Improvements of air flow distribution in a freezing tunnel using Airpak

Alonso, María Justo; Andresen, Trond; Frydenlund, Frode; Widell, Kristina Norne

doi:10.1016/j.profoo.2011.09.183

Cited by 12 publications

(5 citation statements)

References 6 publications

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“…The analysis of particle diffusion and deposition is performed by computational fluid dynamics (CFD) simulations with software tool ANSYS Airpak 3.0.16 [ 28 ]. In this study, incompressible flow and steady-state condition are considered and solved by Reynolds-averaged Navier-Stokes (RANS) turbulence model, which is better for calculating the indoor airflow environment [ 29 ].…”

Section: Methodsmentioning

confidence: 99%

Investigation on the cross-infection control performance of interactive cascade ventilation in multi-scenario of winter

Lan

et al. 2023

Journal of Building Engineering

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Section: Methodsmentioning

confidence: 99%

Investigation on the cross-infection control performance of interactive cascade ventilation in multi-scenario of winter

Lan

et al. 2023

Journal of Building Engineering

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“…The heat transfer coefficient, which defines the rate of heat exchange with respect to a temperature difference, is dependent on the speed of the air; typical speeds are 6–10 m/s (Footit & Lewis, ). It must be mentioned, however, that the velocity field inside the thawing chamber is highly irregular, comparable to that inside an air blast freezing chamber (Alonso, Andresen, Frydenlund, & Widell, ). Hence, the effective speeds might be smaller than the earlier mentioned 6–10 m/s.…”

Section: Methods Acting Through the Boundarymentioning

confidence: 99%

Methods for (industrial) thawing of fish blocks: A review

Backi

2017

J Food Process Engineering

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The food processing industry is facing challenges when it comes to the thawing of fish and fish products. These challenges include most importantly the quality of the product to be thawed, the profitability of the operation and to some minor degree the environmental impact of the whole operation. Without doubt, thawing (and freezing) has a large impact on the structure and other quality factors of fish. In addition, both serve as bottlenecks in the production chain with direct effects on the profitability and hence also on the environment, for example, if the thawing process takes longer than necessary, energy is wasted and the quality of the product might suffer. In this concise review, several methods for (industrial) thawing of fish are presented and discussed, mainly with respect to their technical specifications and functional principles. These methods can be divided into two main principal types, namely the ones that provide heat to the frozen fish only via its boundary layers, and the ones that generate heat also in the frozen fish's inner spatial domain. Both types come with advantages and disadvantages; however, the latter types are generally not (yet) suitable for industrial large‐scale operation. The theory, functional principles and advantages/disadvantages will be highlighted in this work. In addition, an outlook on future developments as well as proposals for further research will be provided. Practical applications Thawing of fish is a very important step in the production chain from catch to salable product. Freezing serves both as shelf‐life extension for large catches and as a possibility to dampen out seasonal fluctuations of different species to make them available all year round. However, a frozen headed and gutted fish cannot be processed further (e.g., filleted), it has to be thawed to perform further processing of the product.

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“…The first-order upwind scheme was selected for turbulent kinetic energy and turbulent dissipation rate, and the second-order upwind scheme was selected for the pressure, temperature, and momentum. The singleprecision solver and default relaxation factor were selected by referring to Alonso et al (2011). The occupants and lights were defined as solid boundary conditions, and their heat flux were set as 100 and 75 W, respectively (Kong et al 2020).…”

Section: Measuring Devicesmentioning

confidence: 99%

Thermal environment investigation of asymmetric radiation coupled with convection heating

et al. 2021

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The couple of radiation with convection heating owned advantages of less energy utilization, healthier and more comfortable indoor environment. However, local thermal discomfort was often induced by large vertical temperature difference and radiation asymmetry temperature. This work studied indoor thermal environment characteristics under different coupling ways of radiation and convection heating terminals through experiments and CFD simulation. The studied five scenarios were denoted as: (I) lateral air supply + adjacent side wall radiation, (II) lateral air supply + opposite side wall radiation, (III) lateral air supply + floor radiation, (IV) lateral air supply + adjacent side wall radiation + floor radiation, and (V) lateral air supply + opposite side wall radiation + floor radiation. The overall thermal comfort indices (including air diffusion performance index (ADPI), predicted mean vote (PMV), and predicted percent of dissatisfaction (PPD)) and local thermal comfort indices under different scenarios were investigated. For Scenarios I-III, the local dissatisfaction rates caused by vertical air temperature difference were 0.4%, 0.1%, and 0.2%, respectively, which belonged to "A" class according to the ISO-7730 Standard. While the vertical asymmetric radiation temperature of Scenario I/II was about 6.5 °C lower than that of Scenario III/IV/V. The ADPI for Scenarios III-V were about respectively 5.7%, 16.7%, and 21.0% higher than that of Scenarios I-II, indicating that a large radiation area and radiation angle coefficient could reduce the discomfort caused by radiant temperature asymmetry. The coupling mode improved local discomfort by decreasing vertical temperature difference and radiation asymmetry temperature wherefore improving the PMV from −1.6 to −1. The lateral air supply coupled with asymmetric radiation heating could potentially improve the thermal comfort of occupied area, while the comprehensive effect of thermal environmental improvement, energy-saving, and cost-effectiveness needes to be further investigated.

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Improvements of air flow distribution in a freezing tunnel using Airpak

Cited by 12 publications

References 6 publications

Investigation on the cross-infection control performance of interactive cascade ventilation in multi-scenario of winter

Investigation on the cross-infection control performance of interactive cascade ventilation in multi-scenario of winter

Methods for (industrial) thawing of fish blocks: A review

Thermal environment investigation of asymmetric radiation coupled with convection heating

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