[NightHawkInLight] a.k.a. [Ben] recently built an awesome high power air cannon out of PVC pipe. PVC air cannons are great, and everyone should build one of these at some point in their life ...
Researchers in China have built a PV-powered air conditioner that can store power ... variable-speed compressor with a frequency range of 360 Hz; a condenser; a liquid storage device; a capillary ...
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