Utilização de 1-metilciclopropeno e resfriamento rápido na conservação de pêssegos

Pinto, Lucia C. de B.; Jorge, José Tadeu

doi:10.1590/s0100-69162007000100018

Cited by 4 publications

(2 citation statements)

References 7 publications

(7 reference statements)

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“…Brazil produces great variety and quality of fruit and is one of the world's largest producers of vegetables [1]. However, after the harvest, a great portion of production is lost due to inadequate handling and treatment, vulnerability to microorganism attack and inadequate cold storage [2]. These losses take place through all the productive cycle including the trade [3].…”

Section: Introductionmentioning

confidence: 99%

Cooling of Fruit with Arbitrary Shape: Simulation Using Galerkin-Based Integral Method

Pessôa

Lima

Swarnakar

et al. 2017

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Cooling has been used for the preservation of fresh produce such as fruit and vegetables due to its low cost and high effectiveness in maintaining the product quality. Recently, several researchers have conducted theoretical and experimental studies for obtaining the kinetics of cooling and cooling time for fruits with different geometries. Present work, therefore, aims to simulate the cooling of fruits with particular reference to banana, orange, strawberry and Tahiti lemon. The transient heat conduction equation and its analytical solution using Galerkin based integral method are presented. It has been found that the strawberry has lower dimensionless cooling time compared with time required to cool other fruits, which is due to its higher surface area/volume ratio value. In orange and lemon the temperature distribution was found to be homogeneous in the angular direction, while in banana and strawberry it was two-dimensional due to shape of the fruits.

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Section: Introductionmentioning

confidence: 99%

Cooling of Fruit with Arbitrary Shape: Simulation Using Galerkin-Based Integral Method

Pessôa

Lima

Swarnakar

et al. 2017

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“…This process is usually carried out in tunnels coupled with exhaust fans inside the cooling chamber, and allows the decrease in temperature of these products to the levels recommended for each produce type, cultivar and variety, thus contributing to increase its shelf life. PINTO & JORGE (2007) associated techniques of forced-air cooling with the application of the 1-methylcyclopropene and obtained firmer peaches (cultivar 'Natal)', with low levels of soluble solids, and reduced respiratory rate, compared to peaches of the control treatment, which were cooled slowly in a cold chamber, i.e., without the use of cooling techniques.…”

Section: Introductionmentioning

confidence: 99%

Control system for forced-air cooling of horticultural products

Silva

Mederos

2011

Eng. Agríc.

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This work is a study of the implementation of a classical controller using a tuning method referred to as IMC (Internal Model Control) and aimed at the reduction of electrical energy consumption by the appropriate relation between energy consumption and the cooling time with forced air. The supervisory system installed was able to manipulate the variable of frequency of the signal power of the exhaust fan engine (forced air module), to accelerate or decelerate the loss of heat from the product to be cooled by airflow variation that passes through the mass of the produce. The results demonstrated a reduction in energy consumption from 64% and an increase of only 8% in the cooling time to the system using PI/IMC (Proportional -Integral with IMC) tuning method compared with the system in its operating nominal condition. This PI/IMC control may be implemented directly in a frequency converter, without the need to purchase a computer or PLC (programmable logic controller) to run the dedicated application, increasing its economical viability.KEYWORDS: instrumentation, controller tuning, IMC method, cooling time, supervisory system. SISTEMA DE CONTROLE PARA O RESFRIAMENTO COM AR FORÇADO DE PRODUTOS HORTÍCOLASRESUMO: Este trabalho consiste no estudo da implementação de um controlador clássico utilizando o método de sintonia denominado por Controle de Modelo Interno, visando à redução do consumo de energia elétrica que decorra na adequada relação entre este consumo e o tempo de resfriamento do processo de resfriamento com ar forçado de produtos hortícolas. Para isto, o sistema supervisório instalado manipulou a variável de frequência do sinal de alimentação do motor de indução trifásico do exaustor (módulo de ar forçado), para acelerar ou desacelerar a perda de calor do produto a ser resfriado por intermédio da variação da vazão de ar que perpassava a massa deste produto. Obteve-se como resultado uma redução no consumo de energia elétrica de 64% e um acréscimo de apenas 8% no tempo de resfriamento para o sistema utilizando um controle proporcional e integral associado ao método de sintonia promovido por Controle de Modelo Interno, quando comparado ao sistema em seu funcionamento nominal. Esta estratégia de controle é passível de ser implementada diretamente em alguns modelos de inversores de frequência, sem a necessidade de compra de um computador ou controlador lógico programável para executar o aplicativo dedicado, tornando-o mais viável economicamente.

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Produção e qualidade dos frutos de pessegueiro e nectarineira em clima subtropical do estado de São Paulo

2011

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RESUMO -Tendo em vista que o conhecimento do comportamento de uma cultura, em determinada região, determina o sucesso da produção, a qualidade do produto final e a garantia de aceitação pelo mercado consumidor, o presente trabalho teve como objetivo avaliar a produção e as características físicas e físico-químicas de frutos de cultivares de pessegueiro e nectarineira, cultivados ou não tradicionalmente em São Paulo, mas que possam vir a apresentar uma opção de diversificação aos fruticultores do município PRODUCTION AND QUALITY OF PEACH AND NECTARINE FRUITS UNDER SUBTROPICAL CLIMATE OF THE STATE OF SÃO PAULOABSTRACT -The behavior of peaches in a certain region determines the production success, the final product quality and the guaranteed acceptance by the consumer market. The present study aimed to evaluate the production and quality of fruits from cultivars of peach and nectarine trees, cultivated or not, with a purpose to obtain more options of fruits cultivars in Botucatu, State of São Paulo, Brazil, and regions with the same climate conditions. The experiment was carried out during three crop cycles, 2006/2007, 2007/2008 and 2008/2009, at the School of Agronomical Sciences, UNESP, Botucatu campus. The predominant climate in the region is mesothermic, Cwa, subtropical humidity, with rainfall in the summer and drought in the winter. The evaluated peach tree cultivars were: Turmalina, Cascata 968, Cascata 848, Cascata 587, Conserva 693, Precocinho, Diamante Mejorado, Oro Azteca, CP-9553 CYN and Tropic Beauty. The evaluated cultivar of nectarine was Sun Blaze. Yield and fruit quality characteristics were assessed. The obtained results indicated that the cultivar Turmalina was the most productive. The cultivars Cascata 968 and Diamante Mejorado had the highest soluble solid content and the cultivars Cascata 587 and CP 9553 CYN presented the highest soluble solid/acidity titratable.

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Utilização de 1-metilciclopropeno e resfriamento rápido na conservação de pêssegos

Cited by 4 publications

References 7 publications

Cooling of Fruit with Arbitrary Shape: Simulation Using Galerkin-Based Integral Method

Cooling of Fruit with Arbitrary Shape: Simulation Using Galerkin-Based Integral Method

Control system for forced-air cooling of horticultural products

Produção e qualidade dos frutos de pessegueiro e nectarineira em clima subtropical do estado de São Paulo

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