Dengyo has unveiled a new device they have created to harvest microwave oven or industrial microwave heating machine electromagnetic energy which is discarded during the heating process and normally wasted. Once harvested by the little box the microwaves are then converted into energy.
The small device is capable of recovering up to 100 watts of power, if its located within a microwave. Around 10% of the energy used to power a normal microwave oven.
The device combines an antenna and rectifier, and it converts electromagnetic waves into direct-current power and use the series of 2.4GHz-band. Dengyo explains:
ηt = ηm x (1 – ηh) x (1 – LC) x ηr x ηC
” In this formula, ηm is the efficiency of converting alternating-current power into microwaves with a microwave oven, etc. ηh (heating efficiency) is the ratio of the energy used for heating food or materials to the energy of the generated microwaves. LC is the loss of the transmission circuit. ηr is the efficiency of the rectifier, and ηC is the efficiency of the boost circuit or superposed circuit.
Among those parameters, ηh (heating efficiency) fluctuates most because it depends on food or materials. It ranges from 0 to 90%.
Food and materials that contain much water tend to have high ηh, and those that contain only a small amount of water tend to have low ηh,”
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