Experimental study of heat transfer and air flow in a refrigerated display cabinet

Laguerre, Onrawee; Hoang, Hong-Minh; Osswald, Véronique; Flick, Denis

doi:10.1016/j.jfoodeng.2012.05.027

Cited by 45 publications

(11 citation statements)

References 21 publications

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“…Likewise, as the air flowed down towards the bottom of the refrigerator its temperature decreased resulting in condensation on the food products in this region. Further work by Laguerre et al (2012) uses PIV to measure the air velocity profiles in a vertical open refrigerated display cabinet. The results showed the highest air velocity near the air supply and return ducks.…”

Section: Refrigerated Display Cabinets/domestic Refrigeratorsmentioning

confidence: 99%

Airflow measurement techniques for the improvement of forced-air cooling, refrigeration and drying operations

O’Sullivan

Ferrua

Love

et al. 2014

Journal of Food Engineering

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Flowrate and distribution of air is a critical design factor in the cooling, refrigeration and drying of horticultural food products. These operations rely on a constant supply of air distributed throughout bulk arrangements of the produce. Local distribution of the air is critical to optimizing the design and efficiency of these processes. Identification of the key parameters affecting the airflow distribution has been done either experimentally (using intrusive point-wise or bulk measurement techniques) or numerically. The detailed information provided by the use of computational fluid dynamic models has facilitated unique opportunities to investigate alternative system designs, without the need for expensive and time consuming experiments. This study provides a review of the techniques available to measure airflow (thermal and rotatory vane anemometry, pressure differential devices, tracer gases, LDA and PIV). Their advantages and disadvantages (accuracy, resolution, application range, cost, and ease of use) as well as their application in the validation of numerical models are reviewed. The novel and scientifically based design guidelines developed by a better understanding of the airflow behaviour within the system for each of the operations under study are also presented.

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Section: Refrigerated Display Cabinets/domestic Refrigeratorsmentioning

confidence: 99%

Airflow measurement techniques for the improvement of forced-air cooling, refrigeration and drying operations

O’Sullivan

Ferrua

Love

et al. 2014

Journal of Food Engineering

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“…It is well known that air infiltration across an air curtain is one of the major drawbacks of open refrigerated display cabinets. It accounts for about 66-77% of total refrigeration loads (Gaspar et al, 2011) and also causes temperature heterogeneity in the cabinets (Laguerre et al, 2012b). High temperature is mostly at the front areas and low temperature at the rear (Evans et al, 2007).…”

Section: Introductionmentioning

confidence: 99%

A simplified heat transfer model of a closed refrigerated display cabinet

Chaomuang

Laguerre

Flick

2020

Thermal Science and Engineering Progress

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A simplified heat transfer model for a closed refrigerated display cabinet was developed based on a zonal approach. The developed model allows the prediction of time-averaged air and load temperatures at various positions in the display cabinet. These predicted values were compared with measured air and load temperatures. Good agreement was found between them with the maximum difference of 0.5°C for every studied position and the overall mean absolute error of 0.2°C. Air and load temperatures vary with positions. High temperature was observed at the front (highest value at the front top) and low at the back (lowest value at the back bottom). Based on the simulation, the cabinet thermal performance can be enhanced by minimizing the size of door gaps.

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“…Omni-directional hot film anemometers were used for air speed measurements in cold stores, because of the unknown flow direction at the measuring points in gaps between product bins and above the bin stacks [ 10 , 11 , 12 ]. Laguerre et al [ 13 ] measured the air velocity with hot wire anemometers in the homogenized airflow in a supply air duct and in the air curtain of a display cabinet for cooling food packages in retail. Hot wire anemometers are not suitable for complex situations with high fluctuations [ 13 ] or airflow measurements inside packages or bulks because of the size of the probes up to 0.5 m length [ 14 ].…”

Section: Introductionmentioning

confidence: 99%

“…Laguerre et al [ 13 ] measured the air velocity with hot wire anemometers in the homogenized airflow in a supply air duct and in the air curtain of a display cabinet for cooling food packages in retail. Hot wire anemometers are not suitable for complex situations with high fluctuations [ 13 ] or airflow measurements inside packages or bulks because of the size of the probes up to 0.5 m length [ 14 ]. Alvarez and Flick [ 15 ] and Delele et al [ 16 ] studied air velocity and turbulence distribution inside vented bins for agricultural products with hot wire anemometer measurements.…”

Section: Introductionmentioning

confidence: 99%

“…Therefore, measuring points can be chosen only in gaps or above the products but not inside packages or bulks. Air velocity fields were determined with PIV in the air curtain in front of a display cabinet [ 13 ]. The measurement agreed well with measurements of a hot wire anemometer in zones of uncomplex flow conditions at the internal side of the curtain.…”

Section: Introductionmentioning

confidence: 99%

See 1 more Smart Citation

Measuring Device for Air Speed in Macroporous Media and Its Application Inside Apple Storage Bins

Geyer

Praeger

Truppel

et al. 2018

Sensors

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In cold storage facilities of fruit and vegetables, airflow is necessary for heat removal. The design of storage facilities influences the air speed in the surrounding of the product. Therefore, knowledge about airflow next to the product is important to plan the layout of cold stores adapted to the requirements of the products. A new sensing device (ASL, Air speed logger) is developed for omnidirectional measurement of air speed between fruit or vegetables inside storage bins or in bulk. It consists of four interconnected plastic spheres with 80 mm diameter each, adapted to the size of apple fruit. In the free space between the spheres, silicon diodes are fixed for the airflow measurement based on a calorimetric principle. Battery and data logger are mounted inside the spheres. The device is calibrated in a wind tunnel in a measuring range of 0–1.3 m/s. Air speed measurements in fruit bulks on laboratory scale and in an industrial fruit store show air speeds in gaps between fruit with high stability at different airflow levels. Several devices can be placed between stored products for determination of the air speed distribution inside bulks or bin stacks in a storage room.

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Experimental study of heat transfer and air flow in a refrigerated display cabinet

Cited by 45 publications

References 21 publications

Airflow measurement techniques for the improvement of forced-air cooling, refrigeration and drying operations

Airflow measurement techniques for the improvement of forced-air cooling, refrigeration and drying operations

A simplified heat transfer model of a closed refrigerated display cabinet

Measuring Device for Air Speed in Macroporous Media and Its Application Inside Apple Storage Bins

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