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Old 10-18-14, 05:52 PM   #21
vwhead77
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Cool Different Design - same goal

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Ok - second experiment - external coil / discharge from HP - (it's actually a lot more wraps than the internal coil) I managed to wrap 30' of 1/4" copper around a 2" copper pipe. I'm going to insert it into a 4" PVC jacket and fill it with 'fire rated' foam insulation. I'm thinking that a smaller water tube diameter with flow metered by ball valves, will actually give me a decent HX rate. I will have to transition from 2" to 3/4" and use my installed unions (previous pics) to interchange all these gizmos I'm making - (hey I'm semi-retired so I get to play with stuff).

Update : 10/30/14 - INstalled the hp water heater with the coil wrapped around the outside of a 2" pipe/insulated/ and throttled with BVs. Using R209, I have managed a 20 degree differential across the jacket at 4.5 amps. My electric 208V only gets 10 degrees at 12 /14 amps. Definitely gaining ground - my only issue now is the best placement for the outlet side. so far so good

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Last edited by vwhead77; 10-30-14 at 06:33 PM.. Reason: MOre Pics top add
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Old 10-18-14, 05:56 PM   #22
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Try it out but you won't need to reduce anything. It needs very low resistance and the flow rate is self limiting so no need to restrict it.

BTW, I assume you are a VW nut (?). Check out my avatar. Very few in North America.
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Old 10-18-14, 06:20 PM   #23
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Thanks for the input - and yes, I have had over 60 VWs in my 55 years- including '72 Ghia 'Vert, '68 Ghia 'Vert, 2X'67 Vans, 2 Synchros, 1 Thing, 1 Fastback, 3 Squarebacks, a few Bugs (oldest was 63) , a few Rabbits, a few Jettas, two diesel pick-ups, a couple of Golfs - etc. - Plus, I used to find them for cheap- fix 'em up, drive them a while and then sell them. I love your Pick up man - had ONE chance to buy one and the guy backed out - I'm jealous
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Old 10-18-14, 06:52 PM   #24
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Why insulate the center? The copper pipe will have a positive effect on the heat transfer. If you want to restrict the flow, just stuff the pipe with copper or stainless steel pot scrubbers.
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Old 10-18-14, 06:58 PM   #25
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The pipe needs to be somewhat clear bottom to top. LOW RESISTANCE to natural flow. It won't go fast anyway.

The LT is beast of a truck. Full 8'+ x almost 6' wide bed. It is now getting the a M-TDi from an 02 Jetta in it and then turned into a plug in hybrid.
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Old 10-18-14, 06:58 PM   #26
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I'm insulating the PVC 'jacket'- the HW is still in the 2" pipe with the discharge from the compressor on the outside - but I like the advice about restricting the flow with SS
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Old 10-19-14, 12:22 AM   #27
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Quote:
Originally Posted by Mikesolar View Post
The pipe needs to be somewhat clear bottom to top. LOW RESISTANCE to natural flow. It won't go fast anyway.

The LT is beast of a truck. Full 8'+ x almost 6' wide bed. It is now getting the a M-TDi from an 02 Jetta in it and then turned into a plug in hybrid.
OOhhhhh...I'm really jealous
now .. man .. thas so cool
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Old 10-23-14, 12:51 PM   #28
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Default Winding and winding

First congratulations!
I'm dying to know how you did such nicely wound coils!
I tried salt filled 3/8 copper around the outside of 1 1/2 copper but had only marginal luck with it.
Nice thing about that 2" copper is that you can run some 3/4 copper up the center of it and connect it to a solar panel if you want to expand this to a 2 heat source system.
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Old 10-23-14, 01:13 PM   #29
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Default fridge

what if you tapped into a nearby refrigerator. it would make the fridge much more efficient and direct the heat that would be released into the house into helping heat domestic hot water.
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Old 10-23-14, 03:24 PM   #30
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Quote:
Originally Posted by stevehull View Post
I am concerned about the material used to plug the holes where the copper tubing comes out. Time will tell.
I agree. I have never had good luck with epoxies long term, especially in warm environments. Perhaps I have not used the correct one.

What you need is a "bulkhead" type fitting. The only kind I have seen are for flared copper (not sure if they are rated for R410A pressure) and usually they "assume" that you have a flat (or at least somewhat flexible) wall that you are going through.

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