Design And Modelling Of Drum Type Coffee Roasting Machine Using Liquefied Petroleum Gas (Lpg) As A Source Of Energy

Abstract

Coffee is one of the world’s most popular beverages and its processing involves distinct operations: planting, harvesting,sorting,drying, roasting, grinding and packing. Among these processes the roasting process is extremely crucial for the quality of the final coffee aroma. Roasting presents the key step in coffee processing to develop the characteristic flavor properties for which coffee is appreciated. In addition, roasting induces major physical changes within the coffee beans and determines their behavior in storage, grinding, and brewing. The impact of the roasting parameters roasting time, roasting temperature, moisture content, quenching method, and roaster design, on aroma formation, aroma stability, and grinding properties of roasted coffee were a very important things to investigate for better economical and customer satisfaction. Since the existing roasting machines are not fully capable of obtaining the desired quality and depending on their source of energy, therefore in order to obtain the mentioned merits to fulfil the demands satisfaction it is needed to design the rotating drum type coffee roasting machine to keep in touch the specific desires of this thesis accordingly. The beans are roasted for a period of time ranging from a few minutes to about 30 minutes and the roasted coffee would be packed in order to keep its aroma and quality The general objectives is design and modelling of rotating drum type coffee roasting machine using LPG as a source of energy and the system uses atmospheric burner which is placed outside underneath of rotating drum. The methodology of working is, the drum type coffee roasting machine is typically horizontal rotating drums that tumble the green coffee beans in a current of hot burner flame and very important roaster that it keeps the uniformity and homogeneity of roasting. At the end of the roasting cycle, water sprays, fan and air are used to "quench" the beans. In conclusion, the study would yields economical, easily operated and maintainable roasting machine to obtain the crucial and valuable flavor of coffee aroma with high quality.