3 ms·
They don't do anything with it, judging by the photos of rectifiers mounted on the wall without any heat exchange or recycling equipment to be seen. It's unlike
by m4x 13y ago
They don't do anything with it, judging by the photos of rectifiers mounted on the wall without any heat exchange or recycling equipment to be seen. It's unlikely that there's much heat to recycle though. If there was, those same photos would show significant heat sinks to help dissipate the energy away from the rectifiers.
We don't bother recycling any heat from roadside transformers or larger substations either, and they carry a great deal more energy than the rectifiers powering 7 - 10 lift motors.
- pkulak 13y agoRoadside transformers are AC to AC, which is way more efficient and easy than AC to DC. My car runs on DC, and the quick chargers that provide 60 KW are the size of a large closet and have loud fans to dissipate heat.
- dfox 13y agoLargest source of inefficiency (and heat) in common isolated SMPS designs is output rectification, which has to run on frequencies ranging from tens kHz to units of MHz, thus the diodes there tend to spend relatively large proportion of operating time in various half-open-half-closed states. Active rectifiers somewhat improves overall efficiency for high output currents, but the problem with switching time still remains. On the other hand for line-frequency rectifier times required for rectifier to switch can be ignored and only significant source of heat is voltage drop on rectification diodes (ie. 0.6 - 1.5V), so one watt of heat dissipation per one ampere of current is good ballpark.