SPCVIP=Structural Phase Change Vacuum Insulated Panel. The application is an 8x6x6 ft camperbox with a 6.5x6x3 ft cabover sleeper area. Ideally, I'd like to build with SIPs that are 2 inches thick or less with a 1 inch vacuum panel core, with 1/2 inch of BioPCM phase change material or another similar brand of phase change material between the vacuum panel core and the interior skin. It's important that the panels are as light as possible and have an interior wood skin. If the phase change material cannot be placed between the core and interior skin, then the lightest, thinnest interior skin I guess would be best, and then to put the phase change material and an interior wood finish on that, I haven't been able to find any manufacturers making any products like this. I'd like to hear from everyone especially the manufacturers.

I see some people are looking. This is still in the exploratory stages so any opinions would be greatly appreciated! I've read that some buildings are starting to be built like this in Germany. Unfortunately, I just can't find much technical information. Maybe a 1 inch thick SPCVIP consisting of 1/8 inch interior would skin, 1/4 inch phase change material, 1/2 inch vacuum insulated core, 1/8 inch exterior skin? What is the feasibility on that?

sent you a PM earlier did you read it?

Ah, yep. I responded in my private email. Let me know if don't see it. I can resend it through green building talk.

Actually, I just noticed it didn't go through. I re sent it through the PM function on this site

I'm not too specific on the exterior skin. Just the lightest, thinnest skin possible while maintaining strong durability as the walls will routinely bounce off trees and rocks. I read that a 0.016" thick galvanized steel exterior skin withstood an 80 mph projectile test. That seems like pretty good performance. The weight on that skin though was not posted. I would guess the weight would be competitive though. As well, I'm only particular on the interior skin being a light colored wood. I'd like it to be as thin and as light as possible. Of course, maintaining some sort of reasonable durability as well.

The part that I'm more specific about is having a vacuum insulated core that is 1/2-1" thick, and phase change material integrated in the most efficient way.

The part that I'm more specific about is having a vacuum insulated core that is 1/2-1" thick, and phase change material integrated in the most efficient way.

The part that I'm more specific about is having a vacuum insulated core that is 1/2-1" thick, and phase change material integrated in the most efficient way.

The part that I'm more specific about is having a vacuum insulated core that is 1/2-1" thick, and phase change material integrated in the most efficient way.

The part that I'm more specific about is having a vacuum insulated core that is 1/2-1" thick, and phase change material integrated in the most efficient way.

The part that I'm more specific about is having a vacuum insulated core that is 1/2-1" thick, and phase change material integrated in the most efficient way.

The part that I'm more specific about is having a vacuum insulated core that is 1/2-1" thick, and phase change material integrated in the most efficient way.

Wow, sorry for all the repeats! The browser froze up and I clicked it a few times trying to get it to go through then this happened!

Sound interesting and feasible (but probably quite expensive). I'm curious - you are storing heat from what source? Eg, cool evenings to hot days? From when the vehicle is running to cold nights?

The panels have to be charge/discharged - an insulator like wood will slow that down.

Thanks for the reply! As for your questions, if I follow correctly, I'll be using the phase change material to store heat Energy is stored in the form of latent heat via phase change. I plan to use a 72 deg.f bio-based phase change material called BioPCM (check out the BioPCM website, they'll explain it better than me). The whole idea is that the material releases heat when the room falls below 72 deg.f and absorbs heat when the room rises above 72 deg.f. It's not a complete solution, I plan to supplement it with passive heating/cooling design, and a small wood stove for extreme cold. I plan to stay out of extreme heat. Although, I could always add a backup for that too. In your last sentence, by "the panels" do you mean the phase change material? If so, I did think about this, but explain it like that because that's what I saw on the BioPCM website. It looks like they show their BioPCM product, when utilized in conventional wood frame construction, placed in the wall between the insulation and gypsum board. Although, it is difficult to tell so let me know if you see something else. Thanks again.

It probably will be quite expensive but I only need 30 square yards.

And it's worth the investment to me as it will be my full time house for the next 5-10 years.

> the material releases heat when the room falls below 72 deg.f ...

But only if you charge it beforehand. Ie, if you want it to release heat as the interior drops below 72F, then you have to first raise the phase change panel above 72F for awhile. Hold the panel below 72F for awhile and it will stop doing anything.

Very roughly, it might take four T-105-RE lead acid batteries and a heat pump to store the same amount of heat (in electrical form). Or 150 gallons of water raised 20F.

I'm definitely going to do the wood stove, but I do plan on having a lithium-iron-phosphate battery bank with solar and wind generators for appliances and lights so adding a heat pump to that systems could probably be worked in without eating up too much more space and weight. The biggest reason for the wood stove is for that special "wood stove ambiance" and I enjoy the atmosphere from wood heat and cooking with wood heat. The whole idea to use the phase change material is to be able to go longer intervals between lighting the wood stove if need be. It's similar to the technique some off-grid homes have with the "rocket mass heater" if you're familiar with the concept of that heating system. I may be in cold areas with very minimal wind and sunlight for long periods and I plan to be completely off grid so just electric heat might not always work the best. That's also why I want the wood stove.