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Old 01-28-2015, 09:32 AM   #221
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oh...... so not 12K?

no i was thinking closer to 5, thanks though!
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Old 01-28-2015, 09:40 AM   #222
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Oh, man I just love the old Rabbits. Especially the PU's, or "caddies".
I had a 79' Diesel that I cherished when I was 17, it got something like 50+ mpg's!
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Old 01-30-2015, 06:37 PM   #223
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Heat in,floor in

Heat all plumbed, pressure tested and working in all zones. Floor laid.



Driver floor. Still need to finish area around pedals. Wanted to see how much everything expanded when it got hot.



I haven't gotten all of the air out of the main loop yet, so it's not working very good. And there are still three blowers that aren't hooked up. Outside temp about 30 deg, inside temp. 70 with nice warm floors.
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Old 01-30-2015, 08:39 PM   #224
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Wow! That's amazing and i am jealous! Very nice work. An inspiration!!!
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Old 01-31-2015, 01:11 PM   #225
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I love it. All skoolies should have true hot water, in floor radiant heating. After having it, you will never want to be without.

Thank god you used the aluminum heat transfer plates. You would have gotten almost no heat with out them.

Nat
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Old 02-06-2015, 12:11 AM   #226
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Schematic of heat system.

If anyone is interested, I've put up a schematic of my heating system on my web page here

http://www.somewhereinusa.x10.mx/heat2.html

Dick
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Old 02-06-2015, 10:00 AM   #227
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Nicely documented.

Are there any isolation valves, or by pass loops on the heater cores, and the heat exchangers to avoid the extra restriction and flow loss, when they are not needed?

What are the lengths of the loops?

Do you have any head calculations per loop? Heater cores add big restriction.

What size pumps did you use?

How did you calculate what pump you needed where?

When I engineered mine, It has to be efficient running on off grid battery power. Running through extra heater cores and heat exchangers when not necessary would cause my variable flow pump to use more power. Valves are expensive, but anything to increase the flow rate, and decrease the electrical draw is a advantage.

Thx Nat
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Old 02-06-2015, 06:38 PM   #228
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Quote:
Originally Posted by nat_ster View Post
Nicely documented.

Are there any isolation valves, or by pass loops on the heater cores, and the heat exchangers to avoid the extra restriction and flow loss, when they are not needed?
There are shut offs at beginning and end of each loop. The loops are from manifolds that I didn't show for ease of drawing. There is a shut off in main loop to allow circulation when not using heat.

What are the lengths of the loops?
Bedroom and bathroom loops are about 48 ft each kitchen/living loop about 150.

Do you have any head calculations per loop? Heater cores add big restriction.
No

What size pumps did you use?
The pumps are the same as inside of the Espar unit. Here is a picture of the manifolds and pumps.


How did you calculate what pump you needed where?

Since these pumps push better than pull, I just put them all at the begininning of each loop

When I engineered mine, It has to be efficient running on off grid battery power. Running through extra heater cores and heat exchangers when not necessary would cause my variable flow pump to use more power. Valves are expensive, but anything to increase the flow rate, and decrease the electrical draw is a advantage.

Thx Nat
My system is very inefficient I'm sure. It wasn't really engineered, I just put it together. There were some places in the tubing where I had to use an elbow or connector just because in the limited space I couldn't use curve. Electrically very bad. The boiler and pumps are 24VDC, got them at a really good deal. Best way I could find to get 24V was a 120VAC converter. When not plugged to shore power, I'm using an inverter to get 120VAC then a converter to get 24VDC. Fans on heater units are 12VDC. All very messy, but it works and I'm quite happy with it. We haven't really had any cold temps since I got it all going, but at 0 deg, I can get it quite comfortable in there. At 0 the boiler will cycle through high and low, indicating that I'm not loosing all of the heat. After it's warm I can turn off all of the blowers and maintain the comfort with just the warm floor. I'm sure Jack is cringing at the complete lack of testing I did. I'm in the process of writing an operators manual for the whole bus, I keep forgetting how I did things and what needs to be on to work right.

Dick
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Old 02-06-2015, 07:05 PM   #229
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Thx for the info.

Nat
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Old 02-06-2015, 07:40 PM   #230
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Hey Somewhere. When you can turn out quality like that who needs mock-ups! Even with my testing, my finished product looks like an Escherian staircase assembled by Rube Goldberg compired to yours. Really nice work. Jack
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