Has anyone considered using rainwater collection for roof evaporativecooling to reduce cooling load/costs ?
 

Ive read some articles where people have collected rainwater pumped up
to the roof and fed into either 180 degree sprinklers, or, into PVC
piping with holes drilled in the sides to soak the roof thereby
drastically cooling the roof tiles, deck, and hence reducing cooling
load on the inside of the home. In order to maximize savings, a 12
vdc high head pump can be used which is fed off of a small solar
collector or DeepCell batteries (which are periodically recharged) .
One article says his water flow amounts to approx. 50 gallons in just
a couple of hours ; this would require a HUGE quantity of collected
rainwater in order to have it operate for a full day.

I suppose if one lived next to a lake , pond, or stream...it would be
more viable.

Comments ? Thanks.

Has anyone considered using rainwater collection for roofevapo...
 

Shouldn't have moved to Florida if you can't stand the heat.

Has anyone considered using rainwater collection for roofevapo...
 

On Jun 22, 5:25*pm, wrote:
* * Shouldn't have moved to Florida if you can't stand the heat. * * * * * * * * * * * * * * * * * * * * *

I never said i cant stand the heat , now did i ? Just looking for
ways to cut some expenses ; what was behind your snide comment ?
What brought that on ?

Has anyone considered using rainwater collection for roof evapo...
 

" wrote in message
...
On Jun 22, 5:25 pm, wrote:
Shouldn't have moved to Florida if you can't stand the heat.

I never said i cant stand the heat , now did i ? Just looking for
ways to cut some expenses ; what was behind your snide comment ?
What brought that on ?

he has two thumbs up his ass.

Has anyone considered using rainwater collection for roofevaporative cooling to reduce cooling load/costs ?
 

On Jun 22, 6:14*pm, " wrote:
Ive read some articles where people have collected rainwater pumped up
to the roof and fed into either 180 *degree sprinklers, or, into PVC
piping with holes drilled in the sides to soak the roof thereby
drastically cooling the roof tiles, deck, and hence reducing cooling
load on the inside of the home. *In order to maximize savings, *a 12
vdc high head pump can be used which is fed off of a small solar
collector or DeepCell batteries (which are periodically recharged) .
One article says his water flow amounts to approx. 50 gallons in just
a couple of hours ; this would require a HUGE quantity of collected
rainwater in order to have it operate for a full day.

I suppose if one lived next to a lake , pond, or stream...it would be
more viable.

Comments ? *Thanks.

Ive tried that but not with rain water. It works but keeping your roof
wet all the time is not a good idea.

Jimmie

Has anyone considered using rainwater collection for roofevaporative cooling to reduce cooling load/costs ?
 

On Jun 22, 6:14*pm, " wrote:
Ive read some articles where people have collected rainwater pumped up
to the roof and fed into either 180 *degree sprinklers, or, into PVC
piping with holes drilled in the sides to soak the roof thereby
drastically cooling the roof tiles, deck, and hence reducing cooling
load on the inside of the home. *In order to maximize savings, *a 12
vdc high head pump can be used which is fed off of a small solar
collector or DeepCell batteries (which are periodically recharged) .
One article says his water flow amounts to approx. 50 gallons in just
a couple of hours ; this would require a HUGE quantity of collected
rainwater in order to have it operate for a full day.

I suppose if one lived next to a lake , pond, or stream...it would be
more viable.

Comments ? *Thanks.

It's a wasteful way of getting evaporative cooling. The time, effort
and money would be better spent on better insulation, better attic
ventilation, solar film on the windows and having the correct amount
of solar shading (awnings and/or roof overhang) for your area.

R

Has anyone considered using rainwater collection for roofevaporative cooling to reduce cooling load/costs ?
 

On Jun 22, 6:14*pm, " wrote:
Ive read some articles where people have collected rainwater pumped up
to the roof and fed into either 180 *degree sprinklers, or, into PVC
piping with holes drilled in the sides to soak the roof thereby
drastically cooling the roof tiles, deck, and hence reducing cooling
load on the inside of the home. *In order to maximize savings, *a 12
vdc high head pump can be used which is fed off of a small solar
collector or DeepCell batteries (which are periodically recharged) .
One article says his water flow amounts to approx. 50 gallons in just
a couple of hours ; this would require a HUGE quantity of collected
rainwater in order to have it operate for a full day.

I suppose if one lived next to a lake , pond, or stream...it would be
more viable.

Comments ? *Thanks.

For some publicly funded grants for house, you get extra points for
things like rainwater control. They want you to keep the first 1" of
water or something like that for re-use. The re-use is generally for
watering plants or toilets or something like that. You also get
points for plants on roof, etc., to shed heat load.

Has anyone considered using rainwater collection for roof evaporative cooling to reduce cooling load/costs ?
 

