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Old 10-04-2015, 07:15 PM   #11
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So I take it y'all don't have any spares? I'm looking for a good used Webasto or comparable heater for Heavy to keep us warm in the winter. I figured if I begged someone would know where to find one (or two)....... I have some money, just not a whole bunch (unless you want to count the ones.......).
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Old 10-04-2015, 10:28 PM   #12
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Unless the engine is covered with spray foam, it will not act as a thermal mass storage. It will act as a thermal dump, wasting a ton of heat and more importantly wasting a ton of diesel and money.

If you want to store heat in a thermal mass to prevent short cycling, add a storage tank.

Nat
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Old 10-04-2015, 10:52 PM   #13
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Maybe I should just foam in the whole engine then. Imagine that, almost a full ton of thermal mass to use for heating

I'll probably figure out a tank, then. It would be great to keep it inside the bus, but Im out of interior room for something so big. Nat--any guess what a good size would be? I was thinking in the 30 gallon range... bigger would be better but filling a 50gallon system with coolant seems like it would be $$$$

I entertained the idea of taking a steel box, putting a cooper coil through it, then filling with sand or some other heavy, dense material, then putting this box in an insulated, larger box. I would then only have to run the coolant through the copper tube and sand is way more dense for storing energy than water.
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Old 10-04-2015, 11:03 PM   #14
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Quote:
Originally Posted by M1031A1 View Post
So I take it y'all don't have any spares? I'm looking for a good used Webasto or comparable heater for Heavy to keep us warm in the winter. I figured if I begged someone would know where to find one (or two)....... I have some money, just not a whole bunch (unless you want to count the ones.......).
I'm working on a couple but sadly you'll need more money then you want to give.
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Old 10-04-2015, 11:10 PM   #15
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Quote:
Originally Posted by nat_ster View Post
Unless the engine is covered with spray foam, it will not act as a thermal mass storage. It will act as a thermal dump, wasting a ton of heat and more importantly wasting a ton of diesel and money.
Thats not exactly a true statement. In this case however, a water tank would be far more efficient. If you have the space you want to give up that is.

I use my bus every other weekend for 3 days. If you were living it it, sure enough, foam everything...until you need it to be cool in the summer.

Any heat loss from my engine goes up...right to where our bed is. Its a win win for me.

Sure, its not the most efficient way to go about it but, I dont have to cold start my engine.

The less complex a setup is, the better.

A water heater tank would be the cats meow though if you were living in it.
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Old 10-05-2015, 12:28 AM   #16
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Quote:
Originally Posted by charles_m View Post
Maybe I should just foam in the whole engine then. Imagine that, almost a full ton of thermal mass to use for heating

I'll probably figure out a tank, then. It would be great to keep it inside the bus, but Im out of interior room for something so big. Nat--any guess what a good size would be? I was thinking in the 30 gallon range... bigger would be better but filling a 50gallon system with coolant seems like it would be $$$$

I entertained the idea of taking a steel box, putting a cooper coil through it, then filling with sand or some other heavy, dense material, then putting this box in an insulated, larger box. I would then only have to run the coolant through the copper tube and sand is way more dense for storing energy than water.
The beginning information needed to start this calculation.



Quote:
Originally Posted by opus View Post
Thats not exactly a true statement. In this case however, a water tank would be far more efficient. If you have the space you want to give up that is.

I use my bus every other weekend for 3 days. If you were living it it, sure enough, foam everything...until you need it to be cool in the summer.

Any heat loss from my engine goes up...right to where our bed is. Its a win win for me.

Sure, its not the most efficient way to go about it but, I dont have to cold start my engine.

The less complex a setup is, the better.

A water heater tank would be the cats meow though if you were living in it.
Interesting way of thinking.

At the shop we do the foam side vent covers for lowering the amount of diesel used each night when the winter wind is really blowing. It's unreal how much more heat it takes on a windy night.

Nat
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Old 10-05-2015, 12:37 AM   #17
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We were out last year end of November. It was -8 and we couldn't get out of the wind. That was the only time we've been cold, and we were cold!
That's why I made foam vent covers last week.
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Old 12-14-2015, 04:31 AM   #18
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I was recently looking at Webasto duo-top evo, so if you have something similar available I'd be interested. I don't know how the boiler system would work for "on demand" or if that's even possible. 12L doesn't seem to be a whole lot of hot water.

I also plan on going with as many diesel-operated systems as possible. I plan on adding an additional 50gal diesel tank to support those systems.
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Old 12-14-2015, 07:11 AM   #19
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have you considered a small lp on demand unit like an l5 with a dc circulator pump with either in floor heating or radiator type exchanger.
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