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    Abstract, Intro, Objectives Tray Dryer

    Uploaded by

    Nawal DaBomb
    This experiment aims to determine the drying rate of pandan leaves using tray dryers and learn how to operate the tray dryers. The mass and humidity of the pandan leaves were recorded every 5 minutes along with temperature and air flow velocity. Three graphs were plotted showing that as time increased, mass and moisture content decreased, while drying rate fluctuated. This shows that drying rate does not depend on time.

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    Abstract, Intro, Objectives Tray Dryer

    Uploaded by

    Nawal DaBomb
    2K views3 pages
    This experiment aims to determine the drying rate of pandan leaves using tray dryers and learn how to operate the tray dryers. The mass and humidity of the pandan leaves were recorded every 5 minutes along with temperature and air flow velocity. Three graphs were plotted showing that as time increased, mass and moisture content decreased, while drying rate fluctuated. This shows that drying rate does not depend on time.

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    This experiment aims to determine the drying rate of pandan leaves using tray dryers and learn how to operate the tray dryers. The mass and humidity of the pandan leaves were recorded every 5 minutes along with temperature and air flow velocity. Three graphs were plotted showing that as time increased, mass and moisture content decreased, while drying rate fluctuated. This shows that drying rate does not depend on time.

    Copyright:

    Attribution Non-Commercial (BY-NC)
    Download as DOCX, PDF, TXT or read online from Scribd
    Download as docx, pdf, or txt
    2K views3 pages

    Abstract, Intro, Objectives Tray Dryer

    Uploaded by

    Nawal DaBomb
    This experiment aims to determine the drying rate of pandan leaves using tray dryers and learn how to operate the tray dryers. The mass and humidity of the pandan leaves were recorded every 5 minutes along with temperature and air flow velocity. Three graphs were plotted showing that as time increased, mass and moisture content decreased, while drying rate fluctuated. This shows that drying rate does not depend on time.

    Copyright:

    Attribution Non-Commercial (BY-NC)
    Download as DOCX, PDF, TXT or read online from Scribd
    Download as docx, pdf, or txt
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    The key takeaways are that the experiment aims to determine the drying rate of samples using tray dryers and learn how to operate tray dryers. Various parameters like mass, temperature, humidity and velocity were recorded during the drying process.

    Drying is the process of removing volatile substances like moisture from a material to yield a solid product. It involves transferring heat energy from the surrounding environment to evaporate surface moisture using methods like heated air currents or radiation.

    Tray dryers are discussed in the passage. They are dryers made of trays held in a heated cabinet, with heated air passing over the samples on the trays to remove moisture.

    Abstract The objectives of this experiment are to determine the drying rate of the sample using tray dryers

    and to learn how to operate the tray dryers. In this experiment, the main apparatus used is Tray Drier Training Unit CE130 and the sample used is the pandan leaves. At first, the mass of both drying plates and pandan leaves were weighed before the pandan leaves were placed on the tray dryers. The initial humidity, temperature and velocity of air flow were also recorded. The temperatures, mass of sample, air humidity and velocity were then recorded every 5 minutes. At the end of the experiment , the moisture content and the drying rate were calculated along with three graphs being plotted for a clearer observations of the experiment. Based on the first graph plotted which is mass of the sample versus time taken, it is shown that as time increases, the mass of the sample decreases. From the second graph, which is moisture content versus drying time, the moisture content in the sample decreases as time increases. However, according to Graph 3, the drying rate start to fluctuate as the time increases. This shows that the drying rate does not depend of time.

    Introductions Drying is one of the unit operations used in industry nowadays especially in food industry. It is the process of removing volatile substances (e.g., moisture) to yield a solid product. It involves the transfer of energy, mostly as heat from the surrounding environment to evaporate the surface moisture. Air heater and fan are usually used industry to pass air over the product that is being dried. Dried products preserve well because the moisture content is so low that spoilage or organism cannot grow. There are various types of dryers that are being used in industry. One of them is tray dryers. Tray dryers are made of trays held in a cabinet, which is connected to a source of heated air by gas, diesel or biomass. The food, which is to be dried, is spread out, generally quite thinly, on trays which the drying takes place. Heating may be by an air current sweeping across the trays, by conduction from heated trays or heated shelves on which the trays lie, or by radiation from heated surfaces. Most tray dryers are heated by air, which also removes the moist vapours. The temperature of ambient air is controlled by thermostat which is usually set in the range of 50 to 700C. The air enters the bottom of the chamber below the trays and then rises, through the trays of food being dried, and exits from an opening in the top of the chamber. Fresh air is allowed to enter the cabinet and moist air is exhausted by using a humidistat to control an exhaust fan and air intake shutters. The dryer trays are tight-fitting in the cabinet to prevent air from bypassing the material to be dried. Depending upon the food and the desired final moisture, drying time may be of the order of 10 or even 20 hours. Tray dryers require low capital and maintenance costs but have relatively poor control and produces more variable product quality. However, in recirculation designs, the moisture laden air, after evaporating water from food, would have to be dried before being undergo recirculation, or else it would soon become saturated and further drying of the food would stop. In such a case passing it through a desiccant such as a bed of silica gel, or condensing moisture out by passing the moist air over cold plates or coils could dry the air. Thermometers are installed with the sensitive elements directly in the main air current approaching the drying trays, and often also in the air current leaving trays.

    Objectives To : (a) (b) Determine the drying rate of the sample using tray dryers Learn how to operate the tray dryers

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