Development of an Enhanced Vermitea Vortex Brewer

Abstract


Commercial vermitea vortex brewer is expensive and is not locally available in the Philippines. The main objective of this study is to design and construct a low-cost vortex-style vermitea brewing machine that produces good quality vermitea. Specifically, it aimed to establish the operating time of the brewers and evaluate its performance in terms of brewing efficiency and percent yield. The properties of the produced vermitea were also evaluated in terms of pH level and dissolved oxygen content. The effects of varying amounts of air added (at T1-7.2L/min, T2-14.4L/min, T3-21.6L/min, T4-control/frequent manual stirring) during the brewing process to the operating time, machine performance, and properties of produced vermitea were also determined. The vermitea brewers use air pumps and air stones to induce a high volume of diffused air into the system. The establishment of brewing time was conducted for 24 hours and the fastest time was identified for T3 and T4 at 12 hours and longer brewing time of 20 hours was identified for T1 and T2. It was observed that the brewing time was shorter for the brewer with the highest amount of air added during the brewing. The largest percent yield was given by the brewer with the least number of pumps (T1) which is 93.39%. The brewing efficiency of the fabricated brewers was above the critical value. Also, the produced vermitea by the brewers has no foul odor which is an indication of proper aeration. The pH levels of the produced vermitea are all acidic, at a range of 6.19 to 6.86, but are still within the acceptable range. An economic analysis indicates that the most economically feasible is brewer T2 with 7.2L/min/min of air added during brewing.

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