Re: [TRNSYS-users] Equation and Type 20

[Baboo Gowreesunker <Baboo.Gowreesunker@brunel.ac.uk>]

Tobias for no.1.

 

A primitive way of doing this is in Equation-Editor:

 

let x = PV-power

 

first = GT(x,1.5)*LT(x,3)

second = GT(x,3)*LT(x,4.5)

third = GT(x,4.5)

 

heating_rate = (1.5*first)+(3*second)+(4.5*third)

You should be able to pass the 'heating_rate' to other types

 

I don't know about no. 2.

 

Regards

Lesh 

 

 

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From: Tobias Tag [tag.tobias@googlemail.com]
Sent: 17 June 2013 09:53
To: TRNSYS-users@cae.wisc.edu
Subject: [TRNSYS-users] Equation and Type 20

Dear TRNSYS-User,

i have two problems with TRNSYS 17.

1. I´m trying to make the maximum heating rate of an element (of Type 60c)  depending on the power produced by PV in three steps. Shold look like that:

 
    If 1.5kW < PV-Power < 3kW  then heating rate = 1.5 kW

    else if 3kW < PV-Power < 4.5kW then heating rate = 3kW
   
    else if PV-Power > 4.5kW then heating rate = 4.5kW


I´ve set the heating rate as a String variable which shold get the value from a equation. but i don´t know how to update the equation in every time step of the simulation.

2. Does anybody know what the external files of type 20 (dual source heat pump) are? Unfortunatly ther is no example in the TRNSYS-Examples folder.


Kind regards

Tobias