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From: Jim on 3 Jun 2010 18:02
Hello everyone,

I am trying to sort a list of temperatures to analyze a chillers operation.
The chiller turns on when the outside air temperature is 80, and turns off
when the outside air temperature is 70. I am trying to find the time when
the chiller is on (temperature was above 80 and didn't drop below 70) and the
temperature is between 70 and 75. All I need is excel to display a 1 if it
is on (and between 70-75) or 0 if off, because every 1 is a unit of time.

All the sorts I have tried are unable to look back and see if it was turned
on, because it may have been above 80 twenty cells ago and now is in the mid
70's.

Example of my problem is say I have the following temperatures, the second
column is what the chiller would be doing, and the third column is the
information I would want from the if statement:

78 off 0
74 off 0
75 off 0
82 on 0
80 on 0
74 on 1
75 on 0
69 off 0
75 off 0
81 on 0
74 on 1

You can see the chiller can be on or off at the same temperature value based
on what happened before. Also, the value I want between 70-75 depends on
whether it is on or off. Although I see now I could use
"If(AND(B1="on",A1<75,A1>70),1,0) would populate the C row. I just need help
creating the on/off row. Thanks for any help.

From: steve on 4 Jun 2010 04:31
in cell b1 you should manually enter "off"
then in cell b2 enter the formula

=IF(B1="off",IF(A2>=80,"on","off"),IF(A2<70,"off","on"))

And copy/fill that down as you need it.

Regards
Steve

"Jim" <Jim(a)discussions.microsoft.com> wrote in message
news:92495C82-45A5-42B9-8D40-496C243774BC(a)microsoft.com...
> Hello everyone,
>
> I am trying to sort a list of temperatures to analyze a chillers
> operation.
> The chiller turns on when the outside air temperature is 80, and turns off
> when the outside air temperature is 70. I am trying to find the time when
> the chiller is on (temperature was above 80 and didn't drop below 70) and
> the
> temperature is between 70 and 75. All I need is excel to display a 1 if it
> is on (and between 70-75) or 0 if off, because every 1 is a unit of time.
>
> All the sorts I have tried are unable to look back and see if it was
> turned
> on, because it may have been above 80 twenty cells ago and now is in the
> mid
> 70's.
>
> Example of my problem is say I have the following temperatures, the second
> column is what the chiller would be doing, and the third column is the
> information I would want from the if statement:
>
> 78 off 0
> 74 off 0
> 75 off 0
> 82 on 0
> 80 on 0
> 74 on 1
> 75 on 0
> 69 off 0
> 75 off 0
> 81 on 0
> 74 on 1
>
> You can see the chiller can be on or off at the same temperature value
> based
> on what happened before. Also, the value I want between 70-75 depends on
> whether it is on or off. Although I see now I could use
> "If(AND(B1="on",A1<75,A1>70),1,0) would populate the C row. I just need
> help
> creating the on/off row. Thanks for any help.
>


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