Hi there, It’ is my first winter and I am trying to find out the best set up for the hive…Here in the northern coastal suburbs of Perth we have a significant temperature span 7degrees at night and early morning and up to 20 degrees(Celsius…) during the day… having said that…I still have the super on as the bees are still visiting it…During these last few days I found a lot of condensation on the observation windows and the flow frames…Checking the roof and the inner cover there’re no signs of leaks, hence the condensation should simply due to the temperature difference… In these days I am leaving the observation window open to help getting rid of the condensation…but have I to put an hive mat on the top cover? Insulate a bit the exterior of the hive, or remove completely the super? If I have to remove the super how do you store the flow frames? Do you wash them and then seal them in a clingwrap??
Wouldn’t recommend leaving them open. The frames are UV sensitive and you’re just artificially heating the hive. The bees will manage the condensation, even use it as a water source.
The frames in your picture look unused - how long have they been on? Did you get any nectar or honey in any of the flow frames during the spring-fall?
I’m not sure what the foraging situation is in your area over winter but from the season and the paucity of bees, I would recommend removing it. You can harvest any uncapped honey and feed it back to the bees, then rinse and dry the frames. After they’re dry you can just put them back in the super box and store them in a dark place.
Insulation never hurts but is probably unnecessary in your climate.
Condensation in the window comes from the bees themselves and is caused by the window being a cold surface. Water vapor condenses on the coolest place. If I was you I’d consider removing the super every winter. Harvesting and honey is ok - even ifs it nectar you can freeze it and feed to back to the bees in spring. But to do that you almost need another super as winter food for the bees. That could be an ideal- shallow box.
As it’s too late for that now- if you do leave the super on consider adding a quilt box- or heavily insulating the roof. Im experimenting with a quilt box this winter in two hives- I’ve removed my flow supers from all my others.
Hi Chau… I didn’t get any at all as I lost my first colony being queen less and me being not that prepare to recognise it 
…Hence this is the second colony in there and they had been in the flow hive since Feb 21…As far as I can see from the observation windows they jointed few cells I don’t really see any nectar nor honey in the flow frames…
Definitely remove the Flow super then. 
Your entrance is also pretty small, that might increase the condensation by limiting the ventilation. You might want to try the type of entrance reduction that @Eva and @JeffH use all the time. Rather than having the entrance in the middle, cut a notch 1cm tall and about 4cm wide at both ends of the hive entrance. That means that bees can fan air into the hive on one side, and out of it on the other, decreasing the humidity in the hive more efficiently. 
Thanks Dawn, I see what I can do, as I haven’t got in stock additional wood!! I might cut a notch on the side of the entrance I have…
I’d remove the super. Drain any nectar and feed it back to the bees.
Wash out the frames, air dry and store in an airtight container until next season
You could turn that piece upside-down and cut the new notches. It is a lot taller than the entrance, so it should work, as the old reduced entrance would then be above the original hive entrance
I’ve used scrap pieces of foam insulation in a pinch.
Definitely smart thinking…I guess I know what I am going to do tomorrow…
Hey Dawn flow frames removed and I discovered a little bit of mould in the inside of the roof, I re-sealed it. I replaced the flow frames with a feeder (leaving the top box on), then I stored the flow frames in a transparent box see picture…the frames are empty but the bees have started to wax the cells…Now what to do? I am planning to let the frames dry a bit and then seal them in a clingwrap, I am not planning any wash…Any advise?
Sounds fine to me. I usually freeze mine for 24 hours before storing, to kill off any wax moth eggs, but if there isn’t anything in the frames, you may not need to do that