JIMMIE wrote:
On Jun 22, 6:14 pm, " wrote:
Ive read some articles where people have collected rainwater pumped
up to the roof and fed into either 180 degree sprinklers, or, into
PVC piping with holes drilled in the sides to soak the roof thereby
drastically cooling the roof tiles, deck, and hence reducing cooling
load on the inside of the home. In order to maximize savings, a 12
vdc high head pump can be used which is fed off of a small solar
collector or DeepCell batteries (which are periodically recharged) .
One article says his water flow amounts to approx. 50 gallons in just
a couple of hours ; this would require a HUGE quantity of collected
rainwater in order to have it operate for a full day.

I suppose if one lived next to a lake , pond, or stream...it would be
more viable.

Comments ? Thanks.

Ive tried that but not with rain water. It works but keeping your roof
wet all the time is not a good idea.


It would be off at night...

Has anyone considered using rainwater collection for roof evaporative cooling to reduce cooling load/costs ?
 

RicodJour wrote:
On Jun 22, 6:14 pm, " wrote:
Ive read some articles where people have collected rainwater pumped
up to the roof and fed into either 180 degree sprinklers, or, into
PVC piping with holes drilled in the sides to soak the roof thereby
drastically cooling the roof tiles, deck, and hence reducing cooling
load on the inside of the home. In order to maximize savings, a 12
vdc high head pump can be used which is fed off of a small solar
collector or DeepCell batteries (which are periodically recharged) .
One article says his water flow amounts to approx. 50 gallons in just
a couple of hours ; this would require a HUGE quantity of collected
rainwater in order to have it operate for a full day.

I suppose if one lived next to a lake , pond, or stream...it would be
more viable.

Comments ? Thanks.

It's a wasteful way of getting evaporative cooling. The time, effort
and money would be better spent on better insulation, better attic
ventilation, solar film on the windows and having the correct amount
of solar shading (awnings and/or roof overhang) for your area.


Not evaporative cooling so much as transfering the heat from the roof to the
water and letting it drain away, taking the heat with it.

Has anyone considered using rainwater collection for roofevaporative cooling to reduce cooling load/costs ?
 

On Jun 22, 9:12*pm, "HeyBub" wrote:
RicodJour wrote:
On Jun 22, 6:14 pm, " wrote:
Ive read some articles where people have collected rainwater pumped
up to the roof and fed into either 180 degree sprinklers, or, into
PVC piping with holes drilled in the sides to soak the roof thereby
drastically cooling the roof tiles, deck, and hence reducing cooling
load on the inside of the home. In order to maximize savings, a 12
vdc high head pump can be used which is fed off of a small solar
collector or DeepCell batteries (which are periodically recharged) .
One article says his water flow amounts to approx. 50 gallons in just
a couple of hours ; this would require a HUGE quantity of collected
rainwater in order to have it operate for a full day.

I suppose if one lived next to a lake , pond, or stream...it would be
more viable.

Comments ? Thanks.

It's a wasteful way of getting evaporative cooling. *The time, effort
and money would be better spent on better insulation, better attic
ventilation, solar film on the windows and having the correct amount
of solar shading (awnings and/or roof overhang) for your area.

Not evaporative cooling so much as transfering the heat from the roof to the
water and letting it drain away, taking the heat with it.- Hide quoted text -

- Show quoted text -

I would use the water to help the compressor run cooler by dripping
the water across the condensor coils. That way there is no need to
pump the water up. The only drawback is that you would have to clean
out the condensor coils once a year to get rid of any build-up. It
could be done with a 120 Volt solenoid from an old wahing machine,
Just put it in parallel with the condensor fan motor, also usually 120
V. That way the water only drips out when the fan motor is running.

Has anyone considered using rainwater collection for roof evaporativecooling to reduce cooling load/costs ?
 

Has anyone considered using rainwater collection for roof evaporativecooling to reduce cooling load/costs ?
 

hr(bob) wrote:
On Jun 22, 9:12 pm, "HeyBub" wrote:
RicodJour wrote:
On Jun 22, 6:14 pm, " wrote:
Ive read some articles where people have collected rainwater pumped
up to the roof and fed into either 180 degree sprinklers, or, into
PVC piping with holes drilled in the sides to soak the roof thereby
drastically cooling the roof tiles, deck, and hence reducing cooling
load on the inside of the home. In order to maximize savings, a 12
vdc high head pump can be used which is fed off of a small solar
collector or DeepCell batteries (which are periodically recharged) .
One article says his water flow amounts to approx. 50 gallons in just
a couple of hours ; this would require a HUGE quantity of collected
rainwater in order to have it operate for a full day.
I suppose if one lived next to a lake , pond, or stream...it would be
more viable.
Comments ? Thanks.
It's a wasteful way of getting evaporative cooling. The time, effort
and money would be better spent on better insulation, better attic
ventilation, solar film on the windows and having the correct amount
of solar shading (awnings and/or roof overhang) for your area.
Not evaporative cooling so much as transfering the heat from the roof to the
water and letting it drain away, taking the heat with it.- Hide quoted text -

- Show quoted text -

I would use the water to help the compressor run cooler by dripping
the water across the condensor coils. That way there is no need to
pump the water up. The only drawback is that you would have to clean
out the condensor coils once a year to get rid of any build-up. It
could be done with a 120 Volt solenoid from an old wahing machine,
Just put it in parallel with the condensor fan motor, also usually 120
V. That way the water only drips out when the fan motor is running.

