Experimental energy‐exergy performance and kinetics analyses of compact dual‐mode heat pump drying of food chips

Singh, Akhilesh Kumar; Sarkar, Jahar; Sahoo, Rashmi Rekha

doi:10.1111/jfpe.13404

Cited by 22 publications

(11 citation statements)

References 27 publications

(33 reference statements)

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“…

where

is the effective moisture diffusivity coefficient (m 2 s −1 ), L is half the thickness of a plantain banana slice (m), t is time (s), and n is a positive integer ( n = 0). Thus, for a long drying period, it can be simplified to Equation (8) from Equation (7) [ 25 ]. The constant thickness of slices was assumed to have a larger surface area on the cut slices than the peripheral area, resulting in uniform moisture distribution, constant diffusivity, and negligible external resistance and shrinkage [ 25 ].…”

Section: Methodsmentioning

confidence: 99%

Semi-Empirical Mathematical Modeling, Energy and Exergy Analysis, and Textural Characteristics of Convectively Dried Plantain Banana Slices

Kamble

Singh

Kumar

et al. 2022

Foods

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Thin-layer convective drying of plantain banana was performed at four different temperatures from 50 to 80 °C, with slice thicknesses from 2 to 8 mm. The drying curves, fitted to seven different semi-empirical mathematical models, were successfully used to fit experimental data (R2 0.72–0.99). The diffusion approach had better applicability in envisaging the moisture ratio at any time during the drying process, with the maximum correlation value (R2 0.99) and minimum value of x2 (2.5×10−5 to 1.5×10−4) and RMSE (5.0 ×10−3 to 1.2×10−2). The Deff, hm, and Ea values were calculated on the basis of the experimental data, and overall ranged from 1.11×10−10 to 1.79×10−9 m2 s−1, 3.17×10−8 to 2.20 ×10−7 m s−1 and 13.70 to 18.23 kJ mol−1, respectively. The process energy consumption varied from 23.3 to 121.4 kWh kg−1. The correlation study showed that the drying temperature had a close correlation with hm value and sample hardness. A significant (p < 0.05) increase in hardness of dried plantain banana was observed at 80 °C compared to the other temperatures. Additionally, the sample hardness and process energy consumption were more positively correlated with the thickness of the samples.

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“…

where

Section: Methodsmentioning

confidence: 99%

Semi-Empirical Mathematical Modeling, Energy and Exergy Analysis, and Textural Characteristics of Convectively Dried Plantain Banana Slices

Kamble

Singh

Kumar

et al. 2022

Foods

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“…The photograph of the developed experimental facility for the WHR‐assisted HPD system is shown in Figure 2. Detailed descriptions of the heat pump and dryer system have been provided in an earlier publication by the authors (Singh, Sarkar, & Sahoo, 2020b). The heat pump system consists of condenser, compressor, expansion device, and evaporator.…”

Section: Methodsmentioning

confidence: 99%

“…SMER (ratio of the amount of moisture removed to the energy required) is given as,

SMER = \frac{m_{w}}{t_{d} false(W_{compressor} + W_{fan} + W_{pump} false)}

MER (moisture removal rate from the drying material) is given as (Singh et al., 2020a),

MER = \frac{m_{w}}{t_{d}}

SEC of the drying system is given by,

SEC = \frac{t_{d} false(W_{compressor} + W_{fan} + W_{pump} false)}{m_{w}}

Drying efficiency of the HPD is given by,

D E = \frac{()(, ω_{5 a} ‐ ω_{4 a})}{()(, ω_{sat} ‐ ω_{4 a})} = \frac{()(, T_{4 a} ‐ T_{5 a})}{()(, T_{4 a} ‐ T_{sat})}

Moisture content (wet basis) is given using (Singh et al, 2020b),

{()(, M_{t})}_{db} = \frac{m_{italicpt} ‐ m_{d}}{m_{pt}}

Exergy flow rate at any state point for refrigerant, humid air, and water is evaluated by, (Singh et al., 2019),

E x_{r} = {\overset{m}{true}}_{r} \{(h ‐ h_{0}) ‐ T_{0} (s ‐ s_{0})\}

…”

