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#1
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Grey water heat exchanger GFX
Anyone have any experience (purchasing or installing) a GFX greywater heat exchanger? Seems like a pretty neat concept but the retrofit details seem a bit troublesome for an exisitng home. Their website is a nightmare to understand / navigate.....they appear to have over 20 different models. A propane fired water heater makes for rather expensive hot water esp when the incomming water is ~40F so I have a $ motitvation. I might (easily) be able to capture the output of two showers but the third would require a pump. cheers Bob |
#2
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Grey water heat exchanger GFX
BobK207 wrote:
Anyone have any experience (purchasing or installing) a GFX greywater heat exchanger? I've been working on a different type... Seems like a pretty neat concept but the retrofit details seem a bit troublesome for an exisitng home. The height requirement can be a problem. Nick |
#3
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Grey water heat exchanger GFX
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#5
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Grey water heat exchanger GFX
Robert Gammon wrote:
wrote: BobK207 wrote: Anyone have any experience (purchasing or installing) a GFX greywater heat exchanger? I've been working on a different type... Seems like a pretty neat concept but the retrofit details seem a bit troublesome for an exisitng home. The height requirement can be a problem. Nick And in some cases, like here in southeast Texas, retrofit is nearly impossible!!! Land is ruler flat, and soil is so heavy with clay, we could make crude pottery with it!! Retrofit works when you have a basement with NO downstairs plumbing, Mom's house has a basement, clothes washer installed there. Good idea, GFX, but not easily adaptable to every situation. Also, I worry about heat loss in the pipe and asked the GFX tech people about insulating it. The rely was Nah, don't worry. The only consideration is that in cooler climates, unlike here, the cold water entering the coil can cause condensation. In that case, some insulation is desirable JUST to prevent condensation from building on the coils and dropping onto the floor. http://gfxtechnology.com/contents.html#selection The illustrations at the bottom of the page show this insulation (actually Sch 20 PVC pipe split, the rapped around the coils and strapped/tiewrapped/taped/glued in place). As DOE studies show, areas with colder water get better benefit as the GFX will raise temps of cold water better than warm water. Optimum case is to route GFX output to shower's cold side, AND to hot water tank/tankless This is only practical in new construction or a MAJOR bathroom remodel. |
#6
Posted to alt.home.repair,alt.building.construction,alt.energy.homepower,alt.solar.thermal
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Grey water heat exchanger GFX
If we pump 10 gpm at 100 F with 100 watts and heat 10 gpm from 55 to 95 F,
what's the net energy gain? If we pump for 1 minute and use 100/60 = 1.67 Wh and recover 10x8.33(95-55)/3.412 = 977 Wh, that's 586 times more energy. Nick |
#7
Posted to alt.home.repair,alt.building.construction
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Grey water heat exchanger GFX
wrote:
Robert Gammon wrote: wrote: BobK207 wrote: Anyone have any experience (purchasing or installing) a GFX greywater heat exchanger? I've been working on a different type... Seems like a pretty neat concept but the retrofit details seem a bit troublesome for an exisitng home. The height requirement can be a problem. And in some cases, like here in southeast Texas, retrofit is nearly impossible!!! Land is ruler flat, and soil is so heavy with clay, we could make crude pottery with it!! What do you do with warm greywater now? Do the same with cool greywater? Greywater/blackwater now get equal treatment, straight up tot he city sewer. Retrofit works when you have a basement with NO downstairs plumbing, Mom's house has a basement, clothes washer installed there. You might still reclaim heat from an upstairs shower, or add a pump. Some people say just stick to showers vs sinks and washing machines, since they are cleaner. If we pump 10 gpm at 100 F with 100 watts and heat 10 gpm from 55 to 95 F, what's the net energy gain? Single story home, so NO opportunity there. Good idea, GFX, but not easily adaptable to every situation. For slab type construction, with heavy clay soils, the easiest install is to dig a pit down to where the outgoing sewer can be intercepted, routed to a sewage ejector which pumps to the top of GFX (or your alternative exchanger). Waste water from heat exchanger then goes to sewer/septic tank. Seems like separating gray water from black water is impractical, EXCEPT in two cases. 1. New construction 2. Retro fit in a house with a basement and NO downstairs plumbing, i.e. you can easily identify and separate toilet drains form sink/shower drains. And I am coming to the conclusion that I should route the output of the heat exchanger to both shower cold taps and to the hot water heater. Water here is warm enough that I do not want to heat sink water, it then goes from 70sF degree water to high 80sF water. |
