No dryer should ever be vented inside a house it can create huge mold or dryrot problems, not the heat but all the moisure just being thrown right into your house and the wood it's made of.
Take the window glass panels out and cut a thick sheet of plywood to fit over the frame. Use drywall screws or whatever to attach it from inside. The cut a whole in it for your dryer vent and run the dryer out that hole to a proper vent cover like you'll find at any home depot or whatever. Vent your grow space the same way, get aluminum ducting and a vent cover and squirrel cage fan. Don't connect your grow duct to the dryer duct and run just one line out either, bad idea.

Make sure you have no light leaks or gaps for bugs to get in with spray foam.

You keep the window panes and if you ever want to reverse it all you can just unscrew the whole thing and mount the window panes back up.