Abstract
Warming meal at educational centers for students is done with microwave ovens consuming high energy and making long queue. Conventional hot box solar ovens can warm meal using free, abundant and clean Solar energy, during 10-11 months in a year in many places in Costa Rica. For the rest of the periods, if heating is required one can use Microwave Ovens. Different types of pots which can be used both in Solar and Microwave ovens have been searched and are studied. Due to pandemic period experiments have been done at authors house for measuring oven, meal temperature with solar radiation and with different pots. The heating of 14 lunch boxes is done with one solar oven and even simulating the clouds to see the performance and results are very promising. Due to COVID during 2020 and 2021, the classes were virtual, thus the real heating could not be done in any college to see the acceptance by the students and staff. We plan to promote see the real performance during 2022.
Highlights
USE OF MICROWAVE OVENS FOR HEATING MEALEveryone has to take hot lunch (40-50 °C) during mid-day
I will talk of warming meal at educational centers, the study can be applied to warming lunch at offices, houses and even street vendors
As the metallic pots cannot be put in microwave oven, we recommend thermal plastic pots (20 to +120 0C) which can be used in both solar ovens as well in Microwave ovens
Summary
Everyone has to take hot lunch (40-50 °C) during mid-day. I will talk of warming meal at educational centers, the study can be applied to warming lunch at offices, houses and even street vendors. Its well-known that any pot can be used except metallic or even with metallic lining, almost everyone uses plastic pot, some good, some medium and some even worst plastic pot No doubt this is convenient and fast way to warm lunch box. For students’ long queue and more time is needed to heat meal for say 100-200 students Their lunch break is only 30-45 min. 5) 99 percent of country is connected with electric grid still about 200 schools and colleges do not have electricity, they cannot use Microwave ovens. Another option could be the use of solar energy for heating the lunch
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