Menessis

OK I had to google myself because I could not find the pics that I promised. Here is a link to the forum where I was asking for help. Most people told me it wouldn't work because the tube was too small. So now 10 years later they can kiss my entire butt! LoL And here is the guy that inspired my build ZeroFossilFuels

Here is a pic of the woodstove. I have a 3D cad drawing also.....must be on the really old pc!

Ha ya I overlooked the delta T....my bad.

I may have a 3d cad drawing of the stove still....I look through the old pc and see what I can find. The higher temps in the sand don't allow for water to be used to move the heat. The industrial ones use an air heat exchange. The air in turn heats water. The water is pumped away to do its job. In my example I came up with 69 million jules. And then converted to BTU's.... over here we conmanly use BTU's when describing heating and cooling equipment. So If I change my formula from sand to water by changing the "c" value to that of water it should work?

WoW a lot of replies. But no feed back about my math. I'm asking if I am doing the math right. The same math works for water or sand or granite...... I'm asking if I am doing the math right. The wood stoves with a huge mass works well because you burn that fire full throttle. The heat sinks into all that masonry. Once it's hot the room will stay plenty warm long after the fire is out..... I didn't go that route in my little work shop. Just the stove. No room for all the mass. And I don't want to wait for it to warm up out there. It goes from -20'c to + 20'c in an hour. An airtight stove might run around 250'f all day long. A rocket stove retains the heat in the firebox to allow the combustion to reach a temp where the smoke will burn. My stove goes to 240'f for about 10 minutes then off it goes. The top will exceed 600' f. I welded on 12 - 1 1/2" flat bar 18" long verticly all around the stove the second season. Helps quite a bit. Also the 4" vent comes out the bottom at one side. You can hold your hand on the vent. Which means that stove is working pretty good. BTW the "fire pot" it only one brick square.

Hello from Canada I like to tinker. I have a decent work shop to build things. I heat the shop with a Rocket Stove I built for instance. I am intrigued with the sand battery technology. I may end up building a WSHP. We used to install WSHP years ago. I know they work well. So expensive if you need to hire a contractor though. So I am working out mass storage (water) for heat pump but I want to play around with a sand battery too! LoL Here is what I googled up trying to learn how to calculate heat storage. Maybe some one here can check if I'm doing it right or not. Thanks Menessis