i was told has the bubbles face the outside.
Personally, I disagree with the logic used by those above. If the bubbles are up, there will be larger surface area to absorb the sun's heat. Increased levels of heat absorption seems more important than the rate of heat transfer, especially when considering the fact that heat transfer takes place almost instantaniously.****i have tried it both ways, bubbles up or down. makes little or no difference heating. with bubbles down, though, it is easier to clean debrie off the cover and keep it clean.
The bubbles are on the inside of the bubble wrap, creating a cushioning layer to protect fragile items from impacts during transportation or storage. The smooth side of the bubble wrap is typically on the outside.
The bubbles go face down on the solar cover because when the sun hits the smooth side if the cover it warms the bubbles up on the other side & the bubbles on the solar cover holds more heat than the smooth side
All Solar Pool Covers are placed on your swimming pool with the bubble side down, or facing the water. This allows an air pocket to form under the cover to trap heat & provide the maximum insulation value the cover is designed for. -Charlie Goss President DPD Pools / PoolDeals.com
The smooth side of a solar pool cover should face down toward the water to help trap heat and prevent debris from entering the pool. The bubbles or air pockets on the cover should face up, as they help to capture and retain heat from the sun.
It looks like a bunch of tiny bubbles bunched together, kinda like foam but the bubbles are about the size of a pin head.
The side with the bubbles sticking out
the lava bubbles up and some of the rock cools while there is a bubble and makes a little gap in side.
When water is heated it releases gas. The gas comes out in a bubble form.
The smooth side of the backer board should face outwards.
There are many people on this site who have the intention of helping you, but you do not seem to appreciate this. Honestly, bubbles can not be sharp. It is an oxymoron. A bubble is a pocket of air that has the smallest surface area. The skin stretches tight, so it is smooth and rounded. It is impossible to have a sharp bubble, unless it has a wire frame, but then, it is not the bubble that is sharp, but the frame. Please resubmit the question.
The rough side of the cement board should face outwards when installing it.