Regarding the compressed-air problem you mentioned, have you seen LightSail Energy&#x27;s (<a href="http:&#x2F;&#x2F;lightsailenergy.com" rel="nofollow">http:&#x2F;&#x2F;lightsailenergy.com</a>) solution to it?<p>&quot;Our innovation: an elegant method of capturing this heat energy and regenerating useful energy from it. We inject a fine, dense mist of water spray which rapidly absorbs the heat energy of compression and provides it during expansion.&quot;<p>Maybe one of the founders, @DaniFong (<a href="https:&#x2F;&#x2F;news.ycombinator.com&#x2F;user?id=DaniFong" rel="nofollow">https:&#x2F;&#x2F;news.ycombinator.com&#x2F;user?id=DaniFong</a>), can chime in.