are improvement in gas–solid axial mixing, which results in good quality of product. Due to stage‐wise contact of solids with gas, dried product with uniform moisture content can be obtained.

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“…Although the OSD is unquestionably the cheapest post-harvest method, it involves many disadvantages such as deterioration of products due to dust, dirt, uncontrolled heating and discoloring of products because of Ultra-Violet rays, animals, microorganisms and so on. Post-harvest losses of the agricultural products are estimated to be about 30 -40% due to an improper method of drying [7][8]. Moreover, farmers are also lacking behind with the better drying facilities.…”

Section: Introductionmentioning

confidence: 99%

Forced Convection Drying of Indian Groundnut: An Experimental Study

2017

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Performance analysis of greenhouse dryer by using insulated north-wall under natural convection mode

Cited by 72 publications

References 22 publications

Thermal analysis of north wall insulated greenhouse dryer at different bed conditions operating under natural convection mode

Thermal analysis of north wall insulated greenhouse dryer at different bed conditions operating under natural convection mode

Energetic and exergetic analyses of Barnyard millet drying using continuous multistage fluidized bed dryer

Forced Convection Drying of Indian Groundnut: An Experimental Study

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