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temperature swing value Tony Sivori 04-15-2007
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Posted by =?ISO-8859-1?Q?Tekkie=AE?= on April 16, 2007, 8:42 pm
Jeffrey Lebowski wrote:
>> Programmable setback for heat may work ok
>> but for cooling it is useless!!!!!!!
>> Dido say that
>
> I bet your village misses you...
>
I bet you it doesn't...

Real Goods Solar, Inc.
Posted by CJT on April 16, 2007, 10:34 pm
Tony wrote:
<snip>
> Programmable setback for heat may work ok
> but for cooling it is useless!!!!!!!
<snip>

Nonsense. It's just as effective for cooling, and for the same reasons.

--
The e-mail address in our reply-to line is reversed in an attempt to
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Posted by on April 15, 2007, 9:48 pm

>Noon-Air wrote:
>>
>>>What is a typical number of degrees for the temperature swing for a
>>>programmable thermostat?
>>
>>
>> 1 degree
>
>... or less

        It's called 'deadband', and I call Bullshit on both answers.

        Anything less than 2 F, you're gonna get severe short cycling.

        By example - TotalLine programmables won't LET you set less
than 1, and the range is 1 - 6.


>>>Would adding three degrees save noticeably (say,
>>>five to ten percent) on the heat and cooling bill?
>>
>>
>> no

        Correct. Only lowering the setpoint in winter, raising it in
summer, will save money ( for whatever period of time during the day
the setpoint is closer to outside temps ).

>
>I don't know about 5-10%, but it might result in noticeable savings.
>
>>
>>
>>>--
>>>Tony Sivori
>>>
>>
>>
>>

--
Click here every day to feed an animal that needs you today !!!
http://www.theanimalrescuesite.com/

Paul ( pjm @ pobox . com ) - remove spaces to email me
'Some days, it's just not worth chewing through the restraints.'
'With sufficient thrust, pigs fly just fine.'
HVAC/R program for Palm PDA's
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Posted by CJT on April 15, 2007, 9:59 pm
.p.jm@see_my_sig_for_address.com wrote:

>
>
>>Noon-Air wrote:
>>
>>>
>>>
>>>>What is a typical number of degrees for the temperature swing for a
>>>>programmable thermostat?
>>>
>>>
>>>1 degree
>>
>>... or less
>
>
>         It's called 'deadband', and I call Bullshit on both answers.
>
>         Anything less than 2 F, you're gonna get severe short cycling.
>

I have observed the performance of mine, and it never varies enough
for the display to change (i.e. 1 degree). It also does not short
cycle.

>         By example - TotalLine programmables won't LET you set less
> than 1, and the range is 1 - 6.
>
>
>
>>>>Would adding three degrees save noticeably (say,
>>>>five to ten percent) on the heat and cooling bill?
>>>
>>>
>>>no
>
>
>         Correct. Only lowering the setpoint in winter, raising it in
> summer, will save money ( for whatever period of time during the day
> the setpoint is closer to outside temps ).
>

Read what he wrote. Three degrees is three degrees.

>
>>I don't know about 5-10%, but it might result in noticeable savings.
>>
>>
>>>
>>>>--
>>>>Tony Sivori
>>>>
>>>
>>>
>>>
>


--
The e-mail address in our reply-to line is reversed in an attempt to
minimize spam. Our true address is of the form che...@prodigy.net.

Posted by Noon-Air on April 15, 2007, 11:06 pm

>
>>Noon-Air wrote:
>>>
>>>>What is a typical number of degrees for the temperature swing for a
>>>>programmable thermostat?
>>>
>>>
>>> 1 degree
>>
>>... or less
>
> It's called 'deadband', and I call Bullshit on both answers.

Ummm.... no

> Anything less than 2 F, you're gonna get severe short cycling.

If the system is properly sized, 1 degree is reasonable and works just fine
and no short cycling unless you are within a degree or 2 of the design temp
limits. At that point, you may have the system cycle off for less than the 5
minute compressor delay-on-break timer, but it will run for 30 or 40 minutes
before it cycles off again.
If you have a short cycling problem with a 1 degree deadband under normal
usage, then your system is grossly oversized.

> By example - TotalLine programmables won't LET you set less
> than 1, and the range is 1 - 6.

I wouldn't ever go less than 1 degree, that would be counter productive.

>>>>Would adding three degrees save noticeably (say,
>>>>five to ten percent) on the heat and cooling bill?
>>>
>>>
>>> no
>
> Correct. Only lowering the setpoint in winter, raising it in
> summer, will save money ( for whatever period of time during the day
> the setpoint is closer to outside temps ).

I normally recommend that programmable stats be set in heat mode for 68 - 70
degrees during the day (6am - 10pm) and set back to 60 - 62 degrees at night
(10pm - 6am), and for A/C mode, 76 degrees 24hr.

>>I don't know about 5-10%, but it might result in noticeable savings.
>>
>>>
>>>
>>>>--
>>>>Tony Sivori
>>>>
>>>
>>>
>>>
>
> --
> Click here every day to feed an animal that needs you today !!!
> http://www.theanimalrescuesite.com/
>
> Paul ( pjm @ pobox . com ) - remove spaces to email me
> 'Some days, it's just not worth chewing through the restraints.'
> 'With sufficient thrust, pigs fly just fine.'
> HVAC/R program for Palm PDA's
> Free demo now available online http://pmilligan.net/palm/



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