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Home > Archive > Heating and air conditioning > October 2005 > flow rate of chilled water coils
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| Author |
flow rate of chilled water coils
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| Victor H Plank 2005-10-22, 12:21 pm |
| Hi guys and gals:
Does anyone have a rule of thumb for flow rate thru chilled water coils. I
know or think I know that cooling towers flow aprox 3 gal per ton. Is there
a similiar approx rate for chilled water?
Thanks
Vic
go ahead ask me about my grandtwins go ahead I dare ya
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| burner1941 2005-10-22, 1:21 pm |
| I was told years ago 3 and 3 gallon per minute, meaning same gallons on
both condenser and evaporator. So if this is correct for a water
chiller. The chilled water circulators that I've ran accross bears this
out too! I suppose you could transpose this to a coil, based on it's
tonnage rating.
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| ..p.jm@see_my_sig_for_address.com 2005-10-22, 1:21 pm |
| On 22 Oct 2005 08:30:36 -0700, "burner1941" <burner1941@wmconnect.com>
wrote:
>I was told years ago 3 and 3 gallon per minute, meaning same gallons on
>both condenser and evaporator. So if this is correct for a water
>chiller. The chilled water circulators that I've ran accross bears this
>out too! I suppose you could transpose this to a coil, based on it's
>tonnage rating.
It's unanswerable without specifying a coil delta, in terms of
enthalpy ( IE, must consider both latent and sensible ). WITH that,
it's a simple calculation.
It bears no relationship between indoor and outdoor coils, as
EVERY factor, even the basic heat transfer mechanism, is totally
different.
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| PrecisionMachinisT 2005-10-22, 1:21 pm |
|
"Victor H Plank" <poppyplank@comcast.net> wrote in message
news:272dneJ6pMBGy8feRVn-uA@comcast.com...
> Hi guys and gals:
>
> Does anyone have a rule of thumb for flow rate thru chilled water coils.
I
> know or think I know that cooling towers flow aprox 3 gal per ton. Is
there
> a similiar approx rate for chilled water?
>
Calculate flow from the btuh standpoint, using some desired target temp
delta between your entering and leaving water temp...1 gallon of water
weighing roughly 8.3 lbs IIRC
--
SVL
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| Victor H Plank 2005-10-22, 4:21 pm |
|
"burner1941" <burner1941@wmconnect.com> wrote in message
news:1129995036.492859.11390@o13g2000cwo.googlegroups.com...
> I was told years ago 3 and 3 gallon per minute, meaning same gallons on
> both condenser and evaporator. So if this is correct for a water
> chiller. The chilled water circulators that I've ran accross bears this
> out too! I suppose you could transpose this to a coil, based on it's
> tonnage rating.
Burner:
Thanks
Vic
>
| |
| Victor H Plank 2005-10-22, 4:21 pm |
|
>
> It's unanswerable without specifying a coil delta, in terms of
> enthalpy ( IE, must consider both latent and sensible ). WITH that,
> it's a simple calculation.
>
> It bears no relationship between indoor and outdoor coils, as
> EVERY factor, even the basic heat transfer mechanism, is totally
> different.
>
>
> Paul ( pjm @ pobox . com ) - remove spaces to email me
Paul:
I am working at the largest mall in Lancaster, PA.
I am converting 1.375 spaces to a Fuddruckers.
This is plan and spec work and the engineers have given no data for latent
or sensible and also no guide lines for pipe or control valve sizing.
Being a cheap son of a XXXXX I do not want to over size 2 way control
valves.
I dont mind oversizing pipe but with the cost of pnuematic valves and
actuators I would rather not buy a 2" valve when an 1 1/4" valve would have
the required CV
Vic
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| Victor H Plank 2005-10-22, 4:21 pm |
|
>
> Calculate flow from the btuh standpoint, using some desired target temp
> delta between your entering and leaving water temp...1 gallon of water
> weighing roughly 8.3 lbs IIRC
>
> --
>
> SVL
Sam:
Since I do not have this data (see missive to Paul) I cannot even judge what
load (either gain or loss) would be.
But you are correct given 2 of 3 you can calculate the third
Vic
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"Victor H Plank" <poppyplank@comcast.net> wrote in message
news:272dneJ6pMBGy8feRVn-uA@comcast.com...
Hi guys and gals:
Does anyone have a rule of thumb for flow rate thru chilled water coils. I
know or think I know that cooling towers flow aprox 3 gal per ton. Is there
a similiar approx rate for chilled water?
Thanks
Vic
go ahead ask me about my grandtwins go ahead I dare ya
This is ReRe
Depends on the type of HE. When I was designing for a chiller company, we
used brazed plates. Typical scenarios were 2.4 GPM / Ton. Bear in mind if
you want higher Delta T, you go slower. Be forewarned, slower flow requires
glycol or a salt to keep from icing up. 1.8 gpm / ton should be the minimum
without any protection. (insert sex comments here). Running on target at a
45 deg evap with 2.4 gpm / ton usually yields a 10 deg Delta.
ReRe
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| Victor H Plank 2005-10-25, 4:21 pm |
|
"ReRe" <blindeye (remove_this_crap_to_email) @insightbb.com> wrote in
message news:tMZ6f.271065$084.88912@attbi_s22...
>
> "Victor H Plank" <poppyplank@comcast.net> wrote in message
> news:272dneJ6pMBGy8feRVn-uA@comcast.com...
> Hi guys and gals:
>
> Does anyone have a rule of thumb for flow rate thru chilled water coils.
I
> know or think I know that cooling towers flow aprox 3 gal per ton. Is
there
> a similiar approx rate for chilled water?
>
> Thanks
> Vic
>
> go ahead ask me about my grandtwins go ahead I dare ya
>
>
>
>
> This is ReRe
>
> Depends on the type of HE. When I was designing for a chiller company, we
> used brazed plates. Typical scenarios were 2.4 GPM / Ton. Bear in mind if
> you want higher Delta T, you go slower. Be forewarned, slower flow
requires
> glycol or a salt to keep from icing up. 1.8 gpm / ton should be the
minimum
> without any protection. (insert sex comments here). Running on target at a
> 45 deg evap with 2.4 gpm / ton usually yields a 10 deg Delta.
>
> ReRe
Thanks ReRe at least I now have a range of flow.
Vic
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