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What is Frost Formation

Chapter 1
Handbook of Research on Computational Simulation and Modeling in Engineering
Frost formation occurs when humid air encounters a surface whose temperature is less than the freezing temperature of water (273 K), and is less than the dew point temperature, so that water vapour goes from a gaseous to a solid state. As the frost layer increases in the evaporator surface, the cooling capacity of refrigeration is depleted due to the extra thermal resistance to the heat transfer process and also because it increases the air pressure drop, thereby substantially reducing the fan-supplied airflow rate.
Published in Chapter:
Computational Modelling and Simulation to Assist the Improvement of Thermal Performance and Energy Efficiency in Industrial Engineering Systems: Application to Cold Stores
Pedro Dinis Gaspar (University of Beira Interior, Portugal), Pedro Dinho da Silva (University of Beira Interior, Portugal), João Pedro Marques Gonçalves (University of Beira Interior, Portugal), and Rui Carneiro (University of Beira Interior, Portugal)
Copyright: © 2016 |Pages: 68
DOI: 10.4018/978-1-4666-8823-0.ch001
Abstract
Computational modelling is nowadays a powerful tool for project and design of engineering systems, anticipating and/or correcting problems that may lead to inefficiencies. This chapter describes three distinct computational tools with different mathematical and numerical models. The computational tools are used with the purpose of improving the thermal and energy performance of cold stores. All tools are applied to the same agrifood company. First, Computational Fluid Dynamics is used to optimize velocity and temperature fields for the interior a cold room. Afterwards, an energy analysis and thermal load simulation is performed to the cold store facility to reduce its thermal loads. Finally, a statistical prediction model based on empirical correlations is used to predict the energy performance of the cold store and compare it to an average behaviour. The numerical results indicate the improvement of the thermal performance and consequently of food safety, as well as considerable energy savings that can be achieved in cold stores by the combined use of different modelling techniques.
Full Text Chapter Download: US $37.50 Add to Cart
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Chapter 16
Experimental Analysis to Optimize the Performance of Air Curtains and Heat Exchangers: Application to Refrigerated Display Cases
Frost formation occurs when humid air encounters a surface whose temperature is less than the freezing temperature of water (273 K), and is less than the dew point temperature, so that water vapour goes from a gaseous to a solid state. As the frost layer increases in the evaporator surface, the cooling capacity of refrigeration is depleted due to the extra thermal resistance to the heat transfer process and also because it increases the air pressure drop, thereby substantially reducing the fan-supplied airflow rate.
Published in Chapter: Experimental Analysis to Optimize the Performance of Air Curtains and Heat Exchangers: Application to Refrigerated Display Cases; From: Handbook of Research on Advances and Applications in Refrigeration Systems and Technologies
Full Text Chapter Download: US $37.50 Add to Cart
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