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Dear trnsys
users, I’m having
a little bit of trouble with the non standard type 170 (or the update version
of it, type 370) to model a wood/gas boiler (in trnsys 15 build 3.0.0.26) My heating system
simulation use 2 large boilers, one running on gas and the other on wood. So I
included 2 type 170’s in my project, one to simulate the large gas fired
burner (mode 2) and one smaller wood fired unit (mode 4). But looking at the
output of these two burners it shows that when ever a gas fired burner is
present in the project, the internal calculation of the consumption of wood
(OUT(16): Mpkt_Br in [kg/h]) in the wood burner unit uses the calorific value
for gas (35 MJ/m3) instead of the calorific value of wood (about 18.5 MJ/kg). Thus
resulting in wood consumption which is to low. When I set both burners to wood
(PAR(2),BSTRO = 4) the internal calculation of the needed wood [kg/h] seems
correct (comparing it to OUT(6),Phumax). Is there a
workaround for this problem (setting a different logical unit for both burners,
although there is no parameter for this in type 170)? Best Regards, Raf |