Section: Methodsmentioning

confidence: 99%

Experiment on waste heat recovery‐assisted heat pump drying of food chips: Performance, economic, and exergoeconomic analyses

Singh

Sarkar

Sahoo

2020

J Food Process Preserv

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Novel waste heat recovery‐assisted heat pump dryer is designed, developed, and experimented in different operating modes. Energy, exergy, economic, and exergoeconomic parameters of the dryer with and without waste heat recovery are experimentally compared. Radish chips are dried to remove moisture from 93.5% to 10.5% at fixed dryer inlet air velocity. Both energy and exergy efficiencies are found highest for the waste heat recovery‐assisted (hybrid) system (56.26% and 35.9%, respectively). Specific moisture extraction rate (2.4 kg/kWh) and coefficient of performance (6.72) are highest for the hybrid system. The payback period for the hybrid system over the simple system is 33 months. The lowest exergoeconomic factor is for expansion devices in both simple and hybrid systems (0.0918 and 0.1348, respectively). Total exergy destruction costs for simple and hybrid systems are 0.10148 and 0.1266 $/h, respectively. The most important component that needs to improve based on the exergoeconomic factor is the drying chamber. Practical applications In the present study, a novel heat pump dryer assisted with waste heat recovery from the diesel engine is designed and developed. Various energy, exergy, economic, and exergoeconomic performance parameters with and without waste heat recovery are experimentally compared. To check the applicability, the radish chips have been dried to remove moisture from 93.5% to 10.5% at fixed dryer inlet air velocity. The testing shows that the proposed system is superior as compared to the simple heat pump dryer in terms of both energy and exergy efficiencies, specific moisture extraction rate, and overall heating coefficient of performance. The payback period for the proposed system over a simple one is found 3 years approximately. The proposed system can be a futuristic and promising solution for the drying applications, which satisfies two purposes: An effective way to utilize the engine waste heat and superior system performance.

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“…Moreover, HP drying is advantageous over conventional hot air drying due to its high drying efficiency, produce high-quality dried products, and high throughput, as identified by Chua et al (2010) and Goh et al (2011). As a result, HP drying is a widely used drying method applicable for agricultural products such as grains, fruits, vegetables, and condiments (Yousaf et al, 2020;Fernando et al, 2021;Singh et al, 2020;Venkatachalam et al, 2020).…”

Section: Introductionmentioning

confidence: 99%

Pulse-Width-Modulation Control of a Heat Pump Dryer with Cascade Evaporators and Parallel-Flow Condensers

et al. 2021

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Heat pump drying systems require a method to change the inflow air temperature of the drying chamber. Pulse-widthmodulation (PWM) technique with duty cycle provides a measure of controlling the voltage supplied to the electric motors. Therefore, we conducted this research to PWM control a heat pump dryer to change the air circuit parameters. In the Parallel-Flow condensers, inlet and outlet temperatures, and relative humidity, data were collected, and the average temperature values were recorded. The duty cycle was changed by developing a program using the Python programming language. An Excel-based psychrometric calculator was developed to analyze the collected data. The average condenser outlet temperatures were 56.6±0.1 ℃, 54.9±0.1 ℃, and 52.6±0.1℃, and the average condenser inlet temperatures were 43.2±0.0 ℃, 42.8±0.1 ℃, and 41.2±0.1 ℃ for 60%, 80%, and 100% duty cycles, respectively. The power consumption rate of the condenser reduced with an increasing duty cycle. The results concluded that the PWM control system is a viable method to control the inflow air temperature to the drying chamber.

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Experimental energy‐exergy performance and kinetics analyses of compact dual‐mode heat pump drying of food chips

Cited by 22 publications

References 27 publications

Semi-Empirical Mathematical Modeling, Energy and Exergy Analysis, and Textural Characteristics of Convectively Dried Plantain Banana Slices

Semi-Empirical Mathematical Modeling, Energy and Exergy Analysis, and Textural Characteristics of Convectively Dried Plantain Banana Slices

Experiment on waste heat recovery‐assisted heat pump drying of food chips: Performance, economic, and exergoeconomic analyses

Pulse-Width-Modulation Control of a Heat Pump Dryer with Cascade Evaporators and Parallel-Flow Condensers

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