BBB 2015 hot tub

[Head Womble]

As some of you know Lynda has requested a hot tub for next years bash,
it's not to be anything shop brought but something built by us lot using our normal scavenging attributes.

The initial thoughts are to run it off the Lister, the Lister providing the heat and the pump.

The tub it's self could be made from hay bales with a liner dropped in.

So has anyone got some other ideas.

Can this be made a sticky please.

[Rotary-Motion]

I would imagine the liner is the problem getting one big enough

also I got a brand new BnQ £5 pump they were selling many moons ago to donate to the tub and its bubble blower

[Head Womble]

I would imagine the liner is the problem getting one big enough

also I got a brand new BnQ £5 pump they were selling many moons ago to donate to the tub and its bubble blower

I was thinking builders plastic sheeting (the thick black stuff) for the liner, or pond liner but that would have to be paid for.

Donated parts so far = 1 x B&Q pump (thanks RM)

[julesandtash]

I have a spare 10 feet diameter, 26 inches deep inflatable pool. The pool liner is perfectly water tight, it's just the inflatable ring around the top leaks air which causes the pool to fall over but, if we could support it with hay bales then that would be fine. Holds 3500 litres of water although it is circular so maybe not the easiest to support with bales.

I have just ordered an arduino and four temperature sensors for my pool controller (pool temp, air temp, flow and return temps) to monitor the temperature and switch the flow on and off from the pool pump to the heat exchanger when needed. As my pool wont be needed during the BBB, I would be happy to bring it along but would want to take it home after the event.

We could use the lister but will need to put a decent load on it. If it is just idling it will never make enough heat. Ideally we would want around 2.5KW of load on it and even then, without an exhaust heat exchanger, the water jacket will only be giving around 2 to 3KW of heat.
It would need some pretty big pumps to load it to 2.5KW

The alternative is an old oil boiler run on bio (it's what I use every day).
A 15KW or so boiler, a couple of pumps (one for the boiler circuit, one for the pool to heat exchanger circuit), a flat plat heat exchanger, a header tank and some pipe will do it.
Running the pool water through a heat exchanger rather than straight through the boiler will stop any rust staining of the water and a boiler is a far more controllable heat source than the lister.

22mm PEX or copper pipe would seem the easiest material for connecting the boiler/heat exchanger, with 1" flexible pipe more suited for the pool connections.
Filtering would be a good idea too, some 10" housings and filter elements should see to that unless someone fancies building a sand filter.

Some good electrical protection will be needed (not sure of the earthing arrangements on Chugs power in the field) with electric pumps and a big container full of warm water and people. I'm sure Vince could deal with that.

Pool chemicals will also be a good idea considering that quite a few of us will be wanting to pile into it.
NigelB's chemical supplier does pool chemicals so could hopefully supply some chlorine and algaecide.

Having just come in from a dip in my new pool (still a 10" one but 30" deep and complete with a tubular steel frame) which is nice an warm from bio heating, I am more than happy to assist with implementation.

[greasemonkey]

I think Jules idea is about the best. I'm developing a boiler collecting habit, so may be able to provide, unless I've vandalised them all by then.
Builders polythene may work, but a couple of foot of water takes some holding back. The bales would have to be lashed together somehow. I'd be thinking about putting carpet under it, too, to stop any punctures.
A ready made poool would be coool......

[Rotary-Motion]

huge metal bars pounded into ground behind each bale, plus tie rope round side of bails
 and tonys burner gismo heat HE to get heat in


2 bails high and fit tank connectors to liner at first level with silicon sealer and say 4 a side to blow jets of water for the massage feature

[julesandtash]

Steve's syphon nozzle and bean can blast tube burner would work well into a boiler instead of the normal burner. That way there is a potential to burn hot liquid glycerol

[Julian]

Bubbles ... we've got to have bubbles.

I'll drop my strides, dip my backside in and break wind.

[greasemonkey]

Bubbles ... we've got to have bubbles.

I'll drop my strides, dip my backside in and break wind.

That is precisely one of the reasons I don't go in swimming pools.........

[julesandtash]

I'm sure that somebody could craft a few venturi nozzles for that purpose

[Rotary-Motion]

a shower facility added on too, to wash down before entry, as on sunday I was humming

a prison hose down before lice powder hits...

[Julian]

I'm sure that somebody could craft a few venturi nozzles for that purpose

Actually, as the temperature won't be that high, it's an application were printing one would be viable.

[Head Womble]

I didn't go into too much detail in my first post as I wanted imput from others.

We had thought of an M67 heater dropped into a 205 drum with the water being pumped from the tub into the 205, hot water overflowing (through a pipe) back to the tub,
this would get it up to temp quite quickly, but is not a good idea for constant heat.

[Julian]

All this talk of straw bale building .... if only we knew an expert in the field (pun intended along with sarcasm!)

[Head Womble]

All this talk of straw bale building .... if only we knew an expert in the field (pun intended along with sarcasm!)

That was the idea.