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Re: [TRNSYS-users] TRNSYS-users Digest, Vol 29, Issue 15



Dear Samuele,

Try an equation with boolean algebra:

signal=(gt((temp1-temp2),2))*(lt((temp1-temp2),10))

gt(X,Y) means "greater than" and gives You a "1" whenever the value X (here "temp1-temp2) is greater than the Y-value (here "2").
lt(X,Y) works analogue, it is "less than"

Best regards,
Jochen

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Today's Topics:

   1. Request (Samuele)
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Betreff:
[TRNSYS-users] Request
Von:
"Samuele" <ozzysam@hotmail.com>
Datum:
Sun, 6 May 2007 16:19:29 +0200
An:
<trnsys-users@engr.wisc.edu>

An:
<trnsys-users@engr.wisc.edu>


Dear All,

I must control the input control signal of a pump so that it works if  the difference between temperature_1 and temperature_2 is:

                             temperature_1 - temperature_2 > 2°C

                             temperature_1 - temperature_2 < 10°C

Could anybody tell me what type can help me?

Thanks in advance.


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--
Dipl.-Ing. (FH) Jochen Döll

Dept. Thermal Systems and Buildings

Fraunhofer-Institut für Solare Energiesysteme ISE
Heidenhofstrasse 2, 79110 Freiburg, Germany

Phone:	+49 (761) 4588 5456
Mail:	jochen.doell@ise.fraunhofer.de
Web:	www.ise.fraunhofer.de