CFD Parametric Studies for Global Performance Improvement of Open Refrigerated Display Cabinets

Gaspar, Pedro Dinis; Gonçalves, Luís Carlos Carrilho; Pitarma, Rui

doi:10.1155/2012/867820

Cited by 13 publications

(7 citation statements)

References 19 publications

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“…This situation occurs not only in this sector. Incorrect logistics practices using cold chambers are transversal to all the agri-food sector [57,58].…”

Section: Implementation Of 5s and Kaizenmentioning

confidence: 99%

Lean Optimization Techniques for Improvement of Production Flows and Logistics Management: The Case Study of a Fruits Distribution Center

2022

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The organizations of horticultural producers and, particularly, those that deal with extremely perishable endogenous fruits, such as peaches and cherries, have a greater need to optimize production flows and processes. A particularity of the horticultural industry is the short shelf life of raw materials and the seasonality of products. In this paper, optimization techniques are used to improve the production flows and the management of cold storage and distribution in a fruit central. The application of Lean tools allowed reducing the cycle time by 4.37 min and the lead time by 7.10 min of the whole process, i.e., a reduction of 35.5% and 10.6% of the cycle time and lead time, respectively, excluding the cold conservation operation. The study shows that it is possible to reduce, or even eliminate, waste throughout the process, reduce unnecessary movement, adapt the layout, maximize workspace, and level stocks, as well as greater supplier involvement in a continuous improvement approach. This approach can be outlined as a good practice for the optimization of productive flows and management logistics that may benefit productivity, energy efficiency, human resources distribution, food quality, and reduce food waste.

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“…This situation occurs not only in this sector. Incorrect logistics practices using cold chambers are transversal to all the agri-food sector [57,58].…”

Section: Implementation Of 5s and Kaizenmentioning

confidence: 99%

Lean Optimization Techniques for Improvement of Production Flows and Logistics Management: The Case Study of a Fruits Distribution Center

2022

Self Cite

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“…In such circumstances, the rest of the air flow would penetrate from the back flow channel into the cabinet through a perforated back panel. The interaction between air flows surrounding the cabinet will significantly affect cabinet performance and food storage; however, this could be evaluated by using validated CFD modelling technology and thus optimising the designs [6,7]. A validated cabinet model could be an efficient tool to examine cabinet performance, conduct optimal designs and most importantly, imitate actual cabinet operation.…”

Section: U N C O R R E C T E D P R O O Fmentioning

confidence: 99%

“…In addition, turbulent flow assumption is made for the flow regime and the standard k-ɛ two-equation model was applied [14] as listed in Eqs. (5) and (6). The discrete ordinates method (DO) is used to simulate the coupling of radiation and convection heat transfers [15].…”

Section: Assumptions and Boundary Conditionsmentioning

confidence: 99%

The novel use of phase change materials in an open type refrigerated display cabinet: A theoretical investigation

Alzuwaid

Tassou

et al. 2016

Applied Energy

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In this paper, 2D CFD models have been developed for a prototype refrigerated open type multi-deck display cabinet with and without integrated phase change material (PCM). The models can predict the effect of adding a PCM container on cabinet efficiencies, air temperature distributions, product temperatures and air flow patterns inside the cabinet at a range of operating conditions including space air temperatures and evaporator air velocities. To validate the cabinet models, the prototype cabinet was mounted in an air conditioned chamber and extensive experiments were conducted at constant space air temperature and relative humidity. The cabinet models have therefore been validated through comparison with experiment results for air temperatures at different locations of the airflow path and of food products. Simulation results show that significant energy can be saved through the installation of a PCM container. Further benefits include greater stabilization of product temperatures during defrost periods for the modified display cabinet. Consequently, the validated models can be used to explore and analyse the cabinet performance and control strategies at various operating and design conditions.

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“…In light commercial systems, heat exchangers (HXs) with a large area-to-volume ratio are particularly susceptible to frost accumulation on fin surfaces under subfreezing temperature conditions [1][2][3]. The presence of frost acts as a thermal barrier, reducing thermal performance and restraining heat transfer between air and refrigerant [4,5], besides increasing the energy consumption [6][7][8]. The influence of frost should be taken into account during the design and dimensioning of the HX, as without an appropriate design and defrosting method, the buildup of frost restricts or even blocks airflow between fins, resulting in increased energy consumption, lower performance, degradation of refrigeration conditions, decreased product safety and quality, or even system damage [9,10].…”

Section: Introductionmentioning

confidence: 99%

Optimized Placement of Frost-Measuring Sensors in Heat Exchangers via Image Processing of Frost Formation Pattern

Aguiar

Gaspar

Silva

2023

Sensors

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Heat exchangers (HXs) play a critical role in maintaining human thermal comfort and ensuring product safety and quality in various industries. However, the formation of frost on HX surfaces during cooling operations can significantly impact their performance and energy efficiency. Traditional defrosting methods primarily rely on time-based control of heaters or HX operation, overlooking the actual frost formation pattern across the surface. This pattern is influenced by ambient air conditions (humidity and temperature) and surface temperature variations. To address this issue, frost formation sensors can be strategically placed within the HX. However, the non-uniform frost pattern poses challenges in sensor placement. This study proposes an optimized sensor placement approach using computer vision and image processing techniques to analyze the frost formation pattern. Through creating a frost formation map and evaluating various sensor locations, frost detection can be optimized to control defrosting operations with higher accuracy, thereby enhancing the thermal performance and energy efficiency of HXs. The results demonstrate the effectiveness of the proposed method in accurately detecting and monitoring frost formation, providing valuable insights for sensor placement optimization. This approach presents significant potential in enhancing the overall performance and sustainability of the operation of HXs.

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CFD Parametric Studies for Global Performance Improvement of Open Refrigerated Display Cabinets

Cited by 13 publications

References 19 publications

Lean Optimization Techniques for Improvement of Production Flows and Logistics Management: The Case Study of a Fruits Distribution Center

Lean Optimization Techniques for Improvement of Production Flows and Logistics Management: The Case Study of a Fruits Distribution Center

The novel use of phase change materials in an open type refrigerated display cabinet: A theoretical investigation

Optimized Placement of Frost-Measuring Sensors in Heat Exchangers via Image Processing of Frost Formation Pattern

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