Induction Heated Coffee Roaster

Author: Marshall Engelhard, Faculty: Mark Borden, Kangho Song Department: Mechanical Engineering Address: University of Colorado at Boulder, 552 UCB, Boulder, CO 80309-0552

Coffee has become an essential in today’s economy, producing a yearly revenue of over seventy billion dollars and creating nearly two million jobs in the United States alone, but comes with a high cost. One of the most energy intensive steps for making coffee is the process of roasting raw coffee beans. Due to the design of most coffee roasters this process is rather inefficient with up to 75% of the heat produced being lost to the surrounding environment. A common resistor-heated coffee roaster uses 0.17 kWh to properly roast 4 oz. of raw beans. In comparison, a tea kettle only uses only 0.0026 kWh to boil 4 oz. of water. This project's purpose is to build a coffee roaster that utilizes induction heating in order to increase the efficiency of the coffee roasting process. Heating via induction is one of the most effective methods currently available. Induction heating has recently been introduced for stove-top cooking and was shown to increase efficiency up to 40%. Beyond stove tops, however, there is little implementation of induction heating in cooking appliances. Here, we test the hypothesis that induction heating increases the efficiency of coffee roasting. To determine this, a custom induction heated coffee roaster was designed and built, and the efficiency is compared with that of a standard resistor-heated coffee roaster. This is done by comparing the electronic consumption required of each roaster to completely roast a batch of raw coffee beans and the amount of time required to roast the batch of coffee. Based on these results, the amount of waste heat produced by each roaster can also be examined. We hypothesize that the induction roaster will be more efficient both in electronic consumption and time-to-roast, owing to the high efficiency of induction heating and the instantaneous heating of metallic components.

Additional Abstract Information

Presenter: Marshall Engelhard

Institution: University of Colorado at Boulder

Type: Poster

Subject: Mechanical & Industrial Engineering

Status: Approved

Time and Location

Session: Poster 8
Date/Time: Tue 5:00pm-6:00pm
Session Number: 5603