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Importance of matching evaporator to condenser?

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Importance of matching evaporator to condenser? Carla Fong 06-30-2008
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Posted by Carla Fong on June 30, 2008, 12:20 pm
Hi all -

I've scanned the newsgroup postings and still haven't found a definitive
answer to my question.

We have an old (1930's vintage) building with an existing hydronic
heating system that we want to add some cooling to.

This has a very low velocity air flow and big ducts to keep sound levels
low. (think 'movie theatre')

The output port of the fan is about 36x48 inches going into the heating
plenum chamber. We're thinking of putting a couple of 5-ton sized
evaporators at the fan outlet (these will have about the same area as
the fan outlet), but our problem is that this old building's electrical
system can only support 5 tons of compressor without a major wiring upgrade.

What would happen if we fed the two 5-ton evaporators with only 5 tons
of refrigeration? Would we still get the 60K btu of cooling distributed
over the two evaporators, or would this just be a major CF?

Thanks for any advice. Postings to the newsgroup would be preferred as
the reply-address is spamtrapped.

Carla
Ah, the good old days, when the terminals were dumb and the users were
smart....

Posted by KJPRO on June 30, 2008, 12:31 pm

> Hi all -
>
> I've scanned the newsgroup postings and still haven't found a definitive
> answer to my question.
>
> We have an old (1930's vintage) building with an existing hydronic heating
> system that we want to add some cooling to.
>
> This has a very low velocity air flow and big ducts to keep sound levels
> low. (think 'movie theatre')
>
> The output port of the fan is about 36x48 inches going into the heating
> plenum chamber. We're thinking of putting a couple of 5-ton sized
> evaporators at the fan outlet (these will have about the same area as the
> fan outlet), but our problem is that this old building's electrical system
> can only support 5 tons of compressor without a major wiring upgrade.
>
> What would happen if we fed the two 5-ton evaporators with only 5 tons of
> refrigeration? Would we still get the 60K btu of cooling distributed over
> the two evaporators, or would this just be a major CF?
>
> Thanks for any advice. Postings to the newsgroup would be preferred as the
> reply-address is spamtrapped.
>
> Carla
> Ah, the good old days, when the terminals were dumb and the users were
> smart....


Major CF



Posted by on June 30, 2008, 12:41 pm
wrote:

>
>> Hi all -
>>
>> I've scanned the newsgroup postings and still haven't found a definitive
>> answer to my question.
>>
>> We have an old (1930's vintage) building with an existing hydronic heating
>> system that we want to add some cooling to.
>>
>> This has a very low velocity air flow and big ducts to keep sound levels
>> low. (think 'movie theatre')
>>
>> The output port of the fan is about 36x48 inches going into the heating
>> plenum chamber. We're thinking of putting a couple of 5-ton sized
>> evaporators at the fan outlet (these will have about the same area as the
>> fan outlet), but our problem is that this old building's electrical system
>> can only support 5 tons of compressor without a major wiring upgrade.
>>
>> What would happen if we fed the two 5-ton evaporators with only 5 tons of
>> refrigeration? Would we still get the 60K btu of cooling distributed over
>> the two evaporators, or would this just be a major CF?
>>
>> Thanks for any advice. Postings to the newsgroup would be preferred as the
>> reply-address is spamtrapped.
>>
>> Carla
>> Ah, the good old days, when the terminals were dumb and the users were
>> smart....
>
>
>Major CF
>

        General CF.

        Sorry to have to pull rank on you .....

        Of course, if she does it in her own home it would be a
Private CF.



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Posted by -zero on June 30, 2008, 9:13 pm

> Hi all -
>
> I've scanned the newsgroup postings and still haven't found a definitive
> answer to my question.
>
<snip>
> of refrigeration? Would we still get the 60K btu of cooling distributed
> over the two evaporators, or would this just be a major CF?


Hopeless CF.

-zero



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