#8
Posted to alt.home.repair,alt.building.construction
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Grey water heat exchanger GFX
Robert Gammon wrote:
You might still reclaim heat from an upstairs shower, or add a pump... If we pump 10 gpm at 100 F with 100 watts and heat 10 gpm from 55 to 95 F, what's the net energy gain? 586:1 Single story home, so NO opportunity there. Why not? For slab type construction, with heavy clay soils, the easiest install is to dig a pit down to where the outgoing sewer can be intercepted, routed to a sewage ejector which pumps to the top of GFX (or your alternative exchanger)... .... which wouldn't need a pump. Seems like separating gray water from black water is impractical, EXCEPT in two cases. 1. New construction 2. Retro fit in a house with a basement and NO downstairs plumbing, i.e. you can easily identify and separate toilet drains form sink/shower drains. My house has a washing machine and pressure tank in the basement, but I can easily identify pipes from various fixtures under the open basement ceiling. ... I am coming to the conclusion that I should route the output of the heat exchanger to both shower cold taps and to the hot water heater. Or lower the water heater temp to the shower temp. Nick |
#9
Posted to alt.home.repair
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Grey water heat exchanger GFX
In Southern Arizona, water's the important resource.
The most successful rj |
#10
Posted to alt.home.repair
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Grey water heat exchanger GFX
Sorry about the incomplete post.
I hit SEND before the thought was complete..... In Southern Arizona, water's the important resource. Easiest, ( and most successful ) is to save washing machine water. Have the machine empty into a 55 gallon drum on the back porch. The simplest use is to use the water to drip-feed the garden. The more elaborate installations pump the water to an overhead holding tank. From there, it's gravity fed to the toilets, where it's used to "flush". rj |
#11
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Grey water heat exchanger GFX
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#12
Posted to alt.home.repair,alt.building.construction,alt.energy.homepower,alt.solar.thermal
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Grey water heat exchanger GFX
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#13
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Grey water heat exchanger GFX
Robert Gammon wrote:
Single story home, so NO opportunity there. Why not? See below, basements are not possible... Think harder :-) Nick |
#14
Posted to alt.home.repair,alt.building.construction,alt.energy.homepower,alt.solar.thermal
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Grey water heat exchanger GFX
wrote in message ... In alt.solar.thermal wrote: snip I have always thought that greywater should be plumbed separately anyway, allowing it to be used as desired for toilets and gardening. I think in some areas there are plumbing code issues. But I knew a retired engineer in Michigan that when he built his retirement home, he had black water and grey water drains separated. Ran the black water to a conventional septic system, and the greywater to a less involved drywell/drain field. After ten years, the septic system installer offered to open up the tank for the 'ten-year warranty' inspection. When they did, it was remarkably 'clean' in that it did not have much silt or other 'non-degradables' in the tank. Of course, the septic tank had a pretty low flow rate with just a retired couple and no greywater. I too have often thought this is a good idea. Especially when not on city mains sewage. daestrom |
#16
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Grey water heat exchanger GFX
Robert Gammon wrote:
The ONLY way to make a GFX work is to install pumps to small GFX units... Why use a GFX? Nick |
#17
Posted to alt.home.repair,alt.building.construction
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Grey water heat exchanger GFX
