[TRNSYS-users] heat exchangere

[e.nicolazzi at libero.it]

Dear Transys-user,

I'm simulating, with trnsys 16, a plate heat exchanger for district heating 
substation. I'm using type 5b, is it correct?
There's a control unit that in function of external temperature and the hot-
side outlet temperature (secondary pipe) open or close (%) the valve in the hot-
side inlet temperature (primary pipe). 
Can someone tell me how can i model a control unit? which types can i use? 

Thanks in advance,
Elly