Brock
Advanced Member
Posts:599
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| 01 Jun 2008 11:03 AM |
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I have a 40 gallon electric tank (not wired up) as our preheat tank connected to the desuper heater on the geo unit. It then flows in to the main natural gas 40 gallon tank, then the house. What is the best way to plumb the first tank?
Initially then had the water entering through the drain at the bottom and drawing water out through the cold fill line. That seemed odd so I asked about it, so they reversed them and now it is drawing water out of the bottom of the tank and returning it back to the cold fill line.
Wouldn't it make more since to draw the water out of the bottom of the drain line (the way it is now) and return it in the hot out line? I would think that would force it to fill the entire tank with warm water before it hit the drain out the bottom to run back to the desuper heater. The draw back I can see is when actually drawing water with the desuper heater running it would pull that water first instead of any warm water that might be at the top of the tank.
Or am I over thinking this since the water is circulated anyway?
Now I see why I should get an 80 gallon pre tank, but I had the 40 gallon already. |
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| Green Bay, WI. - 4 ton horizontal goethermal, 16k gallon indoor pool, 3kw solar PV setup, 2 ton air to air HP, 3400 sq ft |
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Palace Geothermal
Veteran Member
Posts:1609
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| 01 Jun 2008 11:34 AM |
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 Attachment: HWG Diagram.pdf
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Dewayne Dean
<br>www.PalaceGeothermal.com<br>Why settle for 90% when you can have 400%<br>We heat and cool with dirt!<br>visit- http://welserver.com/WEL0114/- to see my system |
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Brock
Advanced Member
Posts:599
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| 01 Jun 2008 11:53 AM |
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Looks like they plumbed it the way it is in the drawing. I am just over thinking it. |
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| Green Bay, WI. - 4 ton horizontal goethermal, 16k gallon indoor pool, 3kw solar PV setup, 2 ton air to air HP, 3400 sq ft |
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DrGhia
New Member
Posts:15
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| 02 Jun 2008 08:59 AM |
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Brock,
If you don't mind my asking, what is the "small solar set up" that you reference?
Thanks
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Brock
Advanced Member
Posts:599
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| 02 Jun 2008 10:40 AM |
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It consists of 5 Kyocera KC125's for a total of 625w, they feed an Outback MX60 at about 120v, which in turn charges eight Deka 8A/8D sized batteries wired for 48vdc out at about 20 kw of battery, which in turns feeds a grid tied Xantrex XW6048, 6000w at 240vac out with and input of 48vdc from the battery bank . The inverter is tied to my sub panel on one side and my main panel on the grid side. in the event of a power failure the inverter disconnects from the grid and shut off that side but continues to power the downstream loads in our sub panel. I hope to continue to add panels as $ allows since the rest of my system is greatly oversized for the array size. I have some more info on it here.
http://www.uwgb.edu/nevermab/solar.htm
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| Green Bay, WI. - 4 ton horizontal goethermal, 16k gallon indoor pool, 3kw solar PV setup, 2 ton air to air HP, 3400 sq ft |
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engineer
Veteran Member
Posts:2749
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| 02 Jun 2008 11:59 AM |
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Waterfurnace recommends the same connections as ClimateMaster as shown in Dean's attachment.
Basically you want the desuperheater inlet to be the coldest water for maximum heat transfer, and you want the warmest possible water flowing from the preheat tank to the main tank.
The desuper (in the case of my installation and according to WF's docs) only raises water temp by 10-15 degrees each time it passes through.
In the case of my setup, I get a good warm tank of preheat water (~90-100 or so) only after the heat pump has run several hours, giving the water 2-3 passes through the desuper. I have an 80 gallon preheat tank on a 3 ton heat pump which so far has run only on low stage, so preheat takes awhile.
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Curt Kinder <br><br>
The truth is incontrovertible. Malice may attack it, ignorance may deride it, but in the end, there it is - Winston Churchill <br><br><a href="http://www.greenersolutionsair.com">www.greenersolutionsair.com</a>
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Brock
Advanced Member
Posts:599
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| 02 Jun 2008 12:14 PM |
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I have noticed after a day of not running during on peak or expensive electricity hours the pre heat tank will be about 70F (after a couple of showers(4 kids)). It takes about three hours of running to get it up to about 130F again, which is what the geo unit does when it switches back on in the off peak times and brings the pool back up to temp. The pool drops about .5F during the day. After about three hours the preheat tank temp slowly rises and about that time the heat pump usually shuts off because the pool is back up to temp. Do heat pumps normally have a cut off point for the desuperheater or do they just run whenever the heat pump is on? I ask because I have a thermometer on the water leaving the preheat tank and It says it's max temp was 141. I am not complaining because the main tank is set for 115 or so, but I didn’t know it would get that warm. Did I mention I wish I had an 80 gallon pre heat tank :) |
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| Green Bay, WI. - 4 ton horizontal goethermal, 16k gallon indoor pool, 3kw solar PV setup, 2 ton air to air HP, 3400 sq ft |
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engineer
Veteran Member
Posts:2749
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| 02 Jun 2008 12:26 PM |
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My WF literature says desuper gets locked out at an inlet water temp of 130, as a safety precaution against overheating domestic hot water.
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Curt Kinder <br><br>
The truth is incontrovertible. Malice may attack it, ignorance may deride it, but in the end, there it is - Winston Churchill <br><br><a href="http://www.greenersolutionsair.com">www.greenersolutionsair.com</a>
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