You'd be better off using a flat plate stainless steel
heat exchanger because I will bet the rain water will
eat away the aluminum fins of the condenser unless it
is treated. A rain shower isn't going to bother an air
conditioner condenser but a constant spray or drip will,
unless it is designed for it. I've seen coils eat up
when a fellow decided to install a water spray system
on his air conditioners. I had a customer who owned a
restaurant who wanted a water spray on his condensing
units so I asked the manufacturer and it was not recommended.
The city water in my area would cause lime deposits very
quickly and the rain water is acidic. The HVAC supply
houses around here sell these heat exchangers:

http://www.flatplate.com/

TDD

Has anyone considered using rainwater collection for roof evaporativecooling to reduce cooling load/costs ?
 

Has anyone considered using rainwater collection for roofevaporative cooling to reduce cooling load/costs ?
 

On Jun 22, 9:58*pm, "hr(bob) "
wrote:
On Jun 22, 9:12*pm, "HeyBub" wrote:





RicodJour wrote:
On Jun 22, 6:14 pm, " wrote:
Ive read some articles where people have collected rainwater pumped
up to the roof and fed into either 180 degree sprinklers, or, into
PVC piping with holes drilled in the sides to soak the roof thereby
drastically cooling the roof tiles, deck, and hence reducing cooling
load on the inside of the home. In order to maximize savings, a 12
vdc high head pump can be used which is fed off of a small solar
collector or DeepCell batteries (which are periodically recharged) .
One article says his water flow amounts to approx. 50 gallons in just
a couple of hours ; this would require a HUGE quantity of collected
rainwater in order to have it operate for a full day.

I suppose if one lived next to a lake , pond, or stream...it would be
more viable.

Comments ? Thanks.

It's a wasteful way of getting evaporative cooling. *The time, effort
and money would be better spent on better insulation, better attic
ventilation, solar film on the windows and having the correct amount
of solar shading (awnings and/or roof overhang) for your area.

Not evaporative cooling so much as transfering the heat from the roof to the
water and letting it drain away, taking the heat with it.- Hide quoted text -

- Show quoted text -

I would use the water to help the compressor run cooler by dripping
nny the water across the condensor coils. *That way there is no need to
pump the water up. *The only drawback is that you would have to clean
out the condensor coils once a year to get rid of any build-up. *It
could be done with a 120 Volt solenoid from an old wahing machine,
Just put it in parallel with the condensor fan motor, also usually 120
V. *That way the water only drips out when the fan motor is running.- Hide quoted text -

- Show quoted text -

Funny you should bring this up, cause in extreme outdoor temps, i put
the hose on a fine spray and cover as much of the condensor coil as
possible...turning it into an evaporative condensor. I may hookup an
inline water filter to eliminate the sediment buildup issue. It does
drop the amps when water is being sprayed on it. I like your idea of
having a solenoid valve open when the a/c turns on ...and if i had the
rainwater collection barrel on my deck which is 2' higher than the a/c
unit on the ground...then the water would drain by gravity. Should I
opt to have the water go into 90 or 180 degree sprinkler heads to
diffuse the water ??? Would the gravity pressure be adequate ?
Again...filtering would be a requirement. Thanks much !

Has anyone considered using rainwater collection for roofevaporative cooling to reduce cooling load/costs ?
 

On Jun 23, 10:32*am, "
wrote:
On Jun 22, 9:58*pm, "hr(bob) "
wrote:





On Jun 22, 9:12*pm, "HeyBub" wrote:

RicodJour wrote:
On Jun 22, 6:14 pm, " wrote:
Ive read some articles where people have collected rainwater pumped
up to the roof and fed into either 180 degree sprinklers, or, into
PVC piping with holes drilled in the sides to soak the roof thereby
drastically cooling the roof tiles, deck, and hence reducing cooling
load on the inside of the home. In order to maximize savings, a 12
vdc high head pump can be used which is fed off of a small solar
collector or DeepCell batteries (which are periodically recharged)

Has anyone considered using rainwater collection for roof evaporative cooling to reduce cooling load/costs ?
 

I think he means the only losses would be evaporation losses as flow would be back into gutter which is your collection point, this would only be effective in dry heat areas though as the heat transfer is mostly into the air through evaporation, which in humid areas is minimal. Best bet is good insulation, light coloured roof, and ventilated eaves with whirlybird type ventilation near peak of your roof

--
For full context, visit https://www.homeownershub.com/mainte...ev-379934-.htm

Has anyone considered using rainwater collection for roofevaporative cooling to reduce cooling load/costs ?
 

On 4/1/2021 9:01 PM, Duffman wrote:
I think he means the only losses would be evaporation losses as flow
would be back into gutter which is your collection point, this would
only be effective in dry heat areas though as theÂ* heat transfer is
mostly into the air through evaporation, which in humid areas is
minimal.Â* Best bet is good insulation, light coloured roof, and
ventilated eaves with whirlybird type ventilation near peak of your roof


After 11 years, finally an answer. In places it would work, they don't
get much rain.