[TRNSYS-users] Type 335 AHU, problem with air conditioning modes

[Markus Gratzl]

Dear TRNSYS users,
I've got a problem with TESS-Type 335: Manual says, that conditioning 
modes are selected by comparing T_SA,set and T_mixed (see manual 5.7.1 
and 5.7.2). In my modell (see attachement) the comparison seemes to 
refer on T_SA,set and T_OA (instead of T_mixed), so that cooling mode is 
off when T_OA < T_SA,set. As a result T_SA,set is set as T_mixed (no 
cooling) instead of defined T_SUPP from equation (in may modell).

Heating and Cooling Power (Q_ht,HC and Q_cl,CC) refer to T_SUPP like 
described in manual, but air temperature from AHU to room (relevant 
output value) is wrong I would say.

If conditioning mode ist changed from 2 (cooling) to 3 (heating + 
cooling), this problem doesn't appear any longer.

Kind regards,
Markus Gratzl

-- 
ingenieurbüro gratzl e.u.
markus gratzl-michlmair
dipl.-ing. dr. techn.

ingenieurbüro (beratende ingenieure) für bauphysik
reischau 5 | a-4715 taufkirchen a.d. tr.
tel +43 7733 50281 | mobil +43 664 5131642
markus.gratzl at gratzl.co.at | http://energie.gratzl.co.at/
uid-nr atu 66951845 | FN 380717 d
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