Performance Study of a Hybrid Heat Pump Dryer based on Numerical Analysis and Experimental Set-up

Shamsuddeen, Mohamed Murshid; Cha, Dong-An; Kim, Seon-Chang; Kanemoto, Toshiaki; Kim, Jin‐Hyuk

doi:10.1007/s11630-020-1384-1

Cited by 8 publications

(3 citation statements)

References 15 publications

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“…The ability to control the temperature of the drying air and humidity while recovering energy from exhaust are the primary advantages of heat pump dryers. Numerous studies have shown the importance of heat pump dryers for drying different heat sensitive products for example therapeutic plants, vegetables and fruits 28–31 . The purpose of this study is therefore to qualitatively and quantitatively review the various types of heat pump dryers that have recently been developed.…”

Section: Introductionmentioning

confidence: 99%

“…Numerous studies have shown the importance of heat pump dryers for drying different heat sensitive products for example therapeutic plants, vegetables and fruits. [28][29][30][31] The purpose of this study is therefore to qualitatively and quantitatively review the various types of heat pump dryers that have recently been developed. The first part deals with the operation of these various heat pump dryers from the key performance indicators that define the drying kinetics and the energy analysis.…”

Section: Introductionmentioning

confidence: 99%

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Comprehensive assessment of heat pump dryers for drying agricultural products

Loemba

Kichonge

Kivevele

2022

Energy Science & Engineering

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Fruits and vegetables are agricultural products that require preservation to enhance and protect shelf life, encapsulate natural flavour, and retain nutritional content. Globally, agricultural products are preserved by a range of means, the most prevalent of which is the heat pump dryer, which produces the best results even in unfavourable climatic conditions. Heat pump dryers come in different types and their performance varies depending on the type. This study aims to evaluate recently developed heat pump dryers based on key performance indicators, impacts on food colour and nutritional content, techno‐economic, exergoeconomic, and environmental issues associated with the development of heat pump dryers, which are underrepresented in most of the existing heat pump dryers' reviews. This study also discusses mathematical drying kinetic models, and regulation or policy aspects related to the development of heat pump dryers. In the present study, the results on performance analysis indicate that heat pump dryers examined were effective in reducing drying time and obtaining high coefficients of performance ranging from 1.94 to 5.338 and specific moisture extraction rate ranging from 0.156 to 9.25 kg/kWh, as well as significantly reducing energy consumption by up to 80%. The nutritional composition and colour results show that heat pump dryers maintain the maximum nutrient content while also improving colour. The expansion valve has the lowest exergoeconomic factor of all heat pump dryer components, whereas the compressor has the highest cost of exergy destruction in general, according to the results of exergoeconomic analysis. Techno‐economic analysis results demonstrated that most developed heat pump dryers have short payback periods ranging from 1.6 to 3.6 years. However, due to a lack of research in this field, the environmental implications of heat pump dryers are unknown. As per the findings of this study, future research in this field should focus on the design of simple and low‐energy heat pump dryers, life cycle, techno‐economic, and exergoeconomic assessments.

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Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Comprehensive assessment of heat pump dryers for drying agricultural products

Loemba

Kichonge

Kivevele

2022

Energy Science & Engineering

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“…Luo [13] used air-deflectors on the drying chamber's internal sidewalls to enhance the heat and mass transfer between the conveyor sludge and circulating airflow. Shamsuddeen [14] concluded that the front discharge in a hybrid heat pump dryer has better flow uniformity and lower power consumption in sea cucumber and oyster drying. Xu et al [15] simulated the air distribution in the square heat pump drying cabinet and Energies 2021, 14, 6358 2 of 19 added an inlet baffle to improve the uniformity of air distribution near the material layer.…”

Section: Introductionmentioning

confidence: 99%

Simulation Study on Active Air Flow Distribution Characteristics of Closed Heat Pump Drying System with Waste Heat Recovery

Zhao

Jing-feng

2021

Energies

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A tridimensional turbulent flow model is established for a closed heat pump drying system with waste heat recovery to improve the drying air flow characteristics and reduce the energy consumption of air circulation. The active flow distribution mode is introduced to guide air flowing in the system’s drying cabinet, top air duct, mixing zone, and heat pump. It is found that the wind velocity in the cabinet’s supply channel is greater than that in the return channel, the velocity distribution in the top duct is uneven, and the outlet velocity of the bypass fan is high and a vortex forms. A partition panel added in the top duct and modulating fans in the drying cabinet are proposed to solve these problems. The simulation results show that removing the circulating fan, changing the volume flow of the bypass fan, adopting the alternative operation mode of the bypass fans, reducing the air volume flow of the supply fan, and reducing the total pressure of the fans can improve the dry air velocity uniformity in the drying cabinet and reduce the energy consumption of the fans. This paper analyzes the closed-loop drying air flow characteristics of the active flow distribution system in the heat pump drying system, which lays a foundation for the wind velocity, temperature, and humidity regulating of heat pump drying system with waste heat recovery.

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