[TRNSYS-users] night free cooling

Wed Jan 6 03:04:28 PST 2021

 Ciao,si sono Italiano.Io ho pensato di fare in questo modo con un equazione.Creo un comando di accensione del free cooling: Free_cooling = GE*(T_amb,18) in questo modo stabilisco un segnale di accensione del free cooling per temperature esterne maggiori di 18°C.Poi regolo la portata d'aria in questo modo: portata= (profilo_aria*Free_cooling*GE(T_amb,24) + 0.6*LE(T_amb,24))* C_season. In questo modo faccio si che quando il free cooling può essere utile, se la temperatura esterna è maggiore di 24 gradi allora parte mentre se è minore no. Con 24 indico la temperatura interna all'edifico di confort abbassata di 2°C .Può andare?Perchè mi serve un vincolo sulla minima temperatura esterna al di sotto della quale non voglio free colling ed un vincolo che mi dica quando serve davvero attivarlo ( quindi temperatura esterna maggiore di 24 gradi).Grazie e cordiali saluti.
Angeli FIlippo

    Il mercoledì 6 gennaio 2021, 09:07:46 CET, Toni Calabrese via TRNSYS-users <trnsys-users at lists.onebuilding.org> ha scritto:  

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Hallo Filippo,

I suppose that you are Italian. In case let me know and I will write you in Italian.

If you want to model the night cooling, you can follow two approaches:

1.     You could use Type 2 (controller) in order to get 1 in case the external temperature is lower than a certain value

2.     You could use an equation. Please have a look in the EQUATION Statement and you can learn how to set an equation with the function "GT" or "LT".

You can follow the first or the second approach depending on your experience with TRNSYS. Maybe it would be easier for you to start with the second approach.

I hope I helped you

Toni Calabrese, MSc.

Wissenschaftlicher Projektmitarbeiter

toni.calabrese at spf.ch |toni.calabrese at ost.ch

T +41 58 257 4827

SPF Institut für Solartechnik

OST – Ostschweizer Fachhochschule

Oberseestr. 10 | CH-8640 Rapperswil | Switzerland |www.spf.ch | www.ost.ch

OST – Ostschweizer Fachhochschule ist der Zusammenschluss aus FHS St.Gallen, HSR Rapperswil und NTB Buchs.

From: TRNSYS-users <trnsys-users-bounces at lists.onebuilding.org>On Behalf Of Filippo Angeli via TRNSYS-users
Sent: Tuesday, January 5, 2021 8:25 PM
To: trnsys-users at lists.onebuilding.org
Cc: Filippo Angeli <filippoangeli24 at yahoo.it>
Subject: [TRNSYS-users] night free cooling

Good evening, I want to include night free cooling in my building during the summer season.How can I build a function that regulates the night ventilation air flow rate, so that free cooling occurs when I have an external temperature greater than 15 ° C? Furthermore, I want night free cooling to occur only in certain external temperature conditions (for example greater than 24 ° C).Thanks a lot.

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