Characterisation of Air Flow in a Commercial Cool Store Using a Carbon Monoxide Gas Tracer Technique

Amos, N.

doi:10.17660/actahortic.2005.687.37

Cited by 4 publications

(7 citation statements)

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“…This depends upon many factors including the thermal insulation of the cool room, the product's rate of respiration and the air circulation which depends on the physical layout of the cool room and the bins (Amos, 2004;East et al, 2013).…”

mentioning

confidence: 99%

Analysis of the spatiotemporal temperature fluctuations inside an apple cool store in response to energy use concerns

Ambaw

Bessemans

Gruyters

et al. 2016

International Journal of Refrigeration

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This is a PDF file of an unedited manuscript that has been accepted for publication. As a service to our customers we are providing this early version of the manuscript. The manuscript will undergo copyediting, typesetting, and review of the resulting proof before it is published in its final form. Please note that during the production process errors may be discovered which could affect the content, and all legal disclaimers that apply to the journal pertain. 0Analysis of the spatiotemporal temperature fluctuations inside an apple cool store in response to energy use concerns Alemayehu Ambaw (a, c) , Niels Bessemans (a) , Willem Gruyters (a) , Sunny George Gwanpua (a) , Ann Schenk (b) , Ans De Roeck (b) , Mulugeta A. Delele (a) , Pieter Verboven (a) , Bart M. Nicolai  It has been demonstrated that fan and refrigeration cycling works to save energy. Load shifting of controlled atmosphere stores for saving energy costs seems worthwhile. AbstractEnergy cost concerns have led to question the temperature and air flow regimes in cool store facilities. In this paper, a CFD model of the air flow and temperature dynamics inside an apple fruit Page 1 of 33 1 cool store was developed, validated and used to analyse energy cost saving alternatives. Load shifting was attempted by cycling the temperature set point between 1.2 °C and 0.6 °C following a day/night regime. Discontinuous use of the cooling operation, including 12 h on / 12 h off; 10 h on / 14 h off; and 8 h on / 16 h off were also investigated. The study showed that the air circulation fan is the major source of heat load. Hence, an attempt to reduce energy cost should first deliberate on reducing the fan operation time. The study developed a generic tool to analyse temperature control options inside an apple cool store in response to energy use concerns.

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mentioning

confidence: 99%

Analysis of the spatiotemporal temperature fluctuations inside an apple cool store in response to energy use concerns

Ambaw

Bessemans

Gruyters

et al. 2016

International Journal of Refrigeration

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“…The most common tracer gas to fit these requirements is carbon dioxide (Yan et al, 2009). However, in situations where natural convection is likely to occur, such as the static cooling of horticultural produce, carbon monoxide becomes a better choice than carbon dioxide (Amos, 2005). The airflow pattern is then analysed from time profiles of gas concentration at different positions in the system.…”

Section: Tracer Gas Methodsmentioning

confidence: 99%

“…Examples of the tracer method for measuring airflow measurements in food operations include: Amin et al, 2009;Amos, 2005;Tanner et al, 2000.…”

Section: Tracer Gas Methodsmentioning

confidence: 99%

“…transparent window) must be provided to the fluid flow so the movement of the tracer particles can be recorded. Unlike the tracer gas method, LDA and PIV require an unobstructed view of the point being measured, reducing their applicability in actual food processing rooms filled with produce (Amos, 2005). This requirement has meant that although LDA and PIV have been used extensively in aerodynamics (Jeffrey et al, 2000;Raffel and Kost., 1998) and biomechanics (Gijsen et al, 1996;Lim et al, 2001) it is only recently that the techniques have been applied to complex flow systems found in food operations.…”

Section: Particle Image Velocimetrymentioning

confidence: 99%

“…An uneven airflow distribution in refrigerated rooms (Figure 4) can result in centrally located bins receiving very little airflow (Amos, 2005) and low air speeds towards the rear of the room (Delele et al, 2009a), effects that could be associated with the presence of warm spots and temperature heterogeneity within the produce. Within the last decade a number of studies have been done to better understand the relationship that exists between the distribution of the airflow within the system and the rate and uniformity of the refrigeration process.…”

Section: Room Coolingmentioning

confidence: 99%

See 2 more Smart Citations

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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Model-Based Design of Horticultural Packaging

O’Sullivan¹,

Tanner²

2017

Reference Module in Food Science

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Characterisation of Air Flow in a Commercial Cool Store Using a Carbon Monoxide Gas Tracer Technique

Cited by 4 publications

References 0 publications

Analysis of the spatiotemporal temperature fluctuations inside an apple cool store in response to energy use concerns

Analysis of the spatiotemporal temperature fluctuations inside an apple cool store in response to energy use concerns

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

Model-Based Design of Horticultural Packaging

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