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#18
Posted to alt.home.repair,alt.building.construction
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Grey water heat exchanger GFX
-- Phil Scott Ideas are bullet proof. "BobK207" wrote in message oups.com... Anyone have any experience (purchasing or installing) a GFX greywater heat exchanger? Seems like a pretty neat concept but the retrofit details seem a bit troublesome for an exisitng home. Their website is a nightmare to understand / navigate.....they appear to have over 20 different models. A propane fired water heater makes for rather expensive hot water esp when the incomming water is ~40F so I have a $ motitvation. I might (easily) be able to capture the output of two showers but the third would require a pump. cheers Bob If those are easily cleanable heat exchangers it would be workable, if they are not easily cleaned (mechanically with a rod or scraping) grey water will end up fouling the thing..that would not be a good deal. Phil Scott |
#19
Posted to alt.home.repair,alt.building.construction
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Grey water heat exchanger GFX
Robert Gammon wrote:
wrote: Robert Gammon wrote: The ONLY way to make a GFX work is to install pumps to small GFX units... Why use a GFX? GFX or your version, Same problem... Wrong. Nick |
#21
Posted to alt.home.repair,alt.building.construction
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Grey water heat exchanger GFX
BobK207 wrote:
Phil Scott wrote: -- Phil Scott Ideas are bullet proof. "BobK207" wrote in message oups.com... Anyone have any experience (purchasing or installing) a GFX greywater heat exchanger? Seems like a pretty neat concept but the retrofit details seem a bit troublesome for an exisitng home. Their website is a nightmare to understand / navigate.....they appear to have over 20 different models. A propane fired water heater makes for rather expensive hot water esp when the incomming water is ~40F so I have a $ motitvation. I might (easily) be able to capture the output of two showers but the third would require a pump. cheers Bob If those are easily cleanable heat exchangers it would be workable, if they are not easily cleaned (mechanically with a rod or scraping) grey water will end up fouling the thing..that would not be a good deal. Phil Scott Having struggle through the info on GFX website, it looks like fouling (at least from what they say) is not a problem due to the very high flow velocity. As opposed to a "flooded" heat exchanger where flow velocity is much lower cheers Bob I concur, with a heat exchanger that never floods, the water velocity down the walls is VERY VERY rapid. Solids will tend to bump the sides infrequently as they fall thru the 3 to 6 foot length. GFX has documented installations that include blackwater processing that have been in continuous service for 5-9 years with NO clogging, no cleaning needed. Since the installation method uses clamps, it would then be easy to open one up after a few years to see what gunk is caked to the inside walls. But with the water velocity quoted, even a small about of residue that sticks when a solid bumps the wall will be quickly washed away by the rapidly flowing water |
#22
Posted to alt.home.repair,alt.building.construction
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Grey water heat exchanger GFX
Robert Gammon wrote:
... with a heat exchanger that never floods, the water velocity down the walls is VERY VERY rapid. And the efficiency is fairly low, especially with a bathtub. Nick |
#23
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Grey water heat exchanger GFX
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#24
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Grey water heat exchanger GFX
Robert Gammon wrote:
... with a heat exchanger that never floods, the water velocity down the walls is VERY VERY rapid. And the efficiency is fairly low, especially with a bathtub. And your heat exchanger does nothing to correct that either as BOTH require flowing warm waste water to do their work Wrong. Nick |
#25
Posted to alt.home.repair,alt.building.construction
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Grey water heat exchanger GFX
"BobK207" wrote in message oups.com... wrote: Robert Gammon wrote: wrote: Robert Gammon wrote: The ONLY way to make a GFX work is to install pumps to small GFX units... Why use a GFX? GFX or your version, Same problem... Wrong. Nick Guys- We're getting a little topic drift I was looking for someone with installation or specification experience w/ GFX product. Ask at the Wall. http://forums.invision.net/Main.cfm?CFApp=